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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) -- links below jump to the message on this page -- 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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