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[Bug math/20495] SIMD sincosf implementation lacks VEX encoded version
- From: "andrew.n.senkevich at gmail dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Thu, 25 Aug 2016 19:20:30 +0000
- Subject: [Bug math/20495] SIMD sincosf implementation lacks VEX encoded version
- Auto-submitted: auto-generated
- References: <bug-20495-131@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=20495
--- Comment #6 from Andrew Senkevich <andrew.n.senkevich at gmail dot com> ---
Looks like performance drop caused by
commit f3dcae82d54e5097e18e1d6ef4ff55c2ea4e621e
Save and restore vector registers in x86-64 ld.so
because it adds save/restore of YMM registers (with AVX instructions) before
call to sinf() implemented in SSE.
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