#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
int /*<<< orphan*/ free(char *);
scalar_t__ malloc(int);
int /*<<< orphan*/ printf(char *, char *);
scalar_t__ realloc(char *, int);
int /*<<< orphan*/ strcpy(char *, char *);
int main() {
  char *str = (char *)malloc(15);
  strcpy(str, "hello world");
  printf("%s\n", str);
  str = (char *)realloc(str, 25);
  printf("%s\n", str);
  free(str);
  return (0);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
mov    $0xf,%edi
call   1060 <malloc@plt>
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xe88(%rip),%rsi
call   1040 <strcpy@plt>
mov    -0x10(%rbp),%rsi
lea    0xe84(%rip),%rdi
call   1050 <printf@plt>
mov    -0x10(%rbp),%rdi
mov    $0x19,%esi
call   1070 <realloc@plt>
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rsi
lea    0xe62(%rip),%rdi
call   1050 <printf@plt>
mov    -0x10(%rbp),%rdi
call   1030 <free@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
push   %rax
mov    $0xf,%edi
call   1060 <malloc@plt>
mov    %rax,%rbx
lea    0xe98(%rip),%rsi
mov    %rax,%rdi
call   1040 <strcpy@plt>
lea    0xe95(%rip),%r14
mov    %r14,%rdi
mov    %rbx,%rsi
call   1050 <printf@plt>
mov    %rbx,%rdi
mov    $0x19,%esi
call   1070 <realloc@plt>
mov    %rax,%rbx
mov    %r14,%rdi
mov    %rax,%rsi
call   1050 <printf@plt>
mov    %rbx,%rdi
call   1030 <free@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [12 x i8] c"hello world\00"
@.str.1 = [4 x i8] c"%s\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i8*
store i32 0, i32* %1
%3 = call i64 @malloc(i32 15)
%4 = inttoptr i64 %3 to i8*
store i8* %4, i8** %2
%5 = load i8*, i8** %2
%6 = call i32 @strcpy(i8* %5, i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i64 0, i64 0))
%7 = load i8*, i8** %2
%8 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i8* %7)
%9 = load i8*, i8** %2
%10 = call i64 @realloc(i8* %9, i32 25)
%11 = inttoptr i64 %10 to i8*
store i8* %11, i8** %2
%12 = load i8*, i8** %2
%13 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i8* %12)
%14 = load i8*, i8** %2
%15 = call i32 @free(i8* %14)
ret i32 0
}

LLVM IR (-O2):
@.str = [12 x i8] c"hello world\00"
@.str.1 = [4 x i8] c"%s\0A\00"
define i32 @main() {
%1 = tail call i64 @malloc(i32 15)
%2 = inttoptr i64 %1 to i8*
%3 = tail call i32 @strcpy(i8* %2, i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i64 0, i64 0))
%4 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i8* %2)
%5 = tail call i64 @realloc(i8* %2, i32 25)
%6 = inttoptr i64 %5 to i8*
%7 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i8* %6)
%8 = tail call i32 @free(i8* %6)
ret i32 0
}