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Fix LSR's OptimizeSMax to ignore max operators with more than 2 operands, 

which it isn't prepared to handle.

llvm-svn: 73787
This commit is contained in:
Dan Gohman 2009-06-19 23:03:46 +00:00
parent da10358c84
commit 55e3dd9174
1 changed files with 5 additions and 0 deletions
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5
llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -2116,6 +2116,11 @@ ICmpInst *LoopStrengthReduce::OptimizeSMax(Loop *L, ICmpInst *Cond,
const SCEVSMaxExpr *SMax = dyn_cast<SCEVSMaxExpr>(IterationCount);
if (!SMax || SMax != SE->getSCEV(Sel)) return Cond;
// Two handle a max with more than two operands, this optimization would
// require additional checking and setup.
if (SMax->getNumOperands() != 2)
return Cond;
SCEVHandle SMaxLHS = SMax->getOperand(0);
SCEVHandle SMaxRHS = SMax->getOperand(1);
if (!SMaxLHS || SMaxLHS != One) return Cond;