1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt < %s -passes=instsimplify -S | FileCheck %s 3 4; The first comparison (a != b) should not be dropped 5define i1 @test1(ptr %a, ptr %b) { 6; CHECK-LABEL: @test1( 7; CHECK-NEXT: [[COND1:%.*]] = icmp ne ptr [[A:%.*]], [[B:%.*]] 8; CHECK-NEXT: [[A2:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 -1 9; CHECK-NEXT: [[COND2:%.*]] = icmp ugt ptr [[A2]], [[B]] 10; CHECK-NEXT: [[RES:%.*]] = select i1 [[COND1]], i1 [[COND2]], i1 false 11; CHECK-NEXT: ret i1 [[RES]] 12; 13 %cond1 = icmp ne ptr %a, %b 14 %a2 = getelementptr inbounds i8, ptr %a, i64 -1 15 %cond2 = icmp ugt ptr %a2, %b 16 %res = select i1 %cond1, i1 %cond2, i1 false 17 ret i1 %res 18} 19 20; The first comparison (a != b) should not be dropped 21define i1 @test2(i32 %a, i32 %b) { 22; CHECK-LABEL: @test2( 23; CHECK-NEXT: [[COND1:%.*]] = icmp ne i32 [[A:%.*]], [[B:%.*]] 24; CHECK-NEXT: [[A2:%.*]] = add nuw i32 [[A]], 1 25; CHECK-NEXT: [[COND2:%.*]] = icmp ult i32 [[A2]], [[B]] 26; CHECK-NEXT: [[RES:%.*]] = select i1 [[COND1]], i1 [[COND2]], i1 false 27; CHECK-NEXT: ret i1 [[RES]] 28; 29 %cond1 = icmp ne i32 %a, %b 30 %a2 = add nuw i32 %a, 1 31 %cond2 = icmp ult i32 %a2, %b 32 %res = select i1 %cond1, i1 %cond2, i1 false 33 ret i1 %res 34} 35