From: Oleg Endo Date: Tue, 17 Feb 2015 21:38:12 +0000 (+0000) Subject: sh.opt (mcbranch-force-delay-slot): New option. X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=f05911fb07ef21bd158da44d8618b7be84f11b21;p=gcc.git sh.opt (mcbranch-force-delay-slot): New option. gcc/ * config/sh/sh.opt (mcbranch-force-delay-slot): New option. * doc/invoke.texi (SH options): Document it. * config/sh/sh.c (sh_insn_length_adjustment): Check TARGET_CBRANCH_FORCE_DELAY_SLOT instead of sh_cpu_attr == CPU_SH2E. gcc/testsuite/ * gcc.target/sh/sh.exp (check_effective_target_sh1): New. * gcc.target/sh/force-cbranch-delay-slot.c: New. From-SVN: r220774 --- diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 4011f744919..5a44fccaf5c 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2015-02-17 Oleg Endo + + * config/sh/sh.opt (mcbranch-force-delay-slot): New option. + * doc/invoke.texi (SH options): Document it. + * config/sh/sh.c (sh_insn_length_adjustment): Check + TARGET_CBRANCH_FORCE_DELAY_SLOT instead of sh_cpu_attr == CPU_SH2E. + 2015-02-17 H.J. Lu * common.opt (fipa-cp-alignment): New. diff --git a/gcc/config/sh/sh.c b/gcc/config/sh/sh.c index 2afd44ebde6..7c9d8e2e0c6 100644 --- a/gcc/config/sh/sh.c +++ b/gcc/config/sh/sh.c @@ -10245,11 +10245,10 @@ sh_insn_length_adjustment (rtx_insn *insn) && get_attr_needs_delay_slot (insn) == NEEDS_DELAY_SLOT_YES) return 2; - /* SH2e has a bug that prevents the use of annulled branches, so if - the delay slot is not filled, we'll have to put a NOP in it. */ - if (sh_cpu_attr == CPU_SH2E - && JUMP_P (insn) - && get_attr_type (insn) == TYPE_CBRANCH + /* Increase the insn length of a cbranch without a delay slot insn to + force a delay slot which will be stuffed with a nop. */ + if (TARGET_CBRANCH_FORCE_DELAY_SLOT && TARGET_SH2 + && JUMP_P (insn) && get_attr_type (insn) == TYPE_CBRANCH && ! sequence_insn_p (insn)) return 2; diff --git a/gcc/config/sh/sh.opt b/gcc/config/sh/sh.opt index 6e4ab862a4d..beb4bc8a017 100644 --- a/gcc/config/sh/sh.opt +++ b/gcc/config/sh/sh.opt @@ -229,7 +229,7 @@ Target RejectNegative Joined UInteger Var(sh_branch_cost) Init(-1) Cost to assume for a branch insn mzdcbranch -Target Var(TARGET_ZDCBRANCH) +Target Report Var(TARGET_ZDCBRANCH) Assume that zero displacement conditional branches are fast mcbranchdi @@ -240,6 +240,10 @@ mcmpeqdi Target Undocumented Var(TARGET_CMPEQDI_T) Warn(%qs is deprecated and has no effect) Emit cmpeqdi_t pattern even when -mcbranchdi is in effect. +mcbranch-force-delay-slot +Target Report RejectNegative Var(TARGET_CBRANCH_FORCE_DELAY_SLOT) Init(0) +Force the usage of delay slots for conditional branches. + mcut2-workaround Target RejectNegative Var(TARGET_SH5_CUT2_WORKAROUND) Enable SH5 cut2 workaround diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 931002e2b91..d009cb2c940 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -965,6 +965,7 @@ See RS/6000 and PowerPC Options. -maccumulate-outgoing-args -minvalid-symbols @gol -matomic-model=@var{atomic-model} @gol -mbranch-cost=@var{num} -mzdcbranch -mno-zdcbranch @gol +-mcbranch-force-delay-slot @gol -mfused-madd -mno-fused-madd -mfsca -mno-fsca -mfsrra -mno-fsrra @gol -mpretend-cmove -mtas} @@ -20593,6 +20594,13 @@ compiler prefers zero displacement branch code sequences. This is enabled by default when generating code for SH4 and SH4A. It can be explicitly disabled by specifying @option{-mno-zdcbranch}. +@item -mcbranch-force-delay-slot +@opindex mcbranch-force-delay-slot +Force the usage of delay slots for conditional branches, which stuffs the delay +slot with a @code{nop} if a suitable instruction can't be found. By default +this option is disabled. It can be enabled to work around hardware bugs as +found in the original SH7055. + @item -mfused-madd @itemx -mno-fused-madd @opindex mfused-madd diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 69c7c50e0ea..866d4d93481 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2015-02-17 Oleg Endo + + * gcc.target/sh/sh.exp (check_effective_target_sh1): New. + * gcc.target/sh/force-cbranch-delay-slot.c: New. + 2015-02-17 H.J. Lu * gcc.dg/ipa/propalign-3.c: New test. diff --git a/gcc/testsuite/gcc.target/sh/force-cbranch-delay-slot.c b/gcc/testsuite/gcc.target/sh/force-cbranch-delay-slot.c new file mode 100644 index 00000000000..e828b993a10 --- /dev/null +++ b/gcc/testsuite/gcc.target/sh/force-cbranch-delay-slot.c @@ -0,0 +1,18 @@ +/* Check that the option -mcbranch-force-delay-slot works as expected on + targets other than SH1, and that it compiles on SH1 targets without fuzz. */ +/* { dg-do compile } */ +/* { dg-options "-O2 -mcbranch-force-delay-slot" } */ +/* { dg-final { scan-assembler-times "nop" 2 { target { ! sh1 } } } } */ + +int g (int, int); + +int +f (int a, int b) +{ + /* Expected: 1x bt/s, 1x nop. */ + if (a != 5) + a = 10; + + /* Expected: 1x jmp, 1x nop. */ + return g (a, b); +} diff --git a/gcc/testsuite/gcc.target/sh/sh.exp b/gcc/testsuite/gcc.target/sh/sh.exp index 6f9c97e34e7..f00dbd54cef 100644 --- a/gcc/testsuite/gcc.target/sh/sh.exp +++ b/gcc/testsuite/gcc.target/sh/sh.exp @@ -33,6 +33,15 @@ proc check_effective_target_sh2a { } { } ""] } +# Return 1 if target is SH1 +proc check_effective_target_sh1 { } { + return [check_no_compiler_messages sh1 object { + #ifndef __SH1__ + #error "" + #endif + } ""] +} + # Return 1 if target supports atomic-model=soft-gusa proc check_effective_target_atomic_model_soft_gusa_available { } { return [check_no_compiler_messages atomic_model_soft_gusa_available object {