[Bug dynamic-link/20508] New: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512 cause transition penalty

["hjl.tools at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

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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