#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 >= 0) {
    *y_ref = 1;
    while (*x_ref > *y_ref) {
      *y_ref = 2 * (*y_ref);
      *c = *c + 1;
    }
    *x_ref = *x_ref - 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
cmpl   $0x0,(%rax)
jl     11c4 <test_fun+0xb4>
mov    -0x18(%rbp),%rax
movl   $0x1,(%rax)
mov    -0x10(%rbp),%rax
mov    (%rax),%eax
mov    -0x18(%rbp),%rcx
cmp    (%rcx),%eax
jle    11b0 <test_fun+0xa0>
mov    -0x18(%rbp),%rax
mov    (%rax),%ecx
shl    $0x1,%ecx
mov    -0x18(%rbp),%rax
mov    %ecx,(%rax)
mov    -0x20(%rbp),%rax
mov    (%rax),%ecx
add    $0x1,%ecx
mov    -0x20(%rbp),%rax
mov    %ecx,(%rax)
jmp    117b <test_fun+0x6b>
mov    -0x10(%rbp),%rax
mov    (%rax),%ecx
sub    $0x1,%ecx
mov    -0x10(%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,%r14
mov    $0x4,%edi
call   1030 <alloca@plt>
mov    %rax,%rbx
mov    $0x4,%edi
call   1030 <alloca@plt>
mov    %ebp,(%r14)
mov    %r15d,(%rbx)
movl   $0x0,(%rax)
cmpl   $0x0,(%r14)
jns    116a <test_fun+0x5a>
xor    %eax,%eax
jmp    1194 <test_fun+0x84>
cs nopw 0x0(%rax,%rax,1)
lea    -0x1(%rcx),%edx
mov    %edx,(%r14)
test   %ecx,%ecx
jle    1192 <test_fun+0x82>
movl   $0x1,(%rbx)
mov    (%r14),%ecx
cmp    $0x2,%ecx
jl     1160 <test_fun+0x50>
mov    $0x1,%edx
nopl   (%rax)
add    %edx,%edx
mov    %edx,(%rbx)
addl   $0x1,(%rax)
mov    (%r14),%ecx
mov    (%rbx),%edx
cmp    %edx,%ecx
jg     1180 <test_fun+0x70>
jmp    1160 <test_fun+0x50>
mov    (%rax),%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 = %37, %2
%17 = load i32*, i32** %5
%18 = load i32, i32* %17
%19 = icmp sge i32 %18, 0
br i1 %19, label %20, label %42
20: ; preds = %16
%21 = load i32*, i32** %6
store i32 1, i32* %21
br label %22
22: ; preds = %28, %20
%23 = load i32*, i32** %5
%24 = load i32, i32* %23
%25 = load i32*, i32** %6
%26 = load i32, i32* %25
%27 = icmp sgt i32 %24, %26
br i1 %27, label %28, label %37
28: ; preds = %22
%29 = load i32*, i32** %6
%30 = load i32, i32* %29
%31 = mul nsw i32 2, %30
%32 = load i32*, i32** %6
store i32 %31, i32* %32
%33 = load i32*, i32** %7
%34 = load i32, i32* %33
%35 = add nsw i32 %34, 1
%36 = load i32*, i32** %7
store i32 %35, i32* %36
br label %22
37: ; preds = %22
%38 = load i32*, i32** %5
%39 = load i32, i32* %38
%40 = sub nsw i32 %39, 1
%41 = load i32*, i32** %5
store i32 %40, i32* %41
br label %16
42: ; preds = %16
%43 = load i32*, i32** %7
%44 = load i32, i32* %43
ret i32 %44
}

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 = icmp sgt i32 %6, -1
br i1 %7, label %8, label %25
8: ; preds = %2, %19
store i32 1, i32* %4
%9 = load i32, i32* %3
%10 = icmp sgt i32 %9, 1
br i1 %10, label %11, label %19
11: ; preds = %8, %11
%12 = phi i32 [ %17, %11 ], [ 1, %8 ]
%13 = shl nsw i32 %12, 1
store i32 %13, i32* %4
%14 = load i32, i32* %5
%15 = add nsw i32 %14, 1
store i32 %15, i32* %5
%16 = load i32, i32* %3
%17 = load i32, i32* %4
%18 = icmp sgt i32 %16, %17
br i1 %18, label %11, label %19
19: ; preds = %11, %8
%20 = phi i32 [ %9, %8 ], [ %16, %11 ]
%21 = add nsw i32 %20, -1
store i32 %21, i32* %3
%22 = icmp sgt i32 %20, 0
br i1 %22, label %8, label %23
23: ; preds = %19
%24 = load i32, i32* %5
br label %25
25: ; preds = %23, %2
%26 = phi i32 [ %24, %23 ], [ 0, %2 ]
ret i32 %26
}