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* [Bug rtl-optimization/60159] New: improve code for conditional sibcall @ 2014-02-12 11:24 jay.foad at gmail dot com 2014-02-12 12:20 ` [Bug rtl-optimization/60159] " jakub at gcc dot gnu.org ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: jay.foad at gmail dot com @ 2014-02-12 11:24 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60159 Bug ID: 60159 Summary: improve code for conditional sibcall Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: rtl-optimization Assignee: unassigned at gcc dot gnu.org Reporter: jay.foad at gmail dot com If I compile this code for x86-64 I get: $ cat jcc.c extern int f(int x); int g(int x) { return x > 3 ? f(x) : x; } $ cc1 -quiet -O3 jcc.c -o - ... g: .LFB0: .cfi_startproc cmpl $3, %edi jg .L4 movl %edi, %eax ret .p2align 4,,10 .p2align 3 .L4: jmp f .cfi_endproc This code would be simpler and shorter if the jg-to-jmp sequence was replaced with a single "jg f" instruction. I'm using gcc built from svn trunk r207717. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug rtl-optimization/60159] improve code for conditional sibcall 2014-02-12 11:24 [Bug rtl-optimization/60159] New: improve code for conditional sibcall jay.foad at gmail dot com @ 2014-02-12 12:20 ` jakub at gcc dot gnu.org 2014-03-07 17:20 ` law at redhat dot com ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: jakub at gcc dot gnu.org @ 2014-02-12 12:20 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60159 Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jakub at gcc dot gnu.org --- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Not sure if that is desirable though, it will mess up debug/unwind info. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug rtl-optimization/60159] improve code for conditional sibcall 2014-02-12 11:24 [Bug rtl-optimization/60159] New: improve code for conditional sibcall jay.foad at gmail dot com 2014-02-12 12:20 ` [Bug rtl-optimization/60159] " jakub at gcc dot gnu.org @ 2014-03-07 17:20 ` law at redhat dot com 2015-02-09 18:49 ` [Bug target/60159] " pinskia at gcc dot gnu.org 2021-08-19 3:31 ` pinskia at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: law at redhat dot com @ 2014-03-07 17:20 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60159 Jeffrey A. Law <law at redhat dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |law at redhat dot com --- Comment #2 from Jeffrey A. Law <law at redhat dot com> --- Lots of things mess up debug info :-) This seems reasonably desirable to me and shouldn't be terribly difficult to implement, possibly guarding it on -Og. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/60159] improve code for conditional sibcall 2014-02-12 11:24 [Bug rtl-optimization/60159] New: improve code for conditional sibcall jay.foad at gmail dot com 2014-02-12 12:20 ` [Bug rtl-optimization/60159] " jakub at gcc dot gnu.org 2014-03-07 17:20 ` law at redhat dot com @ 2015-02-09 18:49 ` pinskia at gcc dot gnu.org 2021-08-19 3:31 ` pinskia at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu.org @ 2015-02-09 18:49 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60159 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target| |i?86-*-* x86_64-*-* Status|UNCONFIRMED |NEW Last reconfirmed| |2015-02-09 Component|rtl-optimization |target Ever confirmed|0 |1 Severity|normal |enhancement --- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- This is a target specific bug because most other targets don't have the range for their conditional branches compared to their normal jumps. Confirmed. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/60159] improve code for conditional sibcall 2014-02-12 11:24 [Bug rtl-optimization/60159] New: improve code for conditional sibcall jay.foad at gmail dot com ` (2 preceding siblings ...) 2015-02-09 18:49 ` [Bug target/60159] " pinskia at gcc dot gnu.org @ 2021-08-19 3:31 ` pinskia at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu.org @ 2021-08-19 3:31 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60159 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |DUPLICATE Status|NEW |RESOLVED --- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Dup of bug 47253. *** This bug has been marked as a duplicate of bug 47253 *** ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2021-08-19 3:31 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2014-02-12 11:24 [Bug rtl-optimization/60159] New: improve code for conditional sibcall jay.foad at gmail dot com 2014-02-12 12:20 ` [Bug rtl-optimization/60159] " jakub at gcc dot gnu.org 2014-03-07 17:20 ` law at redhat dot com 2015-02-09 18:49 ` [Bug target/60159] " pinskia at gcc dot gnu.org 2021-08-19 3:31 ` pinskia at gcc dot gnu.org
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