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arm.c (arm_expand_prologue): Ensure that the stack-adjustment barrier can't be ignored by the alias analysis...

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* arm.c (arm_expand_prologue): Ensure that the stack-adjustment
barrier can't be ignored by the alias analysis code.

From-SVN: r35911
This commit is contained in:
Richard Earnshaw 2000-08-23 15:15:21 +00:00 • committed by Richard Earnshaw
parent 47db946ca4
commit e04c2d6ca1
2 changed files with 18 additions and 2 deletions
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5
gcc/ChangeLog
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@ -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

15
gcc/config/arm/arm.c
View file

@ -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