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def_mask
2017 Mar 30
2
InstructionSimplify: adding a hook for shufflevector instructions
...streaming patches. I assume that this is not related to our conservative approach of refraining from creation of new shuffle masks that may hurt some target.
Here are some more opportunities that can be added to InstructionSimplify, all of which are covered by InstCombine:
define <4 x i32> @undef_mask(<4 x i32> %x) {
%shuf = shufflevector <4 x i32> %x, <4 x i32> undef, <4 x i32> undef
ret <4 x i32> %shuf
}
-->
define <4 x i32> @undef_mask(<4 x i32> %x) {
ret <4 x i32> undef
}
define <4 x i32> @identity_mask_0(<4 x i32> %x) {...