#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 *alloca(int);
int test_fun(int x, int y) {
  int *x_ref = alloca(sizeof(int));
  int *y_ref = alloca(sizeof(int));
  int *c = alloca(sizeof(int));
  *x_ref = x;
  *y_ref = y;
  *c = 0;
  while (*x_ref > *y_ref) {
    *x_ref = *x_ref - 1;
    *c = *c + 1;
  }
  return *c;
}


x86 assembly (clang, -O0):
<test_fun>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %edi,-0x4(%rbp)
mov    %esi,-0x8(%rbp)
mov    $0x4,%edi
call   1030 <alloca@plt>
mov    %rax,-0x10(%rbp)
mov    $0x4,%edi
call   1030 <alloca@plt>
mov    %rax,-0x18(%rbp)
mov    $0x4,%edi
call   1030 <alloca@plt>
mov    %rax,-0x20(%rbp)
mov    -0x4(%rbp),%ecx
mov    -0x10(%rbp),%rax
mov    %ecx,(%rax)
mov    -0x8(%rbp),%ecx
mov    -0x18(%rbp),%rax
mov    %ecx,(%rax)
mov    -0x20(%rbp),%rax
movl   $0x0,(%rax)
mov    -0x10(%rbp),%rax
mov    (%rax),%eax
mov    -0x18(%rbp),%rcx
cmp    (%rcx),%eax
jle    1199 <test_fun+0x89>
mov    -0x10(%rbp),%rax
mov    (%rax),%ecx
sub    $0x1,%ecx
mov    -0x10(%rbp),%rax
mov    %ecx,(%rax)
mov    -0x20(%rbp),%rax
mov    (%rax),%ecx
add    $0x1,%ecx
mov    -0x20(%rbp),%rax
mov    %ecx,(%rax)
jmp    1164 <test_fun+0x54>
mov    -0x20(%rbp),%rax
mov    (%rax),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<test_fun>:
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
mov    %esi,%r15d
mov    %edi,%ebp
mov    $0x4,%edi
call   1030 <alloca@plt>
mov    %rax,%rbx
mov    $0x4,%edi
call   1030 <alloca@plt>
mov    %rax,%r14
mov    $0x4,%edi
call   1030 <alloca@plt>
mov    %ebp,(%rbx)
mov    %r15d,(%r14)
movl   $0x0,(%rax)
mov    (%rbx),%edx
xor    %ecx,%ecx
cmp    (%r14),%edx
jle    1173 <test_fun+0x63>
cs nopw 0x0(%rax,%rax,1)
xchg   %ax,%ax
add    $0xffffffff,%edx
mov    %edx,(%rbx)
mov    (%rax),%ecx
add    $0x1,%ecx
mov    %ecx,(%rax)
mov    (%rbx),%edx
cmp    (%r14),%edx
jg     1160 <test_fun+0x50>
mov    %ecx,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
define i32 @test_fun(i32 %0, i32 %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i32*
%6 = alloca i32*
%7 = alloca i32*
store i32 %0, i32* %3
store i32 %1, i32* %4
%8 = call i32* @alloca(i32 4)
store i32* %8, i32** %5
%9 = call i32* @alloca(i32 4)
store i32* %9, i32** %6
%10 = call i32* @alloca(i32 4)
store i32* %10, i32** %7
%11 = load i32, i32* %3
%12 = load i32*, i32** %5
store i32 %11, i32* %12
%13 = load i32, i32* %4
%14 = load i32*, i32** %6
store i32 %13, i32* %14
%15 = load i32*, i32** %7
store i32 0, i32* %15
br label %16
16: ; preds = %22, %2
%17 = load i32*, i32** %5
%18 = load i32, i32* %17
%19 = load i32*, i32** %6
%20 = load i32, i32* %19
%21 = icmp sgt i32 %18, %20
br i1 %21, label %22, label %31
22: ; preds = %16
%23 = load i32*, i32** %5
%24 = load i32, i32* %23
%25 = sub nsw i32 %24, 1
%26 = load i32*, i32** %5
store i32 %25, i32* %26
%27 = load i32*, i32** %7
%28 = load i32, i32* %27
%29 = add nsw i32 %28, 1
%30 = load i32*, i32** %7
store i32 %29, i32* %30
br label %16
31: ; preds = %16
%32 = load i32*, i32** %7
%33 = load i32, i32* %32
ret i32 %33
}

LLVM IR (-O2):
define i32 @test_fun(i32 %0, i32 %1) {
%3 = tail call i32* @alloca(i32 4)
%4 = tail call i32* @alloca(i32 4)
%5 = tail call i32* @alloca(i32 4)
store i32 %0, i32* %3
store i32 %1, i32* %4
store i32 0, i32* %5
%6 = load i32, i32* %3
%7 = load i32, i32* %4
%8 = icmp sgt i32 %6, %7
br i1 %8, label %9, label %17
9: ; preds = %2, %9
%10 = phi i32 [ %14, %9 ], [ %6, %2 ]
%11 = add nsw i32 %10, -1
store i32 %11, i32* %3
%12 = load i32, i32* %5
%13 = add nsw i32 %12, 1
store i32 %13, i32* %5
%14 = load i32, i32* %3
%15 = load i32, i32* %4
%16 = icmp sgt i32 %14, %15
br i1 %16, label %9, label %17
17: ; preds = %9, %2
%18 = phi i32 [ 0, %2 ], [ %13, %9 ]
ret i32 %18
}