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2019 Dec 09
2
[PATCH] D70246: [InstCombine] remove identity shuffle simplification for mask with undefs
Sanjay,
I'm looking at some missed optimizations caused by D70246. Here's a test case:
define <4 x float> @f(i32 %t32, <4 x float>* %t24) {
.entry:
%t43 = insertelement <3 x i32> undef, i32 %t32, i32 2
%t44 = bitcast <3 x i32> %t43 to <3 x float>
%t45 = shufflevector <3 x float> %t44, <3 x float> undef, <4 x i32>
<i32 0, i32 undef,