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* [Bug middle-end/23666] New: Fold does not reduce C - ~a into a + (C+1) @ 2005-09-01 1:42 pinskia at gcc dot gnu dot org 2005-09-01 6:20 ` [Bug middle-end/23666] " falk at debian dot org ` (2 more replies) 0 siblings, 3 replies; 4+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-09-01 1:42 UTC (permalink / raw) To: gcc-bugs The asm for the following two functions should be the same. int f(int a) { return 10 - ~a; } int f1(int a) { return a + 11; } Found while reading LLVM's instruction combiner. -- Summary: Fold does not reduce C - ~a into a + (C+1) Product: gcc Version: 4.1.0 Status: UNCONFIRMED Keywords: missed-optimization Severity: enhancement Priority: P2 Component: middle-end AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: pinskia at gcc dot gnu dot org CC: gcc-bugs at gcc dot gnu dot org OtherBugsDependingO 19987 nThis: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23666 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/23666] Fold does not reduce C - ~a into a + (C+1) 2005-09-01 1:42 [Bug middle-end/23666] New: Fold does not reduce C - ~a into a + (C+1) pinskia at gcc dot gnu dot org @ 2005-09-01 6:20 ` falk at debian dot org 2005-09-01 12:00 ` pinskia at gcc dot gnu dot org 2005-09-17 2:11 ` pinskia at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: falk at debian dot org @ 2005-09-01 6:20 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From falk at debian dot org 2005-09-01 06:19 ------- Works for me on alphaev68-unknown-linux-gnu tiw with 4.1.0 20050819. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23666 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/23666] Fold does not reduce C - ~a into a + (C+1) 2005-09-01 1:42 [Bug middle-end/23666] New: Fold does not reduce C - ~a into a + (C+1) pinskia at gcc dot gnu dot org 2005-09-01 6:20 ` [Bug middle-end/23666] " falk at debian dot org @ 2005-09-01 12:00 ` pinskia at gcc dot gnu dot org 2005-09-17 2:11 ` pinskia at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-09-01 12:00 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-09-01 11:59 ------- (In reply to comment #1) > Works for me on alphaev68-unknown-linux-gnu > tiw with 4.1.0 20050819. And does not with 4.1.0 20050901 on i686-pc-linux-gnu or on powerpc-darwin. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23666 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/23666] Fold does not reduce C - ~a into a + (C+1) 2005-09-01 1:42 [Bug middle-end/23666] New: Fold does not reduce C - ~a into a + (C+1) pinskia at gcc dot gnu dot org 2005-09-01 6:20 ` [Bug middle-end/23666] " falk at debian dot org 2005-09-01 12:00 ` pinskia at gcc dot gnu dot org @ 2005-09-17 2:11 ` pinskia at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-09-17 2:11 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-09-17 02:11 ------- Confirmed. -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever Confirmed| |1 Last reconfirmed|0000-00-00 00:00:00 |2005-09-17 02:11:51 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23666 ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2005-09-17 2:11 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2005-09-01 1:42 [Bug middle-end/23666] New: Fold does not reduce C - ~a into a + (C+1) pinskia at gcc dot gnu dot org 2005-09-01 6:20 ` [Bug middle-end/23666] " falk at debian dot org 2005-09-01 12:00 ` pinskia at gcc dot gnu dot org 2005-09-17 2:11 ` pinskia at gcc dot gnu dot org
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