#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 *, double *, double *);
int subtract() {
  double num1, num2, sub;
  printf("Subtraction!\n please input two numbers:");
  scanf("%lf %lf", &num1, &num2);
  sub = num1 - num2;
  printf("%lf - %lf = %lf\n", num1, num2, sub);
  printf("===========================================\n");
  return 0;
}


x86 assembly (clang, -O0):
<subtract>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
lea    0xed1(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xeeb(%rip),%rdi
lea    -0x8(%rbp),%rsi
lea    -0x10(%rbp),%rdx
call   1040 <scanf@plt>
movsd  -0x8(%rbp),%xmm0
subsd  -0x10(%rbp),%xmm0
movsd  %xmm0,-0x18(%rbp)
movsd  -0x8(%rbp),%xmm0
movsd  -0x10(%rbp),%xmm1
movsd  -0x18(%rbp),%xmm2
lea    0xec1(%rip),%rdi
mov    $0x3,%al
call   1030 <printf@plt>
lea    0xec4(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<subtract>:
sub    $0x18,%rsp
lea    0xec5(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xedf(%rip),%rdi
lea    0x10(%rsp),%rsi
lea    0x8(%rsp),%rdx
call   1050 <scanf@plt>
movsd  0x10(%rsp),%xmm0
movsd  0x8(%rsp),%xmm1
movapd %xmm0,%xmm2
subsd  %xmm1,%xmm2
lea    0xebd(%rip),%rdi
mov    $0x3,%al
call   1040 <printf@plt>
lea    0xec0(%rip),%rdi
call   1030 <puts@plt>
xor    %eax,%eax
add    $0x18,%rsp
ret

LLVM IR (-O0):
@.str = [40 x i8] c"Subtraction!\0A please input two numbers:\00"
@.str.1 = [8 x i8] c"%lf %lf\00"
@.str.2 = [17 x i8] c"%lf - %lf = %lf\0A\00"
@.str.3 = [45 x i8] c"===========================================\0A\00"
define i32 @subtract() {
%1 = alloca double
%2 = alloca double
%3 = alloca double
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([40 x i8], [40 x i8]* @.str, i64 0, i64 0))
%5 = call i32 @scanf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.1, i64 0, i64 0), double* %1, double* %2)
%6 = load double, double* %1
%7 = load double, double* %2
%8 = fsub double %6, %7
store double %8, double* %3
%9 = load double, double* %1
%10 = load double, double* %2
%11 = load double, double* %3
%12 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.2, i64 0, i64 0), double %9, double %10, double %11)
%13 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([45 x i8], [45 x i8]* @.str.3, i64 0, i64 0))
ret i32 0
}

LLVM IR (-O2):
@.str = [40 x i8] c"Subtraction!\0A please input two numbers:\00"
@.str.1 = [8 x i8] c"%lf %lf\00"
@.str.2 = [17 x i8] c"%lf - %lf = %lf\0A\00"
@str = [44 x i8] c"===========================================\00"
define i32 @subtract() {
%1 = alloca double
%2 = alloca double
%3 = bitcast double* %1 to i8*
%4 = bitcast double* %2 to i8*
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([40 x i8], [40 x i8]* @.str, i64 0, i64 0))
%6 = call i32 @scanf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.1, i64 0, i64 0), double* %1, double* %2)
%7 = load double, double* %1
%8 = load double, double* %2
%9 = fsub double %7, %8
%10 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([17 x i8], [17 x i8]* @.str.2, i64 0, i64 0), double %7, double %8, double %9)
%11 = call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([44 x i8], [44 x i8]* @str, i64 0, i64 0))
ret i32 0
}