------- Additional Comments From aoliva at gcc dot gnu dot org 2005-04-16
21:48 -------
Subject: Re: [PR target/20126, RFC] loop DEST_ADDR biv replacement may fail
On Apr 15, 2005, Roger Sayle <[EMAIL PROTECTED]> wrote:
> Sure. Your patch in comment #28 of bugzilla PR20126 is OK for mainline
> to resolve Josh's bootstrap failure. Sounds like you've already done
> the necessary testing, and I'll trust you on a suitable ChangeLog entry.
Thanks, here's what I've just checked in.
Index: gcc/ChangeLog
from Alexandre Oliva <[EMAIL PROTECTED]>
PR target/20126
* loop.c (loop_givs_rescan): Handle non-replaceable (plus (reg)
(const)).
Index: gcc/loop.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/loop.c,v
retrieving revision 1.526
diff -u -p -r1.526 loop.c
--- gcc/loop.c 10 Apr 2005 04:00:45 -0000 1.526
+++ gcc/loop.c 16 Apr 2005 21:40:02 -0000
@@ -5488,6 +5488,15 @@ loop_givs_rescan (struct loop *loop, str
loop_insn_emit_before (loop, 0, v->insn,
gen_move_insn (*v->location,
v->new_reg));
+ else if (GET_CODE (*v->location) == PLUS
+ && REG_P (XEXP (*v->location, 0))
+ && CONSTANT_P (XEXP (*v->location, 1)))
+ loop_insn_emit_before (loop, 0, v->insn,
+ gen_move_insn (XEXP (*v->location, 0),
+ gen_rtx_MINUS
+ (GET_MODE (*v->location),
+ v->new_reg,
+ XEXP (*v->location, 1))));
else
{
/* If it wasn't a reg, create a pseudo and use that. */
--
Alexandre Oliva http://www.ic.unicamp.br/~oliva/
Red Hat Compiler Engineer [EMAIL PROTECTED], gcc.gnu.org}
Free Software Evangelist [EMAIL PROTECTED], gnu.org}
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20126
