diff options
Diffstat (limited to 'gcc/fwprop.c')
| -rw-r--r-- | gcc/fwprop.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/gcc/fwprop.c b/gcc/fwprop.c index 0c5c7280ad5..708ab3f8edc 100644 --- a/gcc/fwprop.c +++ b/gcc/fwprop.c @@ -818,17 +818,23 @@ all_uses_available_at (rtx def_insn, rtx target_insn) } else { + rtx def_reg = REG_P (SET_DEST (def_set)) ? SET_DEST (def_set) : NULL_RTX; + /* Look at all the uses of DEF_INSN, and see if they are not killed between DEF_INSN and TARGET_INSN. */ for (use_rec = DF_INSN_INFO_USES (insn_info); *use_rec; use_rec++) { df_ref use = *use_rec; + if (def_reg && rtx_equal_p (DF_REF_REG (use), def_reg)) + return false; if (use_killed_between (use, def_insn, target_insn)) return false; } for (use_rec = DF_INSN_INFO_EQ_USES (insn_info); *use_rec; use_rec++) { df_ref use = *use_rec; + if (def_reg && rtx_equal_p (DF_REF_REG (use), def_reg)) + return false; if (use_killed_between (use, def_insn, target_insn)) return false; } |