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Revert "Add the nsw flag when we detect that an add will not signed overflow."

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This reverts commit r210029.

It was not correctly handling cases where LHS and RHS had multiple but different
sign bits.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210048 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2014-06-02 21:12:19 +00:00
parent 8962f1959d
commit 2e1c072976
7 changed files with 12 additions and 17 deletions
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5
lib/Transforms/InstCombine/InstCombineAddSub.cpp
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@ -1191,11 +1191,6 @@ Instruction *InstCombiner::visitAdd(BinaryOperator &I) {
return BinaryOperator::CreateOr(A, B);
}
if (!I.hasNoSignedWrap() && WillNotOverflowSignedAdd(LHS, RHS)) {
Changed = true;
I.setHasNoSignedWrap(true);
}
return Changed ? &I : nullptr;
}