#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 *);
void rtrim(char *str) {
  for (char *p = str + strlen(str) - 1; p >= str; p--) {
    if (*p != '\r' && *p != '\n' && *p != ' ' && *p != '\t')
      return;
    *p = '\0';
  }
}


x86 assembly (clang, -O0):
<rtrim>:
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),%rax
cmp    -0x8(%rbp),%rax
jb     11ac <rtrim+0x9c>
mov    -0x10(%rbp),%rax
movsbl (%rax),%eax
cmp    $0xd,%eax
je     1194 <rtrim+0x84>
mov    -0x10(%rbp),%rax
movsbl (%rax),%eax
cmp    $0xa,%eax
je     1194 <rtrim+0x84>
mov    -0x10(%rbp),%rax
movsbl (%rax),%eax
cmp    $0x20,%eax
je     1194 <rtrim+0x84>
mov    -0x10(%rbp),%rax
movsbl (%rax),%eax
cmp    $0x9,%eax
je     1194 <rtrim+0x84>
jmp    11ac <rtrim+0x9c>
mov    -0x10(%rbp),%rax
movb   $0x0,(%rax)
mov    -0x10(%rbp),%rax
add    $0xffffffffffffffff,%rax
mov    %rax,-0x10(%rbp)
jmp    1141 <rtrim+0x31>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<rtrim>:
push   %rbx
mov    %rdi,%rbx
call   1030 <strlen@plt>
cltq
add    %rbx,%rax
add    $0xffffffffffffffff,%rax
cmp    %rbx,%rax
jb     115b <rtrim+0x4b>
movabs $0x100002600,%rcx
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax,%rax,1)
movzbl (%rax),%edx
cmp    $0x20,%rdx
ja     115b <rtrim+0x4b>
bt     %rdx,%rcx
jae    115b <rtrim+0x4b>
movb   $0x0,(%rax)
add    $0xffffffffffffffff,%rax
cmp    %rbx,%rax
jae    1140 <rtrim+0x30>
pop    %rbx
ret

LLVM IR (-O0):
define void @rtrim(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 = %37, %1
%11 = load i8*, i8** %3
%12 = load i8*, i8** %2
%13 = icmp uge i8* %11, %12
br i1 %13, label %14, label %40
14: ; preds = %10
%15 = load i8*, i8** %3
%16 = load i8, i8* %15
%17 = sext i8 %16 to i32
%18 = icmp ne i32 %17, 13
br i1 %18, label %19, label %35
19: ; preds = %14
%20 = load i8*, i8** %3
%21 = load i8, i8* %20
%22 = sext i8 %21 to i32
%23 = icmp ne i32 %22, 10
br i1 %23, label %24, label %35
24: ; preds = %19
%25 = load i8*, i8** %3
%26 = load i8, i8* %25
%27 = sext i8 %26 to i32
%28 = icmp ne i32 %27, 32
br i1 %28, label %29, label %35
29: ; preds = %24
%30 = load i8*, i8** %3
%31 = load i8, i8* %30
%32 = sext i8 %31 to i32
%33 = icmp ne i32 %32, 9
br i1 %33, label %34, label %35
34: ; preds = %29
br label %40
35: ; preds = %29, %24, %19, %14
%36 = load i8*, i8** %3
store i8 0, i8* %36
br label %37
37: ; preds = %35
%38 = load i8*, i8** %3
%39 = getelementptr inbounds i8, i8* %38, i32 -1
store i8* %39, i8** %3
br label %10
40: ; preds = %34, %10
ret void
}

LLVM IR (-O2):
define void @rtrim(i8* %0) {
%2 = tail call i32 @strlen(i8* %0)
%3 = sext i32 %2 to i64
%4 = getelementptr inbounds i8, i8* %0, i64 %3
%5 = getelementptr inbounds i8, i8* %4, i64 -1
%6 = icmp ult i8* %5, %0
br i1 %6, label %13, label %7
7: ; preds = %1, %10
%8 = phi i8* [ %11, %10 ], [ %5, %1 ]
%9 = load i8, i8* %8
switch i8 %9, label %13 [
i8 13, label %10
i8 10, label %10
i8 32, label %10
i8 9, label %10
]
10: ; preds = %7, %7, %7, %7
store i8 0, i8* %8
%11 = getelementptr inbounds i8, i8* %8, i64 -1
%12 = icmp ult i8* %11, %0
br i1 %12, label %13, label %7
13: ; preds = %10, %7, %1
ret void
}