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* [Bug tree-optimization/30978] New: Does not propagate comparison results
@ 2007-02-27 10:53 rguenth at gcc dot gnu dot org
2007-02-27 16:15 ` [Bug tree-optimization/30978] " rguenth at gcc dot gnu dot org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2007-02-27 10:53 UTC (permalink / raw)
To: gcc-bugs
int foo(int a)
{
unsigned int b = a > 0;
char c = b;
return c;
}
is not optimized to
int foo(int a)
{
return a > 0;
}
at the tree level. Forwprop has code to do this if the final propagation
result is in a COND_EXPR.
I have a patch.
--
Summary: Does not propagate comparison results
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Keywords: missed-optimization, TREE
Severity: enhancement
Priority: P3
Component: tree-optimization
AssignedTo: rguenth at gcc dot gnu dot org
ReportedBy: rguenth at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30978
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/30978] Does not propagate comparison results
2007-02-27 10:53 [Bug tree-optimization/30978] New: Does not propagate comparison results rguenth at gcc dot gnu dot org
@ 2007-02-27 16:15 ` rguenth at gcc dot gnu dot org
2007-04-27 13:44 ` rguenth at gcc dot gnu dot org
2007-04-27 14:06 ` rguenth at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2007-02-27 16:15 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from rguenth at gcc dot gnu dot org 2007-02-27 16:15 -------
Patch posted.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
URL| |http://gcc.gnu.org/ml/gcc-
| |patches/2007-
| |02/msg02123.html
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30978
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/30978] Does not propagate comparison results
2007-02-27 10:53 [Bug tree-optimization/30978] New: Does not propagate comparison results rguenth at gcc dot gnu dot org
2007-02-27 16:15 ` [Bug tree-optimization/30978] " rguenth at gcc dot gnu dot org
@ 2007-04-27 13:44 ` rguenth at gcc dot gnu dot org
2007-04-27 14:06 ` rguenth at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2007-04-27 13:44 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from rguenth at gcc dot gnu dot org 2007-04-27 14:44 -------
Subject: Bug 30978
Author: rguenth
Date: Fri Apr 27 14:43:42 2007
New Revision: 124217
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=124217
Log:
2007-04-27 Richard Guenther <rguenther@suse.de>
PR tree-optimization/30965
PR tree-optimization/30978
* Makefile.in (tree-ssa-forwprop.o): Depend on $(FLAGS_H).
* tree-ssa-forwprop.c (forward_propagate_into_cond_1): Remove.
(find_equivalent_equality_comparison): Likewise.
(simplify_cond): Likewise.
(get_prop_source_stmt): New helper.
(get_prop_dest_stmt): Likewise.
(can_propagate_from): Likewise.
(remove_prop_source_from_use): Likewise.
(combine_cond_expr_cond): Likewise.
(forward_propagate_comparison): New function.
(forward_propagate_into_cond): Rewrite to use fold for
tree combining.
(tree_ssa_forward_propagate_single_use_vars): Call
forward_propagate_comparison to propagate comparisons.
* gcc.dg/tree-ssa/pr30978.c: New testcase.
* gcc.dg/tree-ssa/bool-3.c: Remove XFAIL, explain why.
* gcc.dg/tree-ssa/ssa-fre-4.c: Use char instead of bool
* gcc.dg/strict-overflow-5.c: Adjust tree dump scanning.
Added:
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr30978.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/Makefile.in
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/strict-overflow-5.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/bool-3.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-4.c
trunk/gcc/tree-ssa-forwprop.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30978
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/30978] Does not propagate comparison results
2007-02-27 10:53 [Bug tree-optimization/30978] New: Does not propagate comparison results rguenth at gcc dot gnu dot org
2007-02-27 16:15 ` [Bug tree-optimization/30978] " rguenth at gcc dot gnu dot org
2007-04-27 13:44 ` rguenth at gcc dot gnu dot org
@ 2007-04-27 14:06 ` rguenth at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2007-04-27 14:06 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from rguenth at gcc dot gnu dot org 2007-04-27 15:06 -------
Fixed.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |FIXED
Target Milestone|--- |4.3.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30978
^ permalink raw reply [flat|nested] 4+ messages in thread
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2007-02-27 10:53 [Bug tree-optimization/30978] New: Does not propagate comparison results rguenth at gcc dot gnu dot org
2007-02-27 16:15 ` [Bug tree-optimization/30978] " rguenth at gcc dot gnu dot org
2007-04-27 13:44 ` rguenth at gcc dot gnu dot org
2007-04-27 14:06 ` rguenth at gcc dot gnu dot org
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