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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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8
lib/Transforms/Utils/CloneFunction.cpp
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@ -299,7 +299,13 @@ ConstantFoldMappedInstruction(const Instruction *I) {
else
return 0; // All operands not constant!
return ConstantFoldInstOperands(I, &Ops[0], Ops.size(), TD);
if (const CmpInst *CI = dyn_cast<CmpInst>(I))
return ConstantFoldCompareInstOperands(CI->getPredicate(),
&Ops[0], Ops.size(), TD);
else
return ConstantFoldInstOperands(I->getOpcode(), I->getType(),
&Ops[0], Ops.size(), TD);
}
/// CloneAndPruneFunctionInto - This works exactly like CloneFunctionInto,