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Fix PR1850 by removing an unsafe transformation from VMCore/ConstantFold.cpp.

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Reimplement the xform in Analysis/ConstantFolding.cpp where we can use
targetdata to validate that it is safe.  While I'm in there, fix some const
correctness issues and generalize the interface to the "operand folder".


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44817 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2007-12-10 22:53:04 +00:00
parent 9324665a78
commit f286f6fd93
7 changed files with 134 additions and 43 deletions
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16
lib/Analysis/ScalarEvolution.cpp
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@ -2043,7 +2043,12 @@ static Constant *EvaluateExpression(Value *V, Constant *PHIVal) {
if (Operands[i] == 0) return 0;
}
return ConstantFoldInstOperands(I, &Operands[0], Operands.size());
if (const CmpInst *CI = dyn_cast<CmpInst>(I))
return ConstantFoldCompareInstOperands(CI->getPredicate(),
&Operands[0], Operands.size());
else
return ConstantFoldInstOperands(I->getOpcode(), I->getType(),
&Operands[0], Operands.size());
}
/// getConstantEvolutionLoopExitValue - If we know that the specified Phi is
@ -2213,7 +2218,14 @@ SCEVHandle ScalarEvolutionsImpl::getSCEVAtScope(SCEV *V, const Loop *L) {
}
}
}
Constant *C =ConstantFoldInstOperands(I, &Operands[0], Operands.size());
Constant *C;
if (const CmpInst *CI = dyn_cast<CmpInst>(I))
C = ConstantFoldCompareInstOperands(CI->getPredicate(),
&Operands[0], Operands.size());
else
C = ConstantFoldInstOperands(I->getOpcode(), I->getType(),
&Operands[0], Operands.size());
return SE.getUnknown(C);
}
}