#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 */
scalar_t__ memcmp(char *, char *, size_t);
size_t strlen(char *);
int endswith(char *haystack, char *needle) {
  size_t len = strlen(haystack);
  size_t nlen = strlen(needle);
  if (nlen > len)
    return (0);
  size_t pos = len - nlen;
  if (memcmp(&haystack[pos], needle, nlen) != 0)
    return (0);
  return (1);
}


x86 assembly (clang, -O0):
<endswith>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x10(%rbp)
mov    %rsi,-0x18(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <strlen@plt>
mov    %rax,-0x20(%rbp)
mov    -0x18(%rbp),%rdi
call   1030 <strlen@plt>
mov    %rax,-0x28(%rbp)
mov    -0x28(%rbp),%rax
cmp    -0x20(%rbp),%rax
jbe    1164 <endswith+0x44>
movl   $0x0,-0x4(%rbp)
jmp    11a2 <endswith+0x82>
mov    -0x20(%rbp),%rax
sub    -0x28(%rbp),%rax
mov    %rax,-0x30(%rbp)
mov    -0x10(%rbp),%rdi
add    -0x30(%rbp),%rdi
mov    -0x18(%rbp),%rsi
mov    -0x28(%rbp),%rdx
call   1040 <memcmp@plt>
cmp    $0x0,%rax
je     119b <endswith+0x7b>
movl   $0x0,-0x4(%rbp)
jmp    11a2 <endswith+0x82>
movl   $0x1,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<endswith>:
push   %r15
push   %r14
push   %rbx
mov    %rsi,%r14
mov    %rdi,%r15
call   1030 <strlen@plt>
mov    %rax,%rbx
mov    %r14,%rdi
call   1030 <strlen@plt>
xor    %ecx,%ecx
sub    %rax,%rbx
jb     115b <endswith+0x3b>
add    %rbx,%r15
mov    %r15,%rdi
mov    %r14,%rsi
mov    %rax,%rdx
call   1040 <memcmp@plt>
xor    %ecx,%ecx
test   %rax,%rax
sete   %cl
mov    %ecx,%eax
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
define i32 @endswith(i8* %0, i8* %1) {
%3 = alloca i32
%4 = alloca i8*
%5 = alloca i8*
%6 = alloca i64
%7 = alloca i64
%8 = alloca i64
store i8* %0, i8** %4
store i8* %1, i8** %5
%9 = load i8*, i8** %4
%10 = call i64 @strlen(i8* %9)
store i64 %10, i64* %6
%11 = load i8*, i8** %5
%12 = call i64 @strlen(i8* %11)
store i64 %12, i64* %7
%13 = load i64, i64* %7
%14 = load i64, i64* %6
%15 = icmp ugt i64 %13, %14
br i1 %15, label %16, label %17
16: ; preds = %2
store i32 0, i32* %3
br label %30
17: ; preds = %2
%18 = load i64, i64* %6
%19 = load i64, i64* %7
%20 = sub i64 %18, %19
store i64 %20, i64* %8
%21 = load i8*, i8** %4
%22 = load i64, i64* %8
%23 = getelementptr inbounds i8, i8* %21, i64 %22
%24 = load i8*, i8** %5
%25 = load i64, i64* %7
%26 = call i64 @memcmp(i8* %23, i8* %24, i64 %25)
%27 = icmp ne i64 %26, 0
br i1 %27, label %28, label %29
28: ; preds = %17
store i32 0, i32* %3
br label %30
29: ; preds = %17
store i32 1, i32* %3
br label %30
30: ; preds = %29, %28, %16
%31 = load i32, i32* %3
ret i32 %31
}

LLVM IR (-O2):
define i32 @endswith(i8* %0, i8* %1) {
%3 = tail call i64 @strlen(i8* dereferenceable(1) %0)
%4 = tail call i64 @strlen(i8* dereferenceable(1) %1)
%5 = icmp ult i64 %3, %4
br i1 %5, label %12, label %6
6: ; preds = %2
%7 = sub i64 %3, %4
%8 = getelementptr inbounds i8, i8* %0, i64 %7
%9 = tail call i64 @memcmp(i8* %8, i8* %1, i64 %4)
%10 = icmp eq i64 %9, 0
%11 = zext i1 %10 to i32
br label %12
12: ; preds = %2, %6
%13 = phi i32 [ %11, %6 ], [ 0, %2 ]
ret i32 %13
}