#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 /*<<< orphan*/ strcpy(char *, char const *);
int strlen(char const *);
void ExtractFileExtension(const char *path, char *dest) {
  const char *src;
  src = path + strlen(path) - 1;
  while (src != path && *(src - 1) != '.')
    src--;
  if (src == path) {
    *dest = 0;
    return;
  }
  strcpy(dest, src);
}


x86 assembly (clang, -O0):
<ExtractFileExtension>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    -0x8(%rbp),%rax
mov    %rax,-0x20(%rbp)
mov    -0x8(%rbp),%rdi
call   1040 <strlen@plt>
mov    %eax,%ecx
mov    -0x20(%rbp),%rax
movslq %ecx,%rcx
add    %rcx,%rax
add    $0xffffffffffffffff,%rax
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rcx
xor    %eax,%eax
cmp    -0x8(%rbp),%rcx
mov    %al,-0x21(%rbp)
je     1179 <ExtractFileExtension+0x59>
mov    -0x18(%rbp),%rax
movsbl -0x1(%rax),%eax
cmp    $0x2e,%eax
setne  %al
mov    %al,-0x21(%rbp)
mov    -0x21(%rbp),%al
test   $0x1,%al
jne    1189 <ExtractFileExtension+0x69>
jmp    119a <ExtractFileExtension+0x7a>
mov    -0x18(%rbp),%rax
add    $0xffffffffffffffff,%rax
mov    %rax,-0x18(%rbp)
jmp    1155 <ExtractFileExtension+0x35>
mov    -0x18(%rbp),%rax
cmp    -0x8(%rbp),%rax
jne    11b4 <ExtractFileExtension+0x94>
mov    -0x10(%rbp),%rax
movb   $0x0,(%rax)
jmp    11c1 <ExtractFileExtension+0xa1>
mov    -0x10(%rbp),%rdi
mov    -0x18(%rbp),%rsi
call   1030 <strcpy@plt>
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<ExtractFileExtension>:
push   %r14
push   %rbx
push   %rax
mov    %rsi,%r14
mov    %rdi,%rbx
call   1040 <strlen@plt>
cltq
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax,%rax,1)
cmp    $0x1,%rax
je     1169 <ExtractFileExtension+0x49>
lea    -0x1(%rax),%rcx
cmpb   $0x2e,-0x2(%rbx,%rax,1)
mov    %rcx,%rax
jne    1140 <ExtractFileExtension+0x20>
add    %rcx,%rbx
mov    %r14,%rdi
mov    %rbx,%rsi
add    $0x8,%rsp
pop    %rbx
pop    %r14
jmp    1030 <strcpy@plt>
movb   $0x0,(%r14)
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
define void @ExtractFileExtension(i8* %0, i8* %1) {
%3 = alloca i8*
%4 = alloca i8*
%5 = alloca i8*
store i8* %0, i8** %3
store i8* %1, i8** %4
%6 = load i8*, i8** %3
%7 = load i8*, i8** %3
%8 = call i32 @strlen(i8* %7)
%9 = sext i32 %8 to i64
%10 = getelementptr inbounds i8, i8* %6, i64 %9
%11 = getelementptr inbounds i8, i8* %10, i64 -1
store i8* %11, i8** %5
br label %12
12: ; preds = %24, %2
%13 = load i8*, i8** %5
%14 = load i8*, i8** %3
%15 = icmp ne i8* %13, %14
br i1 %15, label %16, label %22
16: ; preds = %12
%17 = load i8*, i8** %5
%18 = getelementptr inbounds i8, i8* %17, i64 -1
%19 = load i8, i8* %18
%20 = sext i8 %19 to i32
%21 = icmp ne i32 %20, 46
br label %22
22: ; preds = %16, %12
%23 = phi i1 [ false, %12 ], [ %21, %16 ]
br i1 %23, label %24, label %27
24: ; preds = %22
%25 = load i8*, i8** %5
%26 = getelementptr inbounds i8, i8* %25, i32 -1
store i8* %26, i8** %5
br label %12
27: ; preds = %22
%28 = load i8*, i8** %5
%29 = load i8*, i8** %3
%30 = icmp eq i8* %28, %29
br i1 %30, label %31, label %33
31: ; preds = %27
%32 = load i8*, i8** %4
store i8 0, i8* %32
br label %37
33: ; preds = %27
%34 = load i8*, i8** %4
%35 = load i8*, i8** %5
%36 = call i32 @strcpy(i8* %34, i8* %35)
br label %37
37: ; preds = %33, %31
ret void
}

LLVM IR (-O2):
define void @ExtractFileExtension(i8* %0, i8* %1) {
%3 = tail call i32 @strlen(i8* %0)
%4 = sext i32 %3 to i64
%5 = getelementptr inbounds i8, i8* %0, i64 %4
br label %6
6: ; preds = %10, %2
%7 = phi i8* [ %5, %2 ], [ %8, %10 ]
%8 = getelementptr inbounds i8, i8* %7, i64 -1
%9 = icmp eq i8* %8, %0
br i1 %9, label %14, label %10
10: ; preds = %6
%11 = getelementptr inbounds i8, i8* %7, i64 -2
%12 = load i8, i8* %11
%13 = icmp eq i8 %12, 46
br i1 %13, label %15, label %6
14: ; preds = %6
store i8 0, i8* %1
br label %17
15: ; preds = %10
%16 = tail call i32 @strcpy(i8* %1, i8* %8)
br label %17
17: ; preds = %15, %14
ret void
}