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[InstCombine] add test for vector widening of insertelements; NFC

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The test shows a potential overreach with the fix from D52548.

llvm-svn: 343378
This commit is contained in:
Sanjay Patel 2018-09-29 15:01:45 +00:00
parent 20b5e7e0c4
commit 141720c73b
1 changed files with 15 additions and 0 deletions
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15
test/Transforms/InstCombine/vec_shuffle.ll
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@ -218,6 +218,21 @@ define <3 x i32> @div_wider(i32 %y, i32 %z) {
ret <3 x i32> %ext ret <3 x i32> %ext
} }
; TODO: Increasing length of insertelements (no math ops) is a good canonicalization.
define <3 x i8> @fold_inselts_with_widening_shuffle(i8 %x, i8 %y) {
; CHECK-LABEL: @fold_inselts_with_widening_shuffle(
; CHECK-NEXT: [[INS0:%.*]] = insertelement <2 x i8> undef, i8 [[X:%.*]], i32 0
; CHECK-NEXT: [[INS1:%.*]] = insertelement <2 x i8> [[INS0]], i8 [[Y:%.*]], i32 1
; CHECK-NEXT: [[WIDEN:%.*]] = shufflevector <2 x i8> [[INS1]], <2 x i8> undef, <3 x i32> <i32 0, i32 1, i32 undef>
; CHECK-NEXT: ret <3 x i8> [[WIDEN]]
;
%ins0 = insertelement <2 x i8> undef, i8 %x, i32 0
%ins1 = insertelement <2 x i8> %ins0, i8 %y, i32 1
%widen = shufflevector <2 x i8> %ins1, <2 x i8> undef, <3 x i32> <i32 0, i32 1, i32 undef>
ret <3 x i8> %widen
}
define <2 x i8> @test13b(i8 %x) { define <2 x i8> @test13b(i8 %x) {
; CHECK-LABEL: @test13b( ; CHECK-LABEL: @test13b(
; CHECK-NEXT: [[TMP1:%.*]] = insertelement <2 x i8> undef, i8 [[X:%.*]], i32 1 ; CHECK-NEXT: [[TMP1:%.*]] = insertelement <2 x i8> undef, i8 [[X:%.*]], i32 1