Index: llvm/trunk/lib/Transforms/Vectorize/SLPVectorizer.cpp =================================================================== --- llvm/trunk/lib/Transforms/Vectorize/SLPVectorizer.cpp +++ llvm/trunk/lib/Transforms/Vectorize/SLPVectorizer.cpp @@ -2493,10 +2493,6 @@ Value *LHS = vectorizeTree(LHSVL); Value *RHS = vectorizeTree(RHSVL); - if (LHS == RHS && isa(LHS)) { - assert((VL0->getOperand(0) == VL0->getOperand(1)) && "Invalid order"); - } - if (Value *V = alreadyVectorized(E->Scalars)) return V; Index: llvm/trunk/test/Transforms/SLPVectorizer/X86/pr31599.ll =================================================================== --- llvm/trunk/test/Transforms/SLPVectorizer/X86/pr31599.ll +++ llvm/trunk/test/Transforms/SLPVectorizer/X86/pr31599.ll @@ -0,0 +1,30 @@ +; NOTE: Assertions have been autogenerated by utils/update_test_checks.py +; RUN: opt -slp-vectorizer -S -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s + +define <2 x float> @foo() { +; CHECK-LABEL: @foo( +; CHECK-NEXT: entry: +; CHECK-NEXT: [[SOURCE:%.*]] = insertelement <2 x float> undef, float undef, i32 0 +; CHECK-NEXT: [[TMP0:%.*]] = fsub <2 x float> [[SOURCE]], [[SOURCE]] +; CHECK-NEXT: [[TMP1:%.*]] = extractelement <2 x float> [[TMP0]], i32 0 +; CHECK-NEXT: [[RES1:%.*]] = insertelement <2 x float> undef, float [[TMP1]], i32 0 +; CHECK-NEXT: [[TMP2:%.*]] = extractelement <2 x float> [[TMP0]], i32 1 +; CHECK-NEXT: [[RES2:%.*]] = insertelement <2 x float> [[RES1]], float [[TMP2]], i32 1 +; CHECK-NEXT: ret <2 x float> [[RES2]] +; +entry: + %source = insertelement <2 x float> undef, float undef, i32 0 + %e0 = extractelement <2 x float> %source, i32 0 + %e0.dup = extractelement <2 x float> %source, i32 0 + %sub1 = fsub float %e0, %e0.dup + %e1 = extractelement <2 x float> %source, i32 1 + %e1.dup = extractelement <2 x float> %source, i32 1 + %sub2 = fsub float %e1, %e1.dup + %res1 = insertelement <2 x float> undef, float %sub1, i32 0 + %res2 = insertelement <2 x float> %res1, float %sub2, i32 1 + ret <2 x float> %res2 +} + +!llvm.ident = !{!0, !0} + +!0 = !{!"clang version 4.0.0 "}