[PATCH, GCC/ARM, 7/10] Clear all VFP regs inline in hardfloat nscall functions

The patch is fairly straightforward in its approach and consist of the
following 3 logical changes:
- abstract the number of floating-point register to clear in
  max_fp_regno
- use max_fp_regno to decide how many registers to clear so that the
  same code works for Armv8-M and Armv8.1-M Mainline
- emit vpush and vpop instruction respectively before and after a
  nonsecure call

Note that as in the patch to clear GPRs inline, debug information has to
be disabled for VPUSH and VPOP due to VPOP adding CFA adjustment note
for SP when R7 is sometimes used as CFA.

ChangeLog entries are as follows:

*** gcc/ChangeLog ***

2020-01-16  Mihail-Calin Ionescu  <mihail.ionescu@arm.com>
2020-01-16  Thomas Preud'homme  <thomas.preudhomme@arm.com>

* config/arm/arm.c (vfp_emit_fstmd): Declare early.
(arm_emit_vfp_multi_reg_pop): Likewise.
(cmse_nonsecure_call_inline_register_clear): Abstract number of VFP
registers to clear in max_fp_regno.  Emit VPUSH and VPOP to save and
restore callee-saved VFP registers.

*** gcc/testsuite/ChangeLog ***

2020-01-16  Mihail-Calin Ionescu  <mihail.ionescu@arm.com>
2020-01-16  Thomas Preud'homme  <thomas.preudhomme@arm.com>

* gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-13.c: Add check for
VPUSH and VPOP and update expectation for VSCCLRM.
* gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-7.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-8.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard/cmse-13.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard/cmse-7.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard/cmse-8.c: Likewise.

[PATCH, GCC/ARM, 6/10] Clear GPRs inline when calling nscall function

Besides changing the set of registers that needs to be cleared inline,
this patch also generates the push and pop to save and restore
callee-saved registers without trusting the callee inline. To make the
code more future-proof, this (currently) Armv8.1-M specific behavior is
expressed in terms of clearing of callee-saved registers rather than
directly based on the targets.

The patch contains 1 subtlety:

Debug information is disabled for push and pop because the
REG_CFA_RESTORE notes used to describe popping of registers do not stack.
Instead, they just reset the debug state for the register to the one at
the beginning of the function, which is incorrect for a register that is
pushed twice (in prologue and before nonsecure call) and then popped for
the first time. In particular, this occasionally trips CFI note creation
code when there are two codepaths to the epilogue, one of which does not
go through the nonsecure call. Obviously this mean that debugging
between the push and pop is not reliable.

*** gcc/ChangeLog ***

2020-01-16  Mihail-Calin Ionescu  <mihail.ionescu@arm.com>
2020-01-16  Thomas Preud'homme  <thomas.preudhomme@arm.com>

* config/arm/arm.c (arm_emit_multi_reg_pop): Declare early.
(cmse_nonsecure_call_clear_caller_saved): Rename into ...
(cmse_nonsecure_call_inline_register_clear): This.  Save and clear
callee-saved GPRs as well as clear ip register before doing a nonsecure
call then restore callee-saved GPRs after it when targeting
Armv8.1-M Mainline.
(arm_reorg): Adapt to function rename.

*** gcc/testsuite/ChangeLog ***

2020-01-16  Mihail-Calin Ionescu  <mihail.ionescu@arm.com>
2020-01-16  Thomas Preud'homme  <thomas.preudhomme@arm.com>

* gcc.target/arm/cmse/cmse-1.c: Add check for PUSH and POP and update
CLRM check.
* gcc.target/arm/cmse/cmse-14.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/bitfield-4.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/bitfield-5.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/bitfield-6.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/bitfield-7.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/bitfield-8.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/bitfield-9.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/bitfield-and-union.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-13.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-7.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-8.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard/cmse-13.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard/cmse-7.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard/cmse-8.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/soft/cmse-13.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/soft/cmse-7.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/soft/cmse-8.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/soft-sp/cmse-7.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/soft-sp/cmse-8.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/softfp/cmse-13.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/softfp/cmse-7.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/softfp/cmse-8.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/softfp/union-1.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/softfp/union-2.c: Likewise.

[PATCH, GCC/ARM, 5/10] Clear VFP registers with VSCCLRM

This patch adds a new pattern for the VSCCLRM instruction.
cmse_clear_registers () is then modified to use the new VSCCLRM
instruction when targeting Armv8.1-M Mainline, thus, making the Armv8-M
register clearing code specific to Armv8-M.

Since the VSCCLRM instruction mandates VPR in the register list, the
pattern is encoded with a parallel which only requires an unspecified
VUNSPEC_CLRM_VPR constant modelling the APSR clearing. Other expression
in the parallel are expected to be set expression for clearing the VFP
registers.

*** gcc/ChangeLog ***

2020-01-16  Mihail-Calin Ionescu  <mihail.ionescu@arm.com>
2020-01-16  Thomas Preud'homme  <thomas.preudhomme@arm.com>

* config/arm/arm-protos.h (clear_operation_p): Adapt prototype.
* config/arm/arm.c (clear_operation_p): Extend to be able to check a
clear_vfp_multiple pattern based on a new vfp parameter.
(cmse_clear_registers): Generate VSCCLRM to clear VFP registers when
targeting Armv8.1-M Mainline.
(cmse_nonsecure_entry_clear_before_return): Clear VFP registers
unconditionally when targeting Armv8.1-M Mainline architecture.  Check
whether VFP registers are available before looking call_used_regs for a
VFP register.
* config/arm/predicates.md (clear_multiple_operation): Adapt to change
of prototype of clear_operation_p.
(clear_vfp_multiple_operation): New predicate.
* config/arm/unspecs.md (VUNSPEC_VSCCLRM_VPR): New volatile unspec.
* config/arm/vfp.md (clear_vfp_multiple): New define_insn.

*** gcc/testsuite/ChangeLog ***

2020-01-16  Mihail-Calin Ionescu  <mihail.ionescu@arm.com>
2020-01-16  Thomas Preud'homme  <thomas.preudhomme@arm.com>

* gcc.target/arm/cmse/bitfield-1.c: Add check for VSCCLRM.
* gcc.target/arm/cmse/bitfield-2.c: Likewise.
* gcc.target/arm/cmse/bitfield-3.c: Likewise.
* gcc.target/arm/cmse/cmse-1.c: Likewise.
* gcc.target/arm/cmse/struct-1.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-13.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-5.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-7.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-8.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard/cmse-13.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard/cmse-5.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard/cmse-7.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard/cmse-8.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/soft/cmse-5.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/softfp-sp/cmse-5.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/softfp/cmse-5.c: Likewise.

[PATCH, GCC/ARM, 4/10] Clear GPR with CLRM

This patch adds a new pattern for the CLRM instruction and guards the
current clearing code in output_return_instruction() and thumb_exit()
on Armv8.1-M Mainline instructions not being present.
cmse_clear_registers () is then modified to use the new CLRM instruction
when targeting Armv8.1-M Mainline while keeping Armv8-M register
clearing code for VFP registers.

For the CLRM instruction, which does not mandated APSR in the register
list, checking whether it is the right volatile unspec or a clearing
register is done in clear_operation_p.

Note that load/store multiple were deemed sufficiently different in
terms of RTX structure compared to the CLRM pattern for a different
function to be used to validate the match_parallel.

ChangeLog entries are as follows:

*** gcc/ChangeLog ***

2020-01-16  Mihail-Calin Ionescu  <mihail.ionescu@arm.com>
2020-01-16  Thomas Preud'homme  <thomas.preudhomme@arm.com>

* config/arm/arm-protos.h (clear_operation_p): Declare.
* config/arm/arm.c (clear_operation_p): New function.
(cmse_clear_registers): Generate clear_multiple instruction pattern if
targeting Armv8.1-M Mainline or successor.
(output_return_instruction): Only output APSR register clearing if
Armv8.1-M Mainline instructions not available.
(thumb_exit): Likewise.
* config/arm/predicates.md (clear_multiple_operation): New predicate.
* config/arm/thumb2.md (clear_apsr): New define_insn.
(clear_multiple): Likewise.
* config/arm/unspecs.md (VUNSPEC_CLRM_APSR): New volatile unspec.

*** gcc/testsuite/ChangeLog ***

2020-01-16  Mihail-Calin Ionescu  <mihail.ionescu@arm.com>
2020-01-16  Thomas Preud'homme  <thomas.preudhomme@arm.com>

* gcc.target/arm/cmse/bitfield-1.c: Add check for CLRM.
* gcc.target/arm/cmse/bitfield-2.c: Likewise.
* gcc.target/arm/cmse/bitfield-3.c: Likewise.
* gcc.target/arm/cmse/struct-1.c: Likewise.
* gcc.target/arm/cmse/cmse-14.c: Likewise.
* gcc.target/arm/cmse/cmse-1.c: Likewise.  Restrict checks for Armv8-M
GPR clearing when CLRM is not available.
* gcc.target/arm/cmse/mainline/8_1m/bitfield-4.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/bitfield-5.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/bitfield-6.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/bitfield-7.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/bitfield-8.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/bitfield-9.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-13.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-5.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-7.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-8.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard/cmse-13.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard/cmse-5.c: likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard/cmse-7.c: likewise.
* gcc.target/arm/cmse/mainline/8_1m/hard/cmse-8.c: likewise.
* gcc.target/arm/cmse/mainline/8_1m/soft/cmse-13.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/soft/cmse-5.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/soft/cmse-7.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/soft/cmse-8.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/softfp-sp/cmse-5.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/softfp-sp/cmse-7.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/softfp-sp/cmse-8.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/softfp/cmse-13.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/softfp/cmse-5.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/softfp/cmse-7.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/softfp/cmse-8.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/union-1.c: Likewise.
* gcc.target/arm/cmse/mainline/8_1m/union-2.c: Likewise.

[PATCH, GCC/ARM, 3/10] Save/restore FPCXTNS in nsentry functions

This patch consists mainly of creating 2 new instruction patterns to
push and pop special FP registers via vldm and vstr and using them in
prologue and epilogue. The patterns are defined as push/pop with an
unspecified operation on the memory accessed, with an unspecified
constant indicating what special FP register is being saved/restored.

Other aspects of the patch include:
  * defining the set of special registers that can be saved/restored and
    their name
  * reserving space in the stack frames for these push/pop
  * preventing return via pop
  * guarding the clearing of FPSCR to target architecture not having
    Armv8.1-M Mainline instructions.

*** gcc/ChangeLog ***

2020-01-16  Mihail-Calin Ionescu  <mihail.ionescu@arm.com>
2020-01-16  Thomas Preud'homme  <thomas.preudhomme@arm.com>

* config/arm/arm.c (fp_sysreg_names): Declare and define.
(use_return_insn): Also return false for Armv8.1-M Mainline.
(output_return_instruction): Skip FPSCR clearing if Armv8.1-M
Mainline instructions are available.
(arm_compute_frame_layout): Allocate space in frame for FPCXTNS
when targeting Armv8.1-M Mainline Security Extensions.
(arm_expand_prologue): Save FPCXTNS if this is an Armv8.1-M
Mainline entry function.
(cmse_nonsecure_entry_clear_before_return): Clear IP and r4 if
targeting Armv8.1-M Mainline or successor.
(arm_expand_epilogue): Fix indentation of caller-saved register
clearing.  Restore FPCXTNS if this is an Armv8.1-M Mainline
entry function.
* config/arm/arm.h (TARGET_HAVE_FP_CMSE): New macro.
(FP_SYSREGS): Likewise.
(enum vfp_sysregs_encoding): Define enum.
(fp_sysreg_names): Declare.
* config/arm/unspecs.md (VUNSPEC_VSTR_VLDR): New volatile unspec.
* config/arm/vfp.md (push_fpsysreg_insn): New define_insn.
(pop_fpsysreg_insn): Likewise.

*** gcc/testsuite/Changelog ***

2020-01-16  Mihail-Calin Ionescu  <mihail.ionescu@arm.com>
2020-01-16  Thomas Preud'homme  <thomas.preudhomme@arm.com>

* gcc.target/arm/cmse/bitfield-1.c: add checks for VSTR and VLDR.
* gcc.target/arm/cmse/bitfield-2.c: Likewise.
* gcc.target/arm/cmse/bitfield-3.c: Likewise.
* gcc.target/arm/cmse/cmse-1.c: Likewise.
* gcc.target/arm/cmse/struct-1.c: Likewise.
* gcc.target/arm/cmse/cmse.exp: Run existing Armv8-M Mainline tests
from mainline/8m subdirectory and new Armv8.1-M Mainline tests from
mainline/8_1m subdirectory.
* gcc.target/arm/cmse/mainline/bitfield-4.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/bitfield-4.c: This.
* gcc.target/arm/cmse/mainline/bitfield-5.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/bitfield-5.c: This.
* gcc.target/arm/cmse/mainline/bitfield-6.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/bitfield-6.c: This.
* gcc.target/arm/cmse/mainline/bitfield-7.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/bitfield-7.c: This.
* gcc.target/arm/cmse/mainline/bitfield-8.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/bitfield-8.c: This.
* gcc.target/arm/cmse/mainline/bitfield-9.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/bitfield-9.c: This.
* gcc.target/arm/cmse/mainline/bitfield-and-union-1.c: Move and rename
into ...
* gcc.target/arm/cmse/mainline/8m/bitfield-and-union.c: This.
* gcc.target/arm/cmse/mainline/hard-sp/cmse-13.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/hard-sp/cmse-13.c: This.  Clean up
dg-skip-if directive for float ABI.
* gcc.target/arm/cmse/mainline/hard-sp/cmse-5.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/hard-sp/cmse-5.c: This.  Clean up
dg-skip-if directive for float ABI.
* gcc.target/arm/cmse/mainline/hard-sp/cmse-7.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/hard-sp/cmse-7.c: This.  Clean up
dg-skip-if directive for float ABI.
* gcc.target/arm/cmse/mainline/hard-sp/cmse-8.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/hard-sp/cmse-8.c: This.  Clean up
dg-skip-if directive for float ABI.
* gcc.target/arm/cmse/mainline/hard/cmse-13.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/hard/cmse-13.c: This.  Clean up
dg-skip-if directive for float ABI.
* gcc.target/arm/cmse/mainline/hard/cmse-5.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/hard/cmse-5.c: This.  Clean up
dg-skip-if directive for float ABI.
* gcc.target/arm/cmse/mainline/hard/cmse-7.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/hard/cmse-7.c: This.  Clean up
dg-skip-if directive for float ABI.
* gcc.target/arm/cmse/mainline/hard/cmse-8.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/hard/cmse-8.c: This.  Clean up
dg-skip-if directive for float ABI.
* gcc.target/arm/cmse/mainline/soft/cmse-13.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/soft/cmse-13.c: This.  Clean up
dg-skip-if directive for float ABI.
* gcc.target/arm/cmse/mainline/soft/cmse-5.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/soft/cmse-5.c: This.  Clean up
dg-skip-if directive for float ABI.
* gcc.target/arm/cmse/mainline/soft/cmse-7.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/soft/cmse-7.c: This.  Clean up
dg-skip-if directive for float ABI.
* gcc.target/arm/cmse/mainline/soft/cmse-8.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/soft/cmse-8.c: This.  Clean up
dg-skip-if directive for float ABI.
* gcc.target/arm/cmse/mainline/softfp-sp/cmse-5.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/softfp-sp/cmse-5.c: This.  Clean up
dg-skip-if directive for float ABI.
* gcc.target/arm/cmse/mainline/softfp-sp/cmse-7.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/softfp-sp/cmse-7.c: This.  Clean up
dg-skip-if directive for float ABI.
* gcc.target/arm/cmse/mainline/softfp-sp/cmse-8.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/softfp-sp/cmse-8.c: This.  Clean up
dg-skip-if directive for float ABI.
* gcc.target/arm/cmse/mainline/softfp/cmse-13.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/softfp/cmse-13.c: This.  Clean up
dg-skip-if directive for float ABI.
* gcc.target/arm/cmse/mainline/softfp/cmse-5.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/softfp/cmse-5.c: This.  Clean up
dg-skip-if directive for float ABI.
* gcc.target/arm/cmse/mainline/softfp/cmse-7.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/softfp/cmse-7.c: This.  Clean up
dg-skip-if directive for float ABI.
* gcc.target/arm/cmse/mainline/softfp/cmse-8.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/softfp/cmse-8.c: This.  Clean up
dg-skip-if directive for float ABI.
* gcc.target/arm/cmse/mainline/union-1.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/union-1.c: This.
* gcc.target/arm/cmse/mainline/union-2.c: Move into ...
* gcc.target/arm/cmse/mainline/8m/union-2.c: This.
* gcc.target/arm/cmse/mainline/8_1m/bitfield-4.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/bitfield-5.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/bitfield-6.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/bitfield-7.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/bitfield-8.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/bitfield-9.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/bitfield-and-union.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-13.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-5.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-7.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-8.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/hard/cmse-13.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/hard/cmse-5.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/hard/cmse-7.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/hard/cmse-8.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/soft/cmse-13.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/soft/cmse-5.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/soft/cmse-7.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/soft/cmse-8.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/softfp-sp/cmse-5.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/softfp-sp/cmse-7.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/softfp-sp/cmse-8.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/softfp/cmse-13.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/softfp/cmse-5.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/softfp/cmse-7.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/softfp/cmse-8.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/union-1.c: New file.
* gcc.target/arm/cmse/mainline/8_1m/union-2.c: New file.
* lib/target-supports.exp (check_effective_target_arm_cmse_clear_ok):
New procedure.

[PATCH, GCC/ARM, 2/10] Add command line support for Armv8.1-M Mainline

Besides the expected enabling of the new value for the -march
command-line option (-march=armv8.1-m.main) and its extensions (see
below), this patch disables support of the Security Extensions for this
newly added architecture. This is done both by not including the cmse
bit in the architecture description and by throwing an error message
when user request Armv8.1-M Mainline Security Extensions. Note that
Armv8-M Baseline and Mainline Security Extensions are still enabled.

Only extensions for already supported instructions are implemented in
this patch. Other extensions (MVE integer and float) will be added in
separate patches. The following configurations are allowed for Armv8.1-M
Mainline with regards to FPU and implemented in this patch:
+ no FPU (+nofp)
+ single precision VFPv5 with FP16 (+fp)
+ double precision VFPv5 with FP16 (+fp.dp)

ChangeLog entry are as follow:

*** gcc/ChangeLog ***

2020-01-16  Mihail-Calin Ionescu <mihail.ionescu@arm.com>
2020-01-16  Thomas Preud'homme <thomas.preudhomme@arm.com>

* config/arm/arm-cpus.in (armv8_1m_main): New feature.
(ARMv4, ARMv4t, ARMv5t, ARMv5te, ARMv5tej, ARMv6, ARMv6j, ARMv6k,
ARMv6z, ARMv6kz, ARMv6zk, ARMv6t2, ARMv6m, ARMv7, ARMv7a, ARMv7ve,
ARMv7r, ARMv7m, ARMv7em, ARMv8a, ARMv8_1a, ARMv8_2a, ARMv8_3a,
ARMv8_4a, ARMv8_5a, ARMv8m_base, ARMv8m_main, ARMv8r): Reindent.
(ARMv8_1m_main): New feature group.
(armv8.1-m.main): New architecture.
* config/arm/arm-tables.opt: Regenerate.
* config/arm/arm.c (arm_arch8_1m_main): Define and default initialize.
(arm_option_reconfigure_globals): Initialize arm_arch8_1m_main.
(arm_options_perform_arch_sanity_checks): Error out when targeting
Armv8.1-M Mainline Security Extensions.
* config/arm/arm.h (arm_arch8_1m_main): Declare.

*** gcc/testsuite/ChangeLog ***

2020-01-16  Mihail-Calin Ionescu <mihail.ionescu@arm.com>
2020-01-16  Thomas Preud'homme <thomas.preudhomme@arm.com>

* lib/target-supports.exp
(check_effective_target_arm_arch_v8_1m_main_ok): Define.
(add_options_for_arm_arch_v8_1m_main): Likewise.
(check_effective_target_arm_arch_v8_1m_main_multilib): Likewise.

[PATCH, GCC/ARM, 1/10] Fix -mcmse check in libgcc

This patch is part of a patch series to add support for Armv8.1-M
Mainline Security Extensions architecture.

Code to detect whether cmse.c can be buit with -mcmse checks the output
of host GCC when invoked with -mcmse. However, an error from the
compiler does not prevent some minimal output so this always holds true.

2020-01-16  Mihail-Calin Ionescu  <mihail.ionescu@arm.com>
2020-01-16  Thomas Preud'homme  <thomas.preudhomme@arm.com>

* config/arm/t-arm: Check return value of gcc rather than lack of
output.

gcc-git-customization.sh: Avoid double expansion

gcc-git-customization.sh: avoid double expansion

[GCC][PATCH][AArch64]Add ACLE intrinsics for bfdot for ARMv8.6 Extension

2020-01-16  Stam Markianos-Wright  <stam.markianos-wright@arm.com>

* config/aarch64/aarch64-simd-builtins.def (aarch64_bfdot,
aarch64_bfdot_lane, aarch64_bfdot_laneq): New.
* config/aarch64/aarch64-simd.md (aarch64_bfdot, aarch64_bfdot_lane,
aarch64_bfdot_laneq): New.
* config/aarch64/arm_bf16.h (vbfdot_f32, vbfdotq_f32,
vbfdot_lane_f32, vbfdotq_lane_f32, vbfdot_laneq_f32,
vbfdotq_laneq_f32): New.
* config/aarch64/iterators.md (UNSPEC_BFDOT, Vbfdottype,
VBFMLA_W, VBF): New.
(isquadop): Add V4BF, V8BF.

2020-01-16  Stam Markianos-Wright  <stam.markianos-wright@arm.com>

* gcc.target/aarch64/advsimd-intrinsics/bfdot-1.c: New.
* gcc.target/aarch64/advsimd-intrinsics/bfdot-2.c: New.
* gcc.target/aarch64/advsimd-intrinsics/bfdot-3.c: New.

libstdc++: Improve unordered containers == operator (PR 91263)

Avoid comparing elements with operator== multiple times by replacing
uses of find and equal_range with equivalent inlined code that uses
operator== instead of the container's equality comparison predicate.
This is valid because the standard requires that operator== is a
refinement of the equality predicate.

Also replace the _S_is_permutation function with std::is_permutation,
which wasn't yet implemented when this code was first written.

PR libstdc++/91263
* include/bits/hashtable.h (_Hashtable<>): Make _Equality<> friend.
* include/bits/hashtable_policy.h: Include <bits/stl_algo.h>.
(_Equality_base): Remove.
(_Equality<>::_M_equal): Review implementation. Use
std::is_permutation.
* testsuite/23_containers/unordered_multiset/operators/1.cc
(Hash, Equal, test02, test03): New.
* testsuite/23_containers/unordered_set/operators/1.cc
(Hash, Equal, test02, test03): New.

[GCC][PATCH][AArch64]Add ACLE intrinsics for dot product (usdot - vector, <us/su>dot - by element) for AArch64 AdvSIMD ARMv8.6 Extension

gcc/ChangeLog:

2020-01-16  Stam Markianos-Wright  <stam.markianos-wright@arm.com>

* config/aarch64/aarch64-builtins.c: (enum aarch64_type_qualifiers):
New qualifier_lane_quadtup_index, TYPES_TERNOP_SSUS,
TYPES_QUADOPSSUS_LANE_QUADTUP, TYPES_QUADOPSSSU_LANE_QUADTUP.
(aarch64_simd_expand_args): Add case SIMD_ARG_LANE_QUADTUP_INDEX.
(aarch64_simd_expand_builtin): Add qualifier_lane_quadtup_index.
* config/aarch64/aarch64-simd-builtins.def (usdot, usdot_lane,
usdot_laneq, sudot_lane,sudot_laneq): New.
* config/aarch64/aarch64-simd.md (aarch64_usdot): New.
(aarch64_<sur>dot_lane): New.
* config/aarch64/arm_neon.h (vusdot_s32): New.
(vusdotq_s32): New.
(vusdot_lane_s32): New.
(vsudot_lane_s32): New.
* config/aarch64/iterators.md (DOTPROD_I8MM): New iterator.
(UNSPEC_USDOT, UNSPEC_SUDOT): New unspecs.

gcc/testsuite/ChangeLog:

2020-01-16  Stam Markianos-Wright  <stam.markianos-wright@arm.com>

* gcc.target/aarch64/advsimd-intrinsics/vdot-compile-3-1.c: New test.
* gcc.target/aarch64/advsimd-intrinsics/vdot-compile-3-2.c: New test.
* gcc.target/aarch64/advsimd-intrinsics/vdot-compile-3-3.c: New test.
* gcc.target/aarch64/advsimd-intrinsics/vdot-compile-3-4.c: New test.

contrib: Check and if needed set user.name and user.email in gcc-git-customization.sh

As discussed on IRC, this adds a couple more checks in the
customization setup for git.  If the variables user.name and
user.email are not set anywhere in the git config hierarchy, we set
some local values.  We always ask about the values we detect and if
the user gives an answer that is new, we save that in the local
config: this gives the opportunity to use different values to those
configured for the global space.

Also cleaned up a couple of minor niggles, such as using $(cmd) rather
than `cmd` for subshells and some quoting issues when using eval.

* gcc-git-customization.sh: Check that user.name and user.email
are set.  Use $(cmd) instead of `cmd`.  Fix variable quoting when
using eval.

Fix spacing in a dump in value-prof.c.

* value-prof.c (dump_histogram_value): Fix
obvious spacing issue.

Fix value numbering dealing with reverse byte order

Hi,
  While working on bit-field lowering pass, I came across this bug.
The IR looks like:
  VIEW_CONVERT_EXPR<unsigned long>(var1) = _12;
  _1 = BIT_FIELD_REF <var1, 64, 0>;

Where the BIT_FIELD_REF has REF_REVERSE_STORAGE_ORDER set on it
and var1's type has TYPE_REVERSE_STORAGE_ORDER set on it.
PRE/FRE would decided to prop _12 into the BFR statement
which would produce wrong code.
And yes _12 has the correct byte order already; bit-field lowering
removes the implicit byte swaps in the IR and adds the explicity
to make it easier optimize later on.

This patch adds a check for storage_order_barrier_p on the lhs tree
which returns true in the case where we had a reverse order with a VCE.

ChangeLog:
* tree-ssa-sccvn.c(vn_reference_lookup_3): Check lhs for
!storage_order_barrier_p.

Uninitialized padding in struct _dep.

In struct _dep, there is an implicit padding of 4bits.  This
bit-field padding is uninitialized when init_dep_1 is being called.
This means we access uninitialized memory but never use it for
anything.  Adding an unused bit-field field and initializing it
in init_dep_1 will improve code generation also as we initialize
the whole 32bits now rather than just part of it.

ChangeLog:
* sched-int.h (_dep): Add unused bit-field field for the padding.
* sched-deps.c (init_dep_1): Init unused field.

Fix uninitialized field in expand_operand.

Commit g:f96bf49a0 added the target field to expand_operand.
But it leaves it uninitialized when doing a full initialization
inside create_expand_operand.  This fixes the problem and improves
the code generation inside create_expand_operand too.

ChangeLog:
* optabs.h (create_expand_operand): Initialize target field also.

contrib: Verify the id to be printed is ancestor of the corresponding remote release branch (or master), otherwise print nothing.

The monotonically increasing revision ids need to be globally unique, so they should
only identify commits that were committed to the upstream repo to its master or
releases/gcc-N branches.  The alias could print something even for private branches
or vendor branches etc., but if such an identifier is then used publicly, it will
refer to something else.

2020-01-16  Jakub Jelinek  <jakub@redhat.com>

* gcc-git-customization.sh: Verify the id to be printed is ancestor of
the corresponding remote release branch (or master), otherwise print
nothing.

PR tree-optimization/92429 do not fold when updating epilogue statements

This patch addresses the problem reported in PR92429.  When creating an
epilogue for vectorization we have to replace the SSA_NAMEs in the
PATTERN_DEF_SEQs and RELATED_STMTs of the epilogue's loop_vec_infos. When doing
this we were using simplify_replace_tree which always folds the replacement.
This may lead to a different tree-node than the one which was analyzed in
vect_loop_analyze.  In turn the new tree-node may require a different
vectorization than the one we had prepared for which caused the ICE in
question.

gcc/ChangeLog:
2020-01-16  Andre Vieira  <andre.simoesdiasvieira@arm.com>

PR tree-optimization/92429
* tree-ssa-loop-niter.h (simplify_replace_tree): Add parameter.
* tree-ssa-loop-niter.c (simplify_replace_tree): Add parameter to
control folding.
* tree-vect-loop.c (update_epilogue_vinfo): Do not fold when replacing
tree.

gcc/testsuite/ChangeLog:
2020-01-16  Andre Vieira  <andre.simoesdiasvieira@arm.com>

PR tree-optimization/92429
* gcc.dg/vect/pr92429.c: New test.

Work around array out of bounds warning in mkdeps

This suppresses an array out of bounds warning in mkdeps.c as proposed
by Martin Sebor in the bugzilla.

array subscript 2 is outside array bounds of ‘const char [2]’

Since this warning does occur during bootstrap it currently breaks
werror builds on IBM Z.

The problem can be reproduced also on x86_64 by changing the inlining
threshold using: --param max-inline-insns-auto=80

Bootstrapped and regression tested on x86_64 and IBM Z.

libcpp/ChangeLog:

2020-01-16  Andreas Krebbel  <krebbel@linux.ibm.com>

PR tree-optimization/92176
* mkdeps.c (deps_add_default_target): Avoid calling apply_vpath to
suppress an array out of bounds warning.

aarch64: Fix BE SVE mode punning involving floats

The patterns used by aarch64_split_sve_subreg_move only support
integer modes, so if the widest mode is a float, we should get
its integer equivalent.

Fixes gcc.target/aarch64/sel_3.c for big-endian targets.

2020-01-16  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
* config/aarch64/aarch64.c (aarch64_split_sve_subreg_move): Apply
aarch64_sve_int_mode to each mode.

PR93253 – Document BOZ changes, make it friendlier in legacy code

        PR fortran/93253
        * check.c (gfc_invalid_boz): Mention -fallow-invalid-boz
        in the error message.
        * gfortran.texi (BOZ literal constants): List another missing
        extension and refer to -fallow-invalid-boz.
        * lang.opt (fallow-invalid-boz): Also mention 'X' in the help text
        as it is not covered by the previous wording.
        * primary.c (match_boz_constant): Tweak wording such that it is
        clear how to fix the nonstandard use.

        PR fortran/93253
        * fortran.dg/boz_7.f90: Updated dg-error.

Daily bump.

analyzer: add note about -fdump-ipa-analyzer to internal docs

gcc/ChangeLog:
* doc/analyzer.texi (Overview): Add note about
-fdump-ipa-analyzer.

analyzer: fix comment

I rewrote class impl_region_model_context to avoid using multiple
inheritance during patch review but forgot to update this comment.

Fix it.

gcc/analyzer/ChangeLog:
* engine.cc (class impl_region_model_context): Fix comment.

Fix "PR c++/91073 if constexpr no longer works directly with Concepts."

This is a rather serious regression, filed in July 2019. Luckily the
fix is simple: is localized to parser.c and cp-tree.h in cp and boils
down to only a few lines.

Testing OK on x86_64-linux. Approved off-line by Jason Merrill.

/cp
PR c++/91073
* cp-tree.h (is_constrained_auto): New.
* parser.c (cp_parser_maybe_commit_to_declaration): Correctly
handle concept-check expressions; take a cp_decl_specifier_seq*
instead of a bool.
(cp_parser_condition): Update call.
(cp_parser_simple_declaration): Likewise.
(cp_parser_placeholder_type_specifier): Correctly handle
concept-check expressions.

/testsuite
PR c++/91073
* g++.dg/concepts/pr91073-1.C: New.
* g++.dg/concepts/pr91073-2.C: Likewise.

Revert "PR c++/33799 - destroy return value if local cleanup throws."

This change was blocking the coroutines merge, so I'm backing it out for now
to adjust my approach.

This reverts commit 7c82dd6c02d44d9d2cd84dda137c00b1a3cd6c90.

PR c++/93257 - consteval void function.

A prvalue can have void type, and if it doesn't do anything prohibited in a
constant expression, it's vacuously constant.

* constexpr.c (verify_constant): Allow void_node.

PR c++/92871 - bad code with xvalue and GNU ?: extension.

I steered Jakub wrong on the desired behavior for temp-extend1.C in the
context of bug 92831; it doesn't make sense to try to extend the lifetime of
a temporary that we've already materialized to evaluate the test.  So this
patch munges the stabilized expression so that it won't be subject to
lifetime extension.

* call.c (prevent_lifetime_extension): New.
(build_conditional_expr_1): Use it.

Fix ctz issues (PR93231)

Further improve the ctz recognition: Avoid ICEing on negative shift
counts or multiply constants.  Check the type is a char type for the
string constant case to avoid accidentally matching a wide STRING_CST.
Add a tree_expr_nonzero_p check to allow the optimization even if
CTZ_DEFINED_VALUE_AT_ZERO returns 0 or 1.  Add extra test cases.

Bootstrap OK on AArch64 and x64.

    gcc/
PR tree-optimization/93231
* tree-ssa-forwprop.c (optimize_count_trailing_zeroes): Check
input_type is unsigned.  Use tree_to_shwi for shift constant.
Check CST_STRING element size is CHAR_TYPE_SIZE bits.
(simplify_count_trailing_zeroes): Add test to handle known non-zero
inputs more efficiently.

    testsuite/
PR tree-optimization/93231
* gcc.dg/pr90838.c: New test.
* gcc.dg/pr93231.c: New test.
* gcc.target/aarch64/pr90838.c: Use #define u 0.

libstdc++: Fix weakly_incrementable to allow __int128 (PR 93267)

The __iota_diff_t alias can be the type __int128, but that does not
satisfy the signed_integral and __is_signed_integer_like concepts when
__STRICT_ANSI__ is defined (which is true for -std=c++2a).

Because weakly_incrementable is defined in terms of signed_integral, it
is not satisfied by __int128, which means iota_view's iterator doesn't
always satisfy input_or_output_iterator and so iota_view is not always a
range.

The solution is to define __max_size_type and __max_diff_type using
__int128, so that __is_signed_integer_like allows __int128, and then
make weakly_incrementable use __is_signed_integer_like instead of
signed_integral.

PR libstdc++/93267
* include/bits/iterator_concepts.h (__max_diff_type, __max_size_type):
Move here from <bits/range_access.h> and define using __int128 when
available.
(__is_integer_like, __is_signed_integer_like): Move here from
<bits/range_access.h>.
(weakly_incrementable): Use __is_signed_integer_like.
* include/bits/range_access.h (__max_diff_type, __max_size_type)
(__is_integer_like, __is_signed_integer_like): Move to
<bits/iterator_concepts.h>.
(__make_unsigned_like_t): Move here from <ranges>.
* include/std/ranges (__make_unsigned_like_t): Move to
<bits/range_access.h>.
(iota_view): Replace using-directive with using-declarations.
* testsuite/std/ranges/iota/93267.cc: New test.
* testsuite/std/ranges/iota_view.cc: Move to new 'iota' sub-directory.

Remove invalid SSE2 ISA requirements in *movsf_internal.

* config/i386/i386.md (*movsf_internal): Do not require
SSE2 ISA for alternatives 14 and 15.

[PR90916] Fix typo

middle-end/93273 - fix sinking clobbers across backedges

The previous work to fix PR93199 didn't take into account backedges
when defering insertion.  The following simply avoids to defer in that
case since we know we'll not take secondary opportunities there.

2020-01-15  Richard Biener  <rguenther@suse.de>

        PR middle-end/93273
        * tree-eh.c (sink_clobbers): If we already visited the destination
        block do not defer insertion.
        (pass_lower_eh_dispatch::execute): Maintain BB_VISITED for
        the purpose of defered insertion.

* g++.dg/torture/pr93273.C: New testcase.

Bump gcc/BASE-VER to 10.0.1 now that we are in stage4.

2020-01-15  Jakub Jelinek  <jakub@redhat.com>

* BASE-VER: Bump to 10.0.1.

PR tree-optimization/93247 - ICE in get_load_store_type

My earlier update_epilogue_loop_vinfo patch introduced an ICE on these
tests for AVX512.  If we use pattern stmts, STMT_VINFO_GATHER_SCATTER_P
is valid for both the original stmt and the pattern stmt, but
STMT_VINFO_MEMORY_ACCESS_TYPE is valid only for the latter.

2020-01-15  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
PR tree-optimization/93247
* tree-vect-loop.c (update_epilogue_loop_vinfo): Check the access
type of the stmt that we're going to vectorize.

gcc/testsuite/
PR tree-optimization/93247
* gcc.dg/vect/pr93247-1.c: New test.
* gcc.dg/vect/pr93247-2.c: Likewise.

Fix type mismatch in SLPed constructors

Having the "same" vector types with different modes means that we can
end up vectorising a constructor with a different mode from the lhs.
This patch adds a VIEW_CONVERT_EXPR in that case.

This showed up on existing tests when testing with fixed-length
-msve-vector-bits=128.

2020-01-15  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
* tree-vect-slp.c (vectorize_slp_instance_root_stmt): Use a
VIEW_CONVERT_EXPR if the vectorized constructor has a diffeent
type from the lhs.

Add *.md diff=md.

2020-01-15  Segher Boessenkool  <segher@kernel.crashing.org>
    Jakub Jelinek  <jakub@redhat.com>

* .gitattributes: Add *.md diff=md.
contrib/
* gcc-git-customization.sh: Change uses to use in comment.

Do not call streamer_read_hwi in a function call.

* ipa-profile.c (ipa_profile_read_edge_summary): Do not allow
2 calls of streamer_read_hwi in a function call.

Handle output of older git in gcc-descr and gcc-undescr aliases.

contrib: Don't add push rules for personal and vendor spaces.

Originally, it seemed like a good idea to add automatic 'push' rules
to the git configuration, so that personal- and vendor-space commits
would automatically push to the right place.  Unfortunately, this
changes git's behaviour and with these settings "git push" will try to
push all branches in a local tree up to the corresponding location on
the server (ignoring the push.default setting).  The only known
mitigation for this is to ALWAYS use "git push <server> <branch>".

So instead, we no-longer add those rules by default and will document
the options on the wiki.  We don't automatically remove the push
entries but do print out the command that will do so, if the user so
wishes.

* gcc-git-customization.sh: Explain why we want the user's
upstream account name.  Don't add push rules.  Check if push rules
have been added and suggest that they should be removed.
* git-fetch-vendor.sh: Don't add push rules.

gcc/testsuite/ChangeLog:

* gcc.dg/Wstringop-overflow-17.c: Tweak test to avoid unrelated
failures due the absence of loop unrolling.

Optimize alias subset recording

When an alias-set is an already existing subset there is no need
to re-record its children as childs of the parent.

2020-01-15  Richard Biener  <rguenther@suse.de>

* alias.c (record_alias_subset): Avoid redundant work when
subset is already recorded.

Fix setting of DECL_CONTEXT in pushdecl (PR c/93072).

Bug 93072 is a case where the C front end (a) wrongly interprets an
inline declaration at block scope as indicating that DECL_CONTEXT
should be set for an inline function and (b) this results in an ICE.
This is a regression resulting from a previous fix of mine for other
bugs involving such declarations being wrongly interpreted elsewhere
as nested function declarations.  The fix is similar to the previous
fix: use TREE_PUBLIC instead of DECL_EXTERNAL in another place as the
relevant test to determine whether to set DECL_CONTEXT.  (When a
variable reaches the code in question in pushdecl, the two are
equivalent.)

Bootstrapped with no regressions for x86_64-pc-linux-gnu.

PR c/93072
gcc/c:
* c-decl.c (pushdecl): Use TREE_PUBLIC, not DECL_EXTERNAL, to
determine whether to set DECL_CONTEXT.

gcc/testsuite:
* gcc.dg/inline-42.c, gcc.dg/inline-43.c: New tests.

invoke.texi: update -fdiagnostics-show-cwe for analyzer

gcc/ChangeLog:
* doc/invoke.texi (-fdiagnostics-show-cwe): Add note that some of
the analyzer options provide CWE identifiers.

analyzer: fix ICE on METHOD_TYPE (PR 93212)

PR analyzer/93212 reports an ICE when attempting to use -fanalyzer
on a C++ source file.  That isn't supported yet, but the fix is
trivial (handling METHOD_TYPE as well as FUNCTION_TYPE).

gcc/analyzer/ChangeLog:
PR analyzer/93212
* region-model.cc (make_region_for_type): Use
FUNC_OR_METHOD_TYPE_P rather than comparing against FUNCTION_TYPE.
* region-model.h (function_region::function_region): Likewise.

analyzer: fix global-sm-state issue affecting sm-signal

sm-signal.cc was failing to warn about the use of an fprintf call in a
signal handler when the signal handler function was non-static.

The root cause was a failure to copy global sm-state within
sm_state_map::clone_with_remapping as called by
program_state::can_merge_with_p, which led to the exploded node for
the entrypoint to the handler in the "normal" state being erroneously
reused for the "in_signal_handler" state, thus losing the global state,
and thus failing to warn.

This patch fixes the above, so that non-equal global sm-state values
prevent merger of program_state, thus requiring separate exploded nodes
for the "normal" and "in signal handler" states, and thus triggering
the warning for the reproducer.

gcc/analyzer/ChangeLog:
* program-state.cc (sm_state_map::clone_with_remapping): Copy
m_global_state.
(selftest::test_program_state_merging_2): New selftest.
(selftest::analyzer_program_state_cc_tests): Call it.

gcc/testsuite/ChangeLog:
* gcc.dg/analyzer/signal-6.c: New test.

analyzer: cleanups to checker_path

This patch adds DISABLE_COPY_AND_ASSIGN to checker_path, and makes its
fields private.

gcc/analyzer/ChangeLog:
* checker-path.h (checker_path::get_checker_event): New function.
(checker_path): Add DISABLE_COPY_AND_ASSIGN; make fields private.
* diagnostic-manager.cc
(diagnostic_manager::prune_for_sm_diagnostic): Replace direct
access to checker_path::m_events with accessor functions.  Fix
overlong line.
(diagnostic_manager::prune_interproc_events): Replace direct
access to checker_path::m_events with accessor functions.
(diagnostic_manager::finish_pruning): Likewise.

analyzer: delete checker_event::clone

checker_event has a clone vfunc implemented by all the concrete
subclasses, but this is never used (a holdover from a very early
implementation).  This patch deletes it.

gcc/analyzer/ChangeLog:
* checker-path.h (checker_event::clone): Delete vfunc decl.
(debug_event::clone): Delete vfunc impl.
(custom_event::clone): Delete vfunc impl.
(statement_event::clone): Delete vfunc impl.
(function_entry_event::clone): Delete vfunc impl.
(state_change_event::clone): Delete vfunc impl.
(start_cfg_edge_event::clone): Delete vfunc impl.
(end_cfg_edge_event::clone): Delete vfunc impl.
(call_event::clone): Delete vfunc impl.
(return_event::clone): Delete vfunc impl.
(setjmp_event::clone): Delete vfunc impl.
(rewind_from_longjmp_event::clone): Delete vfunc impl.
(rewind_to_setjmp_event::clone): Delete vfunc impl.
(warning_event::clone): Delete vfunc impl.

analyzer: ensure .dot output is valid for an empty BB

This patch fixes an issue with the output of -fdump-analyzer-supergraph
on BBs with no statements, where the resulting files were unreadable by
dot e.g.:

Error: syntax error in line 1
... <TABLE BORDER="0"></TABLE> ...
in label of node node_10

gcc/analyzer/ChangeLog:
* supergraph.cc (supernode::dump_dot): Ensure that the TABLE
element has at least one TR.

gcc/testsuite/ChangeLog:
* gcc.dg/analyzer/dot-output.c: Add test coverage for a BB with
no statements.

analyzer: fix tests for UNKNOWN_LOCATION

In the reproducer for PR analyzer/58237 I noticed that some events were
missing locations (and text); for example event 3 here:

    |   15 |   while (fgets(buf, 10, fp) != NULL)
    |      |         ~
    |      |         |
    |      |         (2) following 'false' branch...
    |
  'f1': event 3
    |
    |cc1:
    |
  'f1': event 4
    |
    |<source>:19:1:
    |   19 | }
    |      | ^
    |      | |
    |      | (4) 'fp' leaks here; was opened at (1)
    |

The root cause is that various places in the analyzer compare locations
against UNKNOWN_LOCATION, which fails to detect an unknown location for
the case where an unknown_location has been wrapped into an ad-hoc
location to record a block.

This patch fixes the issue by using get_pure_location whenever testing
against UNKNOWN_LOCATION to look through ad-hoc wrappers.

For the case above, it thus picks a better location in
supernode::get_start_location for event (3) above, improving it to:

    |   15 |   while (fgets(buf, 10, fp) != NULL)
    |      |         ~
    |      |         |
    |      |         (2) following 'false' branch...
    |......
    |   19 | }
    |      | ~
    |      | |
    |      | (3) ...to here
    |      | (4) 'fp' leaks here; was opened at (1)
    |

gcc/analyzer/ChangeLog:
PR analyzer/58237
* engine.cc (leak_stmt_finder::find_stmt): Use get_pure_location
when comparing against UNKNOWN_LOCATION.
(stmt_requires_new_enode_p): Likewise.
(exploded_graph::dump_exploded_nodes): Likewise.
* supergraph.cc (supernode::get_start_location): Likewise.
(supernode::get_end_location): Likewise.

gcc/testsuite/ChangeLog:
PR analyzer/58237
* gcc.dg/analyzer/file-paths-1.c: New test.

tree-diagnostic-path.cc: properly handle ad-hoc wrappers of UNKNOWN_LOCATION

In the reproducer for PR analyzer/58237 I noticed that some events that
were missing locations were also missing text; for example event 3 here:

    |   15 |   while (fgets(buf, 10, fp) != NULL)
    |      |         ~
    |      |         |
    |      |         (2) following 'false' branch...
    |
  'f1': event 3
    |
    |cc1:
    |

The root cause is that the path_summary-printing code doesn't consider
ad-hoc locations when looking for reserved locations, and so fails to
detect an unknown location for the case where an unknown location has
been wrapped into an ad-hoc location to record a block.

This patch fixes the issue by using get_pure_location, thus looking
through ad-hoc wrappers, improving the result to:

    |   15 |   while (fgets(buf, 10, fp) != NULL)
    |      |         ~
    |      |         |
    |      |         (2) following 'false' branch...
    |
  'f1': event 3
    |
    |cc1:
    | (3): ...to here
    |

gcc/ChangeLog:
* tree-diagnostic-path.cc (path_summary::event_range::print):
When testing for UNKNOWN_LOCATION, look through ad-hoc wrappers
using get_pure_location.

analyzer: add known stdio functions to sm-file.cc (PR analyzer/58237)

The analyzer ought to report various file leaks for the reproducer in
PR analyzer/58237, such as:

  void f1(const char *str)
  {
    FILE * fp = fopen(str, "r");
    char buf[10];
    while (fgets(buf, 10, fp) != NULL)
    {
      /* Do something with buf */
    }
    /* Missing call to fclose. Need warning here for resource leak */
  }

but fails to do so, due to not recognizing fgets, and thus
conservatively assuming that it could close "fp".

This patch adds a function_set to sm-file.cc of numerous stdio.h
functions that are known to not close the file (and which require a
valid FILE *, but that's a matter for a followup), fixing the issue.

gcc/analyzer/ChangeLog:
PR analyzer/58237
* analyzer-selftests.cc (selftest::run_analyzer_selftests): Call
selftest::analyzer_sm_file_cc_tests.
* analyzer-selftests.h (selftest::analyzer_sm_file_cc_tests): New
decl.
* sm-file.cc: Include "analyzer/function-set.h" and
"analyzer/analyzer-selftests.h".
(get_file_using_fns): New function.
(is_file_using_fn_p): New function.
(fileptr_state_machine::on_stmt): Return true for known functions.
(selftest::analyzer_sm_file_cc_tests): New function.

gcc/testsuite/ChangeLog:
PR analyzer/58237
* gcc.dg/analyzer/file-1.c (test_4): New.
* gcc.dg/analyzer/file-pr58237.c: New test.

tree-optimization: Fix tree dse of __*_chk PR93262

The following testcase shows that GCC trunk mishandles DSE of __*_chk
calls.  Tail trimming of the calls is fine, we want to just decrease the
third argument and keep the first two and last arguments unmodified.
But for head trimming, we currently increment the two by head_trim and
decrease the third by head_trim, so
  __builtin___memcpy_chk (&a, b_2(D), 48, 32);
  __builtin_memset (&a, 32, 16);
into:
  _5 = b_2(D) + 16;
  __builtin___memcpy_chk (&MEM <char> [(void *)&a + 16B], _5, 32, 32);
  __builtin_memset (&a, 32, 16);
This is wrong, because the 32 was the determined (maximum) size of the
destination (char a[32]), but &a[16] has maximum size of 16, not 32.
The __builtin___memcpy_chk (&MEM <char> [(void *)&a + 16B], _5, 32, 32);
call is just folded later into
__builtin_memcpy (&MEM <char> [(void *)&a + 16B], _5, 32);
because it says that it copies as many bytes into destination as the
destination has.  We need:
  __builtin___memcpy_chk (&MEM <char> [(void *)&a + 16B], _5, 32, 16);
instead, which will terminate the program instead of letting it silently
overflow the buffer.
The patch just punts if we'd need to decrease the last argument below 0.

Fortunately, release branches are unaffected.
P.S. it was quite hard to make the runtime test working, in builtins.exp
neither dg-options nor dg-additional-options work and builtins.exp adds
-fno-tree-dse among several other -fno-* options.  Fortunately optimize
attribute works.

2020-01-15  Jakub Jelinek  <jakub@redhat.com>

PR tree-optimization/93262
* tree-ssa-dse.c (maybe_trim_memstar_call): For *_chk builtins,
perform head trimming only if the last argument is constant,
either all ones, or larger or equal to head trim, in the latter
case decrease the last argument by head_trim.

* gcc.c-torture/execute/builtins/pr93262-chk.c: New test.
* gcc.c-torture/execute/builtins/pr93262-chk-lib.c: New file.
* gcc.c-torture/execute/builtins/pr93262-chk.x: New file.

tree-optimization: Fix tree dse of strncpy PR93249

As the testcase shows, tail trimming of strncpy in tree-ssa-dse.c is fine,
we just copy or clear fewer bytes in the destination, but unlike
memcpy/memset etc., head trimming is problematic in certain cases.
If we can prove that there are no zero bytes among initial head_trim bytes,
it is ok to trim it, if we can prove there is at least one zero byte among
initial head_trim bytes, we could (not implemented in the patch) turn
the strncpy into memset 0, but otherwise we need to avoid the head trimming,
because the presence or absence of NUL byte there changes the behavior for
subsequent bytes, whether further bytes from src are copied or if further
bytes are cleared.

2020-01-15  Jakub Jelinek  <jakub@redhat.com>

PR tree-optimization/93249
* tree-ssa-dse.c: Include builtins.h and gimple-fold.h.
(maybe_trim_memstar_call): Move head_trim and tail_trim vars to
function body scope, reindent.  For BUILTIN_IN_STRNCPY*, don't
perform head trim unless we can prove there are no '\0' chars
from the source among the first head_trim chars.

* gcc.c-torture/execute/pr93249.c: New test.

Daily bump.

analyzer: introduce a set of known async-signal-unsafe functions

This patch uses the class function_set from the previous patch to
generalize the test for an fprintf inside a signal handler to
check for a set of known async-signal-unsafe functions.

gcc/analyzer/ChangeLog:
* analyzer-selftests.cc (selftest::run_analyzer_selftests): Call
selftest::analyzer_sm_signal_cc_tests.
* analyzer-selftests.h (selftest::analyzer_sm_signal_cc_tests):
New decl.
* sm-signal.cc: Include "analyzer/function-set.h" and
"analyzer/analyzer-selftests.h".
(get_async_signal_unsafe_fns): New function.
(signal_unsafe_p): Reimplement in terms of the above.
(selftest::analyzer_sm_signal_cc_tests): New function.

gcc/testsuite/ChangeLog:
* gcc.dg/analyzer/signal-5.c: New test.

analyzer: add function-set.cc/h

This patch adds a simple mechanism for tracking sets of functions
for which a particular property holds, as a pragmatic way to build
knowledge about important APIs into the analyzer without requiring
markup of the user's libc.

gcc/ChangeLog:
* Makefile.in (ANALYZER_OBJS): Add analyzer/function-set.o.

gcc/analyzer/ChangeLog:
* analyzer-selftests.cc (selftest::run_analyzer_selftests): Call
selftest::analyzer_function_set_cc_tests.
* analyzer-selftests.h (selftest::analyzer_function_set_cc_tests):
New decl.
* function-set.cc: New file.
* function-set.h: New file.

analyzer: purge state for unknown function calls

Whilst analyzing the reproducer for detecting CVE-2005-1689
(krb5-1.4.1's src/lib/krb5/krb/recvauth.c), the analyzer reports
a false double-free of the form:

  krb5_xfree(inbuf.data);
  krb5_read_message(..., &inbuf);
  krb5_xfree(inbuf.data); /* false diagnostic here.  */

where the call to krb5_read_message overwrites inbuf.data with
a freshly-malloced buffer.

This patch fixes the issue by purging state more thorougly when
handling a call with unknown behavior, by walking the graph of
memory regions that are reachable from the call.

gcc/analyzer/ChangeLog:
* analyzer.h (fndecl_has_gimple_body_p): New decl.
* engine.cc (impl_region_model_context::on_unknown_change): New
function.
(fndecl_has_gimple_body_p): Make non-static.
(exploded_node::on_stmt): Treat __analyzer_dump_exploded_nodes as
known.  Track whether we have a call with unknown side-effects and
pass it to on_call_post.
* exploded-graph.h (impl_region_model_context::on_unknown_change):
New decl.
* program-state.cc (sm_state_map::on_unknown_change): New function.
* program-state.h (sm_state_map::on_unknown_change): New decl.
* region-model.cc: Include "bitmap.h".
(region_model::on_call_pre): Return a bool, capturing whether the
call has unknown side effects.
(region_model::on_call_post): Add arg "bool unknown_side_effects"
and if true, call handle_unrecognized_call.
(class reachable_regions): New class.
(region_model::handle_unrecognized_call): New function.
* region-model.h (region_model::on_call_pre): Return a bool.
(region_model::on_call_post): Add arg "bool unknown_side_effects".
(region_model::handle_unrecognized_call): New decl.
(region_model_context::on_unknown_change): New vfunc.
(test_region_model_context::on_unknown_change): New function.

gcc/testsuite/ChangeLog:
* gcc.dg/analyzer/data-model-1.c: Remove xfail.
* gcc.dg/analyzer/data-model-5b.c: Likewise.
* gcc.dg/analyzer/data-model-5c.c: Likewise.
* gcc.dg/analyzer/setjmp-3.c: Mark "foo" as pure.
* gcc.dg/analyzer/setjmp-4.c: Likewise.
* gcc.dg/analyzer/setjmp-6.c: Likewise.
* gcc.dg/analyzer/setjmp-7.c: Likewise.
* gcc.dg/analyzer/setjmp-7a.c: Likewise.
* gcc.dg/analyzer/setjmp-8.c: Likewise.
* gcc.dg/analyzer/setjmp-9.c: Likewise.
* gcc.dg/analyzer/unknown-fns.c: New test.

analyzer: fix dedupe issue seen with CVE-2005-1689

Whilst analyzing the reproducer for detecting CVE-2005-1689
(krb5-1.4.1's src/lib/krb5/krb/recvauth.c), the analyzer reported
11 double-free diagnostics on lines of the form:

   krb5_xfree(inbuf.data);

with no deduplication occcurring.

The root cause is that the diagnostics each have a COMPONENT_REF for
the inbuf.data, but they are different trees, and the de-duplication
logic was using pointer equality.

This patch replaces the pointer equality tests with calls to a new
pending_diagnostic::same_tree_p, implemented using simple_cst_equal.

With this patch, de-duplication occurs, and only 3 diagnostics are
reported.  The 11 diagnostics are partitioned into 3 dedupe keys,
2 with 2 duplicates and 1 with 7 duplicates.

gcc/analyzer/ChangeLog:
* diagnostic-manager.cc (saved_diagnostic::operator==): Move here
from header.  Replace pointer equality test on m_var with call to
pending_diagnostic::same_tree_p.
* diagnostic-manager.h (saved_diagnostic::operator==): Move to
diagnostic-manager.cc.
* pending-diagnostic.cc (pending_diagnostic::same_tree_p): New.
* pending-diagnostic.h (pending_diagnostic::same_tree_p): New.
* sm-file.cc (file_diagnostic::subclass_equal_p): Replace pointer
equality on m_arg with call to pending_diagnostic::same_tree_p.
* sm-malloc.cc (malloc_diagnostic::subclass_equal_p): Likewise.
(possible_null_arg::subclass_equal_p): Likewise.
(null_arg::subclass_equal_p): Likewise.
(free_of_non_heap::subclass_equal_p): Likewise.
* sm-pattern-test.cc (pattern_match::operator==): Likewise.
* sm-sensitive.cc (exposure_through_output_file::operator==):
Likewise.
* sm-taint.cc (tainted_array_index::operator==): Likewise.

gcc/testsuite/ChangeLog:
* gcc.dg/analyzer/CVE-2005-1689-dedupe-issue.c: New test.

Remove bogus initial lines from test.

2020-01-15  Jakub Jelinek  <jakub@redhat.com>

PR lto/91576
* g++.dg/lto/odr-8_1.C: Remove bogus initial lines.

i386: Fix wrong-code x86 issue with avx512{f,vl} fma PR93009

As mentioned in the PR, the following testcase is miscompiled with avx512vl.
The reason is that the fma *_bcst_1 define_insns have two alternatives:
"=v,v" "0,v" "v,0" "m,m" and use the same
vfmadd213* %3<avx512bcst>, %2, %0<sd_mask_op4>
pattern.  If the first alternative is chosen, everything is ok, but if the
second alternative is chosen, %2 and %0 are the same register, so instead
of doing dest=dest*another+membcst we do dest=dest*dest+membcst.
Now, to fix this, either we'd need separate:
  "vfmadd213<ssemodesuffix>\t{%3<avx512bcst>, %2, %0<sd_mask_op4>|%0<sd_mask_op4>, %2, %3<avx512bcst>}
   vfmadd213<ssemodesuffix>\t{%3<avx512bcst>, %1, %0<sd_mask_op4>|%0<sd_mask_op4>, %1, %3<avx512bcst>}"
where for the second alternative, we'd just use %1 instead of %2, but
what I think is actually cleaner is just use a single alternative and
make the two multiplication operands commutative, which they really are.

2020-01-15  Jakub Jelinek  <jakub@redhat.com>

PR target/93009
* config/i386/sse.md
(*<sd_mask_codefor>fma_fmadd_<mode><sd_maskz_name>_bcst_1,
*<sd_mask_codefor>fma_fmsub_<mode><sd_maskz_name>_bcst_1,
*<sd_mask_codefor>fma_fnmadd_<mode><sd_maskz_name>_bcst_1,
*<sd_mask_codefor>fma_fnmsub_<mode><sd_maskz_name>_bcst_1): Use
just a single alternative instead of two, make operands 1 and 2
commutative.

* gcc.target/i386/avx512vl-pr93009.c: New test.

analyzer: better logging for dedupe_winners::add

gcc/analyzer/ChangeLog:
* diagnostic-manager.cc (dedupe_winners::add): Add logging
of deduplication decisions made.

[PR90916]  Use TI accessor.

PR c++/90916
* pt.c (retrieve_specialization): Use get_template_info, not open
coding access.

Compare TREE_ADDRESSABLE and TYPE_MODE when ODR checking types.

PR lto/91576
* ipa-devirt.c (odr_types_equivalent_p): Compare TREE_ADDRESSABLE and
TYPE_MODE.

* testsuite/g++.dg/lto/odr-8_0.C: New testcase.
* testsuite/g++.dg/lto/odr-8_1.C: New testcase.

Initial commit of analyzer

This patch adds a static analysis pass to the middle-end, focusing
for this release on C code, and malloc/free issues in particular.

See:
 https://gcc.gnu.org/wiki/DavidMalcolm/StaticAnalyzer

gcc/ChangeLog:
* Makefile.in (lang_opt_files): Add analyzer.opt.
(ANALYZER_OBJS): New.
(OBJS): Add digraph.o, graphviz.o, ordered-hash-map-tests.o,
tristate.o and ANALYZER_OBJS.
(TEXI_GCCINT_FILES): Add analyzer.texi.
* common.opt (-fanalyzer): New driver option.
* config.in: Regenerate.
* configure: Regenerate.
* configure.ac (--disable-analyzer, ENABLE_ANALYZER): New option.
(gccdepdir): Also create depdir for "analyzer" subdir.
* digraph.cc: New file.
* digraph.h: New file.
* doc/analyzer.texi: New file.
* doc/gccint.texi ("Static Analyzer") New menu item.
(analyzer.texi): Include it.
* doc/invoke.texi ("Static Analyzer Options"): New list and new section.
("Warning Options"): Add static analysis warnings to the list.
(-Wno-analyzer-double-fclose): New option.
(-Wno-analyzer-double-free): New option.
(-Wno-analyzer-exposure-through-output-file): New option.
(-Wno-analyzer-file-leak): New option.
(-Wno-analyzer-free-of-non-heap): New option.
(-Wno-analyzer-malloc-leak): New option.
(-Wno-analyzer-possible-null-argument): New option.
(-Wno-analyzer-possible-null-dereference): New option.
(-Wno-analyzer-null-argument): New option.
(-Wno-analyzer-null-dereference): New option.
(-Wno-analyzer-stale-setjmp-buffer): New option.
(-Wno-analyzer-tainted-array-index): New option.
(-Wno-analyzer-use-after-free): New option.
(-Wno-analyzer-use-of-pointer-in-stale-stack-frame): New option.
(-Wno-analyzer-use-of-uninitialized-value): New option.
(-Wanalyzer-too-complex): New option.
(-fanalyzer-call-summaries): New warning.
(-fanalyzer-checker=): New warning.
(-fanalyzer-fine-grained): New warning.
(-fno-analyzer-state-merge): New warning.
(-fno-analyzer-state-purge): New warning.
(-fanalyzer-transitivity): New warning.
(-fanalyzer-verbose-edges): New warning.
(-fanalyzer-verbose-state-changes): New warning.
(-fanalyzer-verbosity=): New warning.
(-fdump-analyzer): New warning.
(-fdump-analyzer-callgraph): New warning.
(-fdump-analyzer-exploded-graph): New warning.
(-fdump-analyzer-exploded-nodes): New warning.
(-fdump-analyzer-exploded-nodes-2): New warning.
(-fdump-analyzer-exploded-nodes-3): New warning.
(-fdump-analyzer-supergraph): New warning.
* doc/sourcebuild.texi (dg-require-dot): New.
(dg-check-dot): New.
* gdbinit.in (break-on-saved-diagnostic): New command.
* graphviz.cc: New file.
* graphviz.h: New file.
* ordered-hash-map-tests.cc: New file.
* ordered-hash-map.h: New file.
* passes.def (pass_analyzer): Add before
pass_ipa_whole_program_visibility.
* selftest-run-tests.c (selftest::run_tests): Call
selftest::ordered_hash_map_tests_cc_tests.
* selftest.h (selftest::ordered_hash_map_tests_cc_tests): New
decl.
* shortest-paths.h: New file.
* timevar.def (TV_ANALYZER): New timevar.
(TV_ANALYZER_SUPERGRAPH): Likewise.
(TV_ANALYZER_STATE_PURGE): Likewise.
(TV_ANALYZER_PLAN): Likewise.
(TV_ANALYZER_SCC): Likewise.
(TV_ANALYZER_WORKLIST): Likewise.
(TV_ANALYZER_DUMP): Likewise.
(TV_ANALYZER_DIAGNOSTICS): Likewise.
(TV_ANALYZER_SHORTEST_PATHS): Likewise.
* tree-pass.h (make_pass_analyzer): New decl.
* tristate.cc: New file.
* tristate.h: New file.

gcc/analyzer/ChangeLog:
* ChangeLog: New file.
* analyzer-selftests.cc: New file.
* analyzer-selftests.h: New file.
* analyzer.opt: New file.
* analysis-plan.cc: New file.
* analysis-plan.h: New file.
* analyzer-logging.cc: New file.
* analyzer-logging.h: New file.
* analyzer-pass.cc: New file.
* analyzer.cc: New file.
* analyzer.h: New file.
* call-string.cc: New file.
* call-string.h: New file.
* checker-path.cc: New file.
* checker-path.h: New file.
* constraint-manager.cc: New file.
* constraint-manager.h: New file.
* diagnostic-manager.cc: New file.
* diagnostic-manager.h: New file.
* engine.cc: New file.
* engine.h: New file.
* exploded-graph.h: New file.
* pending-diagnostic.cc: New file.
* pending-diagnostic.h: New file.
* program-point.cc: New file.
* program-point.h: New file.
* program-state.cc: New file.
* program-state.h: New file.
* region-model.cc: New file.
* region-model.h: New file.
* sm-file.cc: New file.
* sm-malloc.cc: New file.
* sm-malloc.dot: New file.
* sm-pattern-test.cc: New file.
* sm-sensitive.cc: New file.
* sm-signal.cc: New file.
* sm-taint.cc: New file.
* sm.cc: New file.
* sm.h: New file.
* state-purge.cc: New file.
* state-purge.h: New file.
* supergraph.cc: New file.
* supergraph.h: New file.

gcc/testsuite/ChangeLog:
* gcc.dg/analyzer/CVE-2005-1689-minimal.c: New test.
* gcc.dg/analyzer/abort.c: New test.
* gcc.dg/analyzer/alloca-leak.c: New test.
* gcc.dg/analyzer/analyzer-decls.h: New header.
* gcc.dg/analyzer/analyzer-verbosity-0.c: New test.
* gcc.dg/analyzer/analyzer-verbosity-1.c: New test.
* gcc.dg/analyzer/analyzer-verbosity-2.c: New test.
* gcc.dg/analyzer/analyzer.exp: New suite.
* gcc.dg/analyzer/attribute-nonnull.c: New test.
* gcc.dg/analyzer/call-summaries-1.c: New test.
* gcc.dg/analyzer/conditionals-2.c: New test.
* gcc.dg/analyzer/conditionals-3.c: New test.
* gcc.dg/analyzer/conditionals-notrans.c: New test.
* gcc.dg/analyzer/conditionals-trans.c: New test.
* gcc.dg/analyzer/data-model-1.c: New test.
* gcc.dg/analyzer/data-model-2.c: New test.
* gcc.dg/analyzer/data-model-3.c: New test.
* gcc.dg/analyzer/data-model-4.c: New test.
* gcc.dg/analyzer/data-model-5.c: New test.
* gcc.dg/analyzer/data-model-5b.c: New test.
* gcc.dg/analyzer/data-model-5c.c: New test.
* gcc.dg/analyzer/data-model-5d.c: New test.
* gcc.dg/analyzer/data-model-6.c: New test.
* gcc.dg/analyzer/data-model-7.c: New test.
* gcc.dg/analyzer/data-model-8.c: New test.
* gcc.dg/analyzer/data-model-9.c: New test.
* gcc.dg/analyzer/data-model-11.c: New test.
* gcc.dg/analyzer/data-model-12.c: New test.
* gcc.dg/analyzer/data-model-13.c: New test.
* gcc.dg/analyzer/data-model-14.c: New test.
* gcc.dg/analyzer/data-model-15.c: New test.
* gcc.dg/analyzer/data-model-16.c: New test.
* gcc.dg/analyzer/data-model-17.c: New test.
* gcc.dg/analyzer/data-model-18.c: New test.
* gcc.dg/analyzer/data-model-19.c: New test.
* gcc.dg/analyzer/data-model-path-1.c: New test.
* gcc.dg/analyzer/disabling.c: New test.
* gcc.dg/analyzer/dot-output.c: New test.
* gcc.dg/analyzer/double-free-lto-1-a.c: New test.
* gcc.dg/analyzer/double-free-lto-1-b.c: New test.
* gcc.dg/analyzer/double-free-lto-1.h: New header.
* gcc.dg/analyzer/equivalence.c: New test.
* gcc.dg/analyzer/explode-1.c: New test.
* gcc.dg/analyzer/explode-2.c: New test.
* gcc.dg/analyzer/factorial.c: New test.
* gcc.dg/analyzer/fibonacci.c: New test.
* gcc.dg/analyzer/fields.c: New test.
* gcc.dg/analyzer/file-1.c: New test.
* gcc.dg/analyzer/file-2.c: New test.
* gcc.dg/analyzer/function-ptr-1.c: New test.
* gcc.dg/analyzer/function-ptr-2.c: New test.
* gcc.dg/analyzer/function-ptr-3.c: New test.
* gcc.dg/analyzer/gzio-2.c: New test.
* gcc.dg/analyzer/gzio-3.c: New test.
* gcc.dg/analyzer/gzio-3a.c: New test.
* gcc.dg/analyzer/gzio.c: New test.
* gcc.dg/analyzer/infinite-recursion.c: New test.
* gcc.dg/analyzer/loop-2.c: New test.
* gcc.dg/analyzer/loop-2a.c: New test.
* gcc.dg/analyzer/loop-3.c: New test.
* gcc.dg/analyzer/loop-4.c: New test.
* gcc.dg/analyzer/loop.c: New test.
* gcc.dg/analyzer/malloc-1.c: New test.
* gcc.dg/analyzer/malloc-2.c: New test.
* gcc.dg/analyzer/malloc-3.c: New test.
* gcc.dg/analyzer/malloc-callbacks.c: New test.
* gcc.dg/analyzer/malloc-dce.c: New test.
* gcc.dg/analyzer/malloc-dedupe-1.c: New test.
* gcc.dg/analyzer/malloc-ipa-1.c: New test.
* gcc.dg/analyzer/malloc-ipa-10.c: New test.
* gcc.dg/analyzer/malloc-ipa-11.c: New test.
* gcc.dg/analyzer/malloc-ipa-12.c: New test.
* gcc.dg/analyzer/malloc-ipa-13.c: New test.
* gcc.dg/analyzer/malloc-ipa-2.c: New test.
* gcc.dg/analyzer/malloc-ipa-3.c: New test.
* gcc.dg/analyzer/malloc-ipa-4.c: New test.
* gcc.dg/analyzer/malloc-ipa-5.c: New test.
* gcc.dg/analyzer/malloc-ipa-6.c: New test.
* gcc.dg/analyzer/malloc-ipa-7.c: New test.
* gcc.dg/analyzer/malloc-ipa-8-double-free.c: New test.
* gcc.dg/analyzer/malloc-ipa-8-lto-a.c: New test.
* gcc.dg/analyzer/malloc-ipa-8-lto-b.c: New test.
* gcc.dg/analyzer/malloc-ipa-8-lto-c.c: New test.
* gcc.dg/analyzer/malloc-ipa-8-lto.h: New test.
* gcc.dg/analyzer/malloc-ipa-8-unchecked.c: New test.
* gcc.dg/analyzer/malloc-ipa-9.c: New test.
* gcc.dg/analyzer/malloc-macro-inline-events.c: New test.
* gcc.dg/analyzer/malloc-macro-separate-events.c: New test.
* gcc.dg/analyzer/malloc-macro.h: New header.
* gcc.dg/analyzer/malloc-many-paths-1.c: New test.
* gcc.dg/analyzer/malloc-many-paths-2.c: New test.
* gcc.dg/analyzer/malloc-many-paths-3.c: New test.
* gcc.dg/analyzer/malloc-paths-1.c: New test.
* gcc.dg/analyzer/malloc-paths-10.c: New test.
* gcc.dg/analyzer/malloc-paths-2.c: New test.
* gcc.dg/analyzer/malloc-paths-3.c: New test.
* gcc.dg/analyzer/malloc-paths-4.c: New test.
* gcc.dg/analyzer/malloc-paths-5.c: New test.
* gcc.dg/analyzer/malloc-paths-6.c: New test.
* gcc.dg/analyzer/malloc-paths-7.c: New test.
* gcc.dg/analyzer/malloc-paths-8.c: New test.
* gcc.dg/analyzer/malloc-paths-9.c: New test.
* gcc.dg/analyzer/malloc-vs-local-1a.c: New test.
* gcc.dg/analyzer/malloc-vs-local-1b.c: New test.
* gcc.dg/analyzer/malloc-vs-local-2.c: New test.
* gcc.dg/analyzer/malloc-vs-local-3.c: New test.
* gcc.dg/analyzer/malloc-vs-local-4.c: New test.
* gcc.dg/analyzer/operations.c: New test.
* gcc.dg/analyzer/params-2.c: New test.
* gcc.dg/analyzer/params.c: New test.
* gcc.dg/analyzer/paths-1.c: New test.
* gcc.dg/analyzer/paths-1a.c: New test.
* gcc.dg/analyzer/paths-2.c: New test.
* gcc.dg/analyzer/paths-3.c: New test.
* gcc.dg/analyzer/paths-4.c: New test.
* gcc.dg/analyzer/paths-5.c: New test.
* gcc.dg/analyzer/paths-6.c: New test.
* gcc.dg/analyzer/paths-7.c: New test.
* gcc.dg/analyzer/pattern-test-1.c: New test.
* gcc.dg/analyzer/pattern-test-2.c: New test.
* gcc.dg/analyzer/pointer-merging.c: New test.
* gcc.dg/analyzer/pr61861.c: New test.
* gcc.dg/analyzer/pragma-1.c: New test.
* gcc.dg/analyzer/scope-1.c: New test.
* gcc.dg/analyzer/sensitive-1.c: New test.
* gcc.dg/analyzer/setjmp-1.c: New test.
* gcc.dg/analyzer/setjmp-2.c: New test.
* gcc.dg/analyzer/setjmp-3.c: New test.
* gcc.dg/analyzer/setjmp-4.c: New test.
* gcc.dg/analyzer/setjmp-5.c: New test.
* gcc.dg/analyzer/setjmp-6.c: New test.
* gcc.dg/analyzer/setjmp-7.c: New test.
* gcc.dg/analyzer/setjmp-7a.c: New test.
* gcc.dg/analyzer/setjmp-8.c: New test.
* gcc.dg/analyzer/setjmp-9.c: New test.
* gcc.dg/analyzer/signal-1.c: New test.
* gcc.dg/analyzer/signal-2.c: New test.
* gcc.dg/analyzer/signal-3.c: New test.
* gcc.dg/analyzer/signal-4a.c: New test.
* gcc.dg/analyzer/signal-4b.c: New test.
* gcc.dg/analyzer/strcmp-1.c: New test.
* gcc.dg/analyzer/switch.c: New test.
* gcc.dg/analyzer/taint-1.c: New test.
* gcc.dg/analyzer/zlib-1.c: New test.
* gcc.dg/analyzer/zlib-2.c: New test.
* gcc.dg/analyzer/zlib-3.c: New test.
* gcc.dg/analyzer/zlib-4.c: New test.
* gcc.dg/analyzer/zlib-5.c: New test.
* gcc.dg/analyzer/zlib-6.c: New test.
* lib/gcc-defs.exp (dg-check-dot): New procedure.
* lib/target-supports.exp (check_dot_available): New procedure.
(check_effective_target_analyzer): New.
* lib/target-supports-dg.exp (dg-require-dot): New procedure.

PR c++/92590 - wrong handling of inherited default ctor.

I thought my earlier fix for 91930 was an obvious bug fix, but apparently an
inherited constructor does not count as user-declared.  So this patch
reverts that change and the other follow-on patches, and fixes 91930
differently, by not letting the inherited default constructor hide the
implicitly-declared default constructor.

* class.c (add_method): A constrained inherited ctor doesn't hide an
implicit derived ctor.

Revert:
PR c++/91930 - ICE with constrained inherited default ctor.
* name-lookup.c (do_class_using_decl): Set TYPE_HAS_USER_CONSTRUCTOR
for inherited constructor.
PR c++/92552 - ICE with inherited constrained default ctor.
* pt.c (instantiate_class_template_1): Copy
TYPE_HAS_USER_CONSTRUCTOR.
PR c++/92594 - ICE with inherited trivial default ctor.
* method.c (trivial_fn_p): Treat an inherited default constructor
like a normal default constructor.

[PR90916] ICE in retrieve specialization

https://gcc.gnu.org/ml/gcc-patches/2020-01/msg00809.html
PR c++/90916
* pt.c (retrieve_specialization): Get the TI from the decl or the
classtype as appropriate.

PR target/93254 - -msse generates sse2 instructions

* config/i386/i386.md (*movsf_internal): Require SSE2 ISA for
alternatives 9 and 10.

hash-table.h: support non-zero empty values in empty_slow (v2)

gcc/cp/ChangeLog:
* cp-gimplify.c (source_location_table_entry_hash::empty_zero_p):
New static constant.
* cp-tree.h (named_decl_hash::empty_zero_p): Likewise.
(struct named_label_hash::empty_zero_p): Likewise.
* decl2.c (mangled_decl_hash::empty_zero_p): Likewise.

gcc/ChangeLog:
* attribs.c (excl_hash_traits::empty_zero_p): New static constant.
* gcov.c (function_start_pair_hash::empty_zero_p): Likewise.
* graphite.c (struct sese_scev_hash::empty_zero_p): Likewise.
* hash-map-tests.c (selftest::test_nonzero_empty_key): New selftest.
(selftest::hash_map_tests_c_tests): Call it.
* hash-map-traits.h (simple_hashmap_traits::empty_zero_p):
New static constant, using the value of = H::empty_zero_p.
(unbounded_hashmap_traits::empty_zero_p): Likewise, using the value
from default_hash_traits <Value>.
* hash-map.h (hash_map::empty_zero_p): Likewise, using the value
from Traits.
* hash-set-tests.c (value_hash_traits::empty_zero_p): Likewise.
* hash-table.h (hash_table::alloc_entries): Guard the loop of
calls to mark_empty with !Descriptor::empty_zero_p.
(hash_table::empty_slow): Conditionalize the memset call with a
check that Descriptor::empty_zero_p; otherwise, loop through the
entries calling mark_empty on them.
* hash-traits.h (int_hash::empty_zero_p): New static constant.
(pointer_hash::empty_zero_p): Likewise.
(pair_hash::empty_zero_p): Likewise.
* ipa-devirt.c (default_hash_traits <type_pair>::empty_zero_p):
Likewise.
* ipa-prop.c (ipa_bit_ggc_hash_traits::empty_zero_p): Likewise.
(ipa_vr_ggc_hash_traits::empty_zero_p): Likewise.
* profile.c (location_triplet_hash::empty_zero_p): Likewise.
* sanopt.c (sanopt_tree_triplet_hash::empty_zero_p): Likewise.
(sanopt_tree_couple_hash::empty_zero_p): Likewise.
* tree-hasher.h (int_tree_hasher::empty_zero_p): Likewise.
* tree-ssa-sccvn.c (vn_ssa_aux_hasher::empty_zero_p): Likewise.
* tree-vect-slp.c (bst_traits::empty_zero_p): Likewise.
* tree-vectorizer.h
(default_hash_traits<scalar_cond_masked_key>::empty_zero_p):
Likewise.

PR c++/92594 - ICE with inherited trivial default ctor.

Here we were getting confused about whether or not pod_tuple has a trivial
default constructor.  bar inherits the trivial e default constructor; the
effect of calling that inherited constructor is equivalent to calling a
defaulted default constructor in bar, so let's treat it as such.

* method.c (trivial_fn_p): Treat an inherited default constructor
like a normal default constructor.

PR c++/92009 - ICE with punning of typeid.

There were two issues in this PR:

1) We were crashing in is_really_empty_class because we say that the
internal RTTI types are classes, but never gave them TYPE_BINFO.

2) We were allowing the cast to a different pointer type because STRIP_NOPS
in cxx_fold_indirect_ref ignored REINTERPRET_CAST_P.

* rtti.c (get_tinfo_desc): Call xref_basetypes.
* constexpr.c (cxx_fold_indirect_ref): Don't strip
REINTERPRET_CAST_P.

Fix dejagnu pruning of constexpr context messages.

I wonder why nobody fixed this until now; it's been two years since the
diagnostic context output was changed.

* lib/prune.exp (prune_gcc_output): Adjust constexpr pattern.

The mentioned auto-generated file is no more part of the

GCC sources, it's auto-generated in $(builddir) during build.

PR target/92055
* contrib/gcc_update (files_and_dependencies): Remove
entry for gcc/config/avr/t-multilib.

Typo.

libgcc/
* config/avr/lib1funcs.S (skip): Simplify.

PR middle-end/93246 - missing alias subsets

Starting with the introduction of TYPE_TYPELESS_STORAGE the situation
of having a alias-set zero aggregate field became more common which
prevents recording alias-sets of fields of said aggregate as subset
of the outer aggregate.  component_uses_parent_alias_set_from in the
past fended off some of the issues with that but the alias oracles
use of the alias set of the base of an access path never appropriately
handled it.

The following makes it so that alias-sets of fields of alias-set zero
aggregate fields are still recorded as subset of the container.

2020-01-14  Richard Biener  <rguenther@suse.de>

PR middle-end/93246
* alias.c (record_component_aliases): Take superset to record
into, recurse for alias-set zero fields.
(record_component_aliases): New oveerload wrapping around the above.

* g++.dg/torture/pr93246.C: New testcase.

Fix typo and avoid possible memory leak in average_num_loop_insns

Function average_num_loop_insns forgets to free loop body in early
return.  Besides, overflow comparison checks 1000000 (e6) but the
return value is 100000 (e5), fix this typo.

gcc/ChangeLog

2020-01-14  Kewen Lin  <linkw@gcc.gnu.org>

    * cfgloopanal.c (average_num_loop_insns): Free bbs when early
    return, fix typo on return value.

PR c++/92746 - ICE with noexcept of function concept check.

Another place that needs to specially handle Concepts TS function-style
concepts.

* except.c (check_noexcept_r): Handle concept-check.

PR c++/92582 - ICE with member template as requirement.

Here, we weren't recognizing that the template parameter of A is used by the
reference to d in the requires-clause of f.  Fixed by passing down the
active template parameters in the context of normalization, and adding to
the mapping any such parameters shared by a member template used in the
constraint-expression.

* pt.c (struct find_template_parameter_info): Add ctx_parms.
(any_template_parm_r): Handle TEMPLATE_DECL.
(find_template_parameters): Take parms instead of their depth.
* constraint.cc (build_parameter_mapping): Pass them.

Missed function specialization + partial devirtualization

v8:
 1. Rebase to master with Martin's static function (r280043) comments merge.
    Boostrap/testsuite/SPEC2017 tested pass on Power8-LE.
 2. TODO:
    2.1. C++ devirt for multiple speculative call targets.
    2.2. ipa-icf ipa_merge_profiles refine with COMDAT inline testcase.

This patch aims to fix PR69678 caused by PGO indirect call profiling
performance issues.
The bug that profiling data is never working was fixed by Martin's pull
back of topN patches, performance got GEOMEAN ~1% improvement(+24% for
511.povray_r specifically).
Still, currently the default profile only generates SINGLE indirect target
that called more than 75%.  This patch leverages MULTIPLE indirect
targets use in LTO-WPA and LTO-LTRANS stage, as a result, function
specialization, profiling, partial devirtualization, inlining and
cloning could be done successfully based on it.
Performance can get improved from 0.70 sec to 0.38 sec on simple tests.
Details are:
  1.  PGO with topn is enabled by default now, but only one indirect
  target edge will be generated in ipa-profile pass, so add variables to enable
  multiple speculative edges through passes, speculative_id will record the
  direct edge index bind to the indirect edge, indirect_call_targets length
  records how many direct edges owned by the indirect edge, postpone gimple_ic
  to ipa-profile like default as inline pass will decide whether it is benefit
  to transform indirect call.
  2.  Use speculative_id to track and search the reference node matched
  with the direct edge's callee for multiple targets.  Actually, it is the
  caller's responsibility to handle the direct edges mapped to same indirect
  edge.  speculative_call_info will return one of the direct edge specified,
  this will leverage current IPA edge process framework mostly.
  3.  Enable LTO WPA/LTRANS stage multiple indirect call targets analysis for
  profile full support in ipa passes and cgraph_edge functions.  speculative_id
  can be set by make_speculative id when multiple targets are binded to
  one indirect edge, and cloned if new edge is cloned.  speculative_id
  is streamed out and stream int by lto like lto_stmt_uid.
  4.  Create and duplicate all speculative direct edge's call summary
  in ipa-fnsummary.c with auto_vec.
  5.  Add 1 in module testcase and 2 cross module testcases.
  6.  Bootstrap and regression test passed on Power8-LE.  No function
  and performance regression for SPEC2017.

gcc/ChangeLog

2020-01-14  Xiong Hu Luo  <luoxhu@linux.ibm.com>

PR ipa/69678
* cgraph.c (symbol_table::create_edge): Init speculative_id and
target_prob.
(cgraph_edge::make_speculative): Add param for setting speculative_id
and target_prob.
(cgraph_edge::speculative_call_info): Update comments and find reference
by speculative_id for multiple indirect targets.
(cgraph_edge::resolve_speculation): Decrease the speculations
for indirect edge, drop it's speculative if not direct target
left. Update comments.
(cgraph_edge::redirect_call_stmt_to_callee): Likewise.
(cgraph_node::dump): Print num_speculative_call_targets.
(cgraph_node::verify_node): Don't report error if speculative
edge not include statement.
(cgraph_edge::num_speculative_call_targets_p): New function.
* cgraph.h (int common_target_id): Remove.
(int common_target_probability): Remove.
(num_speculative_call_targets): New variable.
(make_speculative): Add param for setting speculative_id.
(cgraph_edge::num_speculative_call_targets_p): New declare.
(target_prob): New variable.
(speculative_id): New variable.
* ipa-fnsummary.c (analyze_function_body): Create and duplicate
  call summaries for multiple speculative call targets.
* cgraphclones.c (cgraph_node::create_clone): Clone speculative_id.
* ipa-profile.c (struct speculative_call_target): New struct.
(class speculative_call_summary): New class.
(class speculative_call_summaries): New class.
(call_sums): New variable.
(ipa_profile_generate_summary): Generate indirect multiple targets summaries.
(ipa_profile_write_edge_summary): New function.
(ipa_profile_write_summary): Stream out indirect multiple targets summaries.
(ipa_profile_dump_all_summaries): New function.
(ipa_profile_read_edge_summary): New function.
(ipa_profile_read_summary_section): New function.
(ipa_profile_read_summary): Stream in indirect multiple targets summaries.
(ipa_profile): Generate num_speculative_call_targets from
profile summaries.
* ipa-ref.h (speculative_id): New variable.
* ipa-utils.c (ipa_merge_profiles): Update with target_prob.
* lto-cgraph.c (lto_output_edge): Remove indirect common_target_id and
common_target_probability.   Stream out speculative_id and
num_speculative_call_targets.
(input_edge): Likewise.
* predict.c (dump_prediction): Remove edges count assert to be
precise.
* symtab.c (symtab_node::create_reference): Init speculative_id.
(symtab_node::clone_references): Clone speculative_id.
(symtab_node::clone_referring): Clone speculative_id.
(symtab_node::clone_reference): Clone speculative_id.
(symtab_node::clear_stmts_in_references): Clear speculative_id.
* tree-inline.c (copy_bb): Duplicate all the speculative edges
if indirect call contains multiple speculative targets.
* value-prof.h  (check_ic_target): Remove.
* value-prof.c  (gimple_value_profile_transformations):
Use void function gimple_ic_transform.
* value-prof.c  (gimple_ic_transform): Handle topn case.
Fix comment typos.  Change it to a void function.

gcc/testsuite/ChangeLog

2020-01-14  Xiong Hu Luo  <luoxhu@linux.ibm.com>

PR ipa/69678
* gcc.dg/tree-prof/indir-call-prof-topn.c: New testcase.
* gcc.dg/tree-prof/crossmodule-indir-call-topn-1.c: New testcase.
* gcc.dg/tree-prof/crossmodule-indir-call-topn-1a.c: New testcase.
* gcc.dg/tree-prof/crossmodule-indir-call-topn-2.c: New testcase.
* lib/scandump.exp: Dump executable file name.
* lib/scanwpaipa.exp: New scan-pgo-wap-ipa-dump.

Daily bump.

Add initial octeontx2 support.

This adds octeontx2 naming.  It currently uses the cortexa57
cost model and schedule model until I submit this.  This is
more a place holder to get the naming of the cores in GCC 10.
I will submit the cost model in the next couple of days.

ChangeLog:
* config/aarch64/aarch64-cores.def (octeontx2): New define.
(octeontx2t98): New define.
(octeontx2t96): New define.
(octeontx2t93): New define.
(octeontx2f95): New define.
(octeontx2f95n): New define.
(octeontx2f95mm): New define.
* config/aarch64/aarch64-tune.md: Regenerate.
* doc/invoke.texi (-mcpu=): Document the new cpu types.

Replace update_web_docs_libstdcxx_svn with update_web_docs_libstdcxx_git

This patch replaces the update_web_docs_libstdcxx_svn script, that
updates online documentation from its sources in the GCC repository, run
once a day from cron, with update_web_docs_libstdcxx_git.

* update_web_docs_libstdcxx_git: New file.
* update_web_docs_libstdcxx_svn: Remove.
* crontab: Use update_web_docs_libstdcxx_git.

testsuite: remove unused dg-line directive

gcc/testsuite/ChangeLog:
* gcc.dg/plugin/diagnostic-test-paths-2.c: Remove unused dg-line
directive.

MAINTAINERS: Update my email address.

Revert "contrib: Add in the default push rule which was overridden"

This reverts commit b60563a8bf18b5a49431b5913f32f5c5ff8319d9.

Doesn't work as expected.

contrib: Add in the default push rule which was overridden

When we add a push rule, the default rule gets removed, so add that in
explicitly.  This needs to come last since otherwise it would match
the custom redirecting rules we have for personal and vendor
sub-spaces.

I also noticed that the push rule for the vendor subspace still had
a force push default.  We don't want that so remove it.

* gcc-git-customization.sh: Add back the default rule that
is lost by adding a custom push rule.
* git-fetch-vendor.sh: Likewise, also remove '+' from push specs.

IPA: Avoid segfault in devirtualization_time_bonus (PR 93223)

2020-01-13  Martin Jambor  <mjambor@suse.cz>

PR ipa/93223
* ipa-cp.c (devirtualization_time_bonus): Check whether isummary is
NULL.

testsuite/
* g++.dg/ipa/pr93223.C: New test.

PR c++/80265 - constexpr __builtin_mem*.

The library has already worked around this issue, but I was curious about
why it wasn't working.  The answer: because we were passing &var to fold,
which doesn't know about the constexpr values hash table.  Fixed by passing
&"str" instead.

* constexpr.c (cxx_eval_builtin_function_call): Expose STRING_CST
to str/mem builtins.

PR c++/33799 - destroy return value if local cleanup throws.

This is a pretty rare situation since the C++11 change to make all
destructors default to noexcept, but it is still possible to define throwing
destructors, and if a destructor for a local variable throws during the
return, we've already constructed the return value, so now we need to
destroy it.  I handled this somewhat like the new-expression cleanup; as in
that case, this cleanup can't properly nest with the cleanups for local
variables, so I introduce a cleanup region around the whole function and a
flag variable to indicate whether the return value actually needs to be
destroyed.

Setting the flag requires giving a COMPOUND_EXPR as the operand of a
RETURN_EXPR, so I adjust gimplify_return_expr to handle that.

This doesn't currently work with deduced return type because we don't know
the type when we're deciding whether to introduce the cleanup region.

gcc/
* gimplify.c (gimplify_return_expr): Handle COMPOUND_EXPR.
gcc/cp/
* cp-tree.h (current_retval_sentinel): New macro.
* decl.c (start_preparsed_function): Set up cleanup for retval.
* typeck.c (check_return_expr): Set current_retval_sentinel.

PR c++/93238 - short right-shift with enum.

My earlier patch to reintroduce short_shift failed to adjust for the C++
front end use of const_op1 rather than op1.

* typeck.c (cp_build_binary_op): Use folded op1 for short_shift.

Replace update_web_docs_svn with update_web_docs_git.

This patch replaces the update_web_docs_svn script, that updates
online documentation from its sources in the GCC repository, run once
a day from cron, with update_web_docs_git.

* update_web_docs_git: New file.
* update_web_docs_svn: Remove.
* crontab: Use update_web_docs_svn.

Fix typo in invoke.texi.

Fix handling of overflow in C casts in integer constant expressions (PR c/93241).

Bug 93241 reports a case where certain C expressions involving casts,
that would not be valid in an evaluated part of an integer constant
expression (because of e.g. involving integer overflow), are wrongly
rejected in an unevaluated part of an integer constant expression even
though all the operands and operations are ones that are valid in that
context.  This is a rejects-valid regression in GCC 4.5 and later
relative to 4.4 (for some testcases; the one in the bug uses
_Static_assert which isn't supported in those older releases).

The rule in the C front end is that an expression with those
properties (valid in an unevaluated part of an integer constant
expression but not an evaluated part) must be represented either as an
INTEGER_CST with TREE_OVERFLOW set or as a C_MAYBE_CONST_EXPR with
C_MAYBE_CONST_EXPR_INT_OPERANDS set.  This patch fixes build_c_cast to
check for that case and call note_integer_operands as needed.

Bootstrapped with no regressions for x86_64-pc-linux-gnu.

PR c/93241
gcc/c:
* c-typeck.c (build_c_cast): Check for expressions with integer
operands that can occur in an unevaluated part of an integer
constant expression and call note_integer_operands as needed.

gcc/testsuite:
* gcc.dg/c11-static-assert-10.c, gcc.dg/c99-const-expr-15.c: New
tests.

contrib: script to setup git to pull a vendors branches

This simple script is intended to setup a new git configuration to
pull the branches and tags for a specific vendor.  This should
simplify some of the steps needed for working with a vendor's
branches.

* git-fetch-vendor.sh: New file.

contrib: Add git gcc-descr and gcc-undescr aliases.

2020-01-13  Jakub Jelinek  <jakub@redhat.com>

* contrib/gcc-git-customization.sh: Add git gcc-descr and gcc-undescr
aliases.

contrib: Add script to help with customizing a git checkout for use with GCC

This patch is intended to help with folks setting up a git work
environment for use with GCC following the transition to git.  It
currently does a couple of things.

1) Add an alias 'svn-rev' to git so that you can look up a legacy
commit by its svn revision number.  This enables you to type
git svn-rev 1234
and git will show the commit log entry relating to SVN r1234.

2) Sets up tracking information for the user's personal area in
the git repo.  It tries to figure out some sensible answers to the
data it needs, but allows the user to override the values.  It then
creates the fetch and push entries that are needed for tracking the
extra refs. This implements one part of the recommendations that I've
proposed in svnwrite.html for dealing with private branches.

It should be possible to run the script more than once and for it to
DTRT.  If you change your answers the configuration should be
correctly updated.

2020-01-13  Richard Earnshaw  <rearnsha@arm.com>

    * gcc-git-customization: New file.

Remove usage of legacy param_ipa_cp_unit_growth.

* ipa-cp.c (get_max_overall_size): Use newly
renamed param param_ipa_cp_unit_growth.
* params.opt: Remove legacy param name.

PR tree-optimization/93213 - wrong code with -Og -foptimize-strlen

gcc/testsuite/ChangeLog:

PR tree-optimization/93213
* gcc.c-torture/execute/pr93213.c: New test.

gcc/ChangeLog:

PR tree-optimization/93213
* tree-ssa-strlen.c (handle_store): Only allow single-byte nul-over-nul
stores to be eliminated.

Exclude CL_WARNING and CL_PARAM from --help=optimize.

2020-01-13  Martin Liska  <mliska@suse.cz>

* opts.c (print_help): Do not print CL_PARAM
and CL_WARNING for CL_OPTIMIZATION.