#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);
scalar_t__ fgets(char *, int, int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ printf(char *, ...);
int main(int argc, char *argv[]) {
  FILE *fp;
  char buf[128];
  if (argc < 2) {
    printf("Filename is missing\n");
    exit(1);
  }
  fp = fopen(argv[1], "r");
  if (fp == 0) {
    printf("Could not open file\n");
    exit(2);
  }
  while (fgets(buf, 128, fp)) {
    printf("%s", buf);
  }
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0xa0,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x2,-0x8(%rbp)
jge    117b <main+0x3b>
lea    0xe96(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    $0x1,%edi
call   1060 <exit@plt>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
lea    0xe8b(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
jne    11b6 <main+0x76>
lea    0xe72(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    $0x2,%edi
call   1060 <exit@plt>
jmp    11bb <main+0x7b>
lea    -0xa0(%rbp),%rdi
mov    -0x18(%rbp),%rdx
mov    $0x80,%esi
call   1040 <fgets@plt>
cmp    $0x0,%rax
je     11f4 <main+0xb4>
lea    -0xa0(%rbp),%rsi
lea    0xe44(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    11bb <main+0x7b>
mov    -0x4(%rbp),%eax
add    $0xa0,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %rbx
sub    $0x80,%rsp
cmp    $0x1,%edi
jle    11d1 <main+0x81>
mov    0x8(%rsi),%rdi
lea    0xe94(%rip),%rsi
call   1060 <fopen@plt>
test   %rax,%rax
je     11e7 <main+0x97>
mov    %rax,%r15
mov    %rsp,%rdi
mov    $0x80,%esi
mov    %rax,%rdx
call   1050 <fgets@plt>
test   %rax,%rax
je     11c2 <main+0x72>
lea    0xe6d(%rip),%r14
mov    %rsp,%rbx
nopl   0x0(%rax,%rax,1)
mov    %r14,%rdi
mov    %rbx,%rsi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
mov    $0x80,%esi
mov    %r15,%rdx
call   1050 <fgets@plt>
test   %rax,%rax
jne    11a0 <main+0x50>
xor    %eax,%eax
add    $0x80,%rsp
pop    %rbx
pop    %r14
pop    %r15
ret
lea    0xe41(%rip),%rdi
call   1030 <puts@plt>
mov    $0x1,%edi
call   1070 <exit@plt>
lea    0xe17(%rip),%rdi
call   1030 <puts@plt>
mov    $0x2,%edi
call   1070 <exit@plt>

LLVM IR (-O0):
@.str = [21 x i8] c"Filename is missing\0A\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [21 x i8] c"Could not open file\0A\00"
@.str.3 = [3 x i8] c"%s\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32*
%7 = alloca [128 x i8]
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%8 = load i32, i32* %4
%9 = icmp slt i32 %8, 2
br i1 %9, label %10, label %13
10: ; preds = %2
%11 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str, i64 0, i64 0))
%12 = call i32 @exit(i32 1)
unreachable
13: ; preds = %2
%14 = load i8**, i8*** %5
%15 = getelementptr inbounds i8*, i8** %14, i64 1
%16 = load i8*, i8** %15
%17 = call i32* @fopen(i8* %16, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
store i32* %17, i32** %6
%18 = load i32*, i32** %6
%19 = icmp eq i32* %18, null
br i1 %19, label %20, label %23
20: ; preds = %13
%21 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.2, i64 0, i64 0))
%22 = call i32 @exit(i32 2)
unreachable
23: ; preds = %13
br label %24
24: ; preds = %29, %23
%25 = getelementptr inbounds [128 x i8], [128 x i8]* %7, i64 0, i64 0
%26 = load i32*, i32** %6
%27 = call i64 @fgets(i8* %25, i32 128, i32* %26)
%28 = icmp ne i64 %27, 0
br i1 %28, label %29, label %32
29: ; preds = %24
%30 = getelementptr inbounds [128 x i8], [128 x i8]* %7, i64 0, i64 0
%31 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.3, i64 0, i64 0), i8* %30)
br label %24
32: ; preds = %24
%33 = load i32, i32* %3
ret i32 %33
}

LLVM IR (-O2):
@.str.1 = [2 x i8] c"r\00"
@.str.3 = [3 x i8] c"%s\00"
@str = [20 x i8] c"Could not open file\00"
@str.4 = [20 x i8] c"Filename is missing\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = alloca [128 x i8]
%4 = getelementptr inbounds [128 x i8], [128 x i8]* %3, i64 0, i64 0
%5 = icmp slt i32 %0, 2
br i1 %5, label %6, label %9
6: ; preds = %2
%7 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([20 x i8], [20 x i8]* @str.4, i64 0, i64 0))
%8 = tail call i32 @exit(i32 1)
unreachable
9: ; preds = %2
%10 = getelementptr inbounds i8*, i8** %1, i64 1
%11 = load i8*, i8** %10
%12 = tail call i32* @fopen(i8* %11, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%13 = icmp eq i32* %12, null
br i1 %13, label %17, label %14
14: ; preds = %9
%15 = call i64 @fgets(i8* %4, i32 128, i32* %12)
%16 = icmp eq i64 %15, 0
br i1 %16, label %24, label %20
17: ; preds = %9
%18 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([20 x i8], [20 x i8]* @str, i64 0, i64 0))
%19 = tail call i32 @exit(i32 2)
unreachable
20: ; preds = %14, %20
%21 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str.3, i64 0, i64 0), i8* %4)
%22 = call i64 @fgets(i8* %4, i32 128, i32* %12)
%23 = icmp eq i64 %22, 0
br i1 %23, label %24, label %20
24: ; preds = %20, %14
ret i32 0
}