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From: "unlvsur at live dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/107563] New: __builtin_shufflevector fails to use pshufb and pshufd instructions under default x86_64 compilation toggle which is the sse2 one Date: Mon, 07 Nov 2022 22:56:27 +0000 [thread overview] Message-ID: <bug-107563-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107563 Bug ID: 107563 Summary: __builtin_shufflevector fails to use pshufb and pshufd instructions under default x86_64 compilation toggle which is the sse2 one Product: gcc Version: 13.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: rtl-optimization Assignee: unassigned at gcc dot gnu.org Reporter: unlvsur at live dot com Target Milestone: --- #if defined(__SSE2__) using temp_vec_type [[__gnu__::__vector_size__ (16)]] = char; void foo(temp_vec_type& v) noexcept { v=__builtin_shufflevector(v,v,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0); } #endif g++ -S pq.cc -Ofast proves sse2 is enabled by default, but it does not call https://www.felixcloutier.com/x86/pshufb neither https://www.felixcloutier.com/x86/pshufd while g++ -S pq.cc -Ofast -msse4.2 will generate them correctly. Which is buggy
next reply other threads:[~2022-11-07 22:56 UTC|newest] Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-11-07 22:56 unlvsur at live dot com [this message] 2022-11-07 23:00 ` [Bug target/107563] " unlvsur at live dot com 2022-11-07 23:05 ` [Bug target/107563] __builtin_shufflevector fails to " unlvsur at live dot com 2022-11-08 0:11 ` unlvsur at live dot com 2022-11-08 0:11 ` unlvsur at live dot com 2022-11-08 3:23 ` crazylht at gmail dot com 2022-11-08 3:33 ` crazylht at gmail dot com 2022-11-08 6:11 ` unlvsur at live dot com 2022-11-08 6:11 ` unlvsur at live dot com 2022-11-08 6:14 ` unlvsur at live dot com 2022-11-08 8:28 ` crazylht at gmail dot com 2024-05-15 4:47 ` cvs-commit at gcc dot gnu.org 2024-05-18 15:17 ` admin at levyhsu dot com
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