#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 *);
float toCelsius(float);
int main() {
  float f = 0;
  printf("Fahrenheit: ");
  scanf("%f", &f);
  float c = toCelsius(f);
  printf("%5.2f°F equals to %5.2f°C\n", f, c);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
xorps  %xmm0,%xmm0
movss  %xmm0,-0x8(%rbp)
lea    0xeb2(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xeb1(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1050 <scanf@plt>
movss  -0x8(%rbp),%xmm0
call   1040 <toCelsius@plt>
movss  %xmm0,-0xc(%rbp)
movss  -0x8(%rbp),%xmm0
cvtss2sd %xmm0,%xmm0
movss  -0xc(%rbp),%xmm1
cvtss2sd %xmm1,%xmm1
lea    0xe83(%rip),%rdi
mov    $0x2,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
movl   $0x0,0x4(%rsp)
lea    0xec0(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xebf(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1050 <scanf@plt>
movss  0x4(%rsp),%xmm0
call   1040 <toCelsius@plt>
movss  0x4(%rsp),%xmm1
cvtss2sd %xmm1,%xmm2
xorps  %xmm1,%xmm1
cvtss2sd %xmm0,%xmm1
lea    0xe95(%rip),%rdi
movaps %xmm2,%xmm0
mov    $0x2,%al
call   1030 <printf@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [13 x i8] c"Fahrenheit: \00"
@.str.1 = [3 x i8] c"%f\00"
@.str.2 = [29 x i8] c"%5.2f\C2\B0F equals to %5.2f\C2\B0C\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca float
%3 = alloca float
store i32 0, i32* %1
store float 0.000000e+00, float* %2
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i64 0, i64 0))
%5 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), float* %2)
%6 = load float, float* %2
%7 = call float @toCelsius(float %6)
store float %7, float* %3
%8 = load float, float* %2
%9 = fpext float %8 to double
%10 = load float, float* %3
%11 = fpext float %10 to double
%12 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str.2, i64 0, i64 0), double %9, double %11)
ret i32 0
}

LLVM IR (-O2):
@.str = [13 x i8] c"Fahrenheit: \00"
@.str.1 = [3 x i8] c"%f\00"
@.str.2 = [29 x i8] c"%5.2f\C2\B0F equals to %5.2f\C2\B0C\0A\00"
define i32 @main() {
%1 = alloca float
%2 = bitcast float* %1 to i8*
store float 0.000000e+00, float* %1
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 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), float* %1)
%5 = load float, float* %1
%6 = call float @toCelsius(float %5)
%7 = load float, float* %1
%8 = fpext float %7 to double
%9 = fpext float %6 to double
%10 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([29 x i8], [29 x i8]* @.str.2, i64 0, i64 0), double %8, double %9)
ret i32 0
}