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Add back FoldOpIntoPhi optimizations with fix. Included test cases to help catch these errors and to test the presence of the optimization itself
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170248 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -354,6 +354,10 @@ Instruction *InstCombiner::visitFAdd(BinaryOperator &I) {
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if (Value *V = SimplifyFAddInst(LHS, RHS, I.getFastMathFlags(), TD))
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return ReplaceInstUsesWith(I, V);
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if (isa<Constant>(RHS) && isa<PHINode>(LHS))
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if (Instruction *NV = FoldOpIntoPhi(I))
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return NV;
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// -A + B --> B - A
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// -A + -B --> -(A + B)
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if (Value *LHSV = dyn_castFNegVal(LHS))
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39
test/Transforms/InstCombine/fold-phi.ll
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39
test/Transforms/InstCombine/fold-phi.ll
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@ -0,0 +1,39 @@
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; RUN: opt < %s -instcombine -S | FileCheck %s
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; CHECK: no_crash
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define float @no_crash(float %a) nounwind {
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entry:
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br label %for.body
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for.body:
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%sum.057 = phi float [ 0.000000e+00, %entry ], [ %add5, %bb0 ]
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%add5 = fadd float %sum.057, %a ; PR14592
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br i1 undef, label %bb0, label %end
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bb0:
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br label %for.body
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end:
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ret float %add5
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}
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; CHECK: fold_phi
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define float @fold_phi(float %a) nounwind {
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entry:
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br label %for.body
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for.body:
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; CHECK: phi float
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; CHECK-NEXT: br i1 undef
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%sum.057 = phi float [ 0.000000e+00, %entry ], [ %add5, %bb0 ]
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%add5 = fadd float %sum.057, 1.0 ;; Should be moved to the latch!
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br i1 undef, label %bb0, label %end
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; CHECK: bb0:
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bb0:
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; CHECK: fadd float
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br label %for.body
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end:
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ret float %add5
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}
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