#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*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ printf(char *);
int /*<<< orphan*/ screen(int /*<<< orphan*/ *);
int main(int argc, char **argv) {
  FILE *fp;
  if (argc < 2) {
    printf("Usage: more [FILE]\n");
    return 0;
  }
  if (NULL == (fp = fopen(argv[1], "r"))) {
    printf("Can't open this file!\n");
    return 0;
  }
  screen(fp);
  fclose(fp);
  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   $0x2,-0x8(%rbp)
jge    1178 <main+0x38>
lea    0xe99(%rip),%rdi
call   1050 <printf@plt>
movl   $0x0,-0x4(%rbp)
jmp    11cf <main+0x8f>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
lea    0xe8d(%rip),%rsi
call   1060 <fopen@plt>
mov    %rax,%rcx
mov    %rcx,-0x18(%rbp)
xor    %eax,%eax
cmp    %rcx,%rax
jne    11b6 <main+0x76>
lea    0xe71(%rip),%rdi
call   1050 <printf@plt>
movl   $0x0,-0x4(%rbp)
jmp    11cf <main+0x8f>
mov    -0x18(%rbp),%rdi
call   1030 <screen@plt>
mov    -0x18(%rbp),%rdi
call   1040 <fclose@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
cmp    $0x1,%edi
jg     114f <main+0xf>
lea    0xecb(%rip),%rdi
jmp    1180 <main+0x40>
mov    0x8(%rsi),%rdi
lea    0xea6(%rip),%rsi
call   1060 <fopen@plt>
test   %rax,%rax
je     1179 <main+0x39>
mov    %rax,%rbx
mov    %rax,%rdi
call   1030 <screen@plt>
mov    %rbx,%rdi
call   1050 <fclose@plt>
jmp    1185 <main+0x45>
lea    0xe82(%rip),%rdi
call   1040 <puts@plt>
xor    %eax,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [20 x i8] c"Usage: more [FILE]\0A\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [23 x i8] c"Can't open this file!\0A\00"
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 slt i32 %7, 2
br i1 %8, label %9, label %11
9: ; preds = %2
%10 = call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0))
store i32 0, i32* %3
br label %24
11: ; preds = %2
%12 = load i8**, i8*** %5
%13 = getelementptr inbounds i8*, i8** %12, i64 1
%14 = load i8*, i8** %13
%15 = call i32* @fopen(i8* %14, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
store i32* %15, i32** %6
%16 = icmp eq i32* null, %15
br i1 %16, label %17, label %19
17: ; preds = %11
%18 = call i32 @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.2, i64 0, i64 0))
store i32 0, i32* %3
br label %24
19: ; preds = %11
%20 = load i32*, i32** %6
%21 = call i32 @screen(i32* %20)
%22 = load i32*, i32** %6
%23 = call i32 @fclose(i32* %22)
store i32 0, i32* %3
br label %24
24: ; preds = %19, %17, %9
%25 = load i32, i32* %3
ret i32 %25
}

LLVM IR (-O2):
@.str.1 = [2 x i8] c"r\00"
@str = [22 x i8] c"Can't open this file!\00"
@str.3 = [19 x i8] c"Usage: more [FILE]\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp slt i32 %0, 2
br i1 %3, label %4, label %6
4: ; preds = %2
%5 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([19 x i8], [19 x i8]* @str.3, i64 0, i64 0))
br label %16
6: ; preds = %2
%7 = getelementptr inbounds i8*, i8** %1, i64 1
%8 = load i8*, i8** %7
%9 = tail call i32* @fopen(i8* %8, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%10 = icmp eq i32* %9, null
br i1 %10, label %11, label %13
11: ; preds = %6
%12 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([22 x i8], [22 x i8]* @str, i64 0, i64 0))
br label %16
13: ; preds = %6
%14 = tail call i32 @screen(i32* %9)
%15 = tail call i32 @fclose(i32* %9)
br label %16
16: ; preds = %13, %11, %4
ret i32 0
}