#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, celsius;
  float lower, upper, step;
  lower = 0;
  upper = 300;
  step = 20;
  celsius = upper;
  printf("%3s %6s\n", "celsius", "fahr");
  while (celsius >= lower) {
    fahr = (celsius + 32) / (5.0 / 9.0);
    printf("%3.0f %6.1f\n", celsius, fahr);
    celsius -= step;
  }
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
xorps  %xmm0,%xmm0
movss  %xmm0,-0x10(%rbp)
movss  0xed5(%rip),%xmm0
movss  %xmm0,-0x14(%rbp)
movss  0xec4(%rip),%xmm0
movss  %xmm0,-0x18(%rbp)
movss  -0x14(%rbp),%xmm0
movss  %xmm0,-0xc(%rbp)
lea    0xec6(%rip),%rdi
lea    0xec8(%rip),%rsi
lea    0xec9(%rip),%rdx
mov    $0x0,%al
call   1030 <printf@plt>
movss  -0xc(%rbp),%xmm0
ucomiss -0x10(%rbp),%xmm0
jb     11d4 <main+0xc4>
movss  0xe8a(%rip),%xmm0
addss  -0xc(%rbp),%xmm0
cvtss2sd %xmm0,%xmm0
movsd  0xe81(%rip),%xmm1
divsd  %xmm1,%xmm0
cvtsd2ss %xmm0,%xmm0
movss  %xmm0,-0x8(%rbp)
movss  -0xc(%rbp),%xmm0
cvtss2sd %xmm0,%xmm0
movss  -0x8(%rbp),%xmm1
cvtss2sd %xmm1,%xmm1
lea    0xe79(%rip),%rdi
mov    $0x2,%al
call   1030 <printf@plt>
movss  -0x18(%rbp),%xmm1
movss  -0xc(%rbp),%xmm0
subss  %xmm1,%xmm0
movss  %xmm0,-0xc(%rbp)
jmp    1167 <main+0x57>
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
lea    0xef8(%rip),%rsi
lea    0xef9(%rip),%rdx
xor    %eax,%eax
call   1030 <printf@plt>
mov    $0x140,%ebp
lea    0xeeb(%rip),%rbx
nopl   0x0(%rax,%rax,1)
add    $0xffffffec,%ebp
xorps  %xmm1,%xmm1
cvtsi2ss %ebp,%xmm1
xorps  %xmm0,%xmm0
cvtss2sd %xmm1,%xmm0
addss  0xea7(%rip),%xmm1
cvtss2sd %xmm1,%xmm1
divsd  0xea3(%rip),%xmm1
cvtsd2ss %xmm1,%xmm1
cvtss2sd %xmm1,%xmm1
mov    %rbx,%rdi
mov    $0x2,%al
call   1030 <printf@plt>
cmp    $0x13,%ebp
ja     1140 <main+0x30>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@.str = [9 x i8] c"%3s %6s\0A\00"
@.str.1 = [8 x i8] c"celsius\00"
@.str.2 = [5 x i8] c"fahr\00"
@.str.3 = [13 x i8] c"%3.0f %6.1f\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca float
%3 = alloca float
%4 = alloca float
%5 = alloca float
%6 = alloca float
store i32 0, i32* %1
store float 0.000000e+00, float* %4
store float 3.000000e+02, float* %5
store float 2.000000e+01, float* %6
%7 = load float, float* %5
store float %7, float* %3
%8 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.1, i64 0, i64 0), i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0))
br label %9
9: ; preds = %13, %0
%10 = load float, float* %3
%11 = load float, float* %4
%12 = fcmp oge float %10, %11
br i1 %12, label %13, label %27
13: ; preds = %9
%14 = load float, float* %3
%15 = fadd float %14, 3.200000e+01
%16 = fpext float %15 to double
%17 = fdiv double %16, 0x3FE1C71C71C71C72
%18 = fptrunc double %17 to float
store float %18, float* %2
%19 = load float, float* %3
%20 = fpext float %19 to double
%21 = load float, float* %2
%22 = fpext float %21 to double
%23 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.3, i64 0, i64 0), double %20, double %22)
%24 = load float, float* %6
%25 = load float, float* %3
%26 = fsub float %25, %24
store float %26, float* %3
br label %9
27: ; preds = %9
%28 = load i32, i32* %1
ret i32 %28
}

LLVM IR (-O2):
@.str = [9 x i8] c"%3s %6s\0A\00"
@.str.1 = [8 x i8] c"celsius\00"
@.str.2 = [5 x i8] c"fahr\00"
@.str.3 = [13 x i8] c"%3.0f %6.1f\0A\00"
define i32 @main() {
%1 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.1, i64 0, i64 0), i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0))
br label %2
2: ; preds = %0, %2
%3 = phi i32 [ 300, %0 ], [ %12, %2 ]
%4 = sitofp i32 %3 to float
%5 = fadd float %4, 3.200000e+01
%6 = fpext float %5 to double
%7 = fdiv double %6, 0x3FE1C71C71C71C72
%8 = fptrunc double %7 to float
%9 = fpext float %4 to double
%10 = fpext float %8 to double
%11 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.3, i64 0, i64 0), double %9, double %10)
%12 = add nsw i32 %3, -20
%13 = icmp ult i32 %3, 20
br i1 %13, label %14, label %2
14: ; preds = %2
ret i32 0
}