diff options
Diffstat (limited to 'gcc/gcse.c')
| -rw-r--r-- | gcc/gcse.c | 9 |
1 files changed, 6 insertions, 3 deletions
@@ -3856,9 +3856,12 @@ try_replace_reg (rtx from, rtx to, rtx insn) && validate_change (insn, &SET_SRC (set), src, 0)) success = 1; - /* If we've failed to do replacement, have a single SET, and don't already - have a note, add a REG_EQUAL note to not lose information. */ - if (!success && note == 0 && set != 0) + /* If we've failed to do replacement, have a single SET, don't already + have a note, and have no special SET, add a REG_EQUAL note to not + lose information. */ + if (!success && note == 0 && set != 0 + && GET_CODE (XEXP (set, 0)) != ZERO_EXTRACT + && GET_CODE (XEXP (set, 0)) != SIGN_EXTRACT) note = set_unique_reg_note (insn, REG_EQUAL, copy_rtx (src)); } |