#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*/ atoi(char *);
int /*<<< orphan*/ exit(int);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, void *);
int /*<<< orphan*/ free(void *);
void *malloc(int /*<<< orphan*/);
int /*<<< orphan*/ printf(char *, void *);
int /*<<< orphan*/ stderr;
int main(int argc, char *argv[]) {
  void *mem = malloc(atoi(argv[1]));
  if (!mem) {
    fprintf(stderr, "failed to allocate, mem = %p\n", mem);
    exit(1);
  }
  printf("mem: %p\n", mem);
  free(mem);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1070 <atoi@plt>
mov    %eax,%edi
call   1060 <malloc@plt>
mov    %rax,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
jne    11bc <main+0x5c>
mov    0x2e40(%rip),%rax
mov    (%rax),%edi
mov    -0x18(%rbp),%rdx
lea    0xe53(%rip),%rsi
call   1050 <fprintf@plt>
mov    $0x1,%edi
call   1080 <exit@plt>
mov    -0x18(%rbp),%rsi
lea    0xe57(%rip),%rdi
call   1040 <printf@plt>
mov    -0x18(%rbp),%rdi
call   1030 <free@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
mov    0x8(%rsi),%rdi
call   1070 <atoi@plt>
mov    %eax,%edi
call   1060 <malloc@plt>
test   %rax,%rax
je     1194 <main+0x34>
mov    %rax,%rbx
lea    0xe9e(%rip),%rdi
mov    %rax,%rsi
call   1040 <printf@plt>
mov    %rbx,%rdi
call   1030 <free@plt>
xor    %eax,%eax
pop    %rbx
ret
mov    0x2e45(%rip),%rax
mov    (%rax),%edi
lea    0xe5c(%rip),%rsi
xor    %edx,%edx
call   1050 <fprintf@plt>
mov    $0x1,%edi
call   1080 <exit@plt>

LLVM IR (-O0):
@stderr = global i32 0
@.str = [30 x i8] c"failed to allocate, mem = %p\0A\00"
@.str.1 = [9 x i8] c"mem: %p\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i8*
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%7 = load i8**, i8*** %5
%8 = getelementptr inbounds i8*, i8** %7, i64 1
%9 = load i8*, i8** %8
%10 = call i32 @atoi(i8* %9)
%11 = call i8* @malloc(i32 %10)
store i8* %11, i8** %6
%12 = load i8*, i8** %6
%13 = icmp ne i8* %12, null
br i1 %13, label %19, label %14
14: ; preds = %2
%15 = load i32, i32* @stderr
%16 = load i8*, i8** %6
%17 = call i32 @fprintf(i32 %15, i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str, i64 0, i64 0), i8* %16)
%18 = call i32 @exit(i32 1)
unreachable
19: ; preds = %2
%20 = load i8*, i8** %6
%21 = call i32 @printf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), i8* %20)
%22 = load i8*, i8** %6
%23 = call i32 @free(i8* %22)
ret i32 0
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [30 x i8] c"failed to allocate, mem = %p\0A\00"
@.str.1 = [9 x i8] c"mem: %p\0A\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = getelementptr inbounds i8*, i8** %1, i64 1
%4 = load i8*, i8** %3
%5 = tail call i32 @atoi(i8* %4)
%6 = tail call i8* @malloc(i32 %5)
%7 = icmp eq i8* %6, null
br i1 %7, label %8, label %12
8: ; preds = %2
%9 = load i32, i32* @stderr
%10 = tail call i32 @fprintf(i32 %9, i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str, i64 0, i64 0), i8* null)
%11 = tail call i32 @exit(i32 1)
unreachable
12: ; preds = %2
%13 = tail call i32 @printf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), i8* %6)
%14 = tail call i32 @free(i8* %6)
ret i32 0
}