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[InstCombine] add test to show missed vector fold; NFC 

llvm-svn: 292035
This commit is contained in:
Sanjay Patel 2017-01-14 23:12:29 +00:00
parent 70110ec582
commit f8ed0a5e93
1 changed files with 13 additions and 0 deletions
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13
llvm/test/Transforms/InstCombine/signext.ll
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@ -72,6 +72,19 @@ define i32 @test6(i16 %P) {
ret i32 %tmp.5
}
define <2 x i32> @test6_splat_vec(<2 x i12> %P) {
; CHECK-LABEL: @test6_splat_vec(
; CHECK-NEXT: [[Z:%.*]] = zext <2 x i12> %P to <2 x i32>
; CHECK-NEXT: [[SHL:%.*]] = shl nuw <2 x i32> [[Z]], <i32 20, i32 20>
; CHECK-NEXT: [[ASHR:%.*]] = ashr <2 x i32> [[SHL]], <i32 20, i32 20>
; CHECK-NEXT: ret <2 x i32> [[ASHR]]
;
%z = zext <2 x i12> %P to <2 x i32>
%shl = shl <2 x i32> %z, <i32 20, i32 20>
%ashr = ashr <2 x i32> %shl, <i32 20, i32 20>
ret <2 x i32> %ashr
}
define i32 @test7(i32 %x) {
; CHECK-LABEL: @test7(
; CHECK-NEXT: [[SUB:%.*]] = ashr i32 %x, 5