; 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-NOT: call i8* @strncat ; CHECK: ret void %dst = getelementptr [32 x i8]* @a, i32 0, i32 0 %src = getelementptr [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]* @a, i32 0, i32 0 %src = getelementptr [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]* @a, i32 0, i32 0 %src = getelementptr [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: call i8* @strncat ; CHECK: ret void %dst = getelementptr [32 x i8]* @a, i32 0, i32 0 %src = getelementptr [6 x i8]* @hello, i32 0, i32 0 call i8* @strncat(i8* %dst, i8* %src, i32 1) ret void }