ports/178977: commit references a PR

[dfilter service]

The following reply was made to PR ports/178977; it has been noted by GNATS.

From: dfilter at FreeBSD.ORG (dfilter service)
To: bug-followup at FreeBSD.org
Cc:  
Subject: Re: ports/178977: commit references a PR
Date: Sun, 26 May 2013 14:14:49 +0000 (UTC)

 Author: dim
 Date: Sun May 26 14:14:42 2013
 New Revision: 250997
 URL: http://svnweb.freebsd.org/changeset/base/250997
 
 Log:
   Pull in r182656 from upstream llvm trunk:
   
     LoopVectorize: LoopSimplify can't canonicalize loops with an
     indirectbr in it, don't assert on those cases.
   
     Fixes PR16139.
   
   This should fix clang assertion failures when optimizing at -O3, similar
   to:
   
     Assertion failed: (TheLoop->getLoopPreheader() && "No preheader!!"),
     function canVectorize, file
     contrib/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp, line 2171.
   
   Reported by:	O. Hartmann <ohartman at zedat.fu-berlin.de>
   PR:		ports/178332, ports/178977
   MFC after:	3 days
 
 Modified:
   head/contrib/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
 
 Modified: head/contrib/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
 ==============================================================================
 --- head/contrib/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp	Sun May 26 12:36:56 2013	(r250996)
 +++ head/contrib/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp	Sun May 26 14:14:42 2013	(r250997)
 @@ -2169,7 +2169,10 @@ bool LoopVectorizationLegality::canVecto
  }
  
  bool LoopVectorizationLegality::canVectorize() {
 -  assert(TheLoop->getLoopPreheader() && "No preheader!!");
 +  // We must have a loop in canonical form. Loops with indirectbr in them cannot
 +  // be canonicalized.
 +  if (!TheLoop->getLoopPreheader())
 +    return false;
  
    // We can only vectorize innermost loops.
    if (TheLoop->getSubLoopsVector().size())
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