#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 *);
char *extractfname(char *fname) {
  char *cptmp;
  cptmp = fname + strlen(fname) - 1;
  while ((cptmp >= fname) && (cptmp[0] != '/'))
    cptmp--;
  return cptmp + 1;
}


x86 assembly (clang, -O0):
<extractfname>:
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
add    $0xffffffffffffffff,%rax
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rcx
xor    %eax,%eax
cmp    -0x8(%rbp),%rcx
mov    %al,-0x19(%rbp)
jb     1164 <extractfname+0x54>
mov    -0x10(%rbp),%rax
movsbl (%rax),%eax
cmp    $0x2f,%eax
setne  %al
mov    %al,-0x19(%rbp)
mov    -0x19(%rbp),%al
test   $0x1,%al
jne    1174 <extractfname+0x64>
jmp    1185 <extractfname+0x75>
mov    -0x10(%rbp),%rax
add    $0xffffffffffffffff,%rax
mov    %rax,-0x10(%rbp)
jmp    1141 <extractfname+0x31>
mov    -0x10(%rbp),%rax
add    $0x1,%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<extractfname>:
push   %rbx
mov    %rdi,%rbx
call   1030 <strlen@plt>
cltq
lea    (%rax,%rbx,1),%rcx
add    $0xffffffffffffffff,%rcx
cs nopw 0x0(%rax,%rax,1)
nopl   (%rax)
mov    %rcx,%rax
cmp    %rbx,%rcx
jb     1141 <extractfname+0x31>
lea    -0x1(%rax),%rcx
cmpb   $0x2f,(%rax)
jne    1130 <extractfname+0x20>
add    $0x1,%rax
pop    %rbx
ret

LLVM IR (-O0):
define i8* @extractfname(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
%9 = getelementptr inbounds i8, i8* %8, i64 -1
store i8* %9, i8** %3
br label %10
10: ; preds = %22, %1
%11 = load i8*, i8** %3
%12 = load i8*, i8** %2
%13 = icmp uge i8* %11, %12
br i1 %13, label %14, label %20
14: ; preds = %10
%15 = load i8*, i8** %3
%16 = getelementptr inbounds i8, i8* %15, i64 0
%17 = load i8, i8* %16
%18 = sext i8 %17 to i32
%19 = icmp ne i32 %18, 47
br label %20
20: ; preds = %14, %10
%21 = phi i1 [ false, %10 ], [ %19, %14 ]
br i1 %21, label %22, label %25
22: ; preds = %20
%23 = load i8*, i8** %3
%24 = getelementptr inbounds i8, i8* %23, i32 -1
store i8* %24, i8** %3
br label %10
25: ; preds = %20
%26 = load i8*, i8** %3
%27 = getelementptr inbounds i8, i8* %26, i64 1
ret i8* %27
}

LLVM IR (-O2):
define i8* @extractfname(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 = %9, %1
%6 = phi i8* [ %4, %1 ], [ %7, %9 ]
%7 = getelementptr inbounds i8, i8* %6, i64 -1
%8 = icmp ult i8* %7, %0
br i1 %8, label %12, label %9
9: ; preds = %5
%10 = load i8, i8* %7
%11 = icmp eq i8 %10, 47
br i1 %11, label %12, label %5
12: ; preds = %5, %9
ret i8* %6
}