#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 */
typedef scalar_t__ int64_t;

/* Variables and functions */
scalar_t__ strlen(char const *);
scalar_t__ strncmp(char const *, char const *, scalar_t__);
bool string_ends_with(const char *str, const char *pattern) {
  int64_t str_len = strlen(str);
  int64_t pattern_len = strlen(pattern);
  if (str_len < pattern_len)
    return false;
  return strncmp(str + (str_len - pattern_len), pattern, pattern_len) == 0;
}


x86 assembly (clang, -O0):
<string_ends_with>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x10(%rbp)
mov    %rsi,-0x18(%rbp)
mov    -0x10(%rbp),%rdi
call   1040 <strlen@plt>
mov    %rax,-0x20(%rbp)
mov    -0x18(%rbp),%rdi
call   1040 <strlen@plt>
mov    %rax,-0x28(%rbp)
mov    -0x20(%rbp),%rax
cmp    -0x28(%rbp),%rax
jge    1164 <string_ends_with+0x44>
movl   $0x0,-0x4(%rbp)
jmp    118f <string_ends_with+0x6f>
mov    -0x10(%rbp),%rdi
mov    -0x20(%rbp),%rax
sub    -0x28(%rbp),%rax
add    %rax,%rdi
mov    -0x18(%rbp),%rsi
mov    -0x28(%rbp),%rdx
call   1030 <strncmp@plt>
cmp    $0x0,%rax
sete   %al
and    $0x1,%al
movzbl %al,%eax
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x30,%rsp
pop    %rbp
ret

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

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

LLVM IR (-O2):
define i32 @string_ends_with(i8* %0, i8* %1) {
%3 = tail call i64 @strlen(i8* dereferenceable(1) %0)
%4 = tail call i64 @strlen(i8* dereferenceable(1) %1)
%5 = icmp slt i64 %3, %4
br i1 %5, label %12, label %6
6: ; preds = %2
%7 = sub nsw i64 %3, %4
%8 = getelementptr inbounds i8, i8* %0, i64 %7
%9 = tail call i64 @strncmp(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
}