| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -instsimplify -S | FileCheck %s |
| |
| ; The first comparison (a != b) should not be dropped |
| define i1 @test1(i8* %a, i8* %b) { |
| ; CHECK-LABEL: @test1( |
| ; CHECK-NEXT: [[COND1:%.*]] = icmp ne i8* [[A:%.*]], [[B:%.*]] |
| ; CHECK-NEXT: [[A2:%.*]] = getelementptr inbounds i8, i8* [[A]], i64 -1 |
| ; CHECK-NEXT: [[COND2:%.*]] = icmp ugt i8* [[A2]], [[B]] |
| ; CHECK-NEXT: [[RES:%.*]] = select i1 [[COND1]], i1 [[COND2]], i1 false |
| ; CHECK-NEXT: ret i1 [[RES]] |
| ; |
| %cond1 = icmp ne i8* %a, %b |
| %a2 = getelementptr inbounds i8, i8* %a, i64 -1 |
| %cond2 = icmp ugt i8* %a2, %b |
| %res = select i1 %cond1, i1 %cond2, i1 false |
| ret i1 %res |
| } |
| |
| ; The first comparison (a != b) should not be dropped |
| define i1 @test2(i32 %a, i32 %b) { |
| ; CHECK-LABEL: @test2( |
| ; CHECK-NEXT: [[COND1:%.*]] = icmp ne i32 [[A:%.*]], [[B:%.*]] |
| ; CHECK-NEXT: [[A2:%.*]] = add nuw i32 [[A]], 1 |
| ; CHECK-NEXT: [[COND2:%.*]] = icmp ult i32 [[A2]], [[B]] |
| ; CHECK-NEXT: [[RES:%.*]] = select i1 [[COND1]], i1 [[COND2]], i1 false |
| ; CHECK-NEXT: ret i1 [[RES]] |
| ; |
| %cond1 = icmp ne i32 %a, %b |
| %a2 = add nuw i32 %a, 1 |
| %cond2 = icmp ult i32 %a2, %b |
| %res = select i1 %cond1, i1 %cond2, i1 false |
| ret i1 %res |
| } |