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| author | Steven Bosscher <steven@gcc.gnu.org> | 2012-12-02 15:46:26 +0000 |
|---|---|---|
| committer | Steven Bosscher <steven@gcc.gnu.org> | 2012-12-02 15:46:26 +0000 |
| commit | 853f8f1c1ced73b423dc1b56c81f4e78c6e5f734 (patch) | |
| tree | 413cf367e7b936822c65e09dddbfcca70f28aceb /gcc/fwprop.c | |
| parent | fa967f341ce38053b0baf106454139e29786d061 (diff) | |
| download | gcc-853f8f1c1ced73b423dc1b56c81f4e78c6e5f734.zip gcc-853f8f1c1ced73b423dc1b56c81f4e78c6e5f734.tar.gz gcc-853f8f1c1ced73b423dc1b56c81f4e78c6e5f734.tar.bz2 | |
optabs.c (add_equal_note): Do not create self-referencing REG_EQUAL notes.
* optabs.c (add_equal_note): Do not create self-referencing REG_EQUAL
notes.
* fwprop.c (forward_propagate_and_simplify): Likewise.
From-SVN: r194054
Diffstat (limited to 'gcc/fwprop.c')
| -rw-r--r-- | gcc/fwprop.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/gcc/fwprop.c b/gcc/fwprop.c index 0f2ee49..35c82d7 100644 --- a/gcc/fwprop.c +++ b/gcc/fwprop.c @@ -1315,9 +1315,12 @@ forward_propagate_and_simplify (df_ref use, rtx def_insn, rtx def_set) /* Do not replace an existing REG_EQUAL note if the insn is not recognized. Either we're already replacing in the note, or we'll separately try plugging the definition in the note and simplifying. - And only install a REQ_EQUAL note when the destination is a REG, - as the note would be invalid otherwise. */ - set_reg_equal = (note == NULL_RTX && REG_P (SET_DEST (use_set))); + And only install a REQ_EQUAL note when the destination is a REG + that isn't mentioned in USE_SET, as the note would be invalid + otherwise. */ + set_reg_equal = (note == NULL_RTX && REG_P (SET_DEST (use_set)) + && ! reg_mentioned_p (SET_DEST (use_set), + SET_SRC (use_set))); } if (GET_MODE (*loc) == VOIDmode) |