InstCombine: Fold more shuffles of shuffles.

[oota-llvm.git] / test / Transforms / InstCombine / vec_shuffle.ll

diff --git a/test/Transforms/InstCombine/vec_shuffle.ll b/test/Transforms/InstCombine/vec_shuffle.ll
index 37d4d56e9131291bb847aec217f9c1b4db10530f..37c19f1558b930e5528e598eb12d312c3e5675bd 100644 (file)
--- a/test/Transforms/InstCombine/vec_shuffle.ll
+++ b/test/Transforms/InstCombine/vec_shuffle.ll
@@ -86,14 +86,14 @@ define <4 x i8> @test9(<16 x i8> %tmp6) nounwind {
 }
 
 ; Same as test9, but make sure that "undef" mask values are not confused with
-; mask values of 2*N, where N is the mask length.  These shuffles should not
-; be folded (because [8,9,4,8] may not be a mask supported by the target).
-define <4 x i8> @test9a(<16 x i8> %tmp6) nounwind {
+; mask values of 2*N, where N is the mask length of the result.  Make sure when
+; folding these shuffles that 'undef' mask values stay that way in the result
+; instead of getting mapped to the 2*N'th entry of the source.
+define <4 x i8> @test9a(<16 x i8> %in, <16 x i8> %in2) nounwind {
 ; CHECK: @test9a
-; CHECK-NEXT: shufflevector
-; CHECK-NEXT: shufflevector
+; CHECK-NEXT: shufflevector <16 x i8> %in, <16 x i8> %in2, <4 x i32> <i32 16, i32 9, i32 4, i32 undef>
 ; CHECK-NEXT: ret
-       %tmp7 = shufflevector <16 x i8> %tmp6, <16 x i8> undef, <4 x i32> < i32 undef, i32 9, i32 4, i32 8 >            ; <<4 x i8>> [#uses=1]
+       %tmp7 = shufflevector <16 x i8> %in, <16 x i8> %in2, <4 x i32> < i32 undef, i32 9, i32 4, i32 16 >              ; <<4 x i8>> [#uses=1]
        %tmp9 = shufflevector <4 x i8> %tmp7, <4 x i8> undef, <4 x i32> < i32 3, i32 1, i32 2, i32 0 >          ; <<4 x i8>> [#uses=1]
        ret <4 x i8> %tmp9
 }