#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*/ printf(char *);
int /*<<< orphan*/ scanf(char *, int *);
int main(void) {
  int a;
  printf("introduce un numero entero: ");
  scanf("%d", &a);
  if (a > 0) {
    printf("El valor de a es positivo.\n");
  } else if (a == 0) {
    printf("El valor de a es nulo.\n");
  } else if (a < 0) {
    printf("El valor de a es negativo.\n");
  } else {
    printf("Es imposible mostrar este mensaje.\n");
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
call   1030 <printf@plt>
lea    0xedb(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
cmpl   $0x0,-0x8(%rbp)
jle    1166 <main+0x46>
lea    0xec4(%rip),%rdi
call   1030 <printf@plt>
jmp    11b2 <main+0x92>
cmpl   $0x0,-0x8(%rbp)
jne    1181 <main+0x61>
lea    0xec5(%rip),%rdi
call   1030 <printf@plt>
jmp    11ad <main+0x8d>
cmpl   $0x0,-0x8(%rbp)
jge    119c <main+0x7c>
lea    0xec2(%rip),%rdi
call   1030 <printf@plt>
jmp    11a8 <main+0x88>
lea    0xecd(%rip),%rdi
call   1030 <printf@plt>
jmp    11ad <main+0x8d>
jmp    11b2 <main+0x92>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xec8(%rip),%rdi
call   1040 <printf@plt>
lea    0xed9(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1050 <scanf@plt>
cmpl   $0x0,0x4(%rsp)
lea    0xee1(%rip),%rax
lea    0xebf(%rip),%rcx
cmove  %rax,%rcx
lea    0xee6(%rip),%rdi
cmovle %rcx,%rdi
call   1030 <puts@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [29 x i8] c"introduce un numero entero: \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [28 x i8] c"El valor de a es positivo.\0A\00"
@.str.3 = [24 x i8] c"El valor de a es nulo.\0A\00"
@.str.4 = [28 x i8] c"El valor de a es negativo.\0A\00"
@.str.5 = [36 x i8] c"Es imposible mostrar este mensaje.\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
store i32 0, i32* %1
%3 = call i32 @printf(i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str, i64 0, i64 0))
%4 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
%5 = load i32, i32* %2
%6 = icmp sgt i32 %5, 0
br i1 %6, label %7, label %9
7: ; preds = %0
%8 = call i32 @printf(i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.2, i64 0, i64 0))
br label %23
9: ; preds = %0
%10 = load i32, i32* %2
%11 = icmp eq i32 %10, 0
br i1 %11, label %12, label %14
12: ; preds = %9
%13 = call i32 @printf(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.3, i64 0, i64 0))
br label %22
14: ; preds = %9
%15 = load i32, i32* %2
%16 = icmp slt i32 %15, 0
br i1 %16, label %17, label %19
17: ; preds = %14
%18 = call i32 @printf(i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.4, i64 0, i64 0))
br label %21
19: ; preds = %14
%20 = call i32 @printf(i8* getelementptr inbounds ([36 x i8], [36 x i8]* @.str.5, i64 0, i64 0))
br label %21
21: ; preds = %19, %17
br label %22
22: ; preds = %21, %12
br label %23
23: ; preds = %22, %7
ret i32 0
}

LLVM IR (-O2):
@.str = [29 x i8] c"introduce un numero entero: \00"
@.str.1 = [3 x i8] c"%d\00"
@str = [27 x i8] c"El valor de a es negativo.\00"
@str.6 = [23 x i8] c"El valor de a es nulo.\00"
@str.7 = [27 x i8] c"El valor de a es positivo.\00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([29 x i8], [29 x i8]* @.str, i64 0, i64 0))
%4 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %1)
%5 = load i32, i32* %1
%6 = icmp sgt i32 %5, 0
%7 = icmp eq i32 %5, 0
%8 = select i1 %7, i8* getelementptr inbounds ([23 x i8], [23 x i8]* @str.6, i64 0, i64 0), i8* getelementptr inbounds ([27 x i8], [27 x i8]* @str, i64 0, i64 0)
%9 = select i1 %6, i8* getelementptr inbounds ([27 x i8], [27 x i8]* @str.7, i64 0, i64 0), i8* %8
%10 = call i32 @puts(i8* dereferenceable(1) %9)
ret i32 0
}