#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 */
char *gettext(char *);
int /*<<< orphan*/ printf(char *);
int /*<<< orphan*/ scanf(char *, double *);
double Resta(double a, double b) {
  printf(gettext("Enter a number: "));
  scanf("%lf", &a);
  printf("Enter a number: ");
  scanf("%lf", &b);
  return (a - b);
}


x86 assembly (clang, -O0):
<Resta>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movsd  %xmm0,-0x8(%rbp)
movsd  %xmm1,-0x10(%rbp)
lea    0xeb7(%rip),%rdi
call   1030 <gettext@plt>
mov    %rax,%rdi
call   1040 <printf@plt>
lea    0xeb4(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1050 <scanf@plt>
lea    0xe93(%rip),%rdi
call   1040 <printf@plt>
lea    0xe98(%rip),%rdi
lea    -0x10(%rbp),%rsi
call   1050 <scanf@plt>
movsd  -0x8(%rbp),%xmm0
subsd  -0x10(%rbp),%xmm0
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<Resta>:
push   %r14
push   %rbx
sub    $0x18,%rsp
movsd  %xmm0,0x10(%rsp)
movsd  %xmm1,0x8(%rsp)
lea    0xeb6(%rip),%r14
mov    %r14,%rdi
call   1030 <gettext@plt>
mov    %rax,%rdi
call   1040 <printf@plt>
lea    0xeb0(%rip),%rbx
lea    0x10(%rsp),%rsi
mov    %rbx,%rdi
call   1050 <scanf@plt>
mov    %r14,%rdi
call   1040 <printf@plt>
lea    0x8(%rsp),%rsi
mov    %rbx,%rdi
call   1050 <scanf@plt>
movsd  0x10(%rsp),%xmm0
subsd  0x8(%rsp),%xmm0
add    $0x18,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [17 x i8] c"Enter a number: \00"
@.str.1 = [4 x i8] c"%lf\00"
define double @Resta(double %0, double %1) {
%3 = alloca double
%4 = alloca double
store double %0, double* %3
store double %1, double* %4
%5 = call i8* @gettext(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str, i64 0, i64 0))
%6 = call i32 @printf(i8* %5)
%7 = call i32 @scanf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), double* %3)
%8 = call i32 @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str, i64 0, i64 0))
%9 = call i32 @scanf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), double* %4)
%10 = load double, double* %3
%11 = load double, double* %4
%12 = fsub double %10, %11
ret double %12
}

LLVM IR (-O2):
@.str = [17 x i8] c"Enter a number: \00"
@.str.1 = [4 x i8] c"%lf\00"
define double @Resta(double %0, double %1) {
%3 = alloca double
%4 = alloca double
store double %0, double* %3
store double %1, double* %4
%5 = tail call i8* @gettext(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str, i64 0, i64 0))
%6 = tail call i32 @printf(i8* dereferenceable(1) %5)
%7 = call i32 @scanf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), double* %3)
%8 = call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([17 x i8], [17 x i8]* @.str, i64 0, i64 0))
%9 = call i32 @scanf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), double* %4)
%10 = load double, double* %3
%11 = load double, double* %4
%12 = fsub double %10, %11
ret double %12
}