+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.
{
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)
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,