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patch applide to loop.c - Re: Codegen bug with strength reduction - more details
- To: egcs-patches at egcs dot cygnus dot com
- Subject: patch applide to loop.c - Re: Codegen bug with strength reduction - more details
- From: Joern Rennecke <amylaar at cygnus dot co dot uk>
- Date: Wed, 17 Feb 1999 17:02:44 +0000 (GMT)
- Cc: amylaar at cygnus dot co dot uk
Approved by Jim Wilson.
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.
Index: loop.c
===================================================================
RCS file: /egcs/carton/cvsfiles/egcs/gcc/loop.c,v
retrieving revision 1.131
diff -p -r1.131 loop.c
*** loop.c 1999/02/06 00:46:54 1.131
--- loop.c 1999/02/15 23:24:37
*************** strength_reduce (scan_start, end, loop_t
*** 4046,4051 ****
--- 4046,4052 ----
/* 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)