--- Comment #6 from rguenth at gcc dot gnu dot org 2008-11-02 15:27 ---
Subject: Bug 37542
Author: rguenth
Date: Sun Nov 2 15:26:04 2008
New Revision: 141534
URL: http://gcc.gnu.org/viewcvs?root=gccview=revrev=141534
Log:
2008-11-02 Richard Guenther [EMAIL PROTECTED]
PR
--- Comment #7 from rguenth at gcc dot gnu dot org 2008-11-02 15:27 ---
Fixed as far as constants are concerned. For the non-constant case I'll open
another bug.
--
rguenth at gcc dot gnu dot org changed:
What|Removed |Added
--- Comment #4 from rguenth at gcc dot gnu dot org 2008-11-01 17:11 ---
We need to be careful with simplifying to SSA_NAMEs as the following example
shows:
int foo (int i, int b)
{
int mask;
int result;
if (b)
mask = -1;
else
mask = 0;
result = i + 1;
result =
--- Comment #5 from rguenth at gcc dot gnu dot org 2008-11-01 17:12 ---
Created an attachment (id=16609)
-- (http://gcc.gnu.org/bugzilla/attachment.cgi?id=16609action=view)
preliminary patch
preliminary patch, only dealing with optimizing to constants.
--
--
mmitchel at gcc dot gnu dot org changed:
What|Removed |Added
Priority|P3 |P2
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37542
--- Comment #3 from rguenth at gcc dot gnu dot org 2008-09-22 12:20 ---
Current PRE simplifies only a subset of previous PRE - see
tree-ssa-pre.c:fully_constant_expression.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37542
--- Comment #2 from rguenth at gcc dot gnu dot org 2008-09-16 15:34 ---
Hm, actually this is a regression :/ 4.3 produces
foo (i, b)
{
int prephitmp.7;
int pretmp.6;
int j;
int D.1550;
bb 2:
if (b_3(D) != 0)
goto bb 3;
else
goto bb 5;
bb 5:
pretmp.6_8 = 1 -
