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ConstantFold: Check that truncating the other side is safe under a sext when trying to remove a sext from a compare.
Fixes PR16462. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185284 91177308-0d34-0410-b5e6-96231b3b80d8
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@@ -1857,9 +1857,9 @@ Constant *llvm::ConstantFoldCompareInstruction(unsigned short pred,
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if (CE1Inverse == CE1Op0) {
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// Check whether we can safely truncate the right hand side.
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Constant *C2Inverse = ConstantExpr::getTrunc(C2, CE1Op0->getType());
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if (ConstantExpr::getZExt(C2Inverse, C2->getType()) == C2) {
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if (ConstantExpr::getCast(CE1->getOpcode(), C2Inverse,
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C2->getType()) == C2)
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return ConstantExpr::getICmp(pred, CE1Inverse, C2Inverse);
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}
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}
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}
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}
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