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Bad SLPVectorization shufflevector replacement, resulting in write to…
… wrong memory location We see that it might otherwise do: %10 = getelementptr {}**, <2 x {}***> %9, <2 x i32> <i32 10, i32 4> %11 = bitcast <2 x {}***> %10 to <2 x i64*> ... %27 = extractelement <2 x i64*> %11, i32 0 %28 = bitcast i64* %27 to <2 x i64>* store <2 x i64> %22, <2 x i64>* %28, align 4, !tbaa !2 Which is an out-of-bounds store (the extractelement got offset 10 instead of offset 4 as intended). With the fix, we correctly generate extractelement for i32 1 and generate correct code. Differential Revision: https://reviews.llvm.org/D106613 (cherry picked from commit 980d2f6)
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