Maciej W. Rozycki [Sat, 5 Dec 2020 18:26:25 +0000 (18:26 +0000)]
VAX: Provide the `ctz' operation
Our `ffssi2_internal' pattern and the machine FFS instruction, which
technically is a bit-field operation, match the `ctz' operation exactly,
with the result produced for the bit-field source operand of zero equal
to its width as specified with another machine instruction operand, not
directly expressed in RTL and currently hardcoded in the assembly code
produced. In our terms this is the bit size of the machine mode used,
and although it's SImode now let's be flexible for an upcoming change.
The operation also sets the Z condition code according to the value of
the source operand.
gcc/
* config/vax/builtins.md (ffssi2_internal): Rename insn to...
(ctzsi2): ... this. Update the RTL operation.
(ffssi2): Update accordingly.
* config/vax/vax.c (vax_notice_update_cc): Handle CTZ.
* config/vax/vax.h (CTZ_DEFINED_VALUE_AT_ZERO): New macro.
gcc/testsuite/
* gcc.target/vax/ctzsi.c: New test.
Maciej W. Rozycki [Sat, 5 Dec 2020 18:26:25 +0000 (18:26 +0000)]
VAX: Add tests for `sync_lock_test_and_set' and `sync_lock_release'
Based on gcc.dg/pr61756.c.
gcc/testsuite/
* gcc.target/vax/bbcci.c: New test.
* gcc.target/vax/bbssi.c: New test.
Maciej W. Rozycki [Sat, 5 Dec 2020 18:26:25 +0000 (18:26 +0000)]
VAX: Add a test for the SImode `ffs' operation
gcc/testsuite/
* gcc.target/vax/ffssi.c: New test.
Maciej W. Rozycki [Sat, 5 Dec 2020 18:26:25 +0000 (18:26 +0000)]
VAX: Actually enable `builtins.md' now that it is fully functional
Test cases will follow.
gcc/
* config/vax/vax.md: Include `builtins.md'.
Maciej W. Rozycki [Sat, 5 Dec 2020 18:26:25 +0000 (18:26 +0000)]
VAX: Correct `sync_lock_test_and_set' and `sync_lock_release' builtins
Remove an ICE like:
during RTL pass: expand
.../libatomic/tas_n.c: In function 'libat_test_and_set_1':
.../libatomic/tas_n.c:39:1: internal compiler error: in patch_jump_insn, at cfgrtl.c:1298
39 | }
| ^
0x108a09ff patch_jump_insn
.../gcc/cfgrtl.c:1298
0x108a0b07 redirect_branch_edge
.../gcc/cfgrtl.c:1325
0x108a124b rtl_redirect_edge_and_branch
.../gcc/cfgrtl.c:1458
0x1087f6d3 redirect_edge_and_branch(edge_def*, basic_block_def*)
.../gcc/cfghooks.c:373
0x11d6264b try_forward_edges
.../gcc/cfgcleanup.c:562
0x11d6b0eb try_optimize_cfg
.../gcc/cfgcleanup.c:2960
0x11d6ba4f cleanup_cfg(int)
.../gcc/cfgcleanup.c:3174
0x10870b3f execute
.../gcc/cfgexpand.c:6763
triggered with an RTL pattern like:
(jump_insn 8 7 20 2 (parallel [
(set (pc)
(if_then_else (ne (zero_extract:SI (mem/v:QI (mem/f/c:SI (reg/f:SI 16 virtual-incoming-args) [1 mptr+0 S4 A32]) [-1 S1 A8])
(const_int 1 [0x1])
(const_int 0 [0]))
(const_int 0 [0]))
(label_ref 10)
(pc)))
(set (zero_extract:SI (mem/v:QI (mem/f/c:SI (reg/f:SI 16 virtual-incoming-args) [1 mptr+0 S4 A32]) [-1 S1 A8])
(const_int 1 [0x1])
(const_int 0 [0]))
(const_int 1 [0x1]))
]) ".../libatomic/tas_n.c":38:12 -1
(nil)
-> 10)
caused by a volatile memory reference used that is not accepted by the
`memory_operand' predicate of the `jbbssiqi' insn explicitly referred
from the `sync_lock_test_and_setqi' expander. Also seen with:
FAIL: gcc.dg/pr61756.c (internal compiler error)
Define a new `any_memory_operand' predicate accepting both ordinary and
volatile memory references and use it with the `jbb<ccss>i<mode>' insn,
so as to address the ICE.
Also remove useless operations from the `sync_lock_test_and_set<mode>'
and `sync_lock_release<mode>' expanders as those always either complete
or fail and therefore never fall through to using their template other
than to match operands. Wrap `jbb<ccss>i<mode>' into `unspec_volatile'
instead so that the jump does not get removed or reordered. Share one
index to avoid a complication around the iterators since the index is
nowhere referred to anyway and the pattern required pulled by its name.
Test cases will be added separately.
gcc/
* config/vax/predicates.md (volatile_mem_operand)
(any_memory_operand): New predicates.
* config/vax/builtins.md (VUNSPEC_UNLOCK): Remove constant.
(sync_lock_test_and_set<mode>): Remove `set' and `unspec'
operations, match operands only. Reformat.
(sync_lock_release<mode>): Likewise. Remove cruft.
(jbb<ccss>i<mode>): Wrap into `unspec_volatile', use
`any_memory_operand' predicate.
Maciej W. Rozycki [Sat, 5 Dec 2020 18:26:25 +0000 (18:26 +0000)]
VAX: Use an int iterator to produce individual interlocked branches
With mode-specific interlocked branch insns already folded into iterated
templates now fold the two templates into one too, observing that the
only difference between them is the value of the bit branched on, which
is of course reflected both in the RTL expression and the instruction
produced. Use an int iterator to iterate over the bit value, making use
of the newly-added wide integer support, and substituting patterns as
necessary to produce equivalent individual insns. No functional change.
gcc/
* config/vax/builtins.md (bit): New int iterator.
(ccss): New int attribute.
(jbbssi<mode>, jbbcci<mode>): Fold insns into...
(jbb<ccss>i<mode>): ... this.
Maciej W. Rozycki [Sat, 5 Dec 2020 18:26:25 +0000 (18:26 +0000)]
VAX: Use a mode iterator to produce individual interlocked branches
Regardless of the machine mode all the interlocked branches of the same
kind, one of the two provided by the ISA, use the same RTL patterns and
machine instructions, except for the memory operand's constraint.
Remove code duplication then and make use of a mode iterator combined
with an attribute to expand the same insn patterns with the constraint
suitably substituted from a single template. No functional change.
gcc/
* config/vax/builtins.md (bb_mem): New mode attribute.
(jbbssiqi, jbbssihi, jbbssisi): Fold insns into...
(jbbssi<mode>): ... this.
(jbbcciqi, jbbccihi, jbbccisi): Likewise...
(jbbcci<mode>): ... this.
Maciej W. Rozycki [Sat, 5 Dec 2020 18:26:25 +0000 (18:26 +0000)]
jump: Also handle jumps wrapped in UNSPEC or UNSPEC_VOLATILE
VAX has interlocked branch instructions used for atomic operations and
we want to have them wrapped in UNSPEC_VOLATILE so as not to have code
carried across. This however breaks with jump optimization and leads
to an ICE in the build of libbacktrace like:
.../libbacktrace/mmap.c:190:1: internal compiler error: in fixup_reorder_chain, at cfgrtl.c:3934
190 | }
| ^
0x1087d46b fixup_reorder_chain
.../gcc/cfgrtl.c:3934
0x1087f29f cfg_layout_finalize()
.../gcc/cfgrtl.c:4447
0x1087c74f execute
.../gcc/cfgrtl.c:3662
on RTL like:
(jump_insn 18 17 150 4 (unspec_volatile [
(set (pc)
(if_then_else (eq (zero_extract:SI (mem/v:SI (reg/f:SI 23 [ _2 ]) [-1 S4 A32])
(const_int 1 [0x1])
(const_int 0 [0]))
(const_int 1 [0x1]))
(label_ref 20)
(pc)))
(set (zero_extract:SI (mem/v:SI (reg/f:SI 23 [ _2 ]) [-1 S4 A32])
(const_int 1 [0x1])
(const_int 0 [0]))
(const_int 1 [0x1]))
] 101) ".../libbacktrace/mmap.c":135:14 158 {jbbssisi}
(nil)
-> 20)
when those branches are enabled with a follow-up change. Also showing
with:
FAIL: gcc.dg/pr61756.c (internal compiler error)
Handle branches wrapped in UNSPEC_VOLATILE then and, for consistency,
also in UNSPEC. The presence of UNSPEC_VOLATILE will prevent such
branches from being removed as they won't be accepted by `onlyjump_p',
we just need to let them through.
gcc/
* jump.c (pc_set): Also accept a jump wrapped in UNSPEC or
UNSPEC_VOLATILE.
(any_uncondjump_p, any_condjump_p): Update comment accordingly.
Maciej W. Rozycki [Sat, 5 Dec 2020 18:26:25 +0000 (18:26 +0000)]
loop-doloop: Add missing call to `onlyjump_p'
Keep any jump that has side effects as those must not be removed.
gcc/
* loop-doloop.c (add_test): Only remove the jump if `onlyjump_p'.
Maciej W. Rozycki [Sat, 5 Dec 2020 18:26:24 +0000 (18:26 +0000)]
cfgrtl: Add missing call to `onlyjump_p'
If any unconditional jumps within a block have side effects then the
block cannot be considered empty.
gcc/
* cfgrtl.c (rtl_block_empty_p): Return false if `!onlyjump_p'
too.
Maciej W. Rozycki [Sat, 5 Dec 2020 18:26:24 +0000 (18:26 +0000)]
sel-sched-ir: Add missing call to `onlyjump_p'
Do not try to remove a conditional jump if it has side effects.
gcc/
* sel-sched-ir.c (maybe_tidy_empty_bb): Only try to remove a
conditional jump if `onlyjump_p'.
Maciej W. Rozycki [Sat, 5 Dec 2020 18:26:24 +0000 (18:26 +0000)]
loop-iv: Add missing calls to `onlyjump_p'
Ignore jumps that have side effects in loop processing as pasting the
body of a loop multiple times within is semantically equivalent to jump
deletion (between the iterations unrolled) even if we do not physically
delete the jump RTL insn.
gcc/
* loop-iv.c (simplify_using_initial_values): Only process jumps
that match `onlyjump_p'.
(check_simple_exit): Likewise.
Maciej W. Rozycki [Sat, 5 Dec 2020 18:26:24 +0000 (18:26 +0000)]
ifcvt: Add missing call to `onlyjump_p'
Do not convert a conditional jump into conditional execution (and remove
the jump as a consequence) if the jump has side effects.
gcc/
* ifcvt.c (dead_or_predicable) [!IFCVT_MODIFY_TESTS]: Bail out
if `!onlyjump_p'.
Maciej W. Rozycki [Sat, 5 Dec 2020 18:26:24 +0000 (18:26 +0000)]
RTL: Also support HOST_WIDE_INT with int iterators
Add wide integer aka 'w' rtx format support to int iterators so that
machine description can iterate over `const_int' expressions.
This is made by expanding standard integer aka 'i' format support,
observing that any standard integer already present in any of our
existing RTL code will also fit into HOST_WIDE_INT, so there is no need
for a separate handler. Any truncation of the number parsed is made by
the caller. An assumption is made however that no place relies on
capping out of range values to INT_MAX.
Now the 'p' format is handled explicitly rather than being implied by
rtx being a SUBREG, so actually assert that it is, just to play safe.
gcc/
* read-rtl.c: Add a page-feed separator at the start of iterator
code.
(struct iterator_group): Change the return type to HOST_WIDE_INT
for the `find_builtin' member. Likewise the second parameter
type for the `apply_iterator' member.
(atoll) [!HAVE_ATOQ]: Reorder.
(find_mode, find_code): Change the return type to HOST_WIDE_INT.
(apply_mode_iterator, apply_code_iterator)
(apply_subst_iterator): Change the second parameter type to
HOST_WIDE_INT.
(find_int): Handle input suitable for HOST_WIDE_INT output.
(apply_int_iterator): Rewrite in terms of explicit format
interpretation.
(rtx_reader::read_rtx_operand) <'w'>: Fold into...
<'i', 'n', 'p'>: ... this.
* doc/md.texi (Int Iterators): Document 'w' rtx format support.
Maciej W. Rozycki [Sat, 5 Dec 2020 18:26:24 +0000 (18:26 +0000)]
VAX: Correct fatal issues with the `ffs' builtin
The `builtins.md' machine description fragment is not included anywhere
and is therefore dead code, which has become bitrotten due to non-use.
If actually enabled, it does not build due to the use of an unknown `t'
constraint:
.../gcc/config/vax/builtins.md:42:1: error: undefined machine-specific constraint at this point: "t"
.../gcc/config/vax/builtins.md:42:1: note: in operand 1
which came from commit
becb93d02cc1 ("builtins.md (ffssi2_internal):
Correct constraint."), which was not applied as posted and reviewed; `T'
was meant to be used instead.
Once this has been fixed this code still fails building:
.../gcc/config/vax/builtins.md: In function 'rtx_def* gen_ffssi2(rtx, rtx)':
.../gcc/config/vax/builtins.md:35:19: error: 'gen_bne' was not declared in this
scope; did you mean 'gen_use'?
35 | emit_jump_insn (gen_bne (label));
| ^~~~~~~
| gen_use
make[2]: *** [Makefile:1122: insn-emit.o] Error 1
Finally the FFS machine instruction sets the Z condition code according
to the comparison of the value held in the source operand against zero
rather than the value held in the target operand. If the source operand
is found hold zero, then the target operand is set to the width of the
source operand, 32 for SImode (FFS supports arbitrary widths).
Correct the build issues then and update RTL to match the operation of
the machine instruction. A test case will be added separately.
gcc/
* config/vax/builtins.md (ffssi2): Make preparation statements
actually buildable.
(ffssi2_internal): Fix input constraints; make the RTL pattern
match reality for `cc0'.
Maciej W. Rozycki [Sat, 5 Dec 2020 18:26:24 +0000 (18:26 +0000)]
VAX: Rationalize expression and address costs
Expression costs are required to be given in terms of COSTS_N_INSNS (n),
which is defined to stand for the count of single fast instructions, and
actually returns `n * 4'. The VAX backend however instead operates on
naked numbers, causing an anomaly for the integer const zero rtx, where
the cost given is 4 as opposed to 1 for integers in the [1:63] range, as
well as -1 for comparisons. This is because the value of 0 returned by
`vax_rtx_costs' is converted to COSTS_N_INSNS (1) in `pattern_cost':
return cost > 0 ? cost : COSTS_N_INSNS (1);
Consequently, where feasible, 1 or -1 are preferred over 0 by the middle
end causing code pessimization, e.g. rather than producing this:
subl2 $4,%sp
movl 4(%ap),%r0
jgtr .L2
addl2 $2,%r0
.L2:
ret
or this:
subl2 $4,%sp
addl3 4(%ap),8(%ap),%r0
jlss .L6
addl2 $2,%r0
.L6:
ret
code is produced like this:
subl2 $4,%sp
movl 4(%ap),%r0
cmpl %r0,$1
jgeq .L2
addl2 $2,%r0
.L2:
ret
or this:
subl2 $4,%sp
addl3 4(%ap),8(%ap),%r0
cmpl %r0,$-1
jleq .L6
addl2 $2,%r0
.L6:
ret
from this:
int
compare_mov (int x)
{
if (x > 0)
return x;
else
return x + 2;
}
and this:
int
compare_add (int x, int y)
{
int z;
z = x + y;
if (z < 0)
return z;
else
return z + 2;
}
respectively, which is slower and larger both at a time.
Furthermore once the backend is converted to MODE_CC this anomaly makes
it usually impossible to remove redundant comparisons in the comparison
elimination pass, because most VAX instructions set the condition codes
as per the relation of the instruction's result to 0 and not -1.
The middle end has some other assumptions as to rtx costs being given in
terms of COSTS_N_INSNS, so wrap all the VAX rtx costs then as they stand
into COSTS_N_INSNS invocations, effectively scaling the costs by 4 while
preserving their relative values, except for the integer const zero rtx
given the value of `COSTS_N_INSNS (1) / 2', half of a fast instruction
(this can be further halved if needed in the future).
Adjust address costs likewise so that they remain proportional to the
new absolute values of rtx costs.
Code size stats are as follows, collected from 17639 executables built
in `check-c' GCC testing:
samples average median
--------------------------------------
regressions 1420 0.400% 0.195%
unchanged 13811 0.000% 0.000%
progressions 2408 -0.504% -0.201%
--------------------------------------
total 17639 -0.037% 0.000%
with a small number of outliers only (over 5% size change):
old new change %change filename
----------------------------------------------------
4991 5249 258 5.1693 981001-1.exe
2637 2777 140 5.3090 interchange-6.exe
2187 2307 120 5.4869 sprintf.x7
3969 4197 228 5.7445 pr28982a.exe
8264 8816 552 6.6795 vector-compare-1.exe
5199 5575 376 7.2321 pr28982b.exe
2113 2411 298 14.1031
20030323-1.exe
2113 2411 298 14.1031
20030323-1.exe
2113 2411 298 14.1031
20030323-1.exe
so it seems we are looking good, and we have complementing reductions
to compensate:
old new change %change filename
----------------------------------------------------
2919 2631 -288 -9.8663 pr57521.exe
3427 3167 -260 -7.5868 sabd_1.exe
2985 2765 -220 -7.3701 ssad-run.exe
2985 2765 -220 -7.3701 ssad-run.exe
2985 2765 -220 -7.3701 usad-run.exe
2985 2765 -220 -7.3701 usad-run.exe
4509 4253 -256 -5.6775 vshuf-v2sf.exe
4541 4285 -256 -5.6375 vshuf-v2si.exe
4673 4417 -256 -5.4782 vshuf-v2df.exe
2993 2841 -152 -5.0785 abs-2.x4
2993 2841 -152 -5.0785 abs-3.x4
This actually causes `loop-8.c' to regress:
FAIL: gcc.dg/loop-8.c scan-rtl-dump-times loop2_invariant "Decided" 1
FAIL: gcc.dg/loop-8.c scan-rtl-dump-not loop2_invariant "without introducing a new temporary register"
but upon a closer inspection this is a red herring. Old code looks as
follows:
.file "loop-8.c"
.text
.align 1
.globl f
.type f, @function
f:
.word 0
subl2 $4,%sp
movl 4(%ap),%r2
movl 8(%ap),%r3
movl $42,(%r2)
clrl %r0
movl $42,%r1
movl %r1,%r4
jbr .L2
.L5:
movl %r4,%r1
.L2:
movl %r1,(%r3)[%r0]
incl %r0
cmpl %r0,$100
jeql .L6
movl $42,(%r2)[%r0]
bicl3 $-2,%r0,%r1
jeql .L5
movl %r0,%r1
jbr .L2
.L6:
ret
.size f, .-f
while new one is like below:
.file "loop-8.c"
.text
.align 1
.globl f
.type f, @function
f:
.word 0
subl2 $4,%sp
movl 4(%ap),%r2
movl $42,(%r2)+
movl 8(%ap),%r1
clrl %r0
movl $42,%r3
movzbl $100,%r4
movl %r3,%r5
jbr .L2
.L5:
movl %r5,%r3
.L2:
movl %r3,(%r1)+
incl %r0
cmpl %r0,%r4
jeql .L6
movl $42,(%r2)+
bicl3 $-2,%r0,%r3
jeql .L5
movl %r0,%r3
jbr .L2
.L6:
ret
.size f, .-f
and is clearly better: not only it is smaller, but it also uses the
post-increment rather than indexed addressing mode in the loop, of
which the former comes for free in terms of both performance and code
size while the latter causes an extra byte per operand to be produced
for the index register and also incurs an execution penalty for the
extra address calculation.
Exclude the case from VAX testing then, as already done for some other
targets and discussed with commit
d242fdaec186 ("gcc.dg/loop-8.c: Skip
for mmix.").
gcc/
* config/vax/vax.c (vax_address_cost): Express the cost in terms
of COSTS_N_INSNS.
(vax_rtx_costs): Likewise.
gcc/testsuite/
* gcc.dg/loop-8.c: Exclude for `vax-*-*'.
* gcc.target/vax/compare-add-zero.c: New test.
* gcc.target/vax/compare-mov-zero.c: New test.
Maciej W. Rozycki [Sat, 5 Dec 2020 18:26:24 +0000 (18:26 +0000)]
VAX/testsuite: Run target testing over all the usual optimization levels
It makes sense to use what other targets do and run all the VAX test
cases over all the usual optimization levels, so make `vax.exp' use our
`gcc-dg-runtest' rather than the generic `dg-runtest' test driver.
This breaks `pr56875.c' however, which is optimized away at levels above
`-O0' as a result of how it has been written for calculations to make no
effect:
FAIL: gcc.target/vax/pr56875.c -O1 scan-assembler ashq .*,\\$0xffffffffffffffff,
FAIL: gcc.target/vax/pr56875.c -O2 scan-assembler ashq .*,\\$0xffffffffffffffff,
FAIL: gcc.target/vax/pr56875.c -O3 -g scan-assembler ashq .*,\\$0xffffffffffffffff,
FAIL: gcc.target/vax/pr56875.c -Os scan-assembler ashq .*,\\$0xffffffffffffffff,
FAIL: gcc.target/vax/pr56875.c -O2 -flto -fno-use-linker-plugin -flto-partition=none scan-assembler ashq .*,\\$0xffffffffffffffff,
FAIL: gcc.target/vax/pr56875.c -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects scan-assembler ashq .*,\\$0xffffffffffffffff,
Rather than keeping it at `-O0' update the test case for its code to do
make effect while retaining its sense. Also reformat it according to
our requirements.
gcc/testsuite/
* gcc.target/vax/vax.exp: Use `gcc-dg-runtest' rather than
`dg-runtest'.
* gcc.target/vax/pr56875.c (dg-options): Make empty.
(a): Rewrite for calculations to make effect. Reformat.
Maciej W. Rozycki [Sat, 5 Dec 2020 18:26:24 +0000 (18:26 +0000)]
VAX: Define LEGITIMATE_PIC_OPERAND_P
The VAX ELF psABI does not permit the use of all hardware operand modes
for PIC symbol references due to the need to use PC-relative addressing
for symbols that end up local and the need to make references indirect
symbols that end up global.
Therefore symbols referred as immediates may only be used with the move
and push address (MOVA and PUSHA) instructions and their PC-relative
displacement address mode, as there is no genuine PC-relative immediate
available that all the other instructions would have to use.
Furthermore global symbol references must not have an offset applied,
which has to be added with a separate instruction, because there is no
support now for GOT entries for external `symbol+offset' references, so
any indirect GOT references made by the static linker from the original
direct symbol references must not have an addend applied. Consequently
no addend is allowed even if a given external symbol turns out local,
for whatever reason, at the static link time.
Define the LEGITIMATE_PIC_OPERAND_P macro then, a corresponding function
and predicate to exclude the relevant expressions as required, and then
a constraint so that reloads are produced where needed, and use the new
facilities in the machine description, folding corresponding duplicated
patterns for local and external symbols together. Rewrite predicates to
make use of the new function, rename them to match their sense and also
remove ones no longer used.
All this fixing an ICE like this:
during RTL pass: postreload
.../gcc/testsuite/gcc.c-torture/execute/
20040709-2.c: In function 'testE':
.../gcc/testsuite/gcc.c-torture/execute/
20040709-2.c:89:1: internal compiler error: in reload_combine_note_use, at postreload.c:1559
.../gcc/testsuite/gcc.c-torture/execute/
20040709-2.c:96:65: note: in expansion of macro 'T'
0x10fe84cb reload_combine_note_use
.../gcc/postreload.c:1559
0x10fe8857 reload_combine_note_use
.../gcc/postreload.c:1621
0x10fe8303 reload_combine_note_use
.../gcc/postreload.c:1517
0x10fe7c7b reload_combine
.../gcc/postreload.c:1408
0x10fe3417 reload_cse_regs
.../gcc/postreload.c:67
0x10feaf9f execute
.../gcc/postreload.c:2358
due to the presence of a pseudo register post-reload:
(insn 435 228 229 13 (set (reg:SI 1 %r1)
(mem/c:SI (reg/f:SI 341) [25 sE+12 S4 A8])) ".../gcc/testsuite/gcc.c-torture/execute/
20040709-2.c":96:65 12 {movsi_2}
(nil))
(due to the use of an offset `sE+12' symbol reference) and removing
these regressions:
FAIL: gcc.c-torture/execute/
20040709-2.c -O2 (internal compiler error)
FAIL: gcc.c-torture/execute/
20040709-2.c -O2 (test for excess errors)
FAIL: gcc.c-torture/execute/
20040709-2.c -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions (internal compiler error)
FAIL: gcc.c-torture/execute/
20040709-2.c -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions (test for excess errors)
FAIL: gcc.c-torture/execute/
20040709-2.c -O3 -g (internal compiler error)
FAIL: gcc.c-torture/execute/
20040709-2.c -O3 -g (test for excess errors)
FAIL: gcc.c-torture/execute/
20040709-2.c -Os (internal compiler error)
FAIL: gcc.c-torture/execute/
20040709-2.c -Os (test for excess errors)
FAIL: gcc.c-torture/execute/
20040709-2.c -O2 -flto -fno-use-linker-plugin -flto-partition=none (internal compiler error)
FAIL: gcc.c-torture/execute/
20040709-2.c -O2 -flto -fno-use-linker-plugin -flto-partition=none (test for excess errors)
FAIL: gcc.c-torture/execute/
20040709-3.c -O2 (internal compiler error)
FAIL: gcc.c-torture/execute/
20040709-3.c -O2 (test for excess errors)
FAIL: gcc.c-torture/execute/
20040709-3.c -O3 -g (internal compiler error)
FAIL: gcc.c-torture/execute/
20040709-3.c -O3 -g (test for excess errors)
FAIL: gcc.c-torture/execute/
20040709-3.c -Os (internal compiler error)
FAIL: gcc.c-torture/execute/
20040709-3.c -Os (test for excess errors)
FAIL: gcc.c-torture/execute/
20040709-3.c -O2 -flto -fno-use-linker-plugin -flto-partition=none (internal compiler error)
FAIL: gcc.c-torture/execute/
20040709-3.c -O2 -flto -fno-use-linker-plugin -flto-partition=none (test for excess errors)
FAIL: gcc.dg/torture/pr52028.c -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects (internal compiler error)
FAIL: gcc.dg/torture/pr52028.c -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects (test for excess errors)
gcc/
* config/vax/constraints.md (A): New constraint.
* config/vax/predicates.md (external_symbolic_operand)
(external_const_operand): Remove predicates.
(local_symbolic_operand): Rename to...
(pic_symbolic_operand): ... this, and rework.
(external_memory_operand): Rename to...
(non_pic_external_memory_operand): ... this, and rework.
(illegal_blk_memory_operand, illegal_addsub_di_memory_operand):
Update accordingly.
* config/vax/vax-protos.h (vax_acceptable_pic_operand_p): New
prototype.
* config/vax/vax.c (vax_acceptable_pic_operand_p): New function.
(vax_output_int_add): Update according to predicate rework.
* config/vax/vax.h (LEGITIMATE_PIC_OPERAND_P): New macro.
* config/vax/vax.md (pushlclsymreg, pushextsymreg): Fold
together, and rename to...
(*pushsymreg): ... this. Use the `pic_symbolic_operand'
predicate and the `A' constraint for the displacement operand.
(movlclsymreg, movextsymreg): Fold together, and rename to...
(*movsymreg): ... this. Use the `pic_symbolic_operand'
predicate and the `A' constraint for the displacement operand.
(pushextsym, pushlclsym): Fold together, and rename to...
(*pushsym): ... this. Use the `pic_symbolic_operand' predicate
and the `A' constraint for the displacement operand.
(movextsym, movlclsym): Fold together, and rename to...
(*movsym): ... this. Use the `pic_symbolic_operand' predicate
and the `A' constraint for the displacement operand.
Maciej W. Rozycki [Sat, 5 Dec 2020 18:26:24 +0000 (18:26 +0000)]
VAX: Remove `c' operand format specifier overload
The `c' operand format specifier is handled directly by the middle end
in `output_asm_insn':
%cN means require operand N to be a constant
and print the constant expression with no punctuation.
however it resorts to the target for constants that are not valid
addresses:
else if (letter == 'c')
{
if (CONSTANT_ADDRESS_P (operands[opnum]))
output_addr_const (asm_out_file, operands[opnum]);
else
output_operand (operands[opnum], 'c');
}
The VAX backend expects the fallback never to happen and overloads `c'
with the branch condition code. This is confusing however and it is not
like we are short of letters, so instead make the branch condition code
use `k', and then for consistency make `K' the reverse branch condition
code format specifier. This is safe to do as we provide no means to use
a computed branch condition code in user `asm'.
gcc/
* config/vax/vax.c (print_operand): Replace `c' and `C' with
`k' and `K' respectively.
* config/vax/vax.md (*branch, *branch_reversed): Update
accordingly.
Matt Thomas [Sat, 5 Dec 2020 18:26:23 +0000 (18:26 +0000)]
PR target/58901: reload: Handle SUBREG of MEM with a mode-dependent address
Fix an ICE with the handling of RTL expressions like:
(subreg:QI (mem/c:SI (plus:SI (plus:SI (mult:SI (reg/v:SI 0 %r0 [orig:67 i ] [67])
(const_int 4 [0x4]))
(reg/v/f:SI 7 %r7 [orig:59 doacross ] [59]))
(const_int 40 [0x28])) [1 MEM[(unsigned int *)doacross_63 + 40B + i_106 * 4]+0 S4 A32]) 0)
that causes the compilation of libgomp to fail:
during RTL pass: reload
.../libgomp/ordered.c: In function 'GOMP_doacross_wait':
.../libgomp/ordered.c:507:1: internal compiler error: in change_address_1, at emit-rtl.c:2275
507 | }
| ^
0x10a3462b change_address_1
.../gcc/emit-rtl.c:2275
0x10a353a7 adjust_address_1(rtx_def*, machine_mode, poly_int<1u, long>, int, int, int, poly_int<1u, long>)
.../gcc/emit-rtl.c:2409
0x10ae2993 alter_subreg(rtx_def**, bool)
.../gcc/final.c:3368
0x10ae25cf cleanup_subreg_operands(rtx_insn*)
.../gcc/final.c:3322
0x110922a3 reload(rtx_insn*, int)
.../gcc/reload1.c:1232
0x10de2bf7 do_reload
.../gcc/ira.c:5812
0x10de3377 execute
.../gcc/ira.c:5986
in a `vax-netbsdelf' build, where an attempt is made to change the mode
of the contained memory reference to the mode of the containing SUBREG.
Such RTL expressions are produced by the VAX shift and rotate patterns
(`ashift', `ashiftrt', `rotate', `rotatert') where the count operand
always has the QI mode regardless of the mode, either SI or DI, of the
datum shifted or rotated.
Such a mode change cannot work where the memory reference uses the
indexed addressing mode, where a multiplier is implied that in the VAX
ISA depends on the width of the memory access requested and therefore
changing the machine mode would change the address calculation as well.
Avoid the attempt then by forcing the reload of any SUBREGs containing
a mode-dependent memory reference, also fixing these regressions:
FAIL: gcc.c-torture/compile/pr46883.c -Os (internal compiler error)
FAIL: gcc.c-torture/compile/pr46883.c -Os (test for excess errors)
FAIL: gcc.c-torture/execute/
20120808-1.c -O2 (internal compiler error)
FAIL: gcc.c-torture/execute/
20120808-1.c -O2 (test for excess errors)
FAIL: gcc.c-torture/execute/
20120808-1.c -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions (internal compiler error)
FAIL: gcc.c-torture/execute/
20120808-1.c -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions (test for excess errors)
FAIL: gcc.c-torture/execute/
20120808-1.c -O3 -g (internal compiler error)
FAIL: gcc.c-torture/execute/
20120808-1.c -O3 -g (test for excess errors)
FAIL: gcc.c-torture/execute/
20120808-1.c -O2 -flto -fno-use-linker-plugin -flto-partition=none (internal compiler error)
FAIL: gcc.c-torture/execute/
20120808-1.c -O2 -flto -fno-use-linker-plugin -flto-partition=none (test for excess errors)
FAIL: gcc.c-torture/execute/
20120808-1.c -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects (internal compiler error)
FAIL: gcc.c-torture/execute/
20120808-1.c -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects (test for excess errors)
FAIL: gcc.dg/
20050629-1.c (internal compiler error)
FAIL: gcc.dg/
20050629-1.c (test for excess errors)
FAIL: c-c++-common/torture/pr53505.c -Os (internal compiler error)
FAIL: c-c++-common/torture/pr53505.c -Os (test for excess errors)
FAIL: gfortran.dg/coarray_failed_images_1.f08 -Os (internal compiler error)
FAIL: gfortran.dg/coarray_stopped_images_1.f08 -Os (internal compiler error)
With test case #0 included it causes a reload with:
(insn 15 14 16 4 (set (reg:SI 31)
(ashift:SI (const_int 1 [0x1])
(subreg:QI (reg:SI 30 [ MEM[(int *)s_8(D) + 4B + _5 * 4] ]) 0))) "pr58901-0.c":15:12 94 {ashlsi3}
(expr_list:REG_DEAD (reg:SI 30 [ MEM[(int *)s_8(D) + 4B + _5 * 4] ])
(nil)))
as follows:
Reloads for insn # 15
Reload 0: reload_in (SI) = (reg:SI 30 [ MEM[(int *)s_8(D) + 4B + _5 * 4] ])
ALL_REGS, RELOAD_FOR_INPUT (opnum = 2)
reload_in_reg: (reg:SI 30 [ MEM[(int *)s_8(D) + 4B + _5 * 4] ])
reload_reg_rtx: (reg:SI 5 %r5)
resulting in:
(insn 37 14 15 4 (set (reg:SI 5 %r5)
(mem/c:SI (plus:SI (plus:SI (mult:SI (reg/v:SI 1 %r1 [orig:25 i ] [25])
(const_int 4 [0x4]))
(reg/v/f:SI 4 %r4 [orig:29 s ] [29]))
(const_int 4 [0x4])) [1 MEM[(int *)s_8(D) + 4B + _5 * 4]+0 S4 A32])) "pr58901-0.c":15:12 12 {movsi_2}
(nil))
(insn 15 37 16 4 (set (reg:SI 2 %r2 [31])
(ashift:SI (const_int 1 [0x1])
(reg:QI 5 %r5))) "pr58901-0.c":15:12 94 {ashlsi3}
(nil))
and assembly like:
.L3:
movl 4(%r4)[%r1],%r5
ashl %r5,$1,%r2
xorl2 %r2,%r0
incl %r1
cmpl %r1,%r3
jneq .L3
produced for the loop, providing optimization has been enabled.
Likewise with test case #1 the reload of:
(insn 17 16 18 4 (set (reg:SI 34)
(and:SI (subreg:SI (reg/v:DI 27 [ t ]) 4)
(const_int 1 [0x1]))) "pr58901-1.c":18:20 77 {*andsi_const_int}
(expr_list:REG_DEAD (reg/v:DI 27 [ t ])
(nil)))
is as follows:
Reloads for insn # 17
Reload 0: reload_in (DI) = (reg/v:DI 27 [ t ])
reload_out (SI) = (reg:SI 2 %r2 [34])
ALL_REGS, RELOAD_OTHER (opnum = 0)
reload_in_reg: (reg/v:DI 27 [ t ])
reload_out_reg: (reg:SI 2 %r2 [34])
reload_reg_rtx: (reg:DI 4 %r4)
resulting in:
(insn 40 16 17 4 (set (reg:DI 4 %r4)
(mem/c:DI (plus:SI (mult:SI (reg/v:SI 1 %r1 [orig:26 i ] [26])
(const_int 8 [0x8]))
(reg/v/f:SI 3 %r3 [orig:30 s ] [30])) [1 MEM[(const struct s *)s_13(D) + _7 * 8]+0 S8 A32])) "pr58901-1.c":18:20 11 {movdi}
(nil))
(insn 17 40 41 4 (set (reg:SI 4 %r4)
(and:SI (reg:SI 5 %r5 [+4 ])
(const_int 1 [0x1]))) "pr58901-1.c":18:20 77 {*andsi_const_int}
(nil))
and assembly like:
.L3:
movq (%r3)[%r1],%r4
bicl3 $-2,%r5,%r4
addl2 %r4,%r0
jaoblss %r0,%r1,.L3
First posted at: <https://gcc.gnu.org/ml/gcc/2014-06/msg00060.html>.
2020-12-05 Matt Thomas <matt@3am-software.com>
Maciej W. Rozycki <macro@linux-mips.org>
gcc/
PR target/58901
* reload.c (push_reload): Also reload the inner expression of a
SUBREG for pseudos associated with a mode-dependent memory
reference.
(find_reloads): Force a reload likewise.
2020-12-05 Maciej W. Rozycki <macro@linux-mips.org>
gcc/testsuite/
PR target/58901
* gcc.c-torture/compile/pr58901-0.c: New test.
* gcc.c-torture/compile/pr58901-1.c: New test.
Roman Zhuykov [Sat, 5 Dec 2020 15:45:27 +0000 (18:45 +0300)]
modulo-sched: Carefully process loop counter initialization [PR97421]
Do not allow direct adjustment of pre-header initialization instruction for
count register if is read in some instruction below in that basic block.
gcc/ChangeLog:
PR rtl-optimization/97421
* modulo-sched.c (generate_prolog_epilog): Remove forward
declaration, adjust last argument name and type.
(const_iteration_count): Add bool pointer parameter to return
whether count register is read in pre-header after its
initialization.
(sms_schedule): Fix count register initialization adjustment
procedure according to what const_iteration_count said.
gcc/testsuite/ChangeLog:
PR rtl-optimization/97421
* gcc.c-torture/execute/pr97421-1.c: New test.
* gcc.c-torture/execute/pr97421-2.c: New test.
* gcc.c-torture/execute/pr97421-3.c: New test.
Paul Thomas [Sat, 5 Dec 2020 14:14:19 +0000 (14:14 +0000)]
Fortran: flag formal argument before resolving an array spec [PR98016].
2020-12-05 Paul Thomas <pault@gcc.gnu.org>
gcc/fortran
PR fortran/98016
* resolve.c (resolve_symbol): Set formal_arg_flag before
resolving an array spec and restore value afterwards.
gcc/testsuite/
PR fortran/98016
* gfortran.dg/pr98016.f90: New test.
Iain Sandoe [Wed, 18 Nov 2020 10:06:03 +0000 (10:06 +0000)]
Darwin : Update libtool and dependencies for Darwin20 [PR97865]
The change in major version (and the increment from Darwin19 to 20)
caused libtool tests to fail which resulted in incorrect build settings
for shared libraries.
We take this opportunity to sort out the shared undefined symbols state
rather than propagating the current unsound behaviour into a new rev.
This change means that we default to the case that missing symbols are
considered an error, and if one wants to allow this intentionally, the
confiuration for that case should be set appropriately.
Three existing cases need undefined dynamic lookup:
libitm, where there is already a configuration mechanism to add the
flags.
libcc1, where we add simple configuration to add the flags for Darwin.
libsanitizer, where we can add to the existing extra flags.
libcc1/ChangeLog:
PR target/97865
* Makefile.am: Add dynamic_lookup to LD flags for Darwin.
* configure.ac: Test for Darwin host and set a flag.
* Makefile.in: Regenerate.
* configure: Regenerate.
libitm/ChangeLog:
PR target/97865
* configure.tgt: Add dynamic_lookup to XLDFLAGS for Darwin.
* configure: Regenerate.
libsanitizer/ChangeLog:
PR target/97865
* configure.tgt: Add dynamic_lookup to EXTRA_CXXFLAGS for
Darwin.
* configure: Regenerate.
ChangeLog:
PR target/97865
* libtool.m4: Update handling of Darwin platform link flags
for Darwin20.
gcc/ChangeLog:
PR target/97865
* configure: Regenerate.
libatomic/ChangeLog:
PR target/97865
* configure: Regenerate.
libbacktrace/ChangeLog:
PR target/97865
* configure: Regenerate.
libffi/ChangeLog:
PR target/97865
* configure: Regenerate.
libgfortran/ChangeLog:
PR target/97865
* configure: Regenerate.
libgomp/ChangeLog:
PR target/97865
* configure: Regenerate.
libhsail-rt/ChangeLog:
PR target/97865
* configure: Regenerate.
libobjc/ChangeLog:
PR target/97865
* configure: Regenerate.
libphobos/ChangeLog:
PR target/97865
* configure: Regenerate.
libquadmath/ChangeLog:
PR target/97865
* configure: Regenerate.
libssp/ChangeLog:
PR target/97865
* configure: Regenerate.
libstdc++-v3/ChangeLog:
PR target/97865
* configure: Regenerate.
libvtv/ChangeLog:
PR target/97865
* configure: Regenerate.
zlib/ChangeLog:
PR target/97865
* configure: Regenerate.
Venkataramanan Kumar [Sat, 5 Dec 2020 05:42:15 +0000 (11:12 +0530)]
X86_64: Enable support for next generation AMD Zen3 CPU.
2020-12-03 Venkataramanan Kumar <Venkataramanan.Kumar@amd.com>
Sharavan Kumar <Shravan.Kumar@amd.com>
gcc/ChangeLog:
* common/config/i386/cpuinfo.h (get_amd_cpu) recognize znver3.
* common/config/i386/i386-common.c (processor_names): Add
znver3.
(processor_alias_table): Add znver3 and AMDFAM19H entry.
* common/config/i386/i386-cpuinfo.h (processor_types): Add
AMDFAM19H.
(processor_subtypes): AMDFAM19H_ZNVER3.
* config.gcc (i[34567]86-*-linux* | ...): Likewise.
* config/i386/driver-i386.c: (host_detect_local_cpu): Let
-march=native recognize znver3 processors.
* config/i386/i386-c.c (ix86_target_macros_internal): Add
znver3.
* config/i386/i386-options.c (m_znver3): New definition.
(m_ZNVER): Include m_znver3.
(processor_cost_table): Add znver3.
* config/i386/i386.c (ix86_reassociation_width): Likewise.
* config/i386/i386.h (TARGET_znver3): New definition.
(enum processor_type): Add PROCESSOR_ZNVER3.
* config/i386/i386.md (define_attr "cpu"): Add znver3.
* config/i386/x86-tune-sched.c: (ix86_issue_rate): Likewise.
(ix86_adjust_cost): Likewise.
* config/i386/x86-tune.def (X86_TUNE_AVOID_256FMA_CHAINS:
Likewise.
* config/i386/znver1.md: Add new reservations for znver3.
* doc/extend.texi: Add details about znver3.
* doc/invoke.texi: Likewise.
gcc/testsuite/ChangeLog:
* gcc.target/i386/funcspec-56.inc: Handle new march.
* g++.target/i386/mv29.C: New file.
Jakub Jelinek [Sat, 5 Dec 2020 00:31:08 +0000 (01:31 +0100)]
i386: Combine splitters followup [PR96226]
Here is the patch to simplify the newly added combine splitters,
when we split into 2 insns anyway, no reason to split into the masking
define_insn_and_split we'd be splitting shortly after.
2020-12-05 Jakub Jelinek <jakub@redhat.com>
PR target/96226
* config/i386/i386.md (splitter after *<rotate_insn><mode>3_mask,
splitter after *<rotate_insn><mode>3_mask_1): Drop the masking from
the patterns to split into.
Jakub Jelinek [Sat, 5 Dec 2020 00:30:08 +0000 (01:30 +0100)]
c++: Fix constexpr access to union member through pointer-to-member [PR98122]
We currently incorrectly reject the first testcase, because
cxx_fold_indirect_ref_1 doesn't attempt to handle UNION_TYPEs.
As the second testcase shows, it isn't that easy, because I believe we need
to take into account the active member and prefer that active member over
other members, because if we pick a non-active one, we might reject valid
programs.
2020-12-05 Jakub Jelinek <jakub@redhat.com>
PR c++/98122
* constexpr.c (cxx_union_active_member): New function.
(cxx_fold_indirect_ref_1): Add ctx argument, pass it through to
recursive call. Handle UNION_TYPE.
(cxx_fold_indirect_ref): Add ctx argument, pass it to recursive calls
and cxx_fold_indirect_ref_1.
(cxx_eval_indirect_ref): Adjust cxx_fold_indirect_ref calls.
* g++.dg/cpp1y/constexpr-98122.C: New test.
* g++.dg/cpp2a/constexpr-98122.C: New test.
GCC Administrator [Sat, 5 Dec 2020 00:16:39 +0000 (00:16 +0000)]
Daily bump.
Ian Lance Taylor [Fri, 4 Dec 2020 19:34:50 +0000 (11:34 -0800)]
runtime: update type descriptor name in fieldtrack C support code
We were using the old name, but nothing noticed because it is a weak
reference that is permitted to be nil, so that it works with code that
does not use the field tracking library.
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/275449
Jason Merrill [Wed, 25 Nov 2020 22:05:24 +0000 (17:05 -0500)]
c++: Fix deduction from auto template parameter [PR93083]
The check in do_class_deduction to handle passing one class placeholder
template parm as an argument for itself needed to be extended to also handle
equivalent parms from other templates.
gcc/cp/ChangeLog:
PR c++/93083
* pt.c (convert_template_argument): Handle equivalent placeholders.
(do_class_deduction): Look through EXPR_PACK_EXPANSION, too.
gcc/testsuite/ChangeLog:
PR c++/93083
* g++.dg/cpp2a/nontype-class40.C: New test.
Jason Merrill [Wed, 2 Dec 2020 22:11:33 +0000 (17:11 -0500)]
vec: Simplify use with C++11 range-based 'for'.
It looks cleaner if we can use a vec* directly as a range for the C++11
range-based 'for' loop, without needing to indirect from it, and also works
with null pointers.
The change in cp_parser_late_parsing_default_args is an example of how this
can be used to simplify a simple loop over a vector. Reverse or subset
iteration will require adding range adaptors.
I deliberately didn't format the new overloads for etags since they are
trivial.
gcc/ChangeLog:
* vec.h (begin, end): Add overloads for vec*.
* tree.c (build_constructor_from_vec): Remove *.
gcc/cp/ChangeLog:
* decl2.c (clear_consteval_vfns): Remove *.
* pt.c (do_auto_deduction): Remove *.
* parser.c (cp_parser_late_parsing_default_args): Change loop
to use range 'for'.
David Edelsohn [Fri, 4 Dec 2020 19:29:46 +0000 (14:29 -0500)]
rs6000: fix PTR_SIZE in rs6000.c
The recent change to rs6000.c for DWARF in AIX references the macro
PTR_SIZE that only is defined in dwarf2out.c. This patch changes the
reference to the equivalent POINTER_SIZE_UNITS defined in defaults.h.
gcc/ChangeLog:
* config/rs6000/rs6000.c (rs6000_option_override_internal):
Change PTR_SIZE to POINTER_SIZE_UNITS.
Hans-Peter Nilsson [Fri, 4 Dec 2020 19:27:23 +0000 (20:27 +0100)]
doc/implement-c.texi: About same-as-scalar-type volatile aggregate accesses, PR94600
We say very little about reads and writes to aggregate /
compound objects, just scalar objects (i.e. assignments don't
cause reads). Let's lets say something safe about aggregate
objects, but only for those that are the same size as a scalar
type.
There's an equal-sounding section (Volatiles) in extend.texi,
but this seems a more appropriate place, as specifying the
behavior of a standard qualifier.
gcc:
2020-12-04 Hans-Peter Nilsson <hp@axis.com>
Martin Sebor <msebor@redhat.com>
PR middle-end/94600
* doc/implement-c.texi (Qualifiers implementation): Add blurb
about access to the whole of a volatile aggregate object, only for
same-size as a scalar object.
Jakub Jelinek [Fri, 4 Dec 2020 18:10:56 +0000 (19:10 +0100)]
gimple: Return fnspec only for replaceable new/delete operators called from new/delete [PR98130]
As mentioned in the PR, we shouldn't treat non-replaceable operator
new/delete (e.g. with the placement new) as replaceable ones.
There is some pending discussion that perhaps operator delete called from
delete if not replaceable should return some other fnspec, but can we handle
that incrementally, fix this wrong-code and then deal with a missed
optimization? I really don't know what exactly should be returned.
2020-12-04 Jakub Jelinek <jakub@redhat.com>
PR c++/98130
* gimple.c (gimple_call_fnspec): Only return ".co " for replaceable
operator delete or ".mC" for replaceable operator new called from
new/delete.
* g++.dg/opt/pr98130.C: New test.
Jakub Jelinek [Fri, 4 Dec 2020 17:44:31 +0000 (18:44 +0100)]
i386: Add combine splitters to allow combining multiple insns into reg1 = const; reg2 = rotate (reg1, reg3 & cst) [PR96226]
As mentioned in the PR, we can combine ~(1 << x) into -2 r<< x, but we give
up in the ~(1 << (x & 31)) cases, as *<rotate_insn><mode>3_mask* don't allow
immediate operand 1 and find_split_point prefers to split (x & 31) instead
of the constant.
With these combine splitters we help combine decide how to split those
insns.
2020-12-04 Jakub Jelinek <jakub@redhat.com>
PR target/96226
* config/i386/i386.md (splitter after *<rotate_insn><mode>3_mask,
splitter after *<rotate_insn><mode>3_mask_1): New combine splitters.
* gcc.target/i386/pr96226.c: New test.
Jakub Jelinek [Fri, 4 Dec 2020 17:00:54 +0000 (18:00 +0100)]
fold-const: Don't use build_constructor for non-aggregate types in native_encode_initializer [PR93121]
The following testcase is rejected, because when trying to encode a zeroing
CONSTRUCTOR, the code was using build_constructor to build initializers for
the elements but when recursing the function handles CONSTRUCTOR only for
aggregate types.
The following patch fixes that by using build_zero_cst instead for
non-aggregates. Another option would be add handling CONSTRUCTOR for
non-aggregates in native_encode_initializer. Or we can do both, I guess
the middle-end generally doesn't like CONSTRUCTORs for scalar variables, but
am not 100% sure if the FE doesn't produce those sometimes.
2020-12-04 Jakub Jelinek <jakub@redhat.com>
PR libstdc++/93121
* fold-const.c (native_encode_initializer): Use build_zero_cst
instead of build_constructor.
* g++.dg/cpp2a/bit-cast6.C: New test.
Nathan Sidwell [Fri, 4 Dec 2020 16:34:41 +0000 (08:34 -0800)]
c++: Revert dependent-array changes [PR 98116]
The changes reverted here are exposing an existing problem with alias
template comparisons. The typename_type changes are also incomplete,
possibly for similar reasons. It seems safer to revert them, fix the
underlying issue and then move forwards.
The testcases is adjusted to more robustly check the specialization
table, and ICEs with and without the c++ changes.
Revert:
62fb1b9e0da c++: Fix array type dependency [PR 98107]
07589ca2b2c c++: typename_type structural comparison
29ae1d7751 c++: Extend build_array_type API
PR c++/98116
gcc/cp/
* cp-tree.h (comparing_typenames): Delete.
(cplus_build_array_type): Remove default parm.
* pt.c (comparing_typenames): Delete.
(spec_hasher::equal): Don't increment it.
* tree.c (set_array_type_canon): Remove dep parm.
(build_cplus_array_type): Remove dep parm changes.
(cp_build_qualified_type_real): Remove dependent array type
changes.
(strip_typedefs): Likewise.
* typeck.c (structural_comptypes): Revert comparing_typename
changes.
gcc/testsuite/
* g++.dg/template/pr98116.C: Enable robust checking.
Nathan Sidwell [Fri, 4 Dec 2020 13:20:27 +0000 (05:20 -0800)]
c++: Module API declarations
This provides the inline predicates about module state, and declares
the functions to be provided.
gcc/cp/
* cp-tree.h: Add various inline module state predicates, and
declare the API that will be provided by modules.cc
Jakub Jelinek [Fri, 4 Dec 2020 11:18:21 +0000 (12:18 +0100)]
debug: Fix another vector DECL_MODE ICE [PR98100]
The PR88587 fix changes DECL_MODE of vars with vector type during inlining/cloning
when the vars are copied, so that their DECL_MODE matches their TYPE_MODE in
the new function. Unfortunately, the following testcase still ICEs, the var
isn't really used in the new function and so it isn't copied, but becomes
just a nonlocalized var. So we can't adjust its DECL_MODE because it
appears in multiple functions and needs different modes in between them.
The following patch changes the DEBUG_INSN creation to use TYPE_MODE instead
of DECL_MODE for vars with vector types.
2020-12-04 Jakub Jelinek <jakub@redhat.com>
PR target/98100
* cfgexpand.c (expand_gimple_basic_block): For vars with
vector type, use TYPE_MODE rather than DECL_MODE.
* gcc.target/i386/pr98100.c: New test.
Jakub Jelinek [Fri, 4 Dec 2020 09:54:45 +0000 (10:54 +0100)]
dwarf: Add -gdwarf{32,64} options
The following patch makes the choice between 32-bit and 64-bit DWARF formats
selectable by command line switch, rather than being hardcoded through
DWARF_OFFSET_SIZE macro.
The options themselves don't turn on debug info themselves, so one needs
to use -g -gdwarf64 or similar.
2020-12-04 Jakub Jelinek <jakub@redhat.com>
* common.opt (-gdwarf32, -gdwarf64): New options.
* config/rs6000/rs6000.c (rs6000_option_override_internal): Default
dwarf_offset_size to 8 if not overridden from the command line.
* dwarf2out.c: Change all occurrences of DWARF_OFFSET_SIZE to
dwarf_offset_size.
* doc/invoke.texi (-gdwarf32, -gdwarf64): Document.
Martin Liska [Fri, 4 Dec 2020 09:43:51 +0000 (10:43 +0100)]
testsuite: use param for if-to-switch tests
gcc/testsuite/ChangeLog:
PR testsuite/98123
* gcc.dg/tree-ssa/if-to-switch-4.c: Add param to make the test
stable on all architectures.
* gcc.dg/tree-ssa/if-to-switch-6.c: Likewise.
* gcc.dg/tree-ssa/if-to-switch-8.c: Likewise.
Eric Botcazou [Fri, 4 Dec 2020 09:26:53 +0000 (10:26 +0100)]
Add target selector to gcc.dg/pr98099.c
gcc/testsuite/ChangeLog:
* gcc.dg/pr98099.c: Compile only for dfp targets.
Martin Liska [Mon, 23 Nov 2020 12:40:04 +0000 (13:40 +0100)]
Refactor -frecord-gcc-switches.
gcc/ChangeLog:
* doc/tm.texi: Change argument of the record_gcc_switches
hook and remove SWITCH_TYPE_* enum values.
* dwarf2out.c (gen_producer_string): Move to opts.c and remove
handling of the dwarf_record_gcc_switches option.
(dwarf2out_early_finish): Use moved gen_producer_string
function.
* opts.c (gen_producer_string): New.
* opts.h (gen_producer_string): New.
* target.def: Change type of record_gcc_switches.
* target.h (enum print_switch_type): Remove.
(elf_record_gcc_switches): Change first argument.
* toplev.c (MAX_LINE): Remove.
(print_to_asm_out_file): Likewise.
(print_to_stderr): Likewise.
(print_single_switch): Likewise.
(print_switch_values): Likewise.
(init_asm_output): Use new gen_producer_string function.
(process_options): Likewise.
* varasm.c (elf_record_gcc_switches): Just save the string argument
to the ELF container.
Eric Botcazou [Fri, 4 Dec 2020 09:04:56 +0000 (10:04 +0100)]
Fix checking failure in IPA-SRA
This is a regression present on the mainline and 10 branch: on the one
hand, IPA-SRA does *not* disqualify accesses with zero size but, on the
other hand, it checks that accesses present in the tree have a (strictly)
positive size, thus trivially yielding an ICE in some cases.
gcc/ChangeLog:
* ipa-sra.c (verify_access_tree_1): Relax assertion on the size.
gcc/testsuite/ChangeLog:
* gnat.dg/opt91.ads, gnat.dg/opt91.adb: New test.
* gnat.dg/opt91_pkg.ads, gnat.dg/opt91_pkg.adb: New helper.
Martin Liska [Fri, 4 Dec 2020 08:36:32 +0000 (09:36 +0100)]
Document missing params.
contrib/ChangeLog:
* check-params-in-docs.py: use flake8 and add some
tweaks to ignore aarch64 params.
gcc/ChangeLog:
* doc/invoke.texi: Add missing params.
Jakub Jelinek [Fri, 4 Dec 2020 07:08:39 +0000 (08:08 +0100)]
c++: Change __builtin_source_location to use __PRETTY_FUNCTION__ instead of __FUNCTION__ [PR80780]
On Tue, Dec 01, 2020 at 01:03:52PM +0000, Jonathan Wakely via Gcc-patches wrote:
> I mentioned in PR 80780 that a __builtin__PRETTY_FUNCTION would have
> been nice, because __FUNCTION__ isn't very useful for C++, because of
> overloading and namespace/class scopes. There are an unlimited number
> of functions that have __FUNCTION__ == "s", e.g. "ns::s(int)" and
> "ns::s()" and "another_scope::s::s<T...>(T...)" etc.
>
> Since __builtin_source_location() can do whatever it wants (without
> needing to add __builtin__PRETTY_FUNCTION) it might be nice to use the
> __PRETTY_FUNCTION__ string. JeanHeyd's tests would still need changes,
> because the name would be "s::s(void*)" not "s::s" but that still
> seems better for users.
When I've added template tests for the previous patch, I have noticed that
the current __builtin_source_location behavior is not really __FUNCTION__,
just close, because e.g. in function template __FUNCTION__ is still
"bar" but __builtin_source_location gave "bar<0>".
Anyway, this patch implements above request to follow __PRETTY_FUNCTION__
(on top of the earlier posted patch).
2020-12-04 Jakub Jelinek <jakub@redhat.com>
PR c++/80780
* cp-gimplify.c (fold_builtin_source_location): Use 2 instead of 0
as last argument to cxx_printable_name.
* g++.dg/cpp2a/srcloc1.C (quux): Use __PRETTY_FUNCTION__ instead of
function.
* g++.dg/cpp2a/srcloc2.C (quux): Likewise.
* g++.dg/cpp2a/srcloc15.C (S::S): Likewise.
(bar): Likewise. Adjust expected column.
* g++.dg/cpp2a/srcloc17.C (S::S): Likewise.
(bar): Likewise. Adjust expected column.
* testsuite/18_support/source_location/1.cc (main): Adjust for
__builtin_source_location using __PRETTY_FUNCTION__-like names instead
__FUNCTION__-like.
* testsuite/18_support/source_location/consteval.cc (main): Likewise.
GCC Administrator [Fri, 4 Dec 2020 00:16:36 +0000 (00:16 +0000)]
Daily bump.
Jason Merrill [Thu, 3 Dec 2020 22:56:45 +0000 (17:56 -0500)]
c++: XFAIL testcase for PR98019
Apparently it isn't actually fixed on trunk yet, was just passing because of
some WIP in my tree. So XFAIL for now.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/concepts-nodiscard1.C: XFAIL.
Jason Merrill [Thu, 3 Dec 2020 21:38:19 +0000 (16:38 -0500)]
c++: Fix bootstrap on 32-bit hosts [PR91828]
Using the releasing_vec op[] with an int index was breaking on 32-bit hosts
because of ambiguity with the built-in operator and the conversion
function. Since the built-in operator has a ptrdiff_t, this was fine on
64-bit targets where ptrdiff_t is larger than int, but broke on 32-bit
targets where it's the same as int, making the conversion for that argument
better than the member function. Fixed by changing the member function to
also use ptrdiff_t for the index.
gcc/cp/ChangeLog:
* cp-tree.h (releasing_vec::operator[]): Change parameter type to
ptrdiff_t.
Martin Sebor [Thu, 3 Dec 2020 22:41:25 +0000 (15:41 -0700)]
Add support for detecting mismatched allocation/deallocation calls.
PR c++/90629 - Support for -Wmismatched-new-delete
PR middle-end/94527 - Add an __attribute__ that marks a function as freeing an object
gcc/ChangeLog:
PR c++/90629
PR middle-end/94527
* builtins.c (access_ref::access_ref): Initialize new member.
(compute_objsize): Use access_ref::deref. Handle simple pointer
assignment.
(expand_builtin): Remove handling of the free built-in.
(call_dealloc_argno): Same.
(find_assignment_location): New function.
(fndecl_alloc_p): Same.
(gimple_call_alloc_p): Same.
(call_dealloc_p): Same.
(matching_alloc_calls_p): Same.
(warn_dealloc_offset): Same.
(maybe_emit_free_warning): Same.
* builtins.h (struct access_ref): Declare new member.
(maybe_emit_free_warning): Make extern. Make use of access_ref.
Handle -Wmismatched-new-delete.
* calls.c (initialize_argument_information): Call
maybe_emit_free_warning.
* doc/extend.texi (attribute malloc): Update.
* doc/invoke.texi (-Wfree-nonheap-object): Expand documentation.
(-Wmismatched-new-delete): Document new option.
(-Wmismatched-dealloc): Document new option.
gcc/c-family/ChangeLog:
PR c++/90629
PR middle-end/94527
* c-attribs.c (handle_dealloc_attribute): New function.
(handle_malloc_attribute): Handle argument forms of attribute.
* c.opt (-Wmismatched-dealloc): New option.
(-Wmismatched-new-delete): New option.
gcc/testsuite/ChangeLog:
PR c++/90629
PR middle-end/94527
* g++.dg/asan/asan_test.cc: Fix a bug.
* g++.dg/warn/delete-array-1.C: Add expected warning.
* g++.old-deja/g++.other/delete2.C: Add expected warning.
* g++.dg/warn/Wfree-nonheap-object-2.C: New test.
* g++.dg/warn/Wfree-nonheap-object.C: New test.
* g++.dg/warn/Wmismatched-new-delete.C: New test.
* g++.dg/warn/Wmismatched-dealloc-2.C: New test.
* g++.dg/warn/Wmismatched-dealloc.C: New test.
* gcc.dg/Wmismatched-dealloc.c: New test.
* gcc.dg/analyzer/malloc-1.c: Prune out expected warning.
* gcc.dg/attr-malloc.c: New test.
* gcc.dg/free-1.c: Adjust text of expected warning.
* gcc.dg/free-2.c: Same.
* gcc.dg/torture/pr71816.c: Prune out expected warning.
* gcc.dg/tree-ssa/pr19831-2.c: Add an expected warning.
* gcc.dg/Wfree-nonheap-object-2.c: New test.
* gcc.dg/Wfree-nonheap-object-3.c: New test.
* gcc.dg/Wfree-nonheap-object.c: New test.
libstdc++-v3/ChangeLog:
* testsuite/ext/vstring/modifiers/clear/56166.cc: Suppress a false
positive warning.
Nathan Sidwell [Thu, 3 Dec 2020 20:38:15 +0000 (12:38 -0800)]
c++: Exported using decls
With modules we need to record whethe a (namespace-scope) using decl
is exporting the named entities. Record this on the OVERLOAD marking
the used decl.
gcc/cp/
* cp-tree.h (OVL_EXPORT): New.
(class ovl_iterator): Add get_using, exporting_p.
* tree.c (ovl_insert): Extend using_or_hidden meaning to include
an exported using.
Nathan Sidwell [Thu, 3 Dec 2020 19:12:08 +0000 (11:12 -0800)]
c++: uninstantiated template friends
template friends need to be recognized by module streaming and
associated with the befriending class. but their context is that of
the friend (a namespace or other class). This adds a flag to mark
such templates, and uses their DECL_CHAIN to point at the befriender.
gcc/cp
* cp-tree.h (DECL_UNINSTANTIATED_TEMPLATE_FRIEND): New.
* pt.c (push_template_decl): Set it.
(tsubst_friend_function): Clear it.
Ian Lance Taylor [Thu, 3 Dec 2020 20:07:04 +0000 (12:07 -0800)]
Go testsuite: update new tests to version in source repo
Michael Meissner [Thu, 3 Dec 2020 19:50:26 +0000 (14:50 -0500)]
PowerPC: PR libgcc/97543 and libgcc/97643, fix long double issues
If you use a compiler with long double defaulting to 64-bit instead of 128-bit
with IBM extended double, you get linker warnings about mis-matches in the gnu
attributes for long double (PR libgcc/97543). Even if the compiler is
configured to have long double be 64 bit as the default with the configuration
option '--without-long-double-128' you get the warnings.
You also get the same issues if you use a compiler with long double defaulting
to IEEE 128-bit instead of IBM extended double (PR libgcc/97643).
The issue is the way libgcc.a/libgcc.so is built. Right now when building
libgcc under Linux, the long double size is set to 128-bits when building
libgcc. However, the gnu attributes are set, leading to the warnings.
One feature of the current GNU attribute implementation is if you have a shared
library (such as libgcc_s.so), the GNU attributes for the shared library is an
inclusive OR of all of the objects within the library. This means if any
object file that uses the -mlong-double-128 option and uses long double, the GNU
attributes for the library will indicate that it uses 128-bit IBM long
doubles. If you have a static library, you will get the warning only if you
actually reference an object file with the attribute set.
This patch does two things:
1) All of the object files that support IBM 128-bit long doubles
explicitly set the ABI to IBM extended double.
2) I turned off GNU attributes for building the shared library or for
building the IBM 128-bit long double support.
libgcc/
2020-12-03 Michael Meissner <meissner@linux.ibm.com>
PR libgcc/97543
PR libgcc/97643
* config/rs6000/t-linux (IBM128_STATIC_OBJS): New make variable.
(IBM128_SHARED_OBJS): New make variable.
(IBM128_OBJS): New make variable. Set all objects to use the
explicit IBM format, and disable gnu attributes.
(IBM128_CFLAGS): New make variable.
(gcc_s_compile): Add -mno-gnu-attribute to all shared library
modules.
Harald Anlauf [Thu, 3 Dec 2020 19:33:22 +0000 (20:33 +0100)]
PR fortran/95342 - ICE in gfc_match_subroutine, at fortran/decl.c:7913
Add checks for NULL pointers before dereferencing them.
gcc/fortran/ChangeLog:
PR fortran/95342
* decl.c (gfc_match_function_decl): Avoid NULL pointer dereference.
(gfc_match_subroutine): Likewise.
gcc/testsuite/ChangeLog:
PR fortran/95342
* gfortran.dg/pr95342.f90: New test.
Jonathan Wakely [Thu, 3 Dec 2020 19:30:02 +0000 (19:30 +0000)]
libstdc++: Fix typos in #error strings
libstdc++-v3/ChangeLog:
* testsuite/26_numerics/bit/bit.cast/bit_cast.cc: Remove stray
word from copy&paste.
* testsuite/26_numerics/bit/bit.cast/version.cc: Likewise.
Alexandre Oliva [Thu, 3 Dec 2020 19:20:28 +0000 (16:20 -0300)]
fix __builtin___clear_cache overrider fallout
Machines that had CLEAR_CACHE_INSN and that would thus issue calls to
__clear_cache with the default call expander, would fail on languages
that did not set up the __clear_cache builtin. This patch arranges
for all languages to set up this builtin.
Machines or multilibs that had ptr_mode != Pmode, such as aarch64 with
-mabi=ilp32, would fail the RTL mode test of the arguments passed to
__clear_cache, because we'd insist on ptr_mode. This patch arranges
for Pmode to be accepted as well.
for gcc/ChangeLog
* tree.c (build_common_builtin_nodes): Declare
__builtin___clear_cache for all languages.
* builtins.c (maybe_emit_call_builtin___clear_cache): Accept
Pmode arguments.
Jonathan Wakely [Thu, 3 Dec 2020 19:17:13 +0000 (19:17 +0000)]
libstdc++: Update C++20 library implementation status
libstdc++-v3/ChangeLog:
* doc/xml/manual/status_cxx2020.xml: Update C++20 status.
* doc/html/*: Regenerate.
JeanHeyd Meneide [Thu, 3 Dec 2020 19:17:13 +0000 (19:17 +0000)]
libtdc++: Define std::source_location for C++20
This doesn't define a new _GLIBCXX_HAVE_BUILTIN_SOURCE_LOCATION macro.
because using __has_builtin(__builtin_source_location) is sufficient.
Currently only GCC supports it, but if/when Clang and Intel add it the
__has_builtin check should for them too.
Co-authored-by: Jonathan Wakely <jwakely@redhat.com>
libstdc++-v3/ChangeLog:
* doc/doxygen/user.cfg.in (INPUT): Add <source_location>.
* include/Makefile.am: Add <source_location>.
* include/Makefile.in: Regenerate.
* include/std/version (__cpp_lib_source_location): Define.
* include/std/source_location: New file.
* testsuite/18_support/source_location/1.cc: New test.
* testsuite/18_support/source_location/consteval.cc: New test.
* testsuite/18_support/source_location/srcloc.h: New test.
* testsuite/18_support/source_location/version.cc: New test.
Jonathan Wakely [Thu, 3 Dec 2020 19:17:13 +0000 (19:17 +0000)]
libstdc++: Add std::bit_cast for C++20 [PR 93121]
Thanks to Jakub's addition of the built-in, we can add this to the
library now. The compiler tests for the built-in are quite extensive,
including verifying the constraints, so this only adds minimal tests to
the library testsuite.
This doesn't add a new _GLIBCXX_HAVE_BUILTIN_BIT_CAST because using
__has_builtin(__builtin_bit_cast) works for GCC and versions of Clang
that provide the built-in.
libstdc++-v3/ChangeLog:
PR libstdc++/93121
* include/std/bit (__cpp_lib_bit_cast, bit_cast): Define.
* include/std/version (__cpp_lib_bit_cast): Define.
* testsuite/26_numerics/bit/bit.cast/bit_cast.cc: New test.
* testsuite/26_numerics/bit/bit.cast/version.cc: New test.
Ian Lance Taylor [Thu, 3 Dec 2020 19:13:03 +0000 (11:13 -0800)]
Go testsuite: add a bunch of new tests from source repo
Ian Lance Taylor [Thu, 3 Dec 2020 19:10:03 +0000 (11:10 -0800)]
go-test.exp: add -I. when compiling in directory
* go.test/go-test.exp (go-gc-tests): Add -I. when building all
sources in a directory (errorcheckdir, compiledir, rundir,
rundircmpout).
Jason Merrill [Thu, 3 Dec 2020 18:55:51 +0000 (13:55 -0500)]
c++: Add testcase for PR98019
This has already been fixed on trunk, but I don't see a testcase for it.
gcc/testsuite/ChangeLog:
PR c++/98019
* g++.dg/cpp2a/concepts-nodiscard1.C: New test.
Ian Lance Taylor [Thu, 3 Dec 2020 18:04:19 +0000 (10:04 -0800)]
testsuite: update existing Go tests to source repo
This updates a bunch of existing Go tests to the contents of the
source repo. This does not add any of the newer tests.
Sebastian Huber [Thu, 3 Dec 2020 08:30:56 +0000 (09:30 +0100)]
RTEMS: Add Cortex-R52 multilib
gcc/
* config/arm/t-rtems: Add "-mthumb -mcpu=cortex-r52
-mfloat-abi=hard" multilib.
Jonathan Wakely [Thu, 3 Dec 2020 17:18:28 +0000 (17:18 +0000)]
libstdc++: Update powerpc-linux baselines for GCC 10.1
This should have been done before the GCC 10.1 release.
libstdc++-v3/ChangeLog:
* config/abi/post/powerpc-linux-gnu/baseline_symbols.txt:
Update.
* config/abi/post/powerpc64-linux-gnu/32/baseline_symbols.txt:
Update.
Jonathan Wakely [Thu, 3 Dec 2020 17:08:01 +0000 (17:08 +0000)]
libstdc++: Disable std::array assertions for C++11 constexpr
The recent changes to add assertions to std::array broke the functions
that need to be constexpr in C++11, because of the restrictive rules for
constexpr functions in C++11.
This simply disables the assertions for C++11 mode, so the functions can
be constexpr again.
libstdc++-v3/ChangeLog:
* include/std/array (array::operator[](size_t) const, array::front() const)
(array::back() const) [__cplusplus == 201103]: Disable
assertions.
* testsuite/23_containers/array/element_access/constexpr_element_access.cc:
Check for correct values.
* testsuite/23_containers/array/tuple_interface/get_neg.cc:
Adjust dg-error line numbers.
* testsuite/23_containers/array/debug/constexpr_c++11.cc: New test.
Nathan Sidwell [Thu, 3 Dec 2020 16:58:44 +0000 (08:58 -0800)]
c++: templatey type creation
This patch makes a couple of type-creation routines available to
modules. That needs to create unbound template parms, and canonical
template parms.
gcc/cp/
* cp-tree.h (make_unbound_class_template_raw): Declare.
(canonical_type_parameter): Declare.
* decl.c (make_unbound_class_template_raw): Break out of ...
(make_unboud_class_template): ... here. Call it.
* pt.c (canonical_type_parameter): Externalize. Refactor & set
structural_equality for type parms.
Uros Bizjak [Thu, 3 Dec 2020 16:49:42 +0000 (17:49 +0100)]
i386: Fix up ix86_md_asm_adjust for TImode [PR98086]
ix86_md_asm_adjust assumes that dest_mode can be only [QHSD]Imode
and nothing else. The patch rewrites zero-extension part to use
convert_to_mode to handle TImode and hypothetically even wider modes.
2020-12-03 Uroš Bizjak <ubizjak@gmail.com>
Jakub Jelinek <jakub@redhat.com>
gcc/
PR target/98086
* config/i386/i386.c (ix86_md_asm_adjustmd): Rewrite
zero-extension part to use convert_to_mode.
gcc/testsuite/
PR target/98086
* gcc.target/i386/pr98086.c: New test.
Nathan Sidwell [Thu, 3 Dec 2020 16:40:43 +0000 (08:40 -0800)]
c++: Testcases [PR 98115]
These two testcases provide coverage for 98115, which doesn't trigger on all hosts.
PR c++/98115
PR c++/98116
gcc/testsuite/
* g++.dg/template/pr98115.C: New.
* g++.dg/template/pr98116.C: New.
Ian Lance Taylor [Thu, 3 Dec 2020 02:11:00 +0000 (18:11 -0800)]
compiler: cast comparison function result to expected bool type
Otherwise cases like
type mybool bool
var b mybool = [10]string{} == [10]string{}
get an incorrect type checking error.
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/274446
Ian Lance Taylor [Wed, 2 Dec 2020 02:59:18 +0000 (18:59 -0800)]
compiler: defer to middle-end for complex division
Go used to use slightly different semantics than C99 for complex division,
so we used runtime routines to handle the different. The gc compiler
has changes its behavior to match C99, so changes ours as well.
For golang/go#14644
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/274213
Andreas Krebbel [Thu, 3 Dec 2020 16:04:11 +0000 (17:04 +0100)]
IBM Z: Fix mode in probe_stack pattern
The probe pattern uses Pmode but the middle-end wants to emit a
word_mode probe check. This - as usual - breaks on Z with -m31
-mzarch were word_mode doesn't match Pmode.
gcc/ChangeLog:
* config/s390/s390.md ("@probe_stack2<mode>"): Change mode
iterator to W.
gcc/testsuite/ChangeLog:
* gcc.target/s390/stack-clash-4.c: New test.
Nathan Sidwell [Thu, 3 Dec 2020 15:42:09 +0000 (07:42 -0800)]
c++: Fix array type dependency [PR 98107]
I'd missed some paths through build_cplus_array_type, plus, some
arrays come via the C-type builder. This propagates dependency in
more places and asserts that in the cases where TYPE_DEPENDENT_P_VALID
is unset, the type is non-dependent.
PR c++/98107
gcc/cp/
* tree.c (build_cplus_array_type): Mark dependency of new variant.
(cp_build_qualified_type_real, strip_typedefs): Assert
TYPE_DEPENDENT_P_VALID, or not a dependent type.
Richard Sandiford [Thu, 3 Dec 2020 15:22:52 +0000 (15:22 +0000)]
aarch64: Don't fold svundef* at the gimple level
As the testcase shows, folding svundef*() at the gimple level
has the unfortunate side-effect of introducing -Wuninitialized
or -Wmaybe-uninitialized warnings. We don't have a testcase
that relies on the fold, so the easiest fix seems to be to
remove it.
gcc/
* config/aarch64/aarch64-sve-builtins-base.cc (svundef_impl::fold):
Delete.
gcc/testsuite/
* gcc.target/aarch64/sve/acle/general/undef_1.c: New test.
Eric Botcazou [Thu, 3 Dec 2020 14:54:14 +0000 (15:54 +0100)]
Fix PR middle-end/98099
this replaces the ICE by a sorry message for the use of reverse scalar
storage order with 128-bit decimal floating-point type on 32-bit targets.
gcc/ChangeLog:
PR middle-end/98099
* expmed.c (flip_storage_order): In the case of a non-integer mode,
sorry out if the integer mode to be used instead is not supported.
gcc/testsuite/ChangeLog:
* gcc.dg/pr98099.c: New test.
Eric Botcazou [Thu, 3 Dec 2020 14:52:15 +0000 (15:52 +0100)]
Fix PR middle-end/98082
this fixes an ICE introduced by the fix for PR middle-end/97078 where
use_register_for_decl was changed to return true at -O0 for a parameter
of a thunk. It turns out that we need to do the same for a result in
this case.
gcc/ChangeLog:
PR middle-end/98082
* function.c (use_register_for_decl): Also return true for a result
if cfun->tail_call_marked is true.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/pr98082.C: New test.
Jakub Jelinek [Thu, 3 Dec 2020 14:46:54 +0000 (15:46 +0100)]
c++: Add __builtin_bit_cast to implement std::bit_cast [PR93121]
The following patch adds __builtin_bit_cast builtin, similarly to
clang or MSVC which implement std::bit_cast using such an builtin too.
It checks the various std::bit_cast requirements, when not constexpr
evaluated acts pretty much like VIEW_CONVERT_EXPR of the source argument
to the destination type and the hardest part is obviously the constexpr
evaluation.
I've left out PDP11 handling of those, couldn't figure out how exactly are
bitfields laid out there
2020-12-03 Jakub Jelinek <jakub@redhat.com>
PR libstdc++/93121
* fold-const.h (native_encode_initializer): Add mask argument
defaulted to nullptr.
(find_bitfield_repr_type): Declare.
(native_interpret_aggregate): Declare.
* fold-const.c (find_bitfield_repr_type): New function.
(native_encode_initializer): Add mask argument and support for
filling it. Handle also some bitfields without integral
DECL_BIT_FIELD_REPRESENTATIVE.
(native_interpret_aggregate): New function.
* gimple-fold.h (clear_type_padding_in_mask): Declare.
* gimple-fold.c (struct clear_padding_struct): Add clear_in_mask
member.
(clear_padding_flush): Handle buf->clear_in_mask.
(clear_padding_union): Copy clear_in_mask. Don't error if
buf->clear_in_mask is set.
(clear_padding_type): Don't error if buf->clear_in_mask is set.
(clear_type_padding_in_mask): New function.
(gimple_fold_builtin_clear_padding): Set buf.clear_in_mask to false.
* doc/extend.texi (__builtin_bit_cast): Document.
* c-common.h (enum rid): Add RID_BUILTIN_BIT_CAST.
* c-common.c (c_common_reswords): Add __builtin_bit_cast.
* cp-tree.h (cp_build_bit_cast): Declare.
* cp-tree.def (BIT_CAST_EXPR): New tree code.
* cp-objcp-common.c (names_builtin_p): Handle RID_BUILTIN_BIT_CAST.
(cp_common_init_ts): Handle BIT_CAST_EXPR.
* cxx-pretty-print.c (cxx_pretty_printer::postfix_expression):
Likewise.
* parser.c (cp_parser_postfix_expression): Handle
RID_BUILTIN_BIT_CAST.
* semantics.c (cp_build_bit_cast): New function.
* tree.c (cp_tree_equal): Handle BIT_CAST_EXPR.
(cp_walk_subtrees): Likewise.
* pt.c (tsubst_copy): Likewise.
* constexpr.c (check_bit_cast_type, cxx_eval_bit_cast): New functions.
(cxx_eval_constant_expression): Handle BIT_CAST_EXPR.
(potential_constant_expression_1): Likewise.
* cp-gimplify.c (cp_genericize_r): Likewise.
* g++.dg/cpp2a/bit-cast1.C: New test.
* g++.dg/cpp2a/bit-cast2.C: New test.
* g++.dg/cpp2a/bit-cast3.C: New test.
* g++.dg/cpp2a/bit-cast4.C: New test.
* g++.dg/cpp2a/bit-cast5.C: New test.
Jakub Jelinek [Thu, 3 Dec 2020 14:32:31 +0000 (15:32 +0100)]
c++: consteval-defarg1.C test variant for templates
We weren't recognizing a default argument for a consteval member function as
being in immediate function context because there was no function parameter
scope to look at.
The following testcase is an attempt to test it with templates, both
non-dependent and dependent consteval calls in both function and class
templates, and with r11-5694 it now passes.
2020-12-03 Jakub Jelinek <jakub@redhat.com>
* g++.dg/cpp2a/consteval-defarg2.C: New test.
Ilya Leoshkevich [Thu, 3 Dec 2020 00:38:47 +0000 (01:38 +0100)]
tree-ssa-threadedge.c (record_temporary_equivalences_from_stmts_at_dest): Do not allow __builtin_constant_p.
This is the same as commit
70a62009181f ("tree-ssa-threadbackward.c
(profitable_jump_thread_path): Do not allow __builtin_constant_p."), but
for the old forward threader.
gcc/ChangeLog:
2020-12-03 Ilya Leoshkevich <iii@linux.ibm.com>
* tree-ssa-threadedge.c (record_temporary_equivalences_from_stmts_at_dest):
Do not allow __builtin_constant_p on a threading path.
Ilya Leoshkevich [Thu, 3 Dec 2020 01:01:16 +0000 (02:01 +0100)]
Fix division by 0 in printf_strlen_execute when dumping
gcc/ChangeLog:
2020-12-03 Ilya Leoshkevich <iii@linux.ibm.com>
* tree-ssa-strlen.c (printf_strlen_execute): Avoid division by
0.
Kito Cheng [Wed, 25 Nov 2020 09:30:29 +0000 (17:30 +0800)]
RISC-V: Canonicalize --with-arch
- We would like to canonicalize the arch string for --with-arch for
easier handling multilib, so split canonicalization part to a stand
along script to shared the logic.
gcc/ChangeLog:
* config/riscv/multilib-generator (arch_canonicalize): Move
code to arch-canonicalize, and call that script to canonicalize arch
string.
(canonical_order): Move code to arch-canonicalize.
(LONG_EXT_PREFIXES): Ditto.
(IMPLIED_EXT): Ditto.
* config/riscv/arch-canonicalize: New.
* config.gcc (riscv*-*-*): Canonicalize --with-arch.
Przemyslaw Wirkus [Thu, 3 Dec 2020 09:24:59 +0000 (09:24 +0000)]
aarch64: Add +flagm to -march
New +flagm (Condition flag manipulation) feature option for -march command line
option.
Please note that FLAGM stays a Armv8.4-A feature but now can be
assigned to other architectures or CPUs.
gcc/ChangeLog:
* config/aarch64/aarch64-option-extensions.def
(AARCH64_OPT_EXTENSION): New +flagm option in -march for AArch64.
* config/aarch64/aarch64.h (AARCH64_FL_FLAGM): Add new flagm extension bit
mask.
(AARCH64_FL_FOR_ARCH8_4): Add flagm to Armv8.4-A.
* doc/invoke.texi: Update docs with +flagm.
Jakub Jelinek [Thu, 3 Dec 2020 09:02:02 +0000 (10:02 +0100)]
testsuite: Add testcase for already fixed PR [PR98104]
This testcase got broken with r11-3826 and got fixed with r11-5628.
2020-12-03 Jakub Jelinek <jakub@redhat.com>
PR c++/98104
* g++.dg/warn/pr98104.C: New test.
liuhongt [Mon, 30 Nov 2020 05:27:16 +0000 (13:27 +0800)]
Optimize vpsubusw compared to 0 into vpcmpleuw or vpcmpnleuw [PR96906]
For signed comparisons, it handles cases that are eq or neq to 0.
For unsigned comparisons, it additionaly handles cases that are le or
gt to 0(equivilent to eq or neq to 0). Transform case eq to leu,
case neq to gtu.
.i.e. for -mavx512bw -mavx512vl transform eq case code from
vpsubusw %xmm1, %xmm0, %xmm0
vpxor %xmm1, %xmm1, %xmm1
vpcmpeqw %xmm1, %xmm0, %k0
to
vpcmpleuw %xmm1, %xmm0, %k0
.i.e. for -mavx512bw -mavx512vl transform neq case code from
vpsubusw %xmm1, %xmm0, %xmm0
vpxor %xmm1, %xmm1, %xmm1
vpcmpneqw %xmm1, %xmm0, %k0
to
vpcmpnleuw %xmm1, %xmm0, %k0
gcc/ChangeLog
PR target/96906
* config/i386/sse.md
(<avx512>_ucmp<mode>3<mask_scalar_merge_name>): Add a new
define_split after this insn.
gcc/testsuite/ChangeLog
* gcc.target/i386/avx512bw-pr96906-1.c: New test.
* gcc.target/i386/pr96906-1.c: Add -mno-avx512f.
liuhongt [Tue, 3 Nov 2020 09:26:43 +0000 (17:26 +0800)]
Fix incorrect replacement of vmovdqu32 with vpblendd which can cause fault.
gcc/ChangeLog:
PR target/97642
* config/i386/i386-expand.c
(ix86_expand_special_args_builtin): Don't move all-ones mask
operands into register.
* config/i386/sse.md (UNSPEC_MASKLOAD): New unspec.
(*<avx512>_load<mode>_mask): New define_insns for masked load
instructions.
(<avx512>_load<mode>_mask): Changed to define_expands which
specifically handle memory or all-ones mask operands.
(<avx512>_blendm<mode>): Changed to define_insns which are same
as original <avx512>_load<mode>_mask with adjustment of
operands order.
(*<avx512>_load<mode>): New define_insn_and_split which is
used to optimize for masked load with all one mask.
gcc/testsuite/ChangeLog:
* gcc.target/i386/avx512bw-vmovdqu16-1.c: Adjust testcase to
make sure only masked load instruction is generated.
* gcc.target/i386/avx512bw-vmovdqu8-1.c: Ditto.
* gcc.target/i386/avx512f-vmovapd-1.c: Ditto.
* gcc.target/i386/avx512f-vmovaps-1.c: Ditto.
* gcc.target/i386/avx512f-vmovdqa32-1.c: Ditto.
* gcc.target/i386/avx512f-vmovdqa64-1.c: Ditto.
* gcc.target/i386/avx512vl-vmovapd-1.c: Ditto.
* gcc.target/i386/avx512vl-vmovaps-1.c: Ditto.
* gcc.target/i386/avx512vl-vmovdqa32-1.c: Ditto.
* gcc.target/i386/avx512vl-vmovdqa64-1.c: Ditto.
* gcc.target/i386/pr97642-1.c: New test.
* gcc.target/i386/pr97642-2.c: New test.
Jason Merrill [Wed, 2 Dec 2020 22:11:48 +0000 (17:11 -0500)]
c++: Push parms when late parsing default args
In this testcase we weren't catching the error in A::f because the parameter
'I' wasn't in scope, so the default argument for 'b' found the global
typedef I. Fixed by pushing the parms before parsing. This is a bit
complicated because pushdecl clears DECL_CHAIN; do_push_parm_decls deals
with this by nreversing first, but that doesn't work here because we only
want to push them one at a time; if we pushed all of them before parsing,
we'd wrongly reject A::g.
gcc/cp/ChangeLog:
* parser.c (cp_parser_primary_expression): Distinguish
parms from vars in error.
(cp_parser_late_parsing_default_args): Pushdecl parms
as we go.
gcc/testsuite/ChangeLog:
* g++.dg/parse/defarg17.C: New test.
Jason Merrill [Wed, 2 Dec 2020 19:35:50 +0000 (14:35 -0500)]
c++: Fix late-parsed default arg context
Jakub noticed that we weren't recognizing a default argument for a consteval
member function as being in immediate function context because there was no
function parameter scope to look at.
Note that this patch doesn't actually push the parameters into the scope,
that happens in a separate commit.
gcc/cp/ChangeLog:
* name-lookup.c (begin_scope): Set immediate_fn_ctx_p.
* parser.c (cp_parser_late_parsing_default_args): Push
sk_function_parms scope.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/consteval-defarg1.C: New test.
Hongyu Wang [Wed, 11 Nov 2020 01:41:13 +0000 (09:41 +0800)]
Add popcount<mode> expander to enable popcount auto vectorization under AVX512BITALG/AVX512POPCNTDQ target.
gcc/ChangeLog
PR target/97770
* config/i386/sse.md (popcount<mode>2): New expander
for SI/DI vector modes.
(popcount<mode>2): Likewise for QI/HI vector modes.
gcc/testsuite/ChangeLog
PR target/97770
* gcc.target/i386/avx512bitalg-pr97770-1.c: New test.
* gcc.target/i386/avx512vpopcntdq-pr97770-1.c: Likewise.
* gcc.target/i386/avx512vpopcntdq-pr97770-2.c: Likewise.
* gcc.target/i386/avx512vpopcntdqvl-pr97770-1.c: Likewise.
Alexandre Oliva [Thu, 3 Dec 2020 01:10:32 +0000 (22:10 -0300)]
introduce overridable clear_cache emitter
This patch introduces maybe_emit_call_builtin___clear_cache for the
builtin expander machinery and the trampoline initializers to use to
clear the instruction cache, removing a source of inconsistencies and
subtle errors in low-level machinery.
I've adjusted all trampoline_init implementations that used to issue
explicit calls to __clear_cache or similar to use this new primitive.
Specifically on vxworks targets, we needed to drop the __clear_cache
symbol in libgcc, for reasons related with linking that I didn't need
to understand, and we wanted to call cacheTextUpdate directly, despite
the different calling conventions: the second argument is a length
rather than the end address.
So I introduced a target hook to enable target OS-level overriding of
builtin __clear_cache call emission, retaining nearly (*) the same
logic to govern the decision on whether to emit a call (or nothing, or
a machine-dependent insn) but enabling a call to a target
system-defined function with different calling conventions to be
issued, without having to modify .md files of the various
architectures supported by the target system to introduce or modify
clear_cache insns.
(*) I write "nearly" mainly because, when not optimizing, we'd issue a
call regardless, but since the call may now be overridden, I added it
to the set of builtins that are not directly turned into calls when
not optimizing, following the normal expansion path instead. It
wouldn't be hard to skip the emission of cache-clearing insns when not
optimizing, but it didn't seem very important, especially for the new
uses from trampoline init.
Another difference that might be relevant is that now we expand
the begin and end arguments unconditionally. This might make a
difference if they have side effects. That's prettty much impossible
at expand time, but I thought I'd mention it.
I have NOT modified targets that did not issue cache-clearing calls in
trampoline init to use the new clear_cache-calling infrastructure even
if it would expand to nothing. I have considered doing so, to have
__builtin___clear_cache and trampoline init call cacheTextUpdate on
all vxworks targets, but decided not to, since on targets that don't
do any cache clearing, cacheTextUpdate ought to be a no-op, even
though rs6000 seems to use icbi and dcbf instructions in the function
called to initialize a trampoline, but AFAICT not in the __clear_cache
builtin. Hopefully target maintainers will have a look and take
advantage of this new piece of infrastructure to remove such
(apparent?) inconsistencies. Not rs6000 and other that call asm-coded
trampoline setup instructions, for sure, but they might wish to
introduce a CLEAR_INSN_CACHE macro or a clear_cache expander if they
don't have one.
for gcc/ChangeLog
* builtins.c (default_emit_call_builtin___clear_cache): New.
(maybe_emit_call_builtin___clear_cache): New.
(expand_builtin___clear_cache): Split into the above.
(expand_builtin): Do not issue clear_cache call any more.
* builtins.h (maybe_emit_call_builtin___clear_cache): Declare.
* config/aarch64/aarch64.c (aarch64_trampoline_init): Use
maybe_emit_call_builtin___clear_cache.
* config/arc/arc.c (arc_trampoline_init): Likewise.
* config/arm/arm.c (arm_trampoline_init): Likewise.
* config/c6x/c6x.c (c6x_initialize_trampoline): Likewise.
* config/csky/csky.c (csky_trampoline_init): Likewise.
* config/m68k/linux.h (FInALIZE_TRAMPOLINE): Likewise.
* config/tilegx/tilegx.c (tilegx_trampoline_init): Likewise.
* config/tilepro/tilepro.c (tilepro_trampoline_init): Ditto.
* config/vxworks.c: Include rtl.h, memmodel.h, and optabs.h.
(vxworks_emit_call_builtin___clear_cache): New.
* config/vxworks.h (CLEAR_INSN_CACHE): Drop.
(TARGET_EMIT_CALL_BUILTIN___CLEAR_CACHE): Define.
* target.def (trampoline_init): In the documentation, refer to
maybe_emit_call_builtin___clear_cache.
(emit_call_builtin___clear_cache): New.
* doc/tm.texi.in: Add new hook point.
(CLEAR_CACHE_INSN): Remove duplicate 'both'.
* doc/tm.texi: Rebuilt.
* targhooks.h (default_meit_call_builtin___clear_cache):
Declare.
* tree.h (BUILTIN_ASM_NAME_PTR): New.
for libgcc/ChangeLog
* config/t-vxworks (LIB2ADD): Drop.
* config/t-vxworks7 (LIB2ADD): Likewise.
* config/vxcache.c: Remove.
Alexandre Oliva [Thu, 3 Dec 2020 01:10:26 +0000 (22:10 -0300)]
options.exp: unsupport tests that depend on missing language
There's a help.exp test that checks that the help message for
-Wabsolute-value mentions it's available in C and ObjC, when compiling
a C++ program.
However, if GCC is built with the C++ language disabled, the
.cc file is compiled as C, and the message [available in C...] becomes
[disabled] instead, because that's the default for the flag in C.
I suppose it might also be possible to disable the C language, and
then the multitude of help.exp tests that name c as the source
language will fail.
This patch avoids these fails: it detects the message "compiler not
installed" in the compiler output, and bails out as "unsupported".
for gcc/testsuite/ChangeLog
* lib/options.exp (check_for_options_with_filter): Detect
unavailable compiler for the selected language, and bail out
as unsupported.
Martin Sebor [Thu, 3 Dec 2020 00:29:59 +0000 (17:29 -0700)]
Adjust tests even more to avoid ILP32 failures after r11-5622 (PR middle-end/97373)
gcc/testsuite/ChangeLog:
* gcc.dg/tree-ssa/builtin-sprintf-warn-1.c: Adjust expected warnings
to correctly reflect the maximum object size.
* gcc.dg/tree-ssa/builtin-sprintf-warn-11.c: Same.
* gcc.dg/tree-ssa/builtin-sprintf-warn-18.c: Same.
Ilya Leoshkevich [Wed, 3 Jun 2020 18:55:20 +0000 (20:55 +0200)]
tree-ssa-threadbackward.c (profitable_jump_thread_path): Do not allow __builtin_constant_p.
Linux Kernel (specifically, drivers/leds/trigger/ledtrig-cpu.c) build
with GCC 10 fails on s390 with "impossible constraint".
Explanation by Jeff Law:
```
So what we have is a b_c_p at the start of an if-else chain. Subsequent
tests on the "true" arm of the the b_c_p test may throw us off the
constant path (because the constants are out of range). Once all the
tests are passed (it's constant and the constant is in range) the true
arm's terminal block has a special asm that requires a constant
argument. In the case where we get to the terminal block on the true
arm, the argument to the b_c_p is used as the constant argument to the
special asm.
At first glace jump threading seems to be doing the right thing. Except
that we end up with two paths to that terminal block with the special
asm, one for each of the two constant arguments to the b_c_p call.
Naturally since that same value is used in the asm, we have to introduce
a PHI to select between them at the head of the terminal block. Now
the argument in the asm is no longer constant and boom we fail.
```
Fix by disallowing __builtin_constant_p on threading paths.
gcc/ChangeLog:
2020-06-03 Ilya Leoshkevich <iii@linux.ibm.com>
* tree-ssa-threadbackward.c (thread_jumps::profitable_jump_thread_path):
Do not allow __builtin_constant_p on a threading path.
gcc/testsuite/ChangeLog:
2020-06-03 Ilya Leoshkevich <iii@linux.ibm.com>
* gcc.target/s390/builtin-constant-p-threading.c: New test.
GCC Administrator [Thu, 3 Dec 2020 00:16:47 +0000 (00:16 +0000)]
Daily bump.
Peter Bergner [Thu, 3 Dec 2020 00:12:59 +0000 (18:12 -0600)]
c++: Treat OPAQUE_TYPE types as an aggregate type [PR97947]
MODE_OPAQUE and the associated OPAQUE_TYPE were added to stop the optimizers
from knowing how the bits in a variable with an opaque type are laid out.
This makes them a kind of pseudo aggregate type and we need to treat them
as such when we process the INIT initializer for variables with an
opaque type.
2020-12-02 Peter Bergner <bergner@linux.ibm.com>
gcc/cp/
PR c++/97947
* typeck2.c (digest_init_r): Handle OPAQUE_TYPE as an aggregate type.
gcc/testsuite/
PR c++/97947
* g++.target/powerpc/pr97947.C: New test.
Jakub Jelinek [Wed, 2 Dec 2020 23:29:46 +0000 (00:29 +0100)]
dwarf2out: Fix up add_scalar_info not to create invalid DWARF
As discussed in https://sourceware.org/bugzilla/show_bug.cgi?id=26987 ,
for very large bounds (which don't fit into HOST_WIDE_INT) GCC emits invalid
DWARF.
In DWARF2, DW_AT_{lower,upper}_bound were constant reference class.
In DWARF3 they are block constant reference and the
Static and Dynamic Properties of Types
chapter says:
"For a block, the value is interpreted as a DWARF expression; evaluation of the expression
yields the value of the attribute."
In DWARF4/5 they are constant exprloc reference class.
Now, for add_AT_wide we use DW_FORM_data16 (valid in constant class)
when -gdwarf-5, but otherwise just use DW_FORM_block1, which is not constant
class, but block.
For DWARF3 this means emitting clearly invalid DWARF, because the
DW_FORM_block1 should contain a DWARF expression, not random bytes
containing the constant directly.
For DWARF2/DWARF4/5 it could be considered a GNU extension, but a very badly
designed one when it means something different in DWARF3.
The following patch uses add_AT_wide only if we know we'll be using
DW_FORM_data16, and otherwise wastes 2 extra bytes and emits in there
DW_OP_implicit_value <size> before the constant.
2020-12-03 Jakub Jelinek <jakub@redhat.com>
* dwarf2out.c (add_scalar_info): Only use add_AT_wide for 128-bit
constants and only in dwarf-5 or later, where DW_FORM_data16 is
available. Otherwise use DW_FORM_block*/DW_FORM_exprloc with
DW_OP_implicit_value to describe the constant.
Jakub Jelinek [Wed, 2 Dec 2020 23:25:51 +0000 (00:25 +0100)]
c++: Implement LWG3396 Clarify point of reference for source_location::current() [PR80780, PR93093]
While std::source_location::current () is static consteval source_location
current() noexcept; in the standard, it also says with LWG3396:
"Any call to current that appears as a default member initializer
([class.mem]), or as a subexpression thereof, should correspond to the
location of the constructor definition or aggregate initialization that uses
the default member initializer. Any call to current that appears as a
default argument ([dcl.fct.default]), or as a subexpression thereof, should
correspond to the location of the invocation of the function that uses the
default argument ([expr.call])."
so it must work as compiler magic rather than normal immediate functions,
in particular we need to defer its evaluation when parsing default arguments
or nsdmis.
This patch actually defers evaluation of all the calls to
std::source_location::current () until genericization (or constant expression
evaluation when called from constant expression contexts).
I had to change constexpr.c too so that it temporarily adjusts
current_function_decl from the constexpr evaluation context, but we do the
same already from __builtin_FUNCTION ().
2020-12-03 Jakub Jelinek <jakub@redhat.com>
PR c++/80780
PR c++/93093
* cp-tree.h (source_location_current_p): Declare.
* tree.c (source_location_current_p): New function.
* call.c (immediate_invocation_p): New function.
(build_over_call): Use it to resolve LWG3396.
* constexpr.c (cxx_eval_builtin_function_call): Temporarily set
current_function_decl from ctx->call->fundef->decl if any.
* cp-gimplify.c (cp_genericize_r) <case CALL_EXPR>: Fold calls
to immediate function std::source_location::current ().
* g++.dg/cpp2a/srcloc15.C: New test.
* g++.dg/cpp2a/srcloc16.C: New test.
* g++.dg/cpp2a/srcloc17.C: New test.
* g++.dg/cpp2a/srcloc18.C: New test.
qing zhao [Wed, 2 Dec 2020 22:48:02 +0000 (23:48 +0100)]
rtl-optimization: Fix data flow maintenance bug in reg-stack.c [pr97777]
reg-stack pass does not maintain the data flow information correctly.
call df_insn_rescan_all after the transformation is done.
gcc/
PR rtl-optimization/97777
* reg-stack.c (rest_of_handle_stack_regs): call
df_insn_rescan_all if reg_to_stack return true.
gcc/testsuite/
PR rtl-optimization/97777
* gcc.target/i386/pr97777.c: New test.
Jonathan Wakely [Wed, 2 Dec 2020 21:39:08 +0000 (21:39 +0000)]
libstdc++: Fix std::any pretty printer [PR 68735]
This fixes errors seen on powerpc64 (big endian only) due to the
printers for std::any and std::experimental::any being unable to find
the manager function.
libstdc++-v3/ChangeLog:
PR libstdc++/65480
PR libstdc++/68735
* python/libstdcxx/v6/printers.py (function_pointer_to_name):
New helper function to get the name of a function from its
address.
(StdExpAnyPrinter.__init__): Use it.
Jason Merrill [Thu, 26 Nov 2020 10:45:02 +0000 (05:45 -0500)]
c++: Give better placeholder diagnostic
We were saying 'auto parameter not permitted' in a place where 'auto' is in
fact permitted in C++20, but a class template placeholder is not.
gcc/cp/ChangeLog:
* decl.c (grokdeclarator): Improve diagnostic for
disallowed CTAD placeholder.
gcc/testsuite/ChangeLog:
* g++.dg/other/pr88187.C: Adjust expected error.
* g++.dg/cpp2a/class-deduction-abbrev1.C: New test.
Jason Merrill [Tue, 24 Nov 2020 23:21:38 +0000 (18:21 -0500)]
c++: Improve init handling
While looking at another issue I noticed that in a template we were failing
to find the INIT_EXPR we were looking for, and so ended up doing redundant
processing. No testcase, as the redundant processing ended up getting the
right result.
gcc/cp/ChangeLog:
* decl.c (check_initializer): Also look through STMT_EXPR
and BIND_EXPR.