#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(int);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char *);
int /*<<< orphan*/ sample2(int /*<<< orphan*/ *);
int /*<<< orphan*/ stderr;
int /*<<< orphan*/ *stdin;
int main(int argc, char **argv) {
  FILE *file;
  if (argc > 1) {
    file = fopen(argv[1], "rb");
    if (!file) {
      fprintf(stderr, "Could not open file %s\n", argv[1]);
      exit(1);
    }
  } else
    file = stdin;
  sample2(file);
  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)
cmpl   $0x1,-0x8(%rbp)
jle    11af <main+0x6f>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
lea    0xe91(%rip),%rsi
call   1040 <fopen@plt>
mov    %rax,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
jne    11aa <main+0x6a>
mov    0x2e4e(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdx
lea    0xe68(%rip),%rsi
call   1030 <fprintf@plt>
mov    $0x1,%edi
call   1060 <exit@plt>
jmp    11bd <main+0x7d>
mov    0x2e32(%rip),%rax
mov    (%rax),%rax
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rdi
call   1050 <sample2@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
cmp    $0x2,%edi
jl     1184 <main+0x44>
mov    %rsi,%rbx
mov    0x8(%rsi),%rdi
lea    0xeac(%rip),%rsi
call   1040 <fopen@plt>
mov    %rax,%rdi
test   %rax,%rax
jne    118e <main+0x4e>
mov    0x2e70(%rip),%rax
mov    (%rax),%edi
mov    0x8(%rbx),%rdx
lea    0xe8e(%rip),%rsi
call   1030 <fprintf@plt>
mov    $0x1,%edi
call   1060 <exit@plt>
mov    0x2e5d(%rip),%rax
mov    (%rax),%rdi
call   1050 <sample2@plt>
xor    %eax,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [3 x i8] c"rb\00"
@stderr = global i32 0
@.str.1 = [24 x i8] c"Could not open file %s\0A\00"
@stdin = global i32* null
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32*
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%7 = load i32, i32* %4
%8 = icmp sgt i32 %7, 1
br i1 %8, label %9, label %24
9: ; preds = %2
%10 = load i8**, i8*** %5
%11 = getelementptr inbounds i8*, i8** %10, i64 1
%12 = load i8*, i8** %11
%13 = call i32* @fopen(i8* %12, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
store i32* %13, i32** %6
%14 = load i32*, i32** %6
%15 = icmp ne i32* %14, null
br i1 %15, label %23, label %16
16: ; preds = %9
%17 = load i32, i32* @stderr
%18 = load i8**, i8*** %5
%19 = getelementptr inbounds i8*, i8** %18, i64 1
%20 = load i8*, i8** %19
%21 = call i32 @fprintf(i32 %17, i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.1, i64 0, i64 0), i8* %20)
%22 = call i32 @exit(i32 1)
unreachable
23: ; preds = %9
br label %26
24: ; preds = %2
%25 = load i32*, i32** @stdin
store i32* %25, i32** %6
br label %26
26: ; preds = %24, %23
%27 = load i32*, i32** %6
%28 = call i32 @sample2(i32* %27)
ret i32 0
}

LLVM IR (-O2):
@.str = [3 x i8] c"rb\00"
@stderr = global i32 0
@.str.1 = [24 x i8] c"Could not open file %s\0A\00"
@stdin = global i32* null
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp sgt i32 %0, 1
br i1 %3, label %4, label %14
4: ; preds = %2
%5 = getelementptr inbounds i8*, i8** %1, i64 1
%6 = load i8*, i8** %5
%7 = tail call i32* @fopen(i8* %6, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
%8 = icmp eq i32* %7, null
br i1 %8, label %9, label %16
9: ; preds = %4
%10 = load i32, i32* @stderr
%11 = load i8*, i8** %5
%12 = tail call i32 @fprintf(i32 %10, i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.1, i64 0, i64 0), i8* %11)
%13 = tail call i32 @exit(i32 1)
unreachable
14: ; preds = %2
%15 = load i32*, i32** @stdin
br label %16
16: ; preds = %4, %14
%17 = phi i32* [ %7, %4 ], [ %15, %14 ]
%18 = tail call i32 @sample2(i32* %17)
ret i32 0
}