#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 atoi(char *);
int /*<<< orphan*/ printf(char *, ...);
int main(int argv, char *argc[]) {
  if (argv != 2) {
    printf("Usage: temperature_ftoc 68");
    return -1;
  }
  int degrees_f = atoi(argc[1]);
  int degrees_c = (degrees_f - 32) / 1.8;
  printf("%dF is %dC\n", degrees_f, degrees_c);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x2,-0x8(%rbp)
je     115a <main+0x3a>
lea    0xec1(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0xffffffff,-0x4(%rbp)
jmp    11a2 <main+0x82>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1040 <atoi@plt>
mov    %eax,-0x14(%rbp)
mov    -0x14(%rbp),%eax
sub    $0x20,%eax
cvtsi2sd %eax,%xmm0
movsd  0xe84(%rip),%xmm1
divsd  %xmm1,%xmm0
cvttsd2si %xmm0,%eax
mov    %eax,-0x18(%rbp)
mov    -0x14(%rbp),%esi
mov    -0x18(%rbp),%edx
lea    0xe8f(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
cmp    $0x2,%edi
jne    1156 <main+0x36>
mov    0x8(%rsi),%rdi
call   1040 <atoi@plt>
lea    -0x20(%rax),%ecx
cvtsi2sd %ecx,%xmm0
divsd  0xec2(%rip),%xmm0
cvttsd2si %xmm0,%edx
lea    0xeda(%rip),%rdi
xor    %ebx,%ebx
mov    %eax,%esi
xor    %eax,%eax
call   1030 <printf@plt>
jmp    1169 <main+0x49>
lea    0xeab(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
mov    $0xffffffff,%ebx
mov    %ebx,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [27 x i8] c"Usage: temperature_ftoc 68\00"
@.str.1 = [12 x i8] c"%dF is %dC\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
%7 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%8 = load i32, i32* %4
%9 = icmp ne i32 %8, 2
br i1 %9, label %10, label %12
10: ; preds = %2
%11 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str, i64 0, i64 0))
store i32 -1, i32* %3
br label %25
12: ; preds = %2
%13 = load i8**, i8*** %5
%14 = getelementptr inbounds i8*, i8** %13, i64 1
%15 = load i8*, i8** %14
%16 = call i32 @atoi(i8* %15)
store i32 %16, i32* %6
%17 = load i32, i32* %6
%18 = sub nsw i32 %17, 32
%19 = sitofp i32 %18 to double
%20 = fdiv double %19, 1.800000e+00
%21 = fptosi double %20 to i32
store i32 %21, i32* %7
%22 = load i32, i32* %6
%23 = load i32, i32* %7
%24 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0), i32 %22, i32 %23)
store i32 0, i32* %3
br label %25
25: ; preds = %12, %10
%26 = load i32, i32* %3
ret i32 %26
}

LLVM IR (-O2):
@.str = [27 x i8] c"Usage: temperature_ftoc 68\00"
@.str.1 = [12 x i8] c"%dF is %dC\0A\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp eq i32 %0, 2
br i1 %3, label %6, label %4
4: ; preds = %2
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([27 x i8], [27 x i8]* @.str, i64 0, i64 0))
br label %15
6: ; preds = %2
%7 = getelementptr inbounds i8*, i8** %1, i64 1
%8 = load i8*, i8** %7
%9 = tail call i32 @atoi(i8* %8)
%10 = add nsw i32 %9, -32
%11 = sitofp i32 %10 to double
%12 = fdiv double %11, 1.800000e+00
%13 = fptosi double %12 to i32
%14 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0), i32 %9, i32 %13)
br label %15
15: ; preds = %6, %4
%16 = phi i32 [ -1, %4 ], [ 0, %6 ]
ret i32 %16
}