1 ; Test that the strncat libcall simplifier works correctly. 2 ; 3 ; RUN: opt < %s -instcombine -S | FileCheck %s 4 5 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" 6 7 @hello = constant [6 x i8] c"hello\00" 8 @empty = constant [1 x i8] c"\00" 9 @a = common global [32 x i8] zeroinitializer, align 1 10 11 declare i8* @strncat(i8*, i8*, i32) 12 13 define void @test_simplify1() { 14 ; CHECK-LABEL: @test_simplify1( 15 ; CHECK-NOT: call i8* @strncat 16 ; CHECK: ret void 17 18 %dst = getelementptr [32 x i8]* @a, i32 0, i32 0 19 %src = getelementptr [6 x i8]* @hello, i32 0, i32 0 20 call i8* @strncat(i8* %dst, i8* %src, i32 13) 21 ret void 22 } 23 24 define void @test_simplify2() { 25 ; CHECK-LABEL: @test_simplify2( 26 ; CHECK-NEXT: ret void 27 28 %dst = getelementptr [32 x i8]* @a, i32 0, i32 0 29 %src = getelementptr [1 x i8]* @empty, i32 0, i32 0 30 call i8* @strncat(i8* %dst, i8* %src, i32 13) 31 ret void 32 } 33 34 define void @test_simplify3() { 35 ; CHECK-LABEL: @test_simplify3( 36 ; CHECK-NEXT: ret void 37 38 %dst = getelementptr [32 x i8]* @a, i32 0, i32 0 39 %src = getelementptr [6 x i8]* @hello, i32 0, i32 0 40 call i8* @strncat(i8* %dst, i8* %src, i32 0) 41 ret void 42 } 43 44 define void @test_nosimplify1() { 45 ; CHECK-LABEL: @test_nosimplify1( 46 ; CHECK: call i8* @strncat 47 ; CHECK: ret void 48 49 %dst = getelementptr [32 x i8]* @a, i32 0, i32 0 50 %src = getelementptr [6 x i8]* @hello, i32 0, i32 0 51 call i8* @strncat(i8* %dst, i8* %src, i32 1) 52 ret void 53 } 54
