#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 */
char *calloc(int, int);
int /*<<< orphan*/ free(char *);
int /*<<< orphan*/ printf(char *, char);
char *realloc(int /*<<< orphan*/ *, int);
int main(void) {
  char *p1 = calloc(10, sizeof(char));
  char *p2 = realloc(NULL, 5);
  int i;
  for (i = 0; i < 20; i++)
    printf("%d\n", p2[i]);
  free(p2);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    $0xa,%edi
mov    $0x1,%esi
call   1050 <calloc@plt>
mov    %rax,-0x10(%rbp)
xor    %eax,%eax
mov    %eax,%edi
mov    $0x5,%esi
call   1060 <realloc@plt>
mov    %rax,-0x18(%rbp)
movl   $0x0,-0x1c(%rbp)
cmpl   $0x14,-0x1c(%rbp)
jge    11ab <main+0x6b>
mov    -0x18(%rbp),%rax
movslq -0x1c(%rbp),%rcx
lea    0xe6c(%rip),%rdi
movsbl (%rax,%rcx,1),%esi
call   1040 <printf@plt>
mov    -0x1c(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x1c(%rbp)
jmp    117b <main+0x3b>
mov    -0x18(%rbp),%rdi
call   1030 <free@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
push   %rax
xor    %edi,%edi
mov    $0x5,%esi
call   1050 <realloc@plt>
mov    %rax,%rbx
movsbl (%rax),%esi
lea    0xeb3(%rip),%r14
mov    %r14,%rdi
call   1040 <printf@plt>
movsbl 0x1(%rbx),%esi
mov    %r14,%rdi
call   1040 <printf@plt>
movsbl 0x2(%rbx),%esi
mov    %r14,%rdi
call   1040 <printf@plt>
movsbl 0x3(%rbx),%esi
mov    %r14,%rdi
call   1040 <printf@plt>
movsbl 0x4(%rbx),%esi
mov    %r14,%rdi
call   1040 <printf@plt>
movsbl 0x5(%rbx),%esi
mov    %r14,%rdi
call   1040 <printf@plt>
movsbl 0x6(%rbx),%esi
mov    %r14,%rdi
call   1040 <printf@plt>
movsbl 0x7(%rbx),%esi
mov    %r14,%rdi
call   1040 <printf@plt>
movsbl 0x8(%rbx),%esi
mov    %r14,%rdi
call   1040 <printf@plt>
movsbl 0x9(%rbx),%esi
mov    %r14,%rdi
call   1040 <printf@plt>
movsbl 0xa(%rbx),%esi
mov    %r14,%rdi
call   1040 <printf@plt>
movsbl 0xb(%rbx),%esi
mov    %r14,%rdi
call   1040 <printf@plt>
movsbl 0xc(%rbx),%esi
mov    %r14,%rdi
call   1040 <printf@plt>
movsbl 0xd(%rbx),%esi
mov    %r14,%rdi
call   1040 <printf@plt>
movsbl 0xe(%rbx),%esi
mov    %r14,%rdi
call   1040 <printf@plt>
movsbl 0xf(%rbx),%esi
mov    %r14,%rdi
call   1040 <printf@plt>
movsbl 0x10(%rbx),%esi
mov    %r14,%rdi
call   1040 <printf@plt>
movsbl 0x11(%rbx),%esi
mov    %r14,%rdi
call   1040 <printf@plt>
movsbl 0x12(%rbx),%esi
mov    %r14,%rdi
call   1040 <printf@plt>
movsbl 0x13(%rbx),%esi
mov    %r14,%rdi
call   1040 <printf@plt>
mov    %rbx,%rdi
call   1030 <free@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [4 x i8] c"%d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i8*
%3 = alloca i8*
%4 = alloca i32
store i32 0, i32* %1
%5 = call i8* @calloc(i32 10, i32 1)
store i8* %5, i8** %2
%6 = call i8* @realloc(i32* null, i32 5)
store i8* %6, i8** %3
store i32 0, i32* %4
br label %7
7: ; preds = %17, %0
%8 = load i32, i32* %4
%9 = icmp slt i32 %8, 20
br i1 %9, label %10, label %20
10: ; preds = %7
%11 = load i8*, i8** %3
%12 = load i32, i32* %4
%13 = sext i32 %12 to i64
%14 = getelementptr inbounds i8, i8* %11, i64 %13
%15 = load i8, i8* %14
%16 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8 signext %15)
br label %17
17: ; preds = %10
%18 = load i32, i32* %4
%19 = add nsw i32 %18, 1
store i32 %19, i32* %4
br label %7
20: ; preds = %7
%21 = load i8*, i8** %3
%22 = call i32 @free(i8* %21)
ret i32 0
}

LLVM IR (-O2):
@.str = [4 x i8] c"%d\0A\00"
define i32 @main() {
%1 = tail call i8* @realloc(i32* null, i32 5)
%2 = load i8, i8* %1
%3 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8 signext %2)
%4 = getelementptr inbounds i8, i8* %1, i64 1
%5 = load i8, i8* %4
%6 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8 signext %5)
%7 = getelementptr inbounds i8, i8* %1, i64 2
%8 = load i8, i8* %7
%9 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8 signext %8)
%10 = getelementptr inbounds i8, i8* %1, i64 3
%11 = load i8, i8* %10
%12 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8 signext %11)
%13 = getelementptr inbounds i8, i8* %1, i64 4
%14 = load i8, i8* %13
%15 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8 signext %14)
%16 = getelementptr inbounds i8, i8* %1, i64 5
%17 = load i8, i8* %16
%18 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8 signext %17)
%19 = getelementptr inbounds i8, i8* %1, i64 6
%20 = load i8, i8* %19
%21 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8 signext %20)
%22 = getelementptr inbounds i8, i8* %1, i64 7
%23 = load i8, i8* %22
%24 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8 signext %23)
%25 = getelementptr inbounds i8, i8* %1, i64 8
%26 = load i8, i8* %25
%27 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8 signext %26)
%28 = getelementptr inbounds i8, i8* %1, i64 9
%29 = load i8, i8* %28
%30 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8 signext %29)
%31 = getelementptr inbounds i8, i8* %1, i64 10
%32 = load i8, i8* %31
%33 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8 signext %32)
%34 = getelementptr inbounds i8, i8* %1, i64 11
%35 = load i8, i8* %34
%36 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8 signext %35)
%37 = getelementptr inbounds i8, i8* %1, i64 12
%38 = load i8, i8* %37
%39 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8 signext %38)
%40 = getelementptr inbounds i8, i8* %1, i64 13
%41 = load i8, i8* %40
%42 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8 signext %41)
%43 = getelementptr inbounds i8, i8* %1, i64 14
%44 = load i8, i8* %43
%45 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8 signext %44)
%46 = getelementptr inbounds i8, i8* %1, i64 15
%47 = load i8, i8* %46
%48 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8 signext %47)
%49 = getelementptr inbounds i8, i8* %1, i64 16
%50 = load i8, i8* %49
%51 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8 signext %50)
%52 = getelementptr inbounds i8, i8* %1, i64 17
%53 = load i8, i8* %52
%54 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8 signext %53)
%55 = getelementptr inbounds i8, i8* %1, i64 18
%56 = load i8, i8* %55
%57 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8 signext %56)
%58 = getelementptr inbounds i8, i8* %1, i64 19
%59 = load i8, i8* %58
%60 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8 signext %59)
%61 = tail call i32 @free(i8* %1)
ret i32 0
}