Re: [Boost-bugs] [Boost C++ Libraries] #8509: SSE/AVX optimization and C++11 support

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #8509: SSE/AVX optimization and C++11 support
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-09-26 07:12:35

#8509: SSE/AVX optimization and C++11 support
  Reporter: andysem | Owner: atompkins
      Type: Patches | Status: closed
 Milestone: To Be Determined | Component: uuid
   Version: Boost 1.53.0 | Severity: Optimization
Resolution: fixed | Keywords:

Comment (by hajokirchhoff <mailinglists@…>):

 I'll try to reproduce it. I am using /O2 and "no whole program
 optimization". The problem is that the optimizer will usually produce code
 like this:
 000000013F2110DA movdqu xmm0,xmmword ptr [rsp+48h]
 000000013F2110E0 movdqu xmm1,xmmword ptr [rax+10h]
 000000013F2110E5 pcmpeqd xmm1,xmm0
 000000013F2110E9 pmovmskb eax,xmm1
 000000013F2110ED cmp eax,0FFFFh
 It's only when the register xmm0 is already assigned a different variable
 that the optimizer will then produce the problematic opcode. I need to
 find a way to reproduce that specific scenario. The bug manifests itself
 in a 29MB binary of an application I am currently porting from VS2008 to
 VS2013 (and boost 1.55 to boost 1.56).

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