#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 strlen(char const *);
const char *tail(const char *foo) {
  const char *tmp = foo + strlen(foo);
  while (*tmp != '/' && tmp != foo)
    tmp--;
  if (*tmp == '/')
    tmp++;
  return tmp;
}


x86 assembly (clang, -O0):
<tail>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rax
mov    %rax,-0x18(%rbp)
mov    -0x8(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,%ecx
mov    -0x18(%rbp),%rax
movslq %ecx,%rcx
add    %rcx,%rax
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rax
movsbl (%rax),%ecx
xor    %eax,%eax
cmp    $0x2f,%ecx
mov    %al,-0x19(%rbp)
je     1160 <tail+0x50>
mov    -0x10(%rbp),%rax
cmp    -0x8(%rbp),%rax
setne  %al
mov    %al,-0x19(%rbp)
mov    -0x19(%rbp),%al
test   $0x1,%al
jne    1170 <tail+0x60>
jmp    1181 <tail+0x71>
mov    -0x10(%rbp),%rax
add    $0xffffffffffffffff,%rax
mov    %rax,-0x10(%rbp)
jmp    113d <tail+0x2d>
mov    -0x10(%rbp),%rax
movsbl (%rax),%eax
cmp    $0x2f,%eax
jne    119d <tail+0x8d>
mov    -0x10(%rbp),%rax
add    $0x1,%rax
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<tail>:
push   %rbx
mov    %rdi,%rbx
call   1030 <strlen@plt>
movslq %eax,%rcx
lea    (%rcx,%rbx,1),%rax
add    $0x1,%rax
cs nopw 0x0(%rax,%rax,1)
xchg   %ax,%ax
movzbl -0x1(%rax),%edx
add    $0xffffffffffffffff,%rax
test   %rcx,%rcx
je     1146 <tail+0x36>
add    $0xffffffffffffffff,%rcx
cmp    $0x2f,%dl
jne    1130 <tail+0x20>
xor    %ecx,%ecx
cmp    $0x2f,%dl
sete   %cl
add    %rcx,%rax
pop    %rbx
ret

LLVM IR (-O0):
define i8* @tail(i8* %0) {
%2 = alloca i8*
%3 = alloca i8*
store i8* %0, i8** %2
%4 = load i8*, i8** %2
%5 = load i8*, i8** %2
%6 = call i32 @strlen(i8* %5)
%7 = sext i32 %6 to i64
%8 = getelementptr inbounds i8, i8* %4, i64 %7
store i8* %8, i8** %3
br label %9
9: ; preds = %20, %1
%10 = load i8*, i8** %3
%11 = load i8, i8* %10
%12 = sext i8 %11 to i32
%13 = icmp ne i32 %12, 47
br i1 %13, label %14, label %18
14: ; preds = %9
%15 = load i8*, i8** %3
%16 = load i8*, i8** %2
%17 = icmp ne i8* %15, %16
br label %18
18: ; preds = %14, %9
%19 = phi i1 [ false, %9 ], [ %17, %14 ]
br i1 %19, label %20, label %23
20: ; preds = %18
%21 = load i8*, i8** %3
%22 = getelementptr inbounds i8, i8* %21, i32 -1
store i8* %22, i8** %3
br label %9
23: ; preds = %18
%24 = load i8*, i8** %3
%25 = load i8, i8* %24
%26 = sext i8 %25 to i32
%27 = icmp eq i32 %26, 47
br i1 %27, label %28, label %31
28: ; preds = %23
%29 = load i8*, i8** %3
%30 = getelementptr inbounds i8, i8* %29, i32 1
store i8* %30, i8** %3
br label %31
31: ; preds = %28, %23
%32 = load i8*, i8** %3
ret i8* %32
}

LLVM IR (-O2):
define i8* @tail(i8* %0) {
%2 = tail call i32 @strlen(i8* %0)
%3 = sext i32 %2 to i64
%4 = getelementptr inbounds i8, i8* %0, i64 %3
br label %5
5: ; preds = %5, %1
%6 = phi i8* [ %4, %1 ], [ %11, %5 ]
%7 = load i8, i8* %6
%8 = icmp ne i8 %7, 47
%9 = icmp ne i8* %6, %0
%10 = and i1 %9, %8
%11 = getelementptr inbounds i8, i8* %6, i64 -1
br i1 %10, label %5, label %12
12: ; preds = %5
%13 = icmp eq i8 %7, 47
%14 = zext i1 %13 to i64
%15 = getelementptr i8, i8* %6, i64 %14
ret i8* %15
}