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* [Bug c/107445] New: Redundant moves for subregs move @ 2022-10-27 22:50 juzhe.zhong at rivai dot ai 2022-10-27 22:58 ` [Bug target/107445] " pinskia at gcc dot gnu.org ` (2 more replies) 0 siblings, 3 replies; 4+ messages in thread From: juzhe.zhong at rivai dot ai @ 2022-10-27 22:50 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107445 Bug ID: 107445 Summary: Redundant moves for subregs move Product: gcc Version: 13.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: juzhe.zhong at rivai dot ai Target Milestone: --- Here is the testcase: https://godbolt.org/z/4bcfx5a86 coalesce: ld4d {z24.d - z27.d}, p0/z, [x0] mov z5.d, z24.d mov z4.d, z25.d mov z3.d, z26.d mov z2.d, z27.d cmp w1, 0 ble .L2 mov w0, 0 ld1d z1.d, p0/z, [x2] ld1d z0.d, p0/z, [x3] .L3: add w0, w0, 1 movprfx z5.d, p0/z, z5.d mad z5.d, p0/m, z1.d, z0.d movprfx z4.d, p0/z, z4.d mad z4.d, p0/m, z1.d, z0.d movprfx z3.d, p0/z, z3.d mad z3.d, p0/m, z1.d, z0.d movprfx z2.d, p0/z, z2.d mad z2.d, p0/m, z1.d, z0.d cmp w1, w0 bne .L3 It's obvious that we should be able to directly use z24 - z27 to perform mad oberation and remove the redundant moves in the prologue. I tried to implement register coalescing in IRA to fix it, but I am not sure whether it's a good idea to fix it? ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug target/107445] Redundant moves for subregs move 2022-10-27 22:50 [Bug c/107445] New: Redundant moves for subregs move juzhe.zhong at rivai dot ai @ 2022-10-27 22:58 ` pinskia at gcc dot gnu.org 2022-10-27 22:59 ` pinskia at gcc dot gnu.org 2022-10-27 23:00 ` pinskia at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu.org @ 2022-10-27 22:58 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107445 --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Created attachment 53783 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53783&action=edit testcase ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug target/107445] Redundant moves for subregs move 2022-10-27 22:50 [Bug c/107445] New: Redundant moves for subregs move juzhe.zhong at rivai dot ai 2022-10-27 22:58 ` [Bug target/107445] " pinskia at gcc dot gnu.org @ 2022-10-27 22:59 ` pinskia at gcc dot gnu.org 2022-10-27 23:00 ` pinskia at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu.org @ 2022-10-27 22:59 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107445 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Comment on attachment 53783 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53783 testcase Compile at -march=armv8.8-a+sve -O3 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug target/107445] Redundant moves for subregs move 2022-10-27 22:50 [Bug c/107445] New: Redundant moves for subregs move juzhe.zhong at rivai dot ai 2022-10-27 22:58 ` [Bug target/107445] " pinskia at gcc dot gnu.org 2022-10-27 22:59 ` pinskia at gcc dot gnu.org @ 2022-10-27 23:00 ` pinskia at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu.org @ 2022-10-27 23:00 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107445 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |DUPLICATE Status|UNCONFIRMED |RESOLVED --- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Exact dup of bug 106694. *** This bug has been marked as a duplicate of bug 106694 *** ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2022-10-27 23:00 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2022-10-27 22:50 [Bug c/107445] New: Redundant moves for subregs move juzhe.zhong at rivai dot ai 2022-10-27 22:58 ` [Bug target/107445] " pinskia at gcc dot gnu.org 2022-10-27 22:59 ` pinskia at gcc dot gnu.org 2022-10-27 23:00 ` pinskia at gcc dot gnu.org
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