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[InstCombine] add test for vector demanded elements + shrinking; NFC

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llvm-svn: 340933
This commit is contained in:
Sanjay Patel 2018-08-29 15:34:19 +00:00
parent d5effbea90
commit 4f40c047fe
1 changed files with 15 additions and 0 deletions
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15
test/Transforms/InstCombine/shuffle-select-narrow.ll
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@ -16,6 +16,21 @@ define <2 x i8> @narrow_shuffle_of_select(<2 x i1> %cmp, <4 x i8> %x, <4 x i8> %
ret <2 x i8> %r
}
; TODO: The 1st shuffle is not extending with undefs, but demanded elements should correct that.
define <2 x i8> @narrow_shuffle_of_select_overspecified_extend(<2 x i1> %cmp, <4 x i8> %x, <4 x i8> %y) {
; CHECK-LABEL: @narrow_shuffle_of_select_overspecified_extend(
; CHECK-NEXT: [[WIDECMP:%.*]] = shufflevector <2 x i1> [[CMP:%.*]], <2 x i1> undef, <4 x i32> <i32 0, i32 1, i32 0, i32 1>
; CHECK-NEXT: [[WIDESEL:%.*]] = select <4 x i1> [[WIDECMP]], <4 x i8> [[X:%.*]], <4 x i8> [[Y:%.*]]
; CHECK-NEXT: [[R:%.*]] = shufflevector <4 x i8> [[WIDESEL]], <4 x i8> undef, <2 x i32> <i32 0, i32 1>
; CHECK-NEXT: ret <2 x i8> [[R]]
;
%widecmp = shufflevector <2 x i1> %cmp, <2 x i1> undef, <4 x i32> <i32 0, i32 1, i32 0, i32 1>
%widesel = select <4 x i1> %widecmp, <4 x i8> %x, <4 x i8> %y
%r = shufflevector <4 x i8> %widesel, <4 x i8> undef, <2 x i32> <i32 0, i32 1>
ret <2 x i8> %r
}
; TODO: Verify that undef elements are acceptable for identity shuffle mask. Also check FP types.
define <3 x float> @narrow_shuffle_of_select_undefs(<3 x i1> %cmp, <4 x float> %x, <4 x float> %y) {