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loop.c (strength_reduce): When doing biv->giv conversion, update reg note of NEXT->insn.

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* loop.c (strength_reduce): When doing biv->giv conversion, update
	reg note of NEXT->insn.

From-SVN: r27574
This commit is contained in:
J"orn Rennecke 1999-06-17 13:35:59 +00:00 committed by Joern Rennecke
parent 51f0646f8a
commit a1c0cf1f76
2 changed files with 13 additions and 2 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Thu Jun 17 21:34:24 1999 J"orn Rennecke <amylaar@cygnus.co.uk>
* loop.c (strength_reduce): When doing biv->giv conversion, update
reg note of NEXT->insn.
Thu Jun 17 14:25:08 1999 Jeffrey A Law (law@cygnus.com)
* loop.c (move_movables): Note issues with replacing REGs with

8
gcc/loop.c
View File

@ -4198,7 +4198,7 @@ strength_reduce (scan_start, end, loop_top, insn_count,
for (vp = &bl->biv, next = *vp; v = next, next = v->next_iv;)
{
HOST_WIDE_INT offset;
rtx set, add_val, old_reg, dest_reg, last_use_insn;
rtx set, add_val, old_reg, dest_reg, last_use_insn, note;
int old_regno, new_regno;
if (! v->always_executed
@ -4305,6 +4305,12 @@ strength_reduce (scan_start, end, loop_top, insn_count,
REG_IV_TYPE (new_regno) = GENERAL_INDUCT;
REG_IV_INFO (new_regno) = v;
/* If next_insn has a REG_EQUAL note that mentiones OLD_REG,
it must be replaced. */
note = find_reg_note (next->insn, REG_EQUAL, NULL_RTX);
if (note && reg_mentioned_p (old_reg, XEXP (note, 0)))
XEXP (note, 0) = copy_rtx (SET_SRC (single_set (next->insn)));
/* Remove the increment from the list of biv increments,
and record it as a giv. */
*vp = next;