#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 EXIT_SUCCESS;
int /*<<< orphan*/ errno;
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char *);
int /*<<< orphan*/ perror(char *);
int /*<<< orphan*/ stderr;
int /*<<< orphan*/ strtol(char *, int /*<<< orphan*/, int);
int main(int argc, char *argv[]) {
  if (argc < 2)
    fprintf(stderr, "Uso: %s <errno_number>\n", argv[0]);
  else {
    errno = strtol(argv[1], 0, 10);
    perror(argv[1]);
  }
  return (EXIT_SUCCESS);
}


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    1171 <main+0x41>
mov    0x2e89(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    (%rax),%rdx
lea    0xe99(%rip),%rsi
call   1030 <fprintf@plt>
jmp    119d <main+0x6d>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
xor    %esi,%esi
mov    $0xa,%edx
call   1040 <strtol@plt>
mov    %eax,%ecx
mov    0x2e4a(%rip),%rax
mov    %ecx,(%rax)
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1050 <perror@plt>
mov    0x2e2c(%rip),%rax
mov    (%rax),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
mov    %rsi,%rbx
cmp    $0x1,%edi
jg     115c <main+0x2c>
mov    0x2ea0(%rip),%rax
mov    (%rax),%edi
mov    (%rbx),%rdx
lea    0xeb4(%rip),%rsi
call   1030 <fprintf@plt>
mov    0x2e78(%rip),%rax
mov    (%rax),%eax
pop    %rbx
ret
mov    0x8(%rbx),%rdi
xor    %esi,%esi
mov    $0xa,%edx
call   1040 <strtol@plt>
mov    0x2e65(%rip),%rcx
mov    %eax,(%rcx)
mov    0x8(%rbx),%rdi
call   1050 <perror@plt>
jmp    1151 <main+0x21>

LLVM IR (-O0):
@stderr = global i32 0
@.str = [24 x i8] c"Uso: %s <errno_number>\0A\00"
@errno = global i32 0
@EXIT_SUCCESS = global i32 0
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 %14
8: ; preds = %2
%9 = load i32, i32* @stderr
%10 = load i8**, i8*** %5
%11 = getelementptr inbounds i8*, i8** %10, i64 0
%12 = load i8*, i8** %11
%13 = call i32 @fprintf(i32 %9, i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str, i64 0, i64 0), i8* %12)
br label %23
14: ; preds = %2
%15 = load i8**, i8*** %5
%16 = getelementptr inbounds i8*, i8** %15, i64 1
%17 = load i8*, i8** %16
%18 = call i32 @strtol(i8* %17, i32 0, i32 10)
store i32 %18, i32* @errno
%19 = load i8**, i8*** %5
%20 = getelementptr inbounds i8*, i8** %19, i64 1
%21 = load i8*, i8** %20
%22 = call i32 @perror(i8* %21)
br label %23
23: ; preds = %14, %8
%24 = load i32, i32* @EXIT_SUCCESS
ret i32 %24
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [24 x i8] c"Uso: %s <errno_number>\0A\00"
@errno = global i32 0
@EXIT_SUCCESS = global i32 0
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp slt i32 %0, 2
br i1 %3, label %4, label %8
4: ; preds = %2
%5 = load i32, i32* @stderr
%6 = load i8*, i8** %1
%7 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str, i64 0, i64 0), i8* %6)
br label %14
8: ; preds = %2
%9 = getelementptr inbounds i8*, i8** %1, i64 1
%10 = load i8*, i8** %9
%11 = tail call i32 @strtol(i8* %10, i32 0, i32 10)
store i32 %11, i32* @errno
%12 = load i8*, i8** %9
%13 = tail call i32 @perror(i8* %12)
br label %14
14: ; preds = %8, %4
%15 = load i32, i32* @EXIT_SUCCESS
ret i32 %15
}