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[InstCombine] Add pre-commit tests. NFC.
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‎llvm/test/Transforms/InstCombine/icmp-select.ll

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@@ -628,3 +628,141 @@ define i1 @icmp_slt_select(i1 %cond, i32 %a, i32 %b) {
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%res = icmp slt i32 %lhs, %rhs
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ret i1 %res
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}
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define i1 @discr_eq(i8 %a, i8 %b) {
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; CHECK-LABEL: @discr_eq(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[ADD1:%.*]] = add i8 [[A:%.*]], -2
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; CHECK-NEXT: [[CMP1:%.*]] = icmp ugt i8 [[A]], 1
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; CHECK-NEXT: [[SEL1:%.*]] = select i1 [[CMP1]], i8 [[ADD1]], i8 1
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; CHECK-NEXT: [[ADD2:%.*]] = add i8 [[B:%.*]], -2
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; CHECK-NEXT: [[CMP2:%.*]] = icmp ugt i8 [[B]], 1
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; CHECK-NEXT: [[SEL2:%.*]] = select i1 [[CMP2]], i8 [[ADD2]], i8 1
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; CHECK-NEXT: [[RES:%.*]] = icmp eq i8 [[SEL1]], [[SEL2]]
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; CHECK-NEXT: ret i1 [[RES]]
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;
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entry:
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%add1 = add i8 %a, -2
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%cmp1 = icmp ugt i8 %a, 1
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%sel1 = select i1 %cmp1, i8 %add1, i8 1
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%add2 = add i8 %b, -2
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%cmp2 = icmp ugt i8 %b, 1
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%sel2 = select i1 %cmp2, i8 %add2, i8 1
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%res = icmp eq i8 %sel1, %sel2
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ret i1 %res
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}
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define i1 @discr_ne(i8 %a, i8 %b) {
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; CHECK-LABEL: @discr_ne(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[ADD1:%.*]] = add i8 [[A:%.*]], -2
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; CHECK-NEXT: [[CMP1:%.*]] = icmp ugt i8 [[A]], 1
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; CHECK-NEXT: [[SEL1:%.*]] = select i1 [[CMP1]], i8 [[ADD1]], i8 1
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; CHECK-NEXT: [[ADD2:%.*]] = add i8 [[B:%.*]], -2
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; CHECK-NEXT: [[CMP2:%.*]] = icmp ugt i8 [[B]], 1
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; CHECK-NEXT: [[SEL2:%.*]] = select i1 [[CMP2]], i8 [[ADD2]], i8 1
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; CHECK-NEXT: [[RES:%.*]] = icmp ne i8 [[SEL1]], [[SEL2]]
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; CHECK-NEXT: ret i1 [[RES]]
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;
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entry:
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%add1 = add i8 %a, -2
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%cmp1 = icmp ugt i8 %a, 1
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%sel1 = select i1 %cmp1, i8 %add1, i8 1
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%add2 = add i8 %b, -2
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%cmp2 = icmp ugt i8 %b, 1
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%sel2 = select i1 %cmp2, i8 %add2, i8 1
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%res = icmp ne i8 %sel1, %sel2
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ret i1 %res
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}
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define i1 @discr_xor_eq(i8 %a, i8 %b) {
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; CHECK-LABEL: @discr_xor_eq(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[XOR1:%.*]] = xor i8 [[A:%.*]], -3
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; CHECK-NEXT: [[CMP1:%.*]] = icmp ugt i8 [[A]], 1
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; CHECK-NEXT: [[TMP0:%.*]] = select i1 [[CMP1]], i8 [[XOR1]], i8 1
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; CHECK-NEXT: [[XOR2:%.*]] = xor i8 [[B:%.*]], -3
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; CHECK-NEXT: [[CMP2:%.*]] = icmp ugt i8 [[B]], 1
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; CHECK-NEXT: [[TMP1:%.*]] = select i1 [[CMP2]], i8 [[XOR2]], i8 1
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; CHECK-NEXT: [[RES:%.*]] = icmp eq i8 [[TMP0]], [[TMP1]]
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; CHECK-NEXT: ret i1 [[RES]]
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;
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entry:
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%xor1 = xor i8 %a, -3
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%cmp1 = icmp ugt i8 %a, 1
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%sel1 = select i1 %cmp1, i8 %xor1, i8 1
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%xor2 = xor i8 %b, -3
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%cmp2 = icmp ugt i8 %b, 1
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%sel2 = select i1 %cmp2, i8 %xor2, i8 1
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%res = icmp eq i8 %sel1, %sel2
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ret i1 %res
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}
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define i1 @discr_eq_simple(i8 %a, i8 %b) {
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; CHECK-LABEL: @discr_eq_simple(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[ADD1:%.*]] = add i8 [[A:%.*]], -2
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; CHECK-NEXT: [[CMP1:%.*]] = icmp ugt i8 [[A]], 1
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; CHECK-NEXT: [[SEL1:%.*]] = select i1 [[CMP1]], i8 [[ADD1]], i8 1
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; CHECK-NEXT: [[ADD2:%.*]] = add i8 [[B:%.*]], -2
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; CHECK-NEXT: [[RES:%.*]] = icmp eq i8 [[SEL1]], [[ADD2]]
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; CHECK-NEXT: ret i1 [[RES]]
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;
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entry:
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%add1 = add i8 %a, -2
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%cmp1 = icmp ugt i8 %a, 1
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%sel1 = select i1 %cmp1, i8 %add1, i8 1
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%add2 = add i8 %b, -2
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%res = icmp eq i8 %sel1, %add2
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ret i1 %res
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}
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; Negative tests
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define i1 @discr_eq_multi_use(i8 %a, i8 %b) {
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; CHECK-LABEL: @discr_eq_multi_use(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[ADD1:%.*]] = add i8 [[A:%.*]], -2
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; CHECK-NEXT: [[CMP1:%.*]] = icmp ugt i8 [[A]], 1
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; CHECK-NEXT: [[SEL1:%.*]] = select i1 [[CMP1]], i8 [[ADD1]], i8 1
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; CHECK-NEXT: call void @use(i8 [[SEL1]])
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; CHECK-NEXT: [[ADD2:%.*]] = add i8 [[B:%.*]], -2
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; CHECK-NEXT: [[CMP2:%.*]] = icmp ugt i8 [[B]], 1
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; CHECK-NEXT: [[SEL2:%.*]] = select i1 [[CMP2]], i8 [[ADD2]], i8 1
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; CHECK-NEXT: [[RES:%.*]] = icmp eq i8 [[SEL1]], [[SEL2]]
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; CHECK-NEXT: ret i1 [[RES]]
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;
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entry:
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%add1 = add i8 %a, -2
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%cmp1 = icmp ugt i8 %a, 1
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%sel1 = select i1 %cmp1, i8 %add1, i8 1
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call void @use(i8 %sel1)
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%add2 = add i8 %b, -2
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%cmp2 = icmp ugt i8 %b, 1
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%sel2 = select i1 %cmp2, i8 %add2, i8 1
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%res = icmp eq i8 %sel1, %sel2
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ret i1 %res
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}
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define i1 @discr_eq_failed_to_simplify(i8 %a, i8 %b) {
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; CHECK-LABEL: @discr_eq_failed_to_simplify(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[ADD1:%.*]] = add i8 [[A:%.*]], -3
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; CHECK-NEXT: [[CMP1:%.*]] = icmp ugt i8 [[A]], 1
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; CHECK-NEXT: [[SEL1:%.*]] = select i1 [[CMP1]], i8 [[ADD1]], i8 1
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; CHECK-NEXT: [[ADD2:%.*]] = add i8 [[B:%.*]], -2
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; CHECK-NEXT: [[CMP2:%.*]] = icmp ugt i8 [[B]], 1
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; CHECK-NEXT: [[SEL2:%.*]] = select i1 [[CMP2]], i8 [[ADD2]], i8 1
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; CHECK-NEXT: [[RES:%.*]] = icmp eq i8 [[SEL1]], [[SEL2]]
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; CHECK-NEXT: ret i1 [[RES]]
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;
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entry:
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%add1 = add i8 %a, -3
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%cmp1 = icmp ugt i8 %a, 1
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%sel1 = select i1 %cmp1, i8 %add1, i8 1
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%add2 = add i8 %b, -2
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%cmp2 = icmp ugt i8 %b, 1
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%sel2 = select i1 %cmp2, i8 %add2, i8 1
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%res = icmp eq i8 %sel1, %sel2
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ret i1 %res
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}

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