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* [Bug other/16801] New: PowerPC - forward store motion opportunity @ 2004-07-28 17:00 gcc-bugzilla at gcc dot gnu dot org 2004-07-28 17:36 ` [Bug target/16801] " bangerth at dealii dot org ` (5 more replies) 0 siblings, 6 replies; 7+ messages in thread From: gcc-bugzilla at gcc dot gnu dot org @ 2004-07-28 17:00 UTC (permalink / raw) To: gcc-bugs Description: A non-optimal code sequence is illustrated. There exists an opportunity to perform forward store motion. Duplicate using gcc 3.5 and command line: gcc -O3 -m64 -c test.c Testcase: typedef struct { unsigned int e; } str; char *q; void foo (char *p) { while (1) { q = p - ((str *)p)->e; if (((str *)q)->e) break; p = q; } } Assembly: .foo: lwz 0,0(3) ld 11,.LC0@toc(2) subf 3,0,3 std 3,0(11) lwz 0,0(3) cmpwi 7,0,0 bnelr- 7 mr 9,3 .L4: lwz 0,0(9) subf 9,0,9 std 9,0(11) <-- candidate for forward store motion out of the loop. lwz 0,0(9) cmpwi 7,0,0 beq+ 7,.L4 blr -- Summary: PowerPC - forward store motion opportunity Product: gcc Version: 3.5.0 Status: UNCONFIRMED Severity: enhancement Priority: P1 Component: other AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: steinmtz at us dot ibm dot com CC: gcc-bugs at gcc dot gnu dot org,steinmtz at us dot ibm dot com GCC build triplet: powerpc64-linux GCC host triplet: powerpc64-linux GCC target triplet: powerpc64-linux http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16801 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug target/16801] PowerPC - forward store motion opportunity 2004-07-28 17:00 [Bug other/16801] New: PowerPC - forward store motion opportunity gcc-bugzilla at gcc dot gnu dot org @ 2004-07-28 17:36 ` bangerth at dealii dot org 2004-07-28 18:42 ` falk at debian dot org ` (4 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: bangerth at dealii dot org @ 2004-07-28 17:36 UTC (permalink / raw) To: gcc-bugs -- What |Removed |Added ---------------------------------------------------------------------------- Component|other |target http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16801 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug target/16801] PowerPC - forward store motion opportunity 2004-07-28 17:00 [Bug other/16801] New: PowerPC - forward store motion opportunity gcc-bugzilla at gcc dot gnu dot org 2004-07-28 17:36 ` [Bug target/16801] " bangerth at dealii dot org @ 2004-07-28 18:42 ` falk at debian dot org 2004-07-29 4:53 ` [Bug tree-optimization/16801] " pinskia at gcc dot gnu dot org ` (3 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: falk at debian dot org @ 2004-07-28 18:42 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From falk at debian dot org 2004-07-28 18:42 ------- This works for me on alphev68-linux with the lno branch. Can you please try there? -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |WAITING http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16801 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/16801] PowerPC - forward store motion opportunity 2004-07-28 17:00 [Bug other/16801] New: PowerPC - forward store motion opportunity gcc-bugzilla at gcc dot gnu dot org 2004-07-28 17:36 ` [Bug target/16801] " bangerth at dealii dot org 2004-07-28 18:42 ` falk at debian dot org @ 2004-07-29 4:53 ` pinskia at gcc dot gnu dot org 2004-09-24 13:14 ` pinskia at gcc dot gnu dot org ` (2 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-07-29 4:53 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-07-29 04:53 ------- Fixed on the lno so suspendeding. -- What |Removed |Added ---------------------------------------------------------------------------- Status|WAITING |SUSPENDED Component|target |tree-optimization Keywords| |missed-optimization Target Milestone|--- |lno http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16801 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/16801] PowerPC - forward store motion opportunity 2004-07-28 17:00 [Bug other/16801] New: PowerPC - forward store motion opportunity gcc-bugzilla at gcc dot gnu dot org ` (2 preceding siblings ...) 2004-07-29 4:53 ` [Bug tree-optimization/16801] " pinskia at gcc dot gnu dot org @ 2004-09-24 13:14 ` pinskia at gcc dot gnu dot org 2004-11-11 17:27 ` nathan at gcc dot gnu dot org 2004-11-11 17:31 ` pinskia at gcc dot gnu dot org 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-09-24 13:14 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-09-24 13:14 ------- Actually this is not fixed on the lno at all. -- What |Removed |Added ---------------------------------------------------------------------------- Status|SUSPENDED |NEW Ever Confirmed| |1 Last reconfirmed|0000-00-00 00:00:00 |2004-09-24 13:14:38 date| | Target Milestone|lno |--- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16801 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/16801] PowerPC - forward store motion opportunity 2004-07-28 17:00 [Bug other/16801] New: PowerPC - forward store motion opportunity gcc-bugzilla at gcc dot gnu dot org ` (3 preceding siblings ...) 2004-09-24 13:14 ` pinskia at gcc dot gnu dot org @ 2004-11-11 17:27 ` nathan at gcc dot gnu dot org 2004-11-11 17:31 ` pinskia at gcc dot gnu dot org 5 siblings, 0 replies; 7+ messages in thread From: nathan at gcc dot gnu dot org @ 2004-11-11 17:27 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From nathan at gcc dot gnu dot org 2004-11-11 17:27 ------- This is fixed on FSF HEAD 2004-11-11. Probably due to some better alias analysis -- What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |FIXED http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16801 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/16801] PowerPC - forward store motion opportunity 2004-07-28 17:00 [Bug other/16801] New: PowerPC - forward store motion opportunity gcc-bugzilla at gcc dot gnu dot org ` (4 preceding siblings ...) 2004-11-11 17:27 ` nathan at gcc dot gnu dot org @ 2004-11-11 17:31 ` pinskia at gcc dot gnu dot org 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-11-11 17:31 UTC (permalink / raw) To: gcc-bugs -- What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|--- |4.0.0 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16801 ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2004-11-11 17:31 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2004-07-28 17:00 [Bug other/16801] New: PowerPC - forward store motion opportunity gcc-bugzilla at gcc dot gnu dot org 2004-07-28 17:36 ` [Bug target/16801] " bangerth at dealii dot org 2004-07-28 18:42 ` falk at debian dot org 2004-07-29 4:53 ` [Bug tree-optimization/16801] " pinskia at gcc dot gnu dot org 2004-09-24 13:14 ` pinskia at gcc dot gnu dot org 2004-11-11 17:27 ` nathan at gcc dot gnu dot org 2004-11-11 17:31 ` pinskia at gcc dot gnu dot org
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