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except.c (dw2_build_landing_pads): New local clobbers_hard_regs.

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* except.c (dw2_build_landing_pads): New local
	clobbers_hard_regs.  Emit an ASM_INPUT as a scheduling
	barrier after clobbers.  Fixes c++/4012.

From-SVN: r45667
This commit is contained in:
Jeff Sturm 2001-09-17 23:16:28 +00:00 committed by Jeff Sturm
parent c793eea7ab
commit 5c701bb10c
2 changed files with 20 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2001-09-17 Jeff Sturm <jsturm@one-point.com>
* except.c (dw2_build_landing_pads): New local
clobbers_hard_regs. Emit an ASM_INPUT as a scheduling
barrier after clobbers. Fixes c++/4012.
2001-09-17 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>
* gcc.c (find_file): Use ACONCAT in lieu of alloca/strcpy/strcat.

15
gcc/except.c
View File

@ -1865,6 +1865,7 @@ dw2_build_landing_pads ()
{
struct eh_region *region = cfun->eh->region_array[i];
rtx seq;
bool clobbers_hard_regs = false;
/* Mind we don't process a region more than once. */
if (!region || region->region_number != i)
@ -1901,7 +1902,19 @@ dw2_build_landing_pads ()
if (r == INVALID_REGNUM)
break;
if (! call_used_regs[r])
emit_insn (gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (Pmode, r)));
{
emit_insn (gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (Pmode, r)));
clobbers_hard_regs = true;
}
}
if (clobbers_hard_regs)
{
/* @@@ This is a kludge. Not all machine descriptions define a
blockage insn, but we must not allow the code we just generated
to be reordered by scheduling. So emit an ASM_INPUT to act as
blockage insn. */
emit_insn (gen_rtx_ASM_INPUT (VOIDmode, ""));
}
emit_move_insn (cfun->eh->exc_ptr,