#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 */
scalar_t__ malloc(int);
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, int *);
int main() {
  int *p = NULL;
  p = (int *)malloc(sizeof(char));
  if (p == NULL) {
    printf("malloc memory failed!");
    return 0;
  }
  scanf("%d", p);
  printf("%d", *p);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movq   $0x0,-0x10(%rbp)
mov    $0x1,%edi
call   1040 <malloc@plt>
mov    %rax,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
jne    117a <main+0x4a>
lea    0xe99(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0x4(%rbp)
jmp    11a5 <main+0x75>
mov    -0x10(%rbp),%rsi
lea    0xe91(%rip),%rdi
call   1050 <scanf@plt>
mov    -0x10(%rbp),%rax
mov    (%rax),%esi
lea    0xe7f(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
push   %rax
mov    $0x1,%edi
call   1040 <malloc@plt>
test   %rax,%rax
je     1166 <main+0x36>
mov    %rax,%rbx
lea    0xec9(%rip),%r14
mov    %r14,%rdi
mov    %rax,%rsi
call   1050 <scanf@plt>
mov    (%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
jmp    1174 <main+0x44>
lea    0xe93(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [22 x i8] c"malloc memory failed!\00"
@.str.1 = [3 x i8] c"%d\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32*
store i32 0, i32* %1
store i32* null, i32** %2
%3 = call i64 @malloc(i32 1)
%4 = inttoptr i64 %3 to i32*
store i32* %4, i32** %2
%5 = load i32*, i32** %2
%6 = icmp eq i32* %5, null
br i1 %6, label %7, label %9
7: ; preds = %0
%8 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str, i64 0, i64 0))
store i32 0, i32* %1
br label %15
9: ; preds = %0
%10 = load i32*, i32** %2
%11 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %10)
%12 = load i32*, i32** %2
%13 = load i32, i32* %12
%14 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32 %13)
store i32 0, i32* %1
br label %15
15: ; preds = %9, %7
%16 = load i32, i32* %1
ret i32 %16
}

LLVM IR (-O2):
@.str = [22 x i8] c"malloc memory failed!\00"
@.str.1 = [3 x i8] c"%d\00"
define i32 @main() {
%1 = tail call i64 @malloc(i32 1)
%2 = inttoptr i64 %1 to i32*
%3 = icmp eq i64 %1, 0
br i1 %3, label %4, label %6
4: ; preds = %0
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([22 x i8], [22 x i8]* @.str, i64 0, i64 0))
br label %10
6: ; preds = %0
%7 = tail call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
%8 = load i32, i32* %2
%9 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32 %8)
br label %10
10: ; preds = %6, %4
ret i32 0
}