#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 *, float, float);
main() {
  float fahr, celsius;
  int lower, upper, step;
  lower = 0;
  upper = 300;
  step = 20;
  printf("%3c %5c\n", 'C', 'F');
  for (fahr = upper; fahr >= 0; fahr = fahr - 20) {
    celsius = (5.0 / 9.0) * (fahr - 32.0);
    printf("%5.1f  %3.0f\n", celsius, fahr);
  }
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x0,-0x10(%rbp)
movl   $0x12c,-0x14(%rbp)
movl   $0x14,-0x18(%rbp)
lea    0xee5(%rip),%rdi
movss  0xebd(%rip),%xmm0
movss  0xeb9(%rip),%xmm1
call   1030 <printf@plt>
cvtsi2ssl -0x14(%rbp),%xmm0
movss  %xmm0,-0x8(%rbp)
movss  -0x8(%rbp),%xmm0
xorps  %xmm1,%xmm1
ucomiss %xmm1,%xmm0
jb     11c6 <main+0xb6>
movss  -0x8(%rbp),%xmm0
cvtss2sd %xmm0,%xmm1
movsd  0xe9c(%rip),%xmm0
subsd  %xmm0,%xmm1
movsd  0xe88(%rip),%xmm0
mulsd  %xmm1,%xmm0
cvtsd2ss %xmm0,%xmm0
movss  %xmm0,-0xc(%rbp)
movss  -0xc(%rbp),%xmm0
movss  -0x8(%rbp),%xmm1
lea    0xe83(%rip),%rdi
call   1030 <printf@plt>
movss  -0x8(%rbp),%xmm0
movss  0xe50(%rip),%xmm1
subss  %xmm1,%xmm0
movss  %xmm0,-0x8(%rbp)
jmp    115a <main+0x4a>
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %rbx
push   %rax
lea    0xefe(%rip),%rdi
movss  0xede(%rip),%xmm0
movss  0xeda(%rip),%xmm1
call   1030 <printf@plt>
mov    $0x140,%ebp
lea    0xee6(%rip),%rbx
nopl   0x0(%rax,%rax,1)
add    $0xffffffec,%ebp
xorps  %xmm1,%xmm1
cvtsi2ss %ebp,%xmm1
xorps  %xmm0,%xmm0
cvtss2sd %xmm1,%xmm0
addsd  0xeaf(%rip),%xmm0
mulsd  0xeaf(%rip),%xmm0
cvtsd2ss %xmm0,%xmm0
mov    %rbx,%rdi
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"%3c %5c\0A\00"
@.str.1 = [14 x i8] c"%5.1f %3.0f\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 0, i32* %4
store i32 300, i32* %5
store i32 20, i32* %6
%7 = call i32 @printf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0), float 6.700000e+01, float 7.000000e+01)
%8 = load i32, i32* %5
%9 = sitofp i32 %8 to float
store float %9, float* %2
br label %10
10: ; preds = %22, %0
%11 = load float, float* %2
%12 = fcmp oge float %11, 0.000000e+00
br i1 %12, label %13, label %25
13: ; preds = %10
%14 = load float, float* %2
%15 = fpext float %14 to double
%16 = fsub double %15, 3.200000e+01
%17 = fmul double 0x3FE1C71C71C71C72, %16
%18 = fptrunc double %17 to float
store float %18, float* %3
%19 = load float, float* %3
%20 = load float, float* %2
%21 = call i32 @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0), float %19, float %20)
br label %22
22: ; preds = %13
%23 = load float, float* %2
%24 = fsub float %23, 2.000000e+01
store float %24, float* %2
br label %10
25: ; preds = %10
%26 = load i32, i32* %1
ret i32 %26
}

LLVM IR (-O2):
@.str = [9 x i8] c"%3c %5c\0A\00"
@.str.1 = [14 x i8] c"%5.1f %3.0f\0A\00"
define i32 @main() {
%1 = tail call i32 @printf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0), float 6.700000e+01, float 7.000000e+01)
br label %2
2: ; preds = %0, %2
%3 = phi i32 [ 300, %0 ], [ %10, %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 = tail call i32 @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0), float %8, float %4)
%10 = add nsw i32 %3, -20
%11 = icmp ult i32 %3, 20
br i1 %11, label %12, label %2
12: ; preds = %2
ret i32 0
}