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[InstCombine] add test for vectors with undef elts; NFC

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llvm-svn: 326661
This commit is contained in:
Sanjay Patel 2018-03-03 18:00:15 +00:00
parent 9968c706bd
commit 951a173e2d
1 changed files with 14 additions and 1 deletions
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15
test/Transforms/InstCombine/sub.ll
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@ -40,7 +40,6 @@ define i32 @test4(i32 %A, i32 %x) {
ret i32 %C
}
; FIXME:
; (~X) - (~Y) --> Y - X
; Also, show that we can handle extra uses and vectors.
@ -74,6 +73,20 @@ define <2 x i8> @notnotsub_vec(<2 x i8> %x, <2 x i8> %y) {
ret <2 x i8> %sub
}
; FIXME:
define <2 x i8> @notnotsub_vec_undef_elts(<2 x i8> %x, <2 x i8> %y) {
; CHECK-LABEL: @notnotsub_vec_undef_elts(
; CHECK-NEXT: [[NX:%.*]] = xor <2 x i8> [[X:%.*]], <i8 undef, i8 -1>
; CHECK-NEXT: [[NY:%.*]] = xor <2 x i8> [[Y:%.*]], <i8 -1, i8 undef>
; CHECK-NEXT: [[SUB:%.*]] = sub <2 x i8> [[NX]], [[NY]]
; CHECK-NEXT: ret <2 x i8> [[SUB]]
;
%nx = xor <2 x i8> %x, <i8 undef, i8 -1>
%ny = xor <2 x i8> %y, <i8 -1, i8 undef>
%sub = sub <2 x i8> %nx, %ny
ret <2 x i8> %sub
}
define i32 @test5(i32 %A, i32 %B, i32 %C) {
; CHECK-LABEL: @test5(
; CHECK-NEXT: [[D1:%.*]] = sub i32 [[C:%.*]], [[B:%.*]]