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* [Bug target/39717] New: [cond-optab] CSE does not put subregs into COMPAREs on many CC0 machines
@ 2009-04-10 12:46 bonzini at gnu dot org
2009-04-16 3:08 ` [Bug target/39717] " hp at gcc dot gnu dot org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: bonzini at gnu dot org @ 2009-04-10 12:46 UTC (permalink / raw)
To: gcc-bugs
/* cris and mn10300 -O2 */
foo (float *c)
{
union
{
float r;
unsigned int i;
}
e;
e.r = c[0];
if (e.i < 0x3f7f0000) return (e.r = e.r / 2.0f, e.i);
return ((int) e.i < 0) ? 0 : 255;
}
Probably this is a duplicate too for vax:
int a, b;
int baz (short x) { return x; }
int bar (int x) {
if (baz (a ^ x ^ a)) return b;
return 0;
}
int foo (void) {
return bar (a == 0 || 1 == 1 - a) ? 1 : bar (1 && a);
}
--
Summary: [cond-optab] CSE does not put subregs into COMPAREs on
many CC0 machines
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: bonzini at gnu dot org
OtherBugsDependingO 39714
nThis:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39717
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/39717] [cond-optab] CSE does not put subregs into COMPAREs on many CC0 machines
2009-04-10 12:46 [Bug target/39717] New: [cond-optab] CSE does not put subregs into COMPAREs on many CC0 machines bonzini at gnu dot org
@ 2009-04-16 3:08 ` hp at gcc dot gnu dot org
2009-04-16 8:05 ` bonzini at gnu dot org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: hp at gcc dot gnu dot org @ 2009-04-16 3:08 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from hp at gcc dot gnu dot org 2009-04-16 03:08 -------
Is this a cond-optab regression or "just" an observation?
--
hp at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hp at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39717
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/39717] [cond-optab] CSE does not put subregs into COMPAREs on many CC0 machines
2009-04-10 12:46 [Bug target/39717] New: [cond-optab] CSE does not put subregs into COMPAREs on many CC0 machines bonzini at gnu dot org
2009-04-16 3:08 ` [Bug target/39717] " hp at gcc dot gnu dot org
@ 2009-04-16 8:05 ` bonzini at gnu dot org
2009-05-12 12:06 ` [Bug target/39717] [4.5 Regression][cond-optab] " bonzini at gnu dot org
2009-07-14 22:38 ` bonzini at gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: bonzini at gnu dot org @ 2009-04-16 8:05 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from bonzini at gnu dot org 2009-04-16 08:04 -------
Subject: Re: [cond-optab] CSE does not put subregs into
COMPAREs on many CC0 machines
> Is this a cond-optab regression or "just" an observation?
Yes, it causes extra moves on code using unions. Where we have
r20:SI=r19:SF#0 where X#0 = (subreg X 0)
cc0=r20:SI
is now
r20:SI=r19:SF#0
cc0=cmp(r20:SI,0)
and CSE is somehow not able to turn it into
cc0=cmp(r19:SF#0,0)
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39717
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/39717] [4.5 Regression][cond-optab] CSE does not put subregs into COMPAREs on many CC0 machines
2009-04-10 12:46 [Bug target/39717] New: [cond-optab] CSE does not put subregs into COMPAREs on many CC0 machines bonzini at gnu dot org
2009-04-16 3:08 ` [Bug target/39717] " hp at gcc dot gnu dot org
2009-04-16 8:05 ` bonzini at gnu dot org
@ 2009-05-12 12:06 ` bonzini at gnu dot org
2009-07-14 22:38 ` bonzini at gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: bonzini at gnu dot org @ 2009-05-12 12:06 UTC (permalink / raw)
To: gcc-bugs
--
bonzini at gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
Summary|[cond-optab] CSE does not |[4.5 Regression][cond-optab]
|put subregs into COMPAREs on|CSE does not put subregs
|many CC0 machines |into COMPAREs on many CC0
| |machines
Target Milestone|--- |4.5.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39717
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/39717] [4.5 Regression][cond-optab] CSE does not put subregs into COMPAREs on many CC0 machines
2009-04-10 12:46 [Bug target/39717] New: [cond-optab] CSE does not put subregs into COMPAREs on many CC0 machines bonzini at gnu dot org
` (2 preceding siblings ...)
2009-05-12 12:06 ` [Bug target/39717] [4.5 Regression][cond-optab] " bonzini at gnu dot org
@ 2009-07-14 22:38 ` bonzini at gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: bonzini at gnu dot org @ 2009-07-14 22:38 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from bonzini at gnu dot org 2009-07-14 22:38 -------
Fixed by the new SRA thanks to its usage of VIEW_CONVERT_EXPR at the tree
level.
--
bonzini at gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39717
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2009-07-14 22:38 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2009-04-10 12:46 [Bug target/39717] New: [cond-optab] CSE does not put subregs into COMPAREs on many CC0 machines bonzini at gnu dot org
2009-04-16 3:08 ` [Bug target/39717] " hp at gcc dot gnu dot org
2009-04-16 8:05 ` bonzini at gnu dot org
2009-05-12 12:06 ` [Bug target/39717] [4.5 Regression][cond-optab] " bonzini at gnu dot org
2009-07-14 22:38 ` bonzini at gnu dot org
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