| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; Test that the strncmp library call simplifier works correctly. |
| ; RUN: opt < %s -instcombine -S | FileCheck %s |
| |
| target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128" |
| |
| @hello = constant [6 x i8] c"hello\00" |
| @hell = constant [5 x i8] c"hell\00" |
| @bell = constant [5 x i8] c"bell\00" |
| @null = constant [1 x i8] zeroinitializer |
| |
| declare i32 @strncmp(i8*, i8*, i32) |
| |
| ; strncmp("", x, n) -> -*x |
| define i32 @test1(i8* %str2) { |
| ; CHECK-LABEL: @test1( |
| ; CHECK-NEXT: [[STRCMPLOAD:%.*]] = load i8, i8* [[STR2:%.*]], align 1 |
| ; CHECK-NEXT: [[TMP1:%.*]] = zext i8 [[STRCMPLOAD]] to i32 |
| ; CHECK-NEXT: [[TMP2:%.*]] = sub nsw i32 0, [[TMP1]] |
| ; CHECK-NEXT: ret i32 [[TMP2]] |
| ; |
| |
| %str1 = getelementptr inbounds [1 x i8], [1 x i8]* @null, i32 0, i32 0 |
| %temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 10) |
| ret i32 %temp1 |
| } |
| |
| ; strncmp(x, "", n) -> *x |
| define i32 @test2(i8* %str1) { |
| ; CHECK-LABEL: @test2( |
| ; CHECK-NEXT: [[STRCMPLOAD:%.*]] = load i8, i8* [[STR1:%.*]], align 1 |
| ; CHECK-NEXT: [[TMP1:%.*]] = zext i8 [[STRCMPLOAD]] to i32 |
| ; CHECK-NEXT: ret i32 [[TMP1]] |
| ; |
| |
| %str2 = getelementptr inbounds [1 x i8], [1 x i8]* @null, i32 0, i32 0 |
| %temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 10) |
| ret i32 %temp1 |
| } |
| |
| ; strncmp(x, y, n) -> cnst |
| define i32 @test3() { |
| ; CHECK-LABEL: @test3( |
| ; CHECK-NEXT: ret i32 -1 |
| ; |
| |
| %str1 = getelementptr inbounds [5 x i8], [5 x i8]* @hell, i32 0, i32 0 |
| %str2 = getelementptr inbounds [6 x i8], [6 x i8]* @hello, i32 0, i32 0 |
| %temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 10) |
| ret i32 %temp1 |
| } |
| |
| define i32 @test4() { |
| ; CHECK-LABEL: @test4( |
| ; CHECK-NEXT: ret i32 1 |
| ; |
| |
| %str1 = getelementptr inbounds [5 x i8], [5 x i8]* @hell, i32 0, i32 0 |
| %str2 = getelementptr inbounds [1 x i8], [1 x i8]* @null, i32 0, i32 0 |
| %temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 10) |
| ret i32 %temp1 |
| } |
| |
| define i32 @test5() { |
| ; CHECK-LABEL: @test5( |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| |
| %str1 = getelementptr inbounds [5 x i8], [5 x i8]* @hell, i32 0, i32 0 |
| %str2 = getelementptr inbounds [6 x i8], [6 x i8]* @hello, i32 0, i32 0 |
| %temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 4) |
| ret i32 %temp1 |
| } |
| |
| ; strncmp(x,y,1) -> memcmp(x,y,1) |
| define i32 @test6(i8* %str1, i8* %str2) { |
| ; CHECK-LABEL: @test6( |
| ; CHECK-NEXT: [[LHSC:%.*]] = load i8, i8* [[STR1:%.*]], align 1 |
| ; CHECK-NEXT: [[LHSV:%.*]] = zext i8 [[LHSC]] to i32 |
| ; CHECK-NEXT: [[RHSC:%.*]] = load i8, i8* [[STR2:%.*]], align 1 |
| ; CHECK-NEXT: [[RHSV:%.*]] = zext i8 [[RHSC]] to i32 |
| ; CHECK-NEXT: [[CHARDIFF:%.*]] = sub nsw i32 [[LHSV]], [[RHSV]] |
| ; CHECK-NEXT: ret i32 [[CHARDIFF]] |
| ; |
| |
| %temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 1) |
| ret i32 %temp1 |
| } |
| |
| ; strncmp(x,y,0) -> 0 |
| define i32 @test7(i8* %str1, i8* %str2) { |
| ; CHECK-LABEL: @test7( |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| |
| %temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 0) |
| ret i32 %temp1 |
| } |
| |
| ; strncmp(x,x,n) -> 0 |
| define i32 @test8(i8* %str, i32 %n) { |
| ; CHECK-LABEL: @test8( |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| |
| %temp1 = call i32 @strncmp(i8* %str, i8* %str, i32 %n) |
| ret i32 %temp1 |
| } |
| |
| ; strncmp(nonnull x, nonnull y, n) -> strncmp(x, y, n) |
| define i32 @test9(i8* %str1, i8* %str2, i32 %n) { |
| ; CHECK-LABEL: @test9( |
| ; CHECK-NEXT: [[TEMP1:%.*]] = call i32 @strncmp(i8* nonnull [[STR1:%.*]], i8* nonnull [[STR2:%.*]], i32 [[N:%.*]]) |
| ; CHECK-NEXT: ret i32 [[TEMP1]] |
| ; |
| |
| %temp1 = call i32 @strncmp(i8* nonnull %str1, i8* nonnull %str2, i32 %n) |
| ret i32 %temp1 |
| } |
| |
| ; strncmp(nonnull x, nonnull y, 0) -> 0 |
| define i32 @test10(i8* %str1, i8* %str2, i32 %n) { |
| ; CHECK-LABEL: @test10( |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| |
| %temp1 = call i32 @strncmp(i8* nonnull %str1, i8* nonnull %str2, i32 0) |
| ret i32 %temp1 |
| } |
| |
| ; strncmp(x, y, 5) -> strncmp(nonnull x, nonnull y, 5) |
| define i32 @test11(i8* %str1, i8* %str2, i32 %n) { |
| ; CHECK-LABEL: @test11( |
| ; CHECK-NEXT: [[TEMP1:%.*]] = call i32 @strncmp(i8* noundef nonnull dereferenceable(1) [[STR1:%.*]], i8* noundef nonnull dereferenceable(1) [[STR2:%.*]], i32 5) |
| ; CHECK-NEXT: ret i32 [[TEMP1]] |
| ; |
| |
| %temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 5) |
| ret i32 %temp1 |
| } |
| |
| define i32 @test12(i8* %str1, i8* %str2, i32 %n) null_pointer_is_valid { |
| ; CHECK-LABEL: @test12( |
| ; CHECK-NEXT: [[TEMP1:%.*]] = call i32 @strncmp(i8* [[STR1:%.*]], i8* [[STR2:%.*]], i32 [[N:%.*]]) |
| ; CHECK-NEXT: ret i32 [[TEMP1]] |
| ; |
| |
| %temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 %n) |
| ret i32 %temp1 |
| } |