#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 EXIT_FAILURE;
int EXIT_SUCCESS;
int atoi(char *);
int /*<<< orphan*/ fibonacci(int, int, int /*<<< orphan*/);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *);
int /*<<< orphan*/ stderr;
int main(int argc, char *argv[]) {
  int n = 0;
  if (argc != 2) {
    fprintf(stderr, "fibonacci n\n"
                    "0 < n <= 46\n");
    return EXIT_FAILURE;
  }
  n = atoi(argv[1]);
  fibonacci(n, 1, 0);
  return EXIT_SUCCESS;
}


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)
movl   $0x0,-0x14(%rbp)
cmpl   $0x2,-0x8(%rbp)
je     117d <main+0x4d>
mov    0x2e82(%rip),%rax
mov    (%rax),%edi
lea    0xe99(%rip),%rsi
call   1030 <fprintf@plt>
mov    0x2e65(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x4(%rbp)
jmp    11a8 <main+0x78>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1050 <atoi@plt>
mov    %eax,-0x14(%rbp)
mov    -0x14(%rbp),%edi
mov    $0x1,%esi
xor    %edx,%edx
call   1040 <fibonacci@plt>
mov    0x2e2d(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
cmp    $0x2,%edi
jne    1156 <main+0x26>
mov    0x8(%rsi),%rdi
call   1050 <atoi@plt>
mov    %eax,%edi
mov    $0x1,%esi
xor    %edx,%edx
call   1040 <fibonacci@plt>
mov    0x2e7c(%rip),%rax
jmp    1172 <main+0x42>
mov    0x2e83(%rip),%rax
mov    (%rax),%edi
lea    0xe9a(%rip),%rsi
call   1030 <fprintf@plt>
mov    0x2e66(%rip),%rax
mov    (%rax),%eax
pop    %rcx
ret

LLVM IR (-O0):
@stderr = global i32 0
@.str = [25 x i8] c"fibonacci n\0A0 < n <= 46\0A\00"
@EXIT_FAILURE = global i32 0
@EXIT_SUCCESS = global i32 0
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
store i32 0, i32* %6
%7 = load i32, i32* %4
%8 = icmp ne i32 %7, 2
br i1 %8, label %9, label %13
9: ; preds = %2
%10 = load i32, i32* @stderr
%11 = call i32 @fprintf(i32 %10, i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str, i64 0, i64 0))
%12 = load i32, i32* @EXIT_FAILURE
store i32 %12, i32* %3
br label %21
13: ; preds = %2
%14 = load i8**, i8*** %5
%15 = getelementptr inbounds i8*, i8** %14, i64 1
%16 = load i8*, i8** %15
%17 = call i32 @atoi(i8* %16)
store i32 %17, i32* %6
%18 = load i32, i32* %6
%19 = call i32 @fibonacci(i32 %18, i32 1, i32 0)
%20 = load i32, i32* @EXIT_SUCCESS
store i32 %20, i32* %3
br label %21
21: ; preds = %13, %9
%22 = load i32, i32* %3
ret i32 %22
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [25 x i8] c"fibonacci n\0A0 < n <= 46\0A\00"
@EXIT_FAILURE = global i32 0
@EXIT_SUCCESS = global i32 0
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp eq i32 %0, 2
br i1 %3, label %7, label %4
4: ; preds = %2
%5 = load i32, i32* @stderr
%6 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str, i64 0, i64 0))
br label %12
7: ; preds = %2
%8 = getelementptr inbounds i8*, i8** %1, i64 1
%9 = load i8*, i8** %8
%10 = tail call i32 @atoi(i8* %9)
%11 = tail call i32 @fibonacci(i32 %10, i32 1, i32 0)
br label %12
12: ; preds = %7, %4
%13 = phi i32* [ @EXIT_FAILURE, %4 ], [ @EXIT_SUCCESS, %7 ]
%14 = load i32, i32* %13
ret i32 %14
}