#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 */
typedef int /*<<< orphan*/ FILE;

/* Variables and functions */
int /*<<< orphan*/ EXIT_FAILURE;
int /*<<< orphan*/ assert(int);
int /*<<< orphan*/ errno;
int /*<<< orphan*/ exit(int /*<<< orphan*/);
int /*<<< orphan*/ *fopen(char const *, char const *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char const *, char *);
int /*<<< orphan*/ stderr;
char *strerror(int /*<<< orphan*/);
FILE *xfopen(const char *fname, const char *mode) {
  FILE *file;
  assert(fname != NULL && mode != NULL);
  file = fopen(fname, mode);
  if (file == NULL) {
    fprintf(stderr, "Error by opening '%s', %s\n", fname, strerror(errno));
    exit(EXIT_FAILURE);
  }
  return file;
}


x86 assembly (clang, -O0):
<xfopen>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
xor    %eax,%eax
cmpq   $0x0,-0x8(%rbp)
mov    %al,-0x19(%rbp)
je     117b <xfopen+0x2b>
cmpq   $0x0,-0x10(%rbp)
setne  %al
mov    %al,-0x19(%rbp)
mov    -0x19(%rbp),%al
and    $0x1,%al
movzbl %al,%edi
call   1030 <assert@plt>
mov    -0x8(%rbp),%rdi
mov    -0x10(%rbp),%rsi
call   1050 <fopen@plt>
mov    %rax,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
jne    11ea <xfopen+0x9a>
mov    0x2e35(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x2c(%rbp)
mov    -0x8(%rbp),%rax
mov    %rax,-0x28(%rbp)
mov    0x2e19(%rip),%rax
mov    (%rax),%edi
call   1070 <strerror@plt>
mov    -0x2c(%rbp),%edi
mov    -0x28(%rbp),%rdx
mov    %rax,%rcx
lea    0xe29(%rip),%rsi
call   1040 <fprintf@plt>
mov    0x2ded(%rip),%rax
mov    (%rax),%edi
call   1060 <exit@plt>
mov    -0x18(%rbp),%rax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<xfopen>:
push   %r14
push   %rbx
push   %rax
mov    %rsi,%rbx
mov    %rdi,%r14
test   %rdi,%rdi
setne  %al
test   %rsi,%rsi
setne  %cl
and    %al,%cl
movzbl %cl,%edi
call   1030 <assert@plt>
mov    %r14,%rdi
mov    %rbx,%rsi
call   1050 <fopen@plt>
test   %rax,%rax
je     1188 <xfopen+0x38>
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret
mov    0x2e51(%rip),%rax
mov    (%rax),%ebx
mov    0x2e40(%rip),%rax
mov    (%rax),%edi
call   1070 <strerror@plt>
lea    0xe5a(%rip),%rsi
mov    %ebx,%edi
mov    %r14,%rdx
mov    %rax,%rcx
call   1040 <fprintf@plt>
mov    0x2e16(%rip),%rax
mov    (%rax),%edi
call   1060 <exit@plt>

LLVM IR (-O0):
@stderr = global i32 0
@.str = [27 x i8] c"Error by opening '%s', %s\0A\00"
@errno = global i32 0
@EXIT_FAILURE = global i32 0
define i32* @xfopen(i8* %0, i8* %1) {
%3 = alloca i8*
%4 = alloca i8*
%5 = alloca i32*
store i8* %0, i8** %3
store i8* %1, i8** %4
%6 = load i8*, i8** %3
%7 = icmp ne i8* %6, null
br i1 %7, label %8, label %11
8: ; preds = %2
%9 = load i8*, i8** %4
%10 = icmp ne i8* %9, null
br label %11
11: ; preds = %8, %2
%12 = phi i1 [ false, %2 ], [ %10, %8 ]
%13 = zext i1 %12 to i32
%14 = call i32 @assert(i32 %13)
%15 = load i8*, i8** %3
%16 = load i8*, i8** %4
%17 = call i32* @fopen(i8* %15, i8* %16)
store i32* %17, i32** %5
%18 = load i32*, i32** %5
%19 = icmp eq i32* %18, null
br i1 %19, label %20, label %28
20: ; preds = %11
%21 = load i32, i32* @stderr
%22 = load i8*, i8** %3
%23 = load i32, i32* @errno
%24 = call i8* @strerror(i32 %23)
%25 = call i32 @fprintf(i32 %21, i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str, i64 0, i64 0), i8* %22, i8* %24)
%26 = load i32, i32* @EXIT_FAILURE
%27 = call i32 @exit(i32 %26)
unreachable
28: ; preds = %11
%29 = load i32*, i32** %5
ret i32* %29
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [27 x i8] c"Error by opening '%s', %s\0A\00"
@errno = global i32 0
@EXIT_FAILURE = global i32 0
define noalias i32* @xfopen(i8* %0, i8* %1) {
%3 = icmp ne i8* %0, null
%4 = icmp ne i8* %1, null
%5 = and i1 %3, %4
%6 = zext i1 %5 to i32
%7 = tail call i32 @assert(i32 %6)
%8 = tail call i32* @fopen(i8* %0, i8* %1)
%9 = icmp eq i32* %8, null
br i1 %9, label %10, label %17
10: ; preds = %2
%11 = load i32, i32* @stderr
%12 = load i32, i32* @errno
%13 = tail call i8* @strerror(i32 %12)
%14 = tail call i32 @fprintf(i32 %11, i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str, i64 0, i64 0), i8* %0, i8* %13)
%15 = load i32, i32* @EXIT_FAILURE
%16 = tail call i32 @exit(i32 %15)
unreachable
17: ; preds = %2
ret i32* %8
}