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3 Commits

Author SHA1 Message Date
Andrew Trick
a3b10b8359 LSR: teach isSimplifiedLoopNest to handle PHI IVUsers. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153132 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-03-20 21:24:44 +00:00
Andrew Trick
f9492288bb LSR: fix IVUsers isSimplifiedLoopNest to perform a full domtree walk 
instead of skipping the current loop.

My prior fix was incomplete because of an overzealous compile-time optimization:
Better fix for: <rdar://problem/11049788> Segmentation fault: 11 in LoopStrengthReduce

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153131 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-03-20 21:24:40 +00:00
Andrew Trick
75ae20366f LSR fix: Add isSimplifiedLoopNest to IVUsers analysis. 
Only record IVUsers that are dominated by simplified loop
headers. Otherwise SCEVExpander will crash while looking for a
preheader.

I previously tried to work around this in LSR itself, but that was
insufficient. This way, LSR can continue to run if some uses are not
in simple loops, as long as we don't attempt to analyze those users.

Fixes <rdar://problem/11049788> Segmentation fault: 11 in LoopStrengthReduce

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152892 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-03-16 03:16:56 +00:00