| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; Test that the strncat libcall 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" |
| @empty = constant [1 x i8] c"\00" |
| @a = common global [32 x i8] zeroinitializer, align 1 |
| declare i8* @strncat(i8*, i8*, i32) |
| |
| define void @test_simplify1() { |
| ; CHECK-LABEL: @test_simplify1( |
| ; CHECK-NEXT: [[STRLEN:%.*]] = call i32 @strlen(i8* noundef nonnull dereferenceable(1) getelementptr inbounds ([32 x i8], [32 x i8]* @a, i32 0, i32 0)) |
| ; CHECK-NEXT: [[ENDPTR:%.*]] = getelementptr [32 x i8], [32 x i8]* @a, i32 0, i32 [[STRLEN]] |
| ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* noundef nonnull align 1 dereferenceable(6) [[ENDPTR]], i8* noundef nonnull align 1 dereferenceable(6) getelementptr inbounds ([6 x i8], [6 x i8]* @hello, i32 0, i32 0), i32 6, i1 false) |
| ; CHECK-NEXT: ret void |
| ; |
| |
| %dst = getelementptr [32 x i8], [32 x i8]* @a, i32 0, i32 0 |
| %src = getelementptr [6 x i8], [6 x i8]* @hello, i32 0, i32 0 |
| call i8* @strncat(i8* %dst, i8* %src, i32 13) |
| ret void |
| } |
| |
| define void @test_simplify2() { |
| ; CHECK-LABEL: @test_simplify2( |
| ; CHECK-NEXT: ret void |
| ; |
| |
| %dst = getelementptr [32 x i8], [32 x i8]* @a, i32 0, i32 0 |
| %src = getelementptr [1 x i8], [1 x i8]* @empty, i32 0, i32 0 |
| call i8* @strncat(i8* %dst, i8* %src, i32 13) |
| ret void |
| } |
| |
| define void @test_simplify3() { |
| ; CHECK-LABEL: @test_simplify3( |
| ; CHECK-NEXT: ret void |
| ; |
| |
| %dst = getelementptr [32 x i8], [32 x i8]* @a, i32 0, i32 0 |
| %src = getelementptr [6 x i8], [6 x i8]* @hello, i32 0, i32 0 |
| call i8* @strncat(i8* %dst, i8* %src, i32 0) |
| ret void |
| } |
| |
| define void @test_nosimplify1() { |
| ; CHECK-LABEL: @test_nosimplify1( |
| ; CHECK-NEXT: [[TMP1:%.*]] = call i8* @strncat(i8* noundef nonnull dereferenceable(1) getelementptr inbounds ([32 x i8], [32 x i8]* @a, i32 0, i32 0), i8* noundef nonnull dereferenceable(6) getelementptr inbounds ([6 x i8], [6 x i8]* @hello, i32 0, i32 0), i32 1) |
| ; CHECK-NEXT: ret void |
| ; |
| |
| %dst = getelementptr [32 x i8], [32 x i8]* @a, i32 0, i32 0 |
| %src = getelementptr [6 x i8], [6 x i8]* @hello, i32 0, i32 0 |
| call i8* @strncat(i8* %dst, i8* %src, i32 1) |
| ret void |
| } |
| |
| ; strncat(nonnull x, nonnull y, n) -> strncat(nonnull x, y, n) |
| define i8* @test1(i8* %str1, i8* %str2, i32 %n) { |
| ; CHECK-LABEL: @test1( |
| ; CHECK-NEXT: [[TEMP1:%.*]] = call i8* @strncat(i8* noundef nonnull [[STR1:%.*]], i8* nonnull [[STR2:%.*]], i32 [[N:%.*]]) |
| ; CHECK-NEXT: ret i8* [[TEMP1]] |
| ; |
| |
| %temp1 = call i8* @strncat(i8* nonnull %str1, i8* nonnull %str2, i32 %n) |
| ret i8* %temp1 |
| } |
| |
| ; strncat(x, y, 0) -> x |
| define i8* @test2(i8* %str1, i8* %str2, i32 %n) { |
| ; CHECK-LABEL: @test2( |
| ; CHECK-NEXT: ret i8* [[STR1:%.*]] |
| ; |
| |
| %temp1 = call i8* @strncat(i8* %str1, i8* %str2, i32 0) |
| ret i8* %temp1 |
| } |
| |
| ; strncat(x, y, 5) -> strncat(nonnull x, nonnull y, 5) |
| define i8* @test3(i8* %str1, i8* %str2, i32 %n) { |
| ; CHECK-LABEL: @test3( |
| ; CHECK-NEXT: [[TEMP1:%.*]] = call i8* @strncat(i8* noundef nonnull dereferenceable(1) [[STR1:%.*]], i8* noundef nonnull dereferenceable(1) [[STR2:%.*]], i32 5) |
| ; CHECK-NEXT: ret i8* [[TEMP1]] |
| ; |
| |
| %temp1 = call i8* @strncat(i8* %str1, i8* %str2, i32 5) |
| ret i8* %temp1 |
| } |
| |
| define i8* @test4(i8* %str1, i8* %str2, i32 %n) null_pointer_is_valid { |
| ; CHECK-LABEL: @test4( |
| ; CHECK-NEXT: [[TEMP1:%.*]] = call i8* @strncat(i8* noundef [[STR1:%.*]], i8* [[STR2:%.*]], i32 [[N:%.*]]) |
| ; CHECK-NEXT: ret i8* [[TEMP1]] |
| ; |
| |
| %temp1 = call i8* @strncat(i8* %str1, i8* %str2, i32 %n) |
| ret i8* %temp1 |
| } |
| |
| define i8* @test5(i8* %str, i32 %n) { |
| ; CHECK-LABEL: @test5( |
| ; CHECK-NEXT: [[STRLEN:%.*]] = call i32 @strlen(i8* noundef nonnull dereferenceable(1) [[STR:%.*]]) |
| ; CHECK-NEXT: [[ENDPTR:%.*]] = getelementptr i8, i8* [[STR]], i32 [[STRLEN]] |
| ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* noundef nonnull align 1 dereferenceable(6) [[ENDPTR]], i8* noundef nonnull align 1 dereferenceable(6) getelementptr inbounds ([6 x i8], [6 x i8]* @hello, i32 0, i32 0), i32 6, i1 false) |
| ; CHECK-NEXT: ret i8* [[STR]] |
| ; |
| %src = getelementptr [6 x i8], [6 x i8]* @hello, i32 0, i32 0 |
| %temp1 = call i8* @strncat(i8* %str, i8* %src, i32 10) |
| ret i8* %temp1 |
| } |