#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 *, ...);
main() {
  float fahr, cels;
  int lower, upper, step;
  lower = -40;
  upper = 300;
  step = 20;
  fahr = lower;
  printf("Fahrenfeit \t Celsius\n");
  while (fahr <= upper) {
    cels = (5.0 / 9.0) * (fahr - 32.0);
    printf("%3.0f \t\t %6.1f\n", fahr, cels);
    fahr = fahr + step;
  }
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0xffffffd8,-0x10(%rbp)
movl   $0x12c,-0x14(%rbp)
movl   $0x14,-0x18(%rbp)
cvtsi2ssl -0x10(%rbp),%xmm0
movss  %xmm0,-0x8(%rbp)
lea    0xecb(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movss  -0x8(%rbp),%xmm1
cvtsi2ssl -0x14(%rbp),%xmm0
ucomiss %xmm1,%xmm0
jb     11c1 <main+0xb1>
movss  -0x8(%rbp),%xmm0
cvtss2sd %xmm0,%xmm1
movsd  0xe98(%rip),%xmm0
subsd  %xmm0,%xmm1
movsd  0xe84(%rip),%xmm0
mulsd  %xmm1,%xmm0
cvtsd2ss %xmm0,%xmm0
movss  %xmm0,-0xc(%rbp)
movss  -0x8(%rbp),%xmm0
cvtss2sd %xmm0,%xmm0
movss  -0xc(%rbp),%xmm1
cvtss2sd %xmm1,%xmm1
lea    0xe84(%rip),%rdi
mov    $0x2,%al
call   1030 <printf@plt>
movss  -0x8(%rbp),%xmm0
cvtsi2ssl -0x18(%rbp),%xmm1
addss  %xmm1,%xmm0
movss  %xmm0,-0x8(%rbp)
jmp    114c <main+0x3c>
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %rbx
push   %rax
lea    0xef6(%rip),%rdi
call   1030 <puts@plt>
mov    $0xffffffc4,%ebp
lea    0xed5(%rip),%rbx
nopl   0x0(%rax,%rax,1)
add    $0x14,%ebp
xorps  %xmm0,%xmm0
cvtsi2ss %ebp,%xmm0
cvtss2sd %xmm0,%xmm0
movaps %xmm0,%xmm1
addsd  0xea7(%rip),%xmm1
mulsd  0xea7(%rip),%xmm1
cvtsd2ss %xmm1,%xmm1
cvtss2sd %xmm1,%xmm1
mov    %rbx,%rdi
mov    $0x2,%al
call   1040 <printf@plt>
cmp    $0x119,%ebp
jl     1140 <main+0x20>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@.str = [22 x i8] c"Fahrenfeit \09 Celsius\0A\00"
@.str.1 = [16 x i8] c"%3.0f \09\09 %6.1f\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca float
%3 = alloca float
%4 = alloca i32
%5 = alloca i32
%6 = alloca i32
store i32 0, i32* %1
store i32 -40, i32* %4
store i32 300, i32* %5
store i32 20, i32* %6
%7 = load i32, i32* %4
%8 = sitofp i32 %7 to float
store float %8, float* %2
%9 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str, i64 0, i64 0))
br label %10
10: ; preds = %15, %0
%11 = load float, float* %2
%12 = load i32, i32* %5
%13 = sitofp i32 %12 to float
%14 = fcmp ole float %11, %13
br i1 %14, label %15, label %30
15: ; preds = %10
%16 = load float, float* %2
%17 = fpext float %16 to double
%18 = fsub double %17, 3.200000e+01
%19 = fmul double 0x3FE1C71C71C71C72, %18
%20 = fptrunc double %19 to float
store float %20, float* %3
%21 = load float, float* %2
%22 = fpext float %21 to double
%23 = load float, float* %3
%24 = fpext float %23 to double
%25 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.1, i64 0, i64 0), double %22, double %24)
%26 = load float, float* %2
%27 = load i32, i32* %6
%28 = sitofp i32 %27 to float
%29 = fadd float %26, %28
store float %29, float* %2
br label %10
30: ; preds = %10
%31 = load i32, i32* %1
ret i32 %31
}

LLVM IR (-O2):
@.str.1 = [16 x i8] c"%3.0f \09\09 %6.1f\0A\00"
@str = [21 x i8] c"Fahrenfeit \09 Celsius\00"
define i32 @main() {
%1 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([21 x i8], [21 x i8]* @str, i64 0, i64 0))
br label %2
2: ; preds = %0, %2
%3 = phi i32 [ -40, %0 ], [ %11, %2 ]
%4 = sitofp i32 %3 to float
%5 = fpext float %4 to double
%6 = fadd double %5, -3.200000e+01
%7 = fmul double %6, 0x3FE1C71C71C71C72
%8 = fptrunc double %7 to float
%9 = fpext float %8 to double
%10 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([16 x i8], [16 x i8]* @.str.1, i64 0, i64 0), double %5, double %9)
%11 = add nsw i32 %3, 20
%12 = icmp sgt i32 %3, 280
br i1 %12, label %13, label %2
13: ; preds = %2
ret i32 0
}