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| author | Richard Earnshaw <rearnsha@arm.com> | 2003-10-31 15:11:37 +0000 |
|---|---|---|
| committer | Richard Earnshaw <rearnsha@gcc.gnu.org> | 2003-10-31 15:11:37 +0000 |
| commit | 71c1543c4bbfb0c35fd2fbd776e3ea8d82d56cdc (patch) | |
| tree | 475d98a2798668b0b5903605f003d2129934ebcc /gcc/postreload.c | |
| parent | 4cabf776b3d5764eca3a5e2336fbdc42e2949625 (diff) | |
| download | gcc-71c1543c4bbfb0c35fd2fbd776e3ea8d82d56cdc.tar.gz | |
postreload.c (reload_combine): Check that REGY doesn't die in an insn of the form (set (regx) (plus (regx)...
* postreload.c (reload_combine): Check that REGY doesn't die in an
insn of the form (set (regx) (plus (regx) (regy))), ie REGX != REGY.
From-SVN: r73148
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); |