#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 *, float *);
int main() {
  float a;
  scanf("%f", &a);
  if (a == 0) {
    printf("input is zero.");
  } else {
    if (a > 0) {
      printf("%.4f is positive.", a);
    } else {
      printf("%.4f is negative.", a);
    }
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
movss  -0x8(%rbp),%xmm0
xorps  %xmm1,%xmm1
ucomiss %xmm1,%xmm0
jne    1169 <main+0x49>
jp     1169 <main+0x49>
lea    0xea6(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    11b2 <main+0x92>
movss  -0x8(%rbp),%xmm0
xorps  %xmm1,%xmm1
ucomiss %xmm1,%xmm0
jbe    1196 <main+0x76>
movss  -0x8(%rbp),%xmm0
cvtss2sd %xmm0,%xmm0
lea    0xe88(%rip),%rdi
mov    $0x1,%al
call   1030 <printf@plt>
jmp    11ad <main+0x8d>
movss  -0x8(%rbp),%xmm0
cvtss2sd %xmm0,%xmm0
lea    0xe7e(%rip),%rdi
mov    $0x1,%al
call   1030 <printf@plt>
jmp    11b2 <main+0x92>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xed8(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1040 <scanf@plt>
movss  0x4(%rsp),%xmm0
xorps  %xmm1,%xmm1
ucomiss %xmm1,%xmm0
jne    1152 <main+0x32>
jp     1152 <main+0x32>
lea    0xeba(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
jmp    116f <main+0x4f>
cvtss2sd %xmm0,%xmm0
jbe    1161 <main+0x41>
lea    0xeb3(%rip),%rdi
jmp    1168 <main+0x48>
lea    0xebc(%rip),%rdi
mov    $0x1,%al
call   1030 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [3 x i8] c"%f\00"
@.str.1 = [15 x i8] c"input is zero.\00"
@.str.2 = [18 x i8] c"%.4f is positive.\00"
@.str.3 = [18 x i8] c"%.4f is negative.\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca float
store i32 0, i32* %1
%3 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), float* %2)
%4 = load float, float* %2
%5 = fcmp oeq float %4, 0.000000e+00
br i1 %5, label %6, label %8
6: ; preds = %0
%7 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str.1, i64 0, i64 0))
br label %20
8: ; preds = %0
%9 = load float, float* %2
%10 = fcmp ogt float %9, 0.000000e+00
br i1 %10, label %11, label %15
11: ; preds = %8
%12 = load float, float* %2
%13 = fpext float %12 to double
%14 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str.2, i64 0, i64 0), double %13)
br label %19
15: ; preds = %8
%16 = load float, float* %2
%17 = fpext float %16 to double
%18 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str.3, i64 0, i64 0), double %17)
br label %19
19: ; preds = %15, %11
br label %20
20: ; preds = %19, %6
ret i32 0
}

LLVM IR (-O2):
@.str = [3 x i8] c"%f\00"
@.str.1 = [15 x i8] c"input is zero.\00"
@.str.2 = [18 x i8] c"%.4f is positive.\00"
@.str.3 = [18 x i8] c"%.4f is negative.\00"
define i32 @main() {
%1 = alloca float
%2 = bitcast float* %1 to i8*
%3 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), float* %1)
%4 = load float, float* %1
%5 = fcmp oeq float %4, 0.000000e+00
br i1 %5, label %6, label %8
6: ; preds = %0
%7 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([15 x i8], [15 x i8]* @.str.1, i64 0, i64 0))
br label %15
8: ; preds = %0
%9 = fcmp ogt float %4, 0.000000e+00
%10 = fpext float %4 to double
br i1 %9, label %11, label %13
11: ; preds = %8
%12 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([18 x i8], [18 x i8]* @.str.2, i64 0, i64 0), double %10)
br label %15
13: ; preds = %8
%14 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([18 x i8], [18 x i8]* @.str.3, i64 0, i64 0), double %10)
br label %15
15: ; preds = %11, %13, %6
ret i32 0
}