#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*/ EXIT_FAILURE;
int /*<<< orphan*/ exit(int /*<<< orphan*/);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *);
void *malloc(size_t);
int /*<<< orphan*/ stderr;
void *xmalloc(size_t amt) {
  void *p;
  if (amt == 0)
    return NULL;
  p = malloc(amt);
  if (p == NULL) {
    fprintf(stderr, "virtual memory exhausted\n");
    exit(EXIT_FAILURE);
  }
  return p;
}


x86 assembly (clang, -O0):
<xmalloc>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
jne    1154 <xmalloc+0x24>
movq   $0x0,-0x8(%rbp)
jmp    1197 <xmalloc+0x67>
mov    -0x10(%rbp),%rdi
call   1040 <malloc@plt>
mov    %rax,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
jne    118f <xmalloc+0x5f>
mov    0x2e6d(%rip),%rax
mov    (%rax),%edi
lea    0xe84(%rip),%rsi
call   1030 <fprintf@plt>
mov    0x2e50(%rip),%rax
mov    (%rax),%edi
call   1050 <exit@plt>
mov    -0x18(%rbp),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<xmalloc>:
push   %rax
test   %rdi,%rdi
je     1142 <xmalloc+0x12>
call   1040 <malloc@plt>
test   %rax,%rax
je     1146 <xmalloc+0x16>
pop    %rcx
ret
xor    %eax,%eax
pop    %rcx
ret
mov    0x2e93(%rip),%rax
mov    (%rax),%edi
lea    0xeaa(%rip),%rsi
call   1030 <fprintf@plt>
mov    0x2e76(%rip),%rax
mov    (%rax),%edi
call   1050 <exit@plt>

LLVM IR (-O0):
@stderr = global i32 0
@.str = [26 x i8] c"virtual memory exhausted\0A\00"
@EXIT_FAILURE = global i32 0
define i8* @xmalloc(i64 %0) {
%2 = alloca i8*
%3 = alloca i64
%4 = alloca i8*
store i64 %0, i64* %3
%5 = load i64, i64* %3
%6 = icmp eq i64 %5, 0
br i1 %6, label %7, label %8
7: ; preds = %1
store i8* null, i8** %2
br label %20
8: ; preds = %1
%9 = load i64, i64* %3
%10 = call i8* @malloc(i64 %9)
store i8* %10, i8** %4
%11 = load i8*, i8** %4
%12 = icmp eq i8* %11, null
br i1 %12, label %13, label %18
13: ; preds = %8
%14 = load i32, i32* @stderr
%15 = call i32 @fprintf(i32 %14, i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str, i64 0, i64 0))
%16 = load i32, i32* @EXIT_FAILURE
%17 = call i32 @exit(i32 %16)
unreachable
18: ; preds = %8
%19 = load i8*, i8** %4
store i8* %19, i8** %2
br label %20
20: ; preds = %18, %7
%21 = load i8*, i8** %2
ret i8* %21
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [26 x i8] c"virtual memory exhausted\0A\00"
@EXIT_FAILURE = global i32 0
define noalias i8* @xmalloc(i64 %0) {
%2 = icmp eq i64 %0, 0
br i1 %2, label %11, label %3
3: ; preds = %1
%4 = tail call i8* @malloc(i64 %0)
%5 = icmp eq i8* %4, null
br i1 %5, label %6, label %11
6: ; preds = %3
%7 = load i32, i32* @stderr
%8 = tail call i32 @fprintf(i32 %7, i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str, i64 0, i64 0))
%9 = load i32, i32* @EXIT_FAILURE
%10 = tail call i32 @exit(i32 %9)
unreachable
11: ; preds = %3, %1
%12 = phi i8* [ null, %1 ], [ %4, %3 ]
ret i8* %12
}