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[InstSimplify] Add tests for pr49495 (NFC)

This commit is contained in:
Juneyoung Lee 2021-03-10 17:54:31 +09:00
parent dc8446c2a0
commit 3170978173
1 changed files with 30 additions and 0 deletions
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30
llvm/test/Transforms/InstSimplify/pr49495.ll Normal file
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; 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: [[A2:%.*]] = getelementptr inbounds i8, i8* [[A:%.*]], i64 -1
; CHECK-NEXT: [[COND2:%.*]] = icmp ugt i8* [[A2]], [[B:%.*]]
; CHECK-NEXT: ret i1 [[COND2]]
;
%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: [[A2:%.*]] = add nuw i32 [[A:%.*]], 1
; CHECK-NEXT: [[COND2:%.*]] = icmp ult i32 [[A2]], [[B:%.*]]
; CHECK-NEXT: ret i1 [[COND2]]
;
%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
}