#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 main(void) {
  float fahr, celsius;
  float lower, upper, step;
  lower = 0;
  upper = 300;
  step = 20;
  printf("F:   C:\n");
  printf("__________\n");
  for (fahr = upper; fahr >= lower; fahr = fahr - step) {
    celsius = (5.0 / 9.0) * (fahr - 32.0);
    printf("%3.0f %6.1f\n", fahr, celsius);
  }
}


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)
lea    0xed0(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xecb(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movss  -0x14(%rbp),%xmm0
movss  %xmm0,-0x8(%rbp)
movss  -0x8(%rbp),%xmm0
ucomiss -0x10(%rbp),%xmm0
jb     11d4 <main+0xc4>
movss  -0x8(%rbp),%xmm0
cvtss2sd %xmm0,%xmm1
movsd  0xe89(%rip),%xmm0
subsd  %xmm0,%xmm1
movsd  0xe75(%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    0xe74(%rip),%rdi
mov    $0x2,%al
call   1030 <printf@plt>
movss  -0x8(%rbp),%xmm0
subss  -0x18(%rbp),%xmm0
movss  %xmm0,-0x8(%rbp)
jmp    1167 <main+0x57>
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
lea    0xfd5(%rip),%rdi
call   1030 <puts@plt>
lea    0xfd1(%rip),%rdi
call   1030 <puts@plt>
lea    0xfb0(%rip),%rbx
movsd  0xeb8(%rip),%xmm0
movsd  0xeb8(%rip),%xmm1
mov    %rbx,%rdi
mov    $0x2,%al
call   1040 <printf@plt>
movsd  0xeae(%rip),%xmm0
movsd  0xeae(%rip),%xmm1
mov    %rbx,%rdi
mov    $0x2,%al
call   1040 <printf@plt>
movsd  0xea4(%rip),%xmm0
movsd  0xea4(%rip),%xmm1
mov    %rbx,%rdi
mov    $0x2,%al
call   1040 <printf@plt>
movsd  0xe9a(%rip),%xmm0
movsd  0xe9a(%rip),%xmm1
mov    %rbx,%rdi
mov    $0x2,%al
call   1040 <printf@plt>
movsd  0xe90(%rip),%xmm0
movsd  0xe90(%rip),%xmm1
mov    %rbx,%rdi
mov    $0x2,%al
call   1040 <printf@plt>
movsd  0xe86(%rip),%xmm0
movsd  0xe86(%rip),%xmm1
mov    %rbx,%rdi
mov    $0x2,%al
call   1040 <printf@plt>
movsd  0xe7c(%rip),%xmm0
movsd  0xe7c(%rip),%xmm1
mov    %rbx,%rdi
mov    $0x2,%al
call   1040 <printf@plt>
movsd  0xe72(%rip),%xmm0
movsd  0xe72(%rip),%xmm1
mov    %rbx,%rdi
mov    $0x2,%al
call   1040 <printf@plt>
movsd  0xe68(%rip),%xmm0
movsd  0xe68(%rip),%xmm1
mov    %rbx,%rdi
mov    $0x2,%al
call   1040 <printf@plt>
movsd  0xe5e(%rip),%xmm0
movsd  0xe5e(%rip),%xmm1
mov    %rbx,%rdi
mov    $0x2,%al
call   1040 <printf@plt>
movsd  0xe54(%rip),%xmm0
movsd  0xe54(%rip),%xmm1
mov    %rbx,%rdi
mov    $0x2,%al
call   1040 <printf@plt>
movsd  0xe4a(%rip),%xmm0
movsd  0xe4a(%rip),%xmm1
mov    %rbx,%rdi
mov    $0x2,%al
call   1040 <printf@plt>
movsd  0xe40(%rip),%xmm1
mov    %rbx,%rdi
movsd  0xdfd(%rip),%xmm0
mov    $0x2,%al
call   1040 <printf@plt>
movsd  0xe2e(%rip),%xmm0
movsd  0xe2e(%rip),%xmm1
mov    %rbx,%rdi
mov    $0x2,%al
call   1040 <printf@plt>
movsd  0xe24(%rip),%xmm0
movsd  0xe24(%rip),%xmm1
mov    %rbx,%rdi
mov    $0x2,%al
call   1040 <printf@plt>
movsd  0xe1a(%rip),%xmm1
xorps  %xmm0,%xmm0
mov    %rbx,%rdi
mov    $0x2,%al
call   1040 <printf@plt>
xor    %eax,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [9 x i8] c"F: C:\0A\00"
@.str.1 = [12 x i8] c"__________\0A\00"
@.str.2 = [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 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0))
%8 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0))
%9 = load float, float* %5
store float %9, float* %2
br label %10
10: ; preds = %25, %0
%11 = load float, float* %2
%12 = load float, float* %4
%13 = fcmp oge float %11, %12
br i1 %13, label %14, label %29
14: ; preds = %10
%15 = load float, float* %2
%16 = fpext float %15 to double
%17 = fsub double %16, 3.200000e+01
%18 = fmul double 0x3FE1C71C71C71C72, %17
%19 = fptrunc double %18 to float
store float %19, float* %3
%20 = load float, float* %2
%21 = fpext float %20 to double
%22 = load float, float* %3
%23 = fpext float %22 to double
%24 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), double %21, double %23)
br label %25
25: ; preds = %14
%26 = load float, float* %2
%27 = load float, float* %6
%28 = fsub float %26, %27
store float %28, float* %2
br label %10
29: ; preds = %10
%30 = load i32, i32* %1
ret i32 %30
}

LLVM IR (-O2):
@.str.2 = [13 x i8] c"%3.0f %6.1f\0A\00"
@str = [8 x i8] c"F: C:\00"
@str.3 = [11 x i8] c"__________\00"
define i32 @main() {
%1 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @str, i64 0, i64 0))
%2 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([11 x i8], [11 x i8]* @str.3, i64 0, i64 0))
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), double 3.000000e+02, double 0x40629C71C0000000)
%4 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), double 2.800000e+02, double 0x406138E380000000)
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), double 2.600000e+02, double 0x405FAAAAA0000000)
%6 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), double 2.400000e+02, double 0x405CE38E40000000)
%7 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), double 2.200000e+02, double 0x405A1C71C0000000)
%8 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), double 2.000000e+02, double 0x4057555560000000)
%9 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), double 1.800000e+02, double 0x40548E38E0000000)
%10 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), double 1.600000e+02, double 0x4051C71C80000000)
%11 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), double 1.400000e+02, double 6.000000e+01)
%12 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), double 1.200000e+02, double 0x404871C720000000)
%13 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), double 1.000000e+02, double 0x4042E38E40000000)
%14 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), double 8.000000e+01, double 0x403AAAAAA0000000)
%15 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), double 6.000000e+01, double 0x402F1C71C0000000)
%16 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), double 4.000000e+01, double 0x4011C71C80000000)
%17 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), double 2.000000e+01, double 0xC01AAAAAA0000000)
%18 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), double 0.000000e+00, double 0xC031C71C80000000)
ret i32 0
}