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| author | law <law@138bc75d-0d04-0410-961f-82ee72b054a4> | 2000-02-26 02:58:08 +0000 |
|---|---|---|
| committer | law <law@138bc75d-0d04-0410-961f-82ee72b054a4> | 2000-02-26 02:58:08 +0000 |
| commit | 5c1a1b6c153236f5cab6456e7afe6892fb00ac1f (patch) | |
| tree | 31cc4a10bd8b654226036c4fd73abe8905b111cc /gcc/rtlanal.c | |
| parent | ca1b9c769b4882a71d2ef0dc681277fcd9fc4678 (diff) | |
| download | gcc-5c1a1b6c153236f5cab6456e7afe6892fb00ac1f.tar.gz | |
* rtlanal.c (find_last_value): Allow NULL_RTX for valid_to.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@32163 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/rtlanal.c')
| -rw-r--r-- | gcc/rtlanal.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/gcc/rtlanal.c b/gcc/rtlanal.c index 24ca8d1b530..a1d42a6349e 100644 --- a/gcc/rtlanal.c +++ b/gcc/rtlanal.c @@ -750,11 +750,12 @@ multiple_sets (insn) return 0; } -/* Return the last thing that X was assigned from before *PINSN. Verify that - the object is not modified up to VALID_TO. If it was, if we hit - a partial assignment to X, or hit a CODE_LABEL first, return X. If we - found an assignment, update *PINSN to point to it. - ALLOW_HWREG is set to 1 if hardware registers are allowed to be the src. */ +/* Return the last thing that X was assigned from before *PINSN. If VALID_TO + is not NULL_RTX then verify that the object is not modified up to VALID_TO. + If the object was modified, if we hit a partial assignment to X, or hit a + CODE_LABEL first, return X. If we found an assignment, update *PINSN to + point to it. ALLOW_HWREG is set to 1 if hardware registers are allowed to + be the src. */ rtx find_last_value (x, pinsn, valid_to, allow_hwreg) @@ -779,7 +780,8 @@ find_last_value (x, pinsn, valid_to, allow_hwreg) if (note && GET_CODE (XEXP (note, 0)) != EXPR_LIST) src = XEXP (note, 0); - if (! modified_between_p (src, PREV_INSN (p), valid_to) + if ((valid_to == NULL_RTX + || ! modified_between_p (src, PREV_INSN (p), valid_to)) /* Reject hard registers because we don't usually want to use them; we'd rather use a pseudo. */ && (! (GET_CODE (src) == REG |