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* [Bug tree-optimization/19792] Missed optimizations due to signedness in the way [not found] <bug-19792-5009@http.gcc.gnu.org/bugzilla/> @ 2006-05-04 13:57 ` rguenth at gcc dot gnu dot org 2006-05-04 15:04 ` rguenth at gcc dot gnu dot org 2006-05-05 9:17 ` pinskia at gcc dot gnu dot org 2 siblings, 0 replies; 9+ messages in thread From: rguenth at gcc dot gnu dot org @ 2006-05-04 13:57 UTC (permalink / raw) To: gcc-bugs ------- Comment #4 from rguenth at gcc dot gnu dot org 2006-05-04 13:57 ------- Subject: Bug 19792 Author: rguenth Date: Thu May 4 13:56:52 2006 New Revision: 113527 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=113527 Log: 2006-05-04 Richard Guenther <rguenther@suse.de> PR tree-optimization/14287 PR tree-optimization/14844 PR tree-optimization/19792 PR tree-optimization/21608 PR tree-optimization/27090 * tree-ssa-pre.c (try_combine_conversion): New function. (compute_avail): After constructing the value-handle expression, use try_combine_conversion to combine NOP_EXPRs with previous value-handle expressions and use the result if it is available. * gcc.dg/tree-ssa/ssa-fre-1.c: New testcase. * gcc.dg/tree-ssa/ssa-fre-2.c: Likewise. * gcc.dg/tree-ssa/ssa-fre-3.c: Likewise. * gcc.dg/tree-ssa/ssa-fre-4.c: Likewise. * gcc.dg/tree-ssa/ssa-fre-5.c: Likewise. Added: trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-1.c trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-2.c trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-3.c trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-4.c trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-5.c Modified: trunk/gcc/ChangeLog trunk/gcc/testsuite/ChangeLog trunk/gcc/tree-ssa-pre.c -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19792 ^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/19792] Missed optimizations due to signedness in the way [not found] <bug-19792-5009@http.gcc.gnu.org/bugzilla/> 2006-05-04 13:57 ` [Bug tree-optimization/19792] Missed optimizations due to signedness in the way rguenth at gcc dot gnu dot org @ 2006-05-04 15:04 ` rguenth at gcc dot gnu dot org 2006-05-05 9:17 ` pinskia at gcc dot gnu dot org 2 siblings, 0 replies; 9+ messages in thread From: rguenth at gcc dot gnu dot org @ 2006-05-04 15:04 UTC (permalink / raw) To: gcc-bugs ------- Comment #5 from rguenth at gcc dot gnu dot org 2006-05-04 15:04 ------- bar is now fixed. ;; Function foo (foo) Analyzing Edge Insertions. foo (t) { <bb 2>: return size_lookup[(int) t] == size_lookup[t]; } ;; Function bar (bar) Analyzing Edge Insertions. bar (t) { <bb 2>: return 1; } -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19792 ^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/19792] Missed optimizations due to signedness in the way [not found] <bug-19792-5009@http.gcc.gnu.org/bugzilla/> 2006-05-04 13:57 ` [Bug tree-optimization/19792] Missed optimizations due to signedness in the way rguenth at gcc dot gnu dot org 2006-05-04 15:04 ` rguenth at gcc dot gnu dot org @ 2006-05-05 9:17 ` pinskia at gcc dot gnu dot org 2 siblings, 0 replies; 9+ messages in thread From: pinskia at gcc dot gnu dot org @ 2006-05-05 9:17 UTC (permalink / raw) To: gcc-bugs ------- Comment #6 from pinskia at gcc dot gnu dot org 2006-05-05 09:17 ------- the issue for foo might be considered a different harder issue to resolve. I think we need to decide what type is the argument for the ARRAY_REF, is it the type which the ARRAY has for its bounds or some other type? -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19792 ^ permalink raw reply [flat|nested] 9+ messages in thread
[parent not found: <bug-19792-4@http.gcc.gnu.org/bugzilla/>]
* [Bug tree-optimization/19792] Missed optimizations due to signedness in the way [not found] <bug-19792-4@http.gcc.gnu.org/bugzilla/> @ 2014-10-31 4:02 ` pinskia at gcc dot gnu.org 0 siblings, 0 replies; 9+ messages in thread From: pinskia at gcc dot gnu.org @ 2014-10-31 4:02 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19792 Bug 19792 depends on bug 15459, which changed state. Bug 15459 Summary: [meta-bug] there should be a tree combiner like the rtl one https://gcc.gnu.org/bugzilla/show_bug.cgi?id=15459 What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED ^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/19792] New: Missed optimizations due to signedness in the way
@ 2005-02-06 13:21 kazu@cs.umass.edu
2005-02-06 13:21 ` [Bug tree-optimization/19792] " kazu@cs.umass.edu
` (4 more replies)
0 siblings, 5 replies; 9+ messages in thread
From: kazu@cs.umass.edu @ 2005-02-06 13:21 UTC (permalink / raw)
To: gcc-bugs
Consider:
extern unsigned char size_lookup[257];
int
foo (unsigned int t)
{
return (size_lookup [(int) t] == size_lookup[t]);
}
int
bar (unsigned int t)
{
int a = t;
return a == t;
}
Both functions should return 1, and in fact that's what the RTL optimizers
notice, but the tree optimizers don't.
This is somewhat related to PR 19790.
--
Summary: Missed optimizations due to signedness in the way
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: missed-optimization, TREE
Severity: enhancement
Priority: P2
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: kazu at cs dot umass dot edu
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19792
^ permalink raw reply [flat|nested] 9+ messages in thread* [Bug tree-optimization/19792] Missed optimizations due to signedness in the way 2005-02-06 13:21 [Bug tree-optimization/19792] New: " kazu@cs.umass.edu @ 2005-02-06 13:21 ` kazu@cs.umass.edu 2005-02-06 15:34 ` kazu@cs.umass.edu ` (3 subsequent siblings) 4 siblings, 0 replies; 9+ messages in thread From: kazu@cs.umass.edu @ 2005-02-06 13:21 UTC (permalink / raw) To: gcc-bugs -- What |Removed |Added ---------------------------------------------------------------------------- CC| |stevenb at suse dot de http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19792 ^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/19792] Missed optimizations due to signedness in the way 2005-02-06 13:21 [Bug tree-optimization/19792] New: " kazu@cs.umass.edu 2005-02-06 13:21 ` [Bug tree-optimization/19792] " kazu@cs.umass.edu @ 2005-02-06 15:34 ` kazu@cs.umass.edu 2005-02-06 16:17 ` pinskia@gcc.gnu.org ` (2 subsequent siblings) 4 siblings, 0 replies; 9+ messages in thread From: kazu@cs.umass.edu @ 2005-02-06 15:34 UTC (permalink / raw) To: gcc-bugs -- What |Removed |Added ---------------------------------------------------------------------------- OtherBugsDependingO| |19721 nThis| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19792 ^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/19792] Missed optimizations due to signedness in the way 2005-02-06 13:21 [Bug tree-optimization/19792] New: " kazu@cs.umass.edu 2005-02-06 13:21 ` [Bug tree-optimization/19792] " kazu@cs.umass.edu 2005-02-06 15:34 ` kazu@cs.umass.edu @ 2005-02-06 16:17 ` pinskia@gcc.gnu.org 2005-02-13 20:56 ` kazu at cs dot umass dot edu 2005-03-16 14:59 ` kazu at cs dot umass dot edu 4 siblings, 0 replies; 9+ messages in thread From: pinskia@gcc.gnu.org @ 2005-02-06 16:17 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-02-06 16:17 ------- Confirmed, For bar, my tree combiner fixes the missed optimization. Not for foo. -- What |Removed |Added ---------------------------------------------------------------------------- BugsThisDependsOn| |15459 Status|UNCONFIRMED |NEW Ever Confirmed| |1 Last reconfirmed|0000-00-00 00:00:00 |2005-02-06 16:17:02 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19792 ^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/19792] Missed optimizations due to signedness in the way 2005-02-06 13:21 [Bug tree-optimization/19792] New: " kazu@cs.umass.edu ` (2 preceding siblings ...) 2005-02-06 16:17 ` pinskia@gcc.gnu.org @ 2005-02-13 20:56 ` kazu at cs dot umass dot edu 2005-03-16 14:59 ` kazu at cs dot umass dot edu 4 siblings, 0 replies; 9+ messages in thread From: kazu at cs dot umass dot edu @ 2005-02-13 20:56 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From kazu at cs dot umass dot edu 2005-02-13 14:17 ------- The testcase in this PR was reduced from ggc-page.c:ggc_alloc_typed_stat. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19792 ^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/19792] Missed optimizations due to signedness in the way 2005-02-06 13:21 [Bug tree-optimization/19792] New: " kazu@cs.umass.edu ` (3 preceding siblings ...) 2005-02-13 20:56 ` kazu at cs dot umass dot edu @ 2005-03-16 14:59 ` kazu at cs dot umass dot edu 4 siblings, 0 replies; 9+ messages in thread From: kazu at cs dot umass dot edu @ 2005-03-16 14:59 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From kazu at cs dot umass dot edu 2005-03-16 14:59 ------- FYI, here is the tailc dump that I get with the current mainline. ;; Function foo (foo) foo (t) { unsigned char D.1137; unsigned int t.1; unsigned char D.1135; int t.0; int D.1133; <bb 0>: t.0_2 = (int) t_1; D.1135_4 = size_lookup[t.0_2]; D.1137_6 = size_lookup[t_1]; D.1133_7 = D.1135_4 == D.1137_6; return D.1133_7; } ;; Function bar (bar) bar (t) { int a; unsigned int a.2; int D.1142; <bb 0>: a_2 = (int) t_1; a.2_3 = (unsigned int) a_2; D.1142_4 = t_1 == a.2_3; return D.1142_4; } -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19792 ^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2014-10-31 4:01 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
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[not found] <bug-19792-5009@http.gcc.gnu.org/bugzilla/>
2006-05-04 13:57 ` [Bug tree-optimization/19792] Missed optimizations due to signedness in the way rguenth at gcc dot gnu dot org
2006-05-04 15:04 ` rguenth at gcc dot gnu dot org
2006-05-05 9:17 ` pinskia at gcc dot gnu dot org
[not found] <bug-19792-4@http.gcc.gnu.org/bugzilla/>
2014-10-31 4:02 ` pinskia at gcc dot gnu.org
2005-02-06 13:21 [Bug tree-optimization/19792] New: " kazu@cs.umass.edu
2005-02-06 13:21 ` [Bug tree-optimization/19792] " kazu@cs.umass.edu
2005-02-06 15:34 ` kazu@cs.umass.edu
2005-02-06 16:17 ` pinskia@gcc.gnu.org
2005-02-13 20:56 ` kazu at cs dot umass dot edu
2005-03-16 14:59 ` kazu at cs dot umass dot edu
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