#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 f91(int);
int /*<<< orphan*/ printf(char *, int, int);
int /*<<< orphan*/ scanf(char *, int *);
int main() {
  int N = 0;
  while (1 == 1) {
    scanf("%d", &N);
    if (N == 0)
      break;
    printf("f91(%d) = %d\n", N, f91(N));
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x0,-0x8(%rbp)
lea    0xeb3(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1050 <scanf@plt>
cmpl   $0x0,-0x8(%rbp)
jne    1165 <main+0x35>
jmp    1189 <main+0x59>
mov    -0x8(%rbp),%eax
mov    %eax,-0xc(%rbp)
mov    -0x8(%rbp),%edi
call   1030 <f91@plt>
mov    -0xc(%rbp),%esi
mov    %eax,%edx
lea    0xe84(%rip),%rdi
call   1040 <printf@plt>
jmp    1146 <main+0x16>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
movl   $0x0,0x4(%rsp)
lea    0xeba(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1050 <scanf@plt>
mov    0x4(%rsp),%ebp
test   %ebp,%ebp
je     1196 <main+0x66>
lea    0xea4(%rip),%r14
lea    0xe9a(%rip),%r15
lea    0x4(%rsp),%rbx
nopl   0x0(%rax,%rax,1)
mov    %ebp,%edi
call   1030 <f91@plt>
mov    %r14,%rdi
mov    %ebp,%esi
mov    %eax,%edx
call   1040 <printf@plt>
mov    %r15,%rdi
mov    %rbx,%rsi
call   1050 <scanf@plt>
mov    0x4(%rsp),%ebp
test   %ebp,%ebp
jne    1170 <main+0x40>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@.str = [3 x i8] c"%d\00"
@.str.1 = [14 x i8] c"f91(%d) = %d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
store i32 0, i32* %1
store i32 0, i32* %2
br label %3
3: ; preds = %0, %8
%4 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %2)
%5 = load i32, i32* %2
%6 = icmp eq i32 %5, 0
br i1 %6, label %7, label %8
7: ; preds = %3
br label %13
8: ; preds = %3
%9 = load i32, i32* %2
%10 = load i32, i32* %2
%11 = call i32 @f91(i32 %10)
%12 = call i32 @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0), i32 %9, i32 %11)
br label %3
13: ; preds = %7
ret i32 0
}

LLVM IR (-O2):
@.str = [3 x i8] c"%d\00"
@.str.1 = [14 x i8] c"f91(%d) = %d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
store i32 0, i32* %1
%3 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %1)
%4 = load i32, i32* %1
%5 = icmp eq i32 %4, 0
br i1 %5, label %13, label %6
6: ; preds = %0, %6
%7 = phi i32 [ %11, %6 ], [ %4, %0 ]
%8 = call i32 @f91(i32 %7)
%9 = call i32 @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0), i32 %7, i32 %8)
%10 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %1)
%11 = load i32, i32* %1
%12 = icmp eq i32 %11, 0
br i1 %12, label %13, label %6
13: ; preds = %6, %0
ret i32 0
}