1 ; Test that the stpcpy library call simplifier works correctly. 2 ; RUN: opt < %s -instcombine -S | FileCheck %s 3 ; 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" 7 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 11 12 declare i8* @stpcpy(i8*, i8*) 13 14 define i8* @test_simplify1() { 15 ; CHECK-LABEL: @test_simplify1( 16 17 %dst = getelementptr [32 x i8]* @a, i32 0, i32 0 18 %src = getelementptr [6 x i8]* @hello, i32 0, i32 0 19 20 %ret = call i8* @stpcpy(i8* %dst, i8* %src) 21 ; CHECK: @llvm.memcpy.p0i8.p0i8.i32 22 ; CHECK-NEXT: getelementptr inbounds ([32 x i8]* @a, i32 0, i32 5) 23 ret i8* %ret 24 } 25 26 define i8* @test_simplify2() { 27 ; CHECK-LABEL: @test_simplify2( 28 29 %dst = getelementptr [32 x i8]* @a, i32 0, i32 0 30 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]* @a, i32 0, i32 [[LEN]] 34 ret i8* %ret 35 } 36 37 define i8* @test_no_simplify1() { 38 ; CHECK-LABEL: @test_no_simplify1( 39 40 %dst = getelementptr [32 x i8]* @a, i32 0, i32 0 41 %src = getelementptr [32 x i8]* @b, i32 0, i32 0 42 43 %ret = call i8* @stpcpy(i8* %dst, i8* %src) 44 ; CHECK: call i8* @stpcpy 45 ret i8* %ret 46 } 47
