#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*/ read_file(char *);
int write(int, char *, int);
int main(int argc, char **argv) {
  if (argc < 2)
    return (write(2, "File name missing.\n", 19));
  if (argc > 2)
    return (write(2, "Too many arguments.\n", 20));
  read_file(argv[1]);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x2,-0x8(%rbp)
jge    115e <main+0x3e>
mov    $0x2,%edi
lea    0xeb4(%rip),%rsi
mov    $0x13,%edx
call   1030 <write@plt>
mov    %eax,-0x4(%rbp)
jmp    1193 <main+0x73>
cmpl   $0x2,-0x8(%rbp)
jle    1186 <main+0x66>
mov    $0x2,%edi
lea    0xea0(%rip),%rsi
mov    $0x14,%edx
call   1030 <write@plt>
mov    %eax,-0x4(%rbp)
jmp    1193 <main+0x73>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1040 <read_file@plt>
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
cmp    $0x1,%edi
jg     113b <main+0x1b>
lea    0xed4(%rip),%rsi
mov    $0x2,%edi
mov    $0x13,%edx
jmp    1030 <write@plt>
cmp    $0x2,%edi
jne    114e <main+0x2e>
push   %rax
mov    0x8(%rsi),%rdi
call   1040 <read_file@plt>
xor    %eax,%eax
pop    %rcx
ret
lea    0xebf(%rip),%rsi
mov    $0x2,%edi
mov    $0x14,%edx
jmp    1030 <write@plt>

LLVM IR (-O0):
@.str = [20 x i8] c"File name missing.\0A\00"
@.str.1 = [21 x i8] c"Too many arguments.\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%6 = load i32, i32* %4
%7 = icmp slt i32 %6, 2
br i1 %7, label %8, label %10
8: ; preds = %2
%9 = call i32 @write(i32 2, i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0), i32 19)
store i32 %9, i32* %3
br label %20
10: ; preds = %2
%11 = load i32, i32* %4
%12 = icmp sgt i32 %11, 2
br i1 %12, label %13, label %15
13: ; preds = %10
%14 = call i32 @write(i32 2, i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.1, i64 0, i64 0), i32 20)
store i32 %14, i32* %3
br label %20
15: ; preds = %10
%16 = load i8**, i8*** %5
%17 = getelementptr inbounds i8*, i8** %16, i64 1
%18 = load i8*, i8** %17
%19 = call i32 @read_file(i8* %18)
br label %20
20: ; preds = %15, %13, %8
%21 = load i32, i32* %3
ret i32 %21
}

LLVM IR (-O2):
@.str = [20 x i8] c"File name missing.\0A\00"
@.str.1 = [21 x i8] c"Too many arguments.\0A\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 @write(i32 2, i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str, i64 0, i64 0), i32 19)
br label %14
6: ; preds = %2
%7 = icmp eq i32 %0, 2
br i1 %7, label %10, label %8
8: ; preds = %6
%9 = tail call i32 @write(i32 2, i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.1, i64 0, i64 0), i32 20)
br label %14
10: ; preds = %6
%11 = getelementptr inbounds i8*, i8** %1, i64 1
%12 = load i8*, i8** %11
%13 = tail call i32 @read_file(i8* %12)
br label %14
14: ; preds = %10, %8, %4
%15 = phi i32 [ %5, %4 ], [ %9, %8 ], [ 0, %10 ]
ret i32 %15
}