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# DP: Proposed patch for PR rtl-optimization/49847 (cc0 targets).
gcc/
2012-02-26 Mikael Pettersson <mikpe@it.uu.se>
PR rtl-optimization/49847
* cse.c (fold_rtx) <case CC0>: If prev_insn_cc0 is zero
don't call equiv_constant on it.
--- a/src/gcc/cse.c
+++ b/src/gcc/cse.c
@@ -3194,9 +3194,14 @@ fold_rtx (rtx x, rtx insn)
#ifdef HAVE_cc0
case CC0:
- folded_arg = prev_insn_cc0;
- mode_arg = prev_insn_cc0_mode;
- const_arg = equiv_constant (folded_arg);
+ if (!prev_insn_cc0)
+ const_arg = 0;
+ else
+ {
+ folded_arg = prev_insn_cc0;
+ mode_arg = prev_insn_cc0_mode;
+ const_arg = equiv_constant (folded_arg);
+ }
break;
#endif
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