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| author | Richard Earnshaw <rearnsha@arm.com> | 2000-08-23 15:15:21 +0000 |
|---|---|---|
| committer | Richard Earnshaw <rearnsha@gcc.gnu.org> | 2000-08-23 15:15:21 +0000 |
| commit | e04c2d6ca11eed2c675c7a6d38ce3153fd44a635 (patch) | |
| tree | f66318bf944f5653cb03ef80e8fe573deeafd042 | |
| parent | 47db946ca4f65b526ab014d0059766ca0b58907b (diff) | |
| download | gcc-e04c2d6ca11eed2c675c7a6d38ce3153fd44a635.zip gcc-e04c2d6ca11eed2c675c7a6d38ce3153fd44a635.tar.gz gcc-e04c2d6ca11eed2c675c7a6d38ce3153fd44a635.tar.bz2 | |
arm.c (arm_expand_prologue): Ensure that the stack-adjustment barrier can't be ignored by the alias analysis...
* arm.c (arm_expand_prologue): Ensure that the stack-adjustment
barrier can't be ignored by the alias analysis code.
From-SVN: r35911
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/config/arm/arm.c | 15 |
2 files changed, 18 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index e2940b2..3b5df62 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2000-08-23 Richard Earnshaw (rearnsha@arm.com) + + * arm.c (arm_expand_prologue): Ensure that the stack-adjustment + barrier can't be ignored by the alias analysis code. + 2000-08-12 Eli Zaretskii <eliz@is.elta.co.il> * fixinc/inclhack.def (sysv68_string): Fix the Sed script so it diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c index d559d00..4c7679a 100644 --- a/gcc/config/arm/arm.c +++ b/gcc/config/arm/arm.c @@ -7430,8 +7430,19 @@ arm_expand_prologue () insn = emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx, amount)); RTX_FRAME_RELATED_P (insn) = 1; - emit_insn (gen_rtx_CLOBBER (VOIDmode, - gen_rtx_MEM (BLKmode, stack_pointer_rtx))); + + /* If the frame pointer is needed, emit a special barrier that + will prevent the scheduler from moving stores to the frame + before the stack adjustment. */ + if (frame_pointer_needed) + { + rtx unspec = gen_rtx_UNSPEC (SImode, + gen_rtvec (2, stack_pointer_rtx, + hard_frame_pointer_rtx), 4); + + emit_insn (gen_rtx_CLOBBER (VOIDmode, + gen_rtx_MEM (BLKmode, unspec))); + } } /* If we are profiling, make sure no instructions are scheduled before |