#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 strcmp(char *, char *);
size_t strlen(char *);
int compare_string_ending_equality(char *string, char *ending) {
  size_t stringlen = strlen(string);
  size_t endinglen = strlen(ending);
  if (stringlen < endinglen)
    return -2;
  string += stringlen - endinglen;
  return strcmp(string, ending);
}


x86 assembly (clang, -O0):
<compare_string_ending_equality>:
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    -0x20(%rbp),%rax
cmp    -0x28(%rbp),%rax
jae    1164 <compare_string_ending_equality+0x44>
movl   $0xfffffffe,-0x4(%rbp)
jmp    1184 <compare_string_ending_equality+0x64>
mov    -0x20(%rbp),%rax
sub    -0x28(%rbp),%rax
add    -0x10(%rbp),%rax
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
mov    -0x18(%rbp),%rsi
call   1040 <strcmp@plt>
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<compare_string_ending_equality>:
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>
sub    %rax,%rbx
jae    114b <compare_string_ending_equality+0x2b>
mov    $0xfffffffe,%eax
pop    %rbx
pop    %r14
pop    %r15
ret
add    %rbx,%r15
mov    %r15,%rdi
mov    %r14,%rsi
pop    %rbx
pop    %r14
pop    %r15
jmp    1040 <strcmp@plt>

LLVM IR (-O0):
define i32 @compare_string_ending_equality(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 ult i64 %12, %13
br i1 %14, label %15, label %16
15: ; preds = %2
store i32 -2, i32* %3
br label %25
16: ; preds = %2
%17 = load i64, i64* %6
%18 = load i64, i64* %7
%19 = sub i64 %17, %18
%20 = load i8*, i8** %4
%21 = getelementptr inbounds i8, i8* %20, i64 %19
store i8* %21, i8** %4
%22 = load i8*, i8** %4
%23 = load i8*, i8** %5
%24 = call i32 @strcmp(i8* %22, i8* %23)
store i32 %24, i32* %3
br label %25
25: ; preds = %16, %15
%26 = load i32, i32* %3
ret i32 %26
}

LLVM IR (-O2):
define i32 @compare_string_ending_equality(i8* nocapture %0, i8* nocapture %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 %10, label %6
6: ; preds = %2
%7 = sub i64 %3, %4
%8 = getelementptr inbounds i8, i8* %0, i64 %7
%9 = tail call i32 @strcmp(i8* dereferenceable(1) %8, i8* dereferenceable(1) %1)
br label %10
10: ; preds = %2, %6
%11 = phi i32 [ %9, %6 ], [ -2, %2 ]
ret i32 %11
}