#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 const *, int);
int strlen(char const *);
int endwith(const char str[], const char substr[]) {
  int lenStr = strlen(str);
  int lenSubstr = strlen(substr);
  if (lenStr < lenSubstr)
    return 0;
  return memcmp((char *)(str + lenStr - lenSubstr), substr, lenSubstr) == 0;
}


x86 assembly (clang, -O0):
<endwith>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
mov    %rsi,-0x18(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,-0x1c(%rbp)
mov    -0x18(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,-0x20(%rbp)
mov    -0x1c(%rbp),%eax
cmp    -0x20(%rbp),%eax
jge    1160 <endwith+0x40>
movl   $0x0,-0x4(%rbp)
jmp    1192 <endwith+0x72>
mov    -0x10(%rbp),%rdi
movslq -0x1c(%rbp),%rax
add    %rax,%rdi
movslq -0x20(%rbp),%rcx
xor    %eax,%eax
sub    %rcx,%rax
add    %rax,%rdi
mov    -0x18(%rbp),%rsi
mov    -0x20(%rbp),%edx
call   1040 <memcmp@plt>
cmp    $0x0,%rax
sete   %al
and    $0x1,%al
movzbl %al,%eax
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<endwith>:
push   %rbp
push   %r14
push   %rbx
mov    %rsi,%r14
mov    %rdi,%rbx
call   1030 <strlen@plt>
mov    %eax,%ebp
mov    %r14,%rdi
call   1030 <strlen@plt>
xor    %ecx,%ecx
cmp    %eax,%ebp
jl     1160 <endwith+0x40>
movslq %ebp,%rcx
add    %rcx,%rbx
movslq %eax,%rcx
sub    %rcx,%rbx
mov    %rbx,%rdi
mov    %r14,%rsi
mov    %eax,%edx
call   1040 <memcmp@plt>
xor    %ecx,%ecx
test   %rax,%rax
sete   %cl
mov    %ecx,%eax
pop    %rbx
pop    %r14
pop    %rbp
ret

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

LLVM IR (-O2):
define i32 @endwith(i8* %0, i8* %1) {
%3 = tail call i32 @strlen(i8* %0)
%4 = tail call i32 @strlen(i8* %1)
%5 = icmp slt i32 %3, %4
br i1 %5, label %15, label %6
6: ; preds = %2
%7 = sext i32 %3 to i64
%8 = getelementptr inbounds i8, i8* %0, i64 %7
%9 = sext i32 %4 to i64
%10 = sub nsw i64 0, %9
%11 = getelementptr inbounds i8, i8* %8, i64 %10
%12 = tail call i64 @memcmp(i8* %11, i8* %1, i32 %4)
%13 = icmp eq i64 %12, 0
%14 = zext i1 %13 to i32
br label %15
15: ; preds = %2, %6
%16 = phi i32 [ %14, %6 ], [ 0, %2 ]
ret i32 %16
}