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Revert "[InstCombine] Don't miscompile safe increment idiom"
This is breaking a lot of build bots and is causing very long-running compiles (infinite loops)? Likely, we shouldn't return nullptr? git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239139 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -292,28 +292,10 @@ static Value *SimplifyWithOpReplaced(Value *V, Value *Op, Value *RepOp,
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// If this is a binary operator, try to simplify it with the replaced op.
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if (BinaryOperator *B = dyn_cast<BinaryOperator>(I)) {
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Value *Simplified = nullptr;
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if (B->getOperand(0) == Op)
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Simplified =
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SimplifyBinOp(B->getOpcode(), RepOp, B->getOperand(1), DL, TLI);
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if (!Simplified && B->getOperand(1) == Op)
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Simplified =
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SimplifyBinOp(B->getOpcode(), B->getOperand(0), RepOp, DL, TLI);
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if (Simplified) {
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// Consider:
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// %cmp = icmp eq i32 %x, 2147483647
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// %add = add nsw i32 %x, 1
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// %sel = select i1 %cmp, i32 -2147483648, i32 %add
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//
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// We can't replace %sel with %add unless we strip away the flags.
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if (isa<OverflowingBinaryOperator>(B)) {
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B->setHasNoSignedWrap(false);
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B->setHasNoUnsignedWrap(false);
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}
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if (isa<PossiblyExactOperator>(B))
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B->setIsExact(false);
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}
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return Simplified;
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return SimplifyBinOp(B->getOpcode(), RepOp, B->getOperand(1), DL, TLI);
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if (B->getOperand(1) == Op)
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return SimplifyBinOp(B->getOpcode(), B->getOperand(0), RepOp, DL, TLI);
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}
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// Same for CmpInsts.
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@ -1532,13 +1532,3 @@ define i32 @test_max_of_min(i32 %a) {
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%s1 = select i1 %c1, i32 %s0, i32 -1
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ret i32 %s1
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}
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define i32 @PR23757(i32 %x) {
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; CHECK-LABEL: @PR23757
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; CHECK: %[[add:.*]] = add i32 %x, 1
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; CHECK-NEXT: ret i32 %[[add]]
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%cmp = icmp eq i32 %x, 2147483647
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%add = add nsw i32 %x, 1
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%sel = select i1 %cmp, i32 -2147483648, i32 %add
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ret i32 %sel
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}
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