[llvm] r340933 - [InstCombine] add test for vector demanded elements + shrinking; NFC
Sanjay Patel via llvm-commits
llvm-commits at lists.llvm.org
Wed Aug 29 08:34:19 PDT 2018
Author: spatel
Date: Wed Aug 29 08:34:19 2018
New Revision: 340933
URL: http://llvm.org/viewvc/llvm-project?rev=340933&view=rev
Log:
[InstCombine] add test for vector demanded elements + shrinking; NFC
Modified:
llvm/trunk/test/Transforms/InstCombine/shuffle-select-narrow.ll
Modified: llvm/trunk/test/Transforms/InstCombine/shuffle-select-narrow.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/shuffle-select-narrow.ll?rev=340933&r1=340932&r2=340933&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/shuffle-select-narrow.ll (original)
+++ llvm/trunk/test/Transforms/InstCombine/shuffle-select-narrow.ll Wed Aug 29 08:34:19 2018
@@ -16,6 +16,21 @@ define <2 x i8> @narrow_shuffle_of_selec
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) {
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