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[Bug dynamic-link/20508] New: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512 cause transition penalty
- From: "hjl.tools at gmail dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Tue, 23 Aug 2016 15:40:38 +0000
- Subject: [Bug dynamic-link/20508] New: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512 cause transition penalty
- Auto-submitted: auto-generated
https://sourceware.org/bugzilla/show_bug.cgi?id=20508
Bug ID: 20508
Summary: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
cause transition penalty
Product: glibc
Version: 2.25
Status: NEW
Severity: normal
Priority: P2
Component: dynamic-link
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
Target: x86-64
There is transition penalty when SSE instructions are mixed with 256-bit
AVX or 512-bit AVX512 instructions. Since _dl_runtime_resolve_avx and
_dl_runtime_profile_avx512 save and restore 256-bit YMM/512-bit ZMM
registers, there is transition penalty for SSE instructions with lazy
binding.
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