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(find_auto_inc): In *p=expr;q=p+size case, avoid clobbering q if referenced in expr. 

* (find_auto_inc): In *p=expr;q=p+size case, avoid clobbering q
if referenced in expr.

From-SVN: r4830
This commit is contained in:
Doug Evans 1993-07-02 02:51:57 +00:00
parent f52fba8493
commit 5175ad374a
1 changed files with 6 additions and 3 deletions
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9
gcc/flow.c
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@ -1989,11 +1989,14 @@ find_auto_inc (needed, x, insn)
if (dead_or_set_p (incr, addr))
win = 1;
else if (GET_CODE (q) == REG && ! reg_used_between_p (q, insn, incr))
else if (GET_CODE (q) == REG
/* PREV_INSN used here to check the semi-open interval
[insn,incr). */
&& ! reg_used_between_p (q, PREV_INSN (insn), incr))
{
/* We have *p followed by q = p+size.
/* We have *p followed sometime later by q = p+size.
Both p and q must be live afterward,
and q must be dead before.
and q is not used between INSN and it's assignment.
Change it to q = p, ...*q..., q = q+size.
Then fall into the usual case. */
rtx insns, temp;