diff options
Diffstat (limited to 'gcc/postreload.c')
| -rw-r--r-- | gcc/postreload.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/gcc/postreload.c b/gcc/postreload.c index f5a987a7f0d..362b50ebc13 100644 --- a/gcc/postreload.c +++ b/gcc/postreload.c @@ -718,7 +718,9 @@ reload_combine (void) ... (MEM (PLUS (REGZ) (REGY)))... . First, check that we have (set (REGX) (PLUS (REGX) (REGY))) - and that we know all uses of REGX before it dies. */ + and that we know all uses of REGX before it dies. + Also, explicitly check that REGX != REGY; our life information + does not yet show whether REGY changes in this insn. */ set = single_set (insn); if (set != NULL_RTX && GET_CODE (SET_DEST (set)) == REG @@ -728,6 +730,7 @@ reload_combine (void) && GET_CODE (SET_SRC (set)) == PLUS && GET_CODE (XEXP (SET_SRC (set), 1)) == REG && rtx_equal_p (XEXP (SET_SRC (set), 0), SET_DEST (set)) + && !rtx_equal_p (XEXP (SET_SRC (set), 1), SET_DEST (set)) && last_label_ruid < reg_state[REGNO (SET_DEST (set))].use_ruid) { rtx reg = SET_DEST (set); |