derek.holloway
7502bf64a4
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185 lines
5.6 KiB
LLVM
185 lines
5.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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; sext(A s< B) + zext(A s> B) => scmp(A, B)
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define i8 @signed_add(i32 %a, i32 %b) {
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; CHECK-LABEL: define i8 @signed_add(
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; CHECK-SAME: i32 [[A:%.*]], i32 [[B:%.*]]) {
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; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.scmp.i8.i32(i32 [[A]], i32 [[B]])
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; CHECK-NEXT: ret i8 [[R]]
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;
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%lt = icmp slt i32 %a, %b
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%lt8 = sext i1 %lt to i8
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%gt = icmp sgt i32 %a, %b
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%gt8 = zext i1 %gt to i8
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%r = add i8 %lt8, %gt8
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ret i8 %r
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}
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; Unsigned version
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define i8 @unsigned_add(i32 %a, i32 %b) {
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; CHECK-LABEL: define i8 @unsigned_add(
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; CHECK-SAME: i32 [[A:%.*]], i32 [[B:%.*]]) {
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; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.ucmp.i8.i32(i32 [[A]], i32 [[B]])
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; CHECK-NEXT: ret i8 [[R]]
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;
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%lt = icmp ult i32 %a, %b
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%lt8 = sext i1 %lt to i8
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%gt = icmp ugt i32 %a, %b
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%gt8 = zext i1 %gt to i8
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%r = add i8 %lt8, %gt8
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ret i8 %r
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}
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; Commuted operands
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define i8 @signed_add_commuted1(i32 %a, i32 %b) {
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; CHECK-LABEL: define i8 @signed_add_commuted1(
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; CHECK-SAME: i32 [[A:%.*]], i32 [[B:%.*]]) {
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; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.scmp.i8.i32(i32 [[B]], i32 [[A]])
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; CHECK-NEXT: ret i8 [[R]]
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;
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%lt = icmp slt i32 %a, %b
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%lt8 = zext i1 %lt to i8
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%gt = icmp sgt i32 %a, %b
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%gt8 = sext i1 %gt to i8
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%r = add i8 %lt8, %gt8
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ret i8 %r
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}
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define i8 @signed_add_commuted2(i32 %a, i32 %b) {
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; CHECK-LABEL: define i8 @signed_add_commuted2(
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; CHECK-SAME: i32 [[A:%.*]], i32 [[B:%.*]]) {
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; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.scmp.i8.i32(i32 [[A]], i32 [[B]])
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; CHECK-NEXT: ret i8 [[R]]
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;
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%lt = icmp sgt i32 %b, %a
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%lt8 = sext i1 %lt to i8
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%gt = icmp sgt i32 %a, %b
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%gt8 = zext i1 %gt to i8
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%r = add i8 %lt8, %gt8
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ret i8 %r
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}
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; zext(A s> B) - zext(A s< B) => scmp(A, B)
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define i8 @signed_sub(i32 %a, i32 %b) {
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; CHECK-LABEL: define i8 @signed_sub(
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; CHECK-SAME: i32 [[A:%.*]], i32 [[B:%.*]]) {
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; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.scmp.i8.i32(i32 [[A]], i32 [[B]])
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; CHECK-NEXT: ret i8 [[R]]
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;
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%lt = icmp slt i32 %a, %b
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%lt8 = zext i1 %lt to i8
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%gt = icmp sgt i32 %a, %b
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%gt8 = zext i1 %gt to i8
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%r = sub i8 %gt8, %lt8
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ret i8 %r
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}
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; Unsigned version
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define i8 @unsigned_sub(i32 %a, i32 %b) {
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; CHECK-LABEL: define i8 @unsigned_sub(
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; CHECK-SAME: i32 [[A:%.*]], i32 [[B:%.*]]) {
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; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.ucmp.i8.i32(i32 [[A]], i32 [[B]])
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; CHECK-NEXT: ret i8 [[R]]
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;
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%lt = icmp ult i32 %a, %b
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%lt8 = zext i1 %lt to i8
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%gt = icmp ugt i32 %a, %b
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%gt8 = zext i1 %gt to i8
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%r = sub i8 %gt8, %lt8
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ret i8 %r
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}
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; Negative test: incorrect predicates
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define i8 @signed_add_neg1(i32 %a, i32 %b) {
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; CHECK-LABEL: define i8 @signed_add_neg1(
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; CHECK-SAME: i32 [[A:%.*]], i32 [[B:%.*]]) {
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; CHECK-NEXT: [[LT:%.*]] = icmp sgt i32 [[A]], [[B]]
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; CHECK-NEXT: [[LT8:%.*]] = sext i1 [[LT]] to i8
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; CHECK-NEXT: [[GT:%.*]] = icmp sgt i32 [[A]], [[B]]
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; CHECK-NEXT: [[GT8:%.*]] = zext i1 [[GT]] to i8
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; CHECK-NEXT: [[R:%.*]] = add nsw i8 [[LT8]], [[GT8]]
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; CHECK-NEXT: ret i8 [[R]]
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;
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%lt = icmp sgt i32 %a, %b
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%lt8 = sext i1 %lt to i8
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%gt = icmp sgt i32 %a, %b
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%gt8 = zext i1 %gt to i8
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%r = add i8 %lt8, %gt8
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ret i8 %r
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}
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define i8 @signed_add_neg2(i32 %a, i32 %b) {
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; CHECK-LABEL: define i8 @signed_add_neg2(
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; CHECK-SAME: i32 [[A:%.*]], i32 [[B:%.*]]) {
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; CHECK-NEXT: [[LT:%.*]] = icmp slt i32 [[A]], [[B]]
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; CHECK-NEXT: [[LT8:%.*]] = sext i1 [[LT]] to i8
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; CHECK-NEXT: [[GT:%.*]] = icmp ne i32 [[A]], [[B]]
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; CHECK-NEXT: [[GT8:%.*]] = zext i1 [[GT]] to i8
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; CHECK-NEXT: [[R:%.*]] = add nsw i8 [[LT8]], [[GT8]]
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; CHECK-NEXT: ret i8 [[R]]
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;
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%lt = icmp slt i32 %a, %b
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%lt8 = sext i1 %lt to i8
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%gt = icmp ne i32 %a, %b
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%gt8 = zext i1 %gt to i8
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%r = add i8 %lt8, %gt8
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ret i8 %r
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}
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; Negative test: mismatched signedness of predicates
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define i8 @signed_add_neg3(i32 %a, i32 %b) {
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; CHECK-LABEL: define i8 @signed_add_neg3(
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; CHECK-SAME: i32 [[A:%.*]], i32 [[B:%.*]]) {
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; CHECK-NEXT: [[LT:%.*]] = icmp slt i32 [[A]], [[B]]
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; CHECK-NEXT: [[LT8:%.*]] = sext i1 [[LT]] to i8
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; CHECK-NEXT: [[GT:%.*]] = icmp ugt i32 [[A]], [[B]]
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; CHECK-NEXT: [[GT8:%.*]] = zext i1 [[GT]] to i8
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; CHECK-NEXT: [[R:%.*]] = add nsw i8 [[LT8]], [[GT8]]
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; CHECK-NEXT: ret i8 [[R]]
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;
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%lt = icmp slt i32 %a, %b
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%lt8 = sext i1 %lt to i8
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%gt = icmp ugt i32 %a, %b
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%gt8 = zext i1 %gt to i8
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%r = add i8 %lt8, %gt8
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ret i8 %r
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}
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; Negative test: zext instead of sext or vice-versa (NOT commuted operands)
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define i8 @signed_add_neg4(i32 %a, i32 %b) {
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; CHECK-LABEL: define i8 @signed_add_neg4(
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; CHECK-SAME: i32 [[A:%.*]], i32 [[B:%.*]]) {
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; CHECK-NEXT: [[LT:%.*]] = icmp slt i32 [[A]], [[B]]
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; CHECK-NEXT: [[LT8:%.*]] = sext i1 [[LT]] to i8
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; CHECK-NEXT: [[GT:%.*]] = icmp sgt i32 [[A]], [[B]]
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; CHECK-NEXT: [[GT8:%.*]] = sext i1 [[GT]] to i8
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; CHECK-NEXT: [[R:%.*]] = add nsw i8 [[LT8]], [[GT8]]
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; CHECK-NEXT: ret i8 [[R]]
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;
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%lt = icmp slt i32 %a, %b
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%lt8 = sext i1 %lt to i8
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%gt = icmp sgt i32 %a, %b
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%gt8 = sext i1 %gt to i8
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%r = add i8 %lt8, %gt8
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ret i8 %r
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}
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define i8 @signed_add_neg5(i32 %a, i32 %b) {
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; CHECK-LABEL: define i8 @signed_add_neg5(
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; CHECK-SAME: i32 [[A:%.*]], i32 [[B:%.*]]) {
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; CHECK-NEXT: [[LT:%.*]] = icmp slt i32 [[A]], [[B]]
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; CHECK-NEXT: [[LT8:%.*]] = zext i1 [[LT]] to i8
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; CHECK-NEXT: [[GT:%.*]] = icmp sgt i32 [[A]], [[B]]
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; CHECK-NEXT: [[GT8:%.*]] = zext i1 [[GT]] to i8
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; CHECK-NEXT: [[R:%.*]] = add nuw nsw i8 [[LT8]], [[GT8]]
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; CHECK-NEXT: ret i8 [[R]]
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;
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%lt = icmp slt i32 %a, %b
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%lt8 = zext i1 %lt to i8
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%gt = icmp sgt i32 %a, %b
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%gt8 = zext i1 %gt to i8
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%r = add i8 %lt8, %gt8
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ret i8 %r
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}
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