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loop.c (strength_reduce): Don't move giv insn for biv turned giv below scan_start.

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* loop.c (strength_reduce): Don't move giv insn for biv turned giv
	below scan_start.

From-SVN: r25264
This commit is contained in:
J"orn Rennecke 1999-02-17 09:01:07 +00:00 committed by Joern Rennecke
parent 95ac945dc0
commit 079a615d28
2 changed files with 6 additions and 0 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
Wed Feb 17 16:59:28 1999 J"orn Rennecke <amylaar@cygnus.co.uk>
* loop.c (strength_reduce): Don't move giv insn for biv turned giv
below scan_start.
Wed Feb 17 10:56:24 1999 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>
* tree.c (tree_node_kind_names, print_obstack_name,

1
gcc/loop.c
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@ -4053,6 +4053,7 @@ strength_reduce (scan_start, end, loop_top, insn_count,
/* We can get better optimization if we can move the giv setting
before the first giv use. */
if (dominator
&& ! loop_insn_first_p (dominator, scan_start)
&& ! reg_set_between_p (bl2->biv->src_reg, loop_start,
dominator)
&& ! reg_used_between_p (giv, loop_start, dominator)