1 ; Test that the stpcpy library call simplifier works correctly.
2 ; RUN: opt < %s -instcombine -S | FileCheck %s
4 ; This transformation requires the pointer size, as it assumes that size_t is
5 ; the size of a pointer.
6 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-n8:16:32"
8 @hello = constant [6 x i8] c"hello\00"
9 @a = common global [32 x i8] zeroinitializer, align 1
10 @b = common global [32 x i8] zeroinitializer, align 1
12 declare i8* @stpcpy(i8*, i8*)
14 define i8* @test_simplify1() {
15 ; CHECK-LABEL: @test_simplify1(
17 %dst = getelementptr [32 x i8], [32 x i8]* @a, i32 0, i32 0
18 %src = getelementptr [6 x i8], [6 x i8]* @hello, i32 0, i32 0
20 %ret = call i8* @stpcpy(i8* %dst, i8* %src)
21 ; CHECK: @llvm.memcpy.p0i8.p0i8.i32
22 ; CHECK-NEXT: getelementptr inbounds ([32 x i8], [32 x i8]* @a, i32 0, i32 5)
26 define i8* @test_simplify2() {
27 ; CHECK-LABEL: @test_simplify2(
29 %dst = getelementptr [32 x i8], [32 x i8]* @a, i32 0, i32 0
31 %ret = call i8* @stpcpy(i8* %dst, i8* %dst)
32 ; CHECK: [[LEN:%[a-z]+]] = call i32 @strlen
33 ; CHECK-NEXT: getelementptr inbounds [32 x i8], [32 x i8]* @a, i32 0, i32 [[LEN]]
37 define i8* @test_no_simplify1() {
38 ; CHECK-LABEL: @test_no_simplify1(
40 %dst = getelementptr [32 x i8], [32 x i8]* @a, i32 0, i32 0
41 %src = getelementptr [32 x i8], [32 x i8]* @b, i32 0, i32 0
43 %ret = call i8* @stpcpy(i8* %dst, i8* %src)
44 ; CHECK: call i8* @stpcpy