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From: "luc.vanoostenryck at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/100378] New: [Regression 9/10/11/12] arm64: lsl + asr used instead of sxth Date: Sat, 01 May 2021 19:30:34 +0000 [thread overview] Message-ID: <bug-100378-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100378 Bug ID: 100378 Summary: [Regression 9/10/11/12] arm64: lsl + asr used instead of sxth Product: gcc Version: 12.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: rtl-optimization Assignee: unassigned at gcc dot gnu.org Reporter: luc.vanoostenryck at gmail dot com Target Milestone: --- Created attachment 50727 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50727&action=edit testcase On arm64, when compiling with optimization, for example with -O2, the following code: struct sh { short a; short b; short y[2]; }; int fooh(struct sh s) { return s.a; } produces the following assembly code since GCC9.x: fooh: lsl x0, x0, 16 asr w0, w0, 16 ret but with GCC8.x and before it produces the shorter: fooh(sh): sxth w0, w0 ret See https://gcc.godbolt.org/z/YrW7E3cro
next reply other threads:[~2021-05-01 19:30 UTC|newest] Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-05-01 19:30 luc.vanoostenryck at gmail dot com [this message] 2021-05-02 2:17 ` [Bug target/100378] [9/10/11/12 Regression] " pinskia at gcc dot gnu.org 2021-05-02 2:32 ` pinskia at gcc dot gnu.org 2021-05-03 8:02 ` rguenth at gcc dot gnu.org 2021-06-01 8:20 ` rguenth at gcc dot gnu.org 2022-01-20 13:56 ` rguenth at gcc dot gnu.org 2022-05-27 9:45 ` [Bug target/100378] [10/11/12/13 " rguenth at gcc dot gnu.org 2022-06-28 10:44 ` jakub at gcc dot gnu.org 2023-07-07 10:39 ` [Bug target/100378] [11/12/13/14 " rguenth at gcc dot gnu.org
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