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[InstCombine] add tests for sdiv-by-int-min; NFC 

llvm-svn: 358008
This commit is contained in:
Sanjay Patel 2019-04-09 14:27:07 +00:00
parent d469954d61
commit 7563b65ad4
1 changed files with 30 additions and 0 deletions
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30
llvm/test/Transforms/InstCombine/div.ll
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@ -929,3 +929,33 @@ define i8 @test_exact_div_minSigned(i8 %x) {
%neg = sub nsw i8 0, %div
ret i8 %neg
}
; X / INT_MIN --> X == INT_MIN
define i8 @sdiv_by_int_min(i8 %x) {
; CHECK-LABEL: @sdiv_by_int_min(
; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i8 [[X:%.*]], -128
; CHECK-NEXT: [[D:%.*]] = zext i1 [[TMP1]] to i8
; CHECK-NEXT: ret i8 [[D]]
;
%d = sdiv i8 %x, -128
ret i8 %d
}
define <2 x i8> @sdiv_by_int_min_vec_splat(<2 x i8> %x) {
; CHECK-LABEL: @sdiv_by_int_min_vec_splat(
; CHECK-NEXT: [[TMP1:%.*]] = icmp eq <2 x i8> [[X:%.*]], <i8 -128, i8 -128>
; CHECK-NEXT: [[D:%.*]] = zext <2 x i1> [[TMP1]] to <2 x i8>
; CHECK-NEXT: ret <2 x i8> [[D]]
;
%d = sdiv <2 x i8> %x, <i8 -128, i8 -128>
ret <2 x i8> %d
}
define <2 x i8> @sdiv_by_int_min_vec_splat_undef(<2 x i8> %x) {
; CHECK-LABEL: @sdiv_by_int_min_vec_splat_undef(
; CHECK-NEXT: ret <2 x i8> undef
;
%d = sdiv <2 x i8> %x, <i8 -128, i8 undef>
ret <2 x i8> %d
}