#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 /*<<< orphan*/ scanf(char *, int *);
void main(void) {
  int i, n, s = 1;
  printf("Please enter s:");
  scanf("%d", &n);
  for (i = 1; s < n; i++)
    s = s * i;
  printf("n=%d\n", i - 1);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x1,-0xc(%rbp)
lea    0xeca(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xecc(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
movl   $0x1,-0x4(%rbp)
mov    -0xc(%rbp),%eax
cmp    -0x8(%rbp),%eax
jge    1178 <main+0x58>
mov    -0xc(%rbp),%eax
imul   -0x4(%rbp),%eax
mov    %eax,-0xc(%rbp)
mov    -0x4(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x4(%rbp)
jmp    1154 <main+0x34>
mov    -0x4(%rbp),%esi
sub    $0x1,%esi
lea    0xe8e(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x10,%rsp
lea    0xed4(%rip),%rdi
xor    %ebx,%ebx
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xed4(%rip),%rdi
lea    0xc(%rsp),%rsi
call   1040 <scanf@plt>
mov    0xc(%rsp),%eax
cmp    $0x2,%eax
jl     116a <main+0x4a>
mov    $0x1,%ecx
xor    %ebx,%ebx
cs nopw 0x0(%rax,%rax,1)
add    $0x1,%ebx
imul   %ebx,%ecx
cmp    %eax,%ecx
jl     1160 <main+0x40>
lea    0xea2(%rip),%rdi
mov    %ebx,%esi
xor    %eax,%eax
call   1030 <printf@plt>
add    $0x10,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [16 x i8] c"Please enter s:\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [6 x i8] c"n=%d\0A\00"
define void @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
store i32 1, i32* %3
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str, i64 0, i64 0))
%5 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
store i32 1, i32* %1
br label %6
6: ; preds = %14, %0
%7 = load i32, i32* %3
%8 = load i32, i32* %2
%9 = icmp slt i32 %7, %8
br i1 %9, label %10, label %17
10: ; preds = %6
%11 = load i32, i32* %3
%12 = load i32, i32* %1
%13 = mul nsw i32 %11, %12
store i32 %13, i32* %3
br label %14
14: ; preds = %10
%15 = load i32, i32* %1
%16 = add nsw i32 %15, 1
store i32 %16, i32* %1
br label %6
17: ; preds = %6
%18 = load i32, i32* %1
%19 = sub nsw i32 %18, 1
%20 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.2, i64 0, i64 0), i32 %19)
ret void
}

LLVM IR (-O2):
@.str = [16 x i8] c"Please enter s:\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [6 x i8] c"n=%d\0A\00"
define void @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([16 x i8], [16 x i8]* @.str, i64 0, i64 0))
%4 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %1)
%5 = load i32, i32* %1
%6 = icmp sgt i32 %5, 1
br i1 %6, label %7, label %13
7: ; preds = %0, %7
%8 = phi i32 [ %10, %7 ], [ 1, %0 ]
%9 = phi i32 [ %11, %7 ], [ 1, %0 ]
%10 = mul nsw i32 %8, %9
%11 = add nuw nsw i32 %9, 1
%12 = icmp slt i32 %10, %5
br i1 %12, label %7, label %13
13: ; preds = %7, %0
%14 = phi i32 [ 0, %0 ], [ %9, %7 ]
%15 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([6 x i8], [6 x i8]* @.str.2, i64 0, i64 0), i32 %14)
ret void
}