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Add a couple of extra test noticed in post-commit discussion of rL369541 

llvm-svn: 369546
This commit is contained in:
Philip Reames 2019-08-21 16:57:53 +00:00
parent 717feabdf0
commit 3c4614ff10
1 changed files with 19 additions and 0 deletions
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19
llvm/test/Transforms/InstCombine/icmp-sub.ll
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@ -124,3 +124,22 @@ define i1 @test_sub_127_Y_eq_127(i8 %y) {
%z = icmp eq i8 %s, 127 %z = icmp eq i8 %s, 127
ret i1 %z ret i1 %z
} }
define i1 @test_sub_255_Y_eq_255(i8 %y) {
; CHECK-LABEL: @test_sub_255_Y_eq_255(
; CHECK-NEXT: [[Z:%.*]] = icmp eq i8 [[Y:%.*]], 0
; CHECK-NEXT: ret i1 [[Z]]
;
%s = sub i8 255, %y
%z = icmp eq i8 %s, 255
ret i1 %z
}
define <2 x i1> @test_sub_255_Y_eq_255_vec(<2 x i8> %y) {
; CHECK-LABEL: @test_sub_255_Y_eq_255_vec(
; CHECK-NEXT: [[Z:%.*]] = icmp eq <2 x i8> [[Y:%.*]], zeroinitializer
; CHECK-NEXT: ret <2 x i1> [[Z]]
;
%s = sub <2 x i8> <i8 255, i8 255>, %y
%z = icmp eq <2 x i8> %s, <i8 255, i8 255>
ret <2 x i1> %z
}