#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 tail_strip(char *s) {
  int i, n = strlen(s) - 1;
  for (i = n; i > 0; i--) {
    if (s[i] == '\n' || s[i] == ' ') {
      s[i] = '\0';
    } else {
      break;
    }
  }
}


x86 assembly (clang, -O0):
<tail_strip>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rdi
call   1030 <strlen@plt>
sub    $0x1,%eax
mov    %eax,-0x10(%rbp)
mov    -0x10(%rbp),%eax
mov    %eax,-0xc(%rbp)
cmpl   $0x0,-0xc(%rbp)
jle    118e <tail_strip+0x7e>
mov    -0x8(%rbp),%rax
movslq -0xc(%rbp),%rcx
movsbl (%rax,%rcx,1),%eax
cmp    $0xa,%eax
je     1165 <tail_strip+0x55>
mov    -0x8(%rbp),%rax
movslq -0xc(%rbp),%rcx
movsbl (%rax,%rcx,1),%eax
cmp    $0x20,%eax
jne    1176 <tail_strip+0x66>
mov    -0x8(%rbp),%rax
movslq -0xc(%rbp),%rcx
movb   $0x0,(%rax,%rcx,1)
jmp    117b <tail_strip+0x6b>
jmp    118e <tail_strip+0x7e>
jmp    1180 <tail_strip+0x70>
mov    -0xc(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,-0xc(%rbp)
jmp    1131 <tail_strip+0x21>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<tail_strip>:
push   %rbx
mov    %rdi,%rbx
call   1030 <strlen@plt>
cmp    $0x2,%eax
jl     114f <tail_strip+0x3f>
mov    %eax,%eax
add    $0x1,%rax
jmp    113e <tail_strip+0x2e>
cs nopw 0x0(%rax,%rax,1)
movb   $0x0,(%rbx,%rcx,1)
add    $0xffffffffffffffff,%rax
cmp    $0x2,%rax
jbe    114f <tail_strip+0x3f>
lea    -0x2(%rax),%ecx
movzbl (%rbx,%rcx,1),%edx
cmp    $0x20,%dl
je     1130 <tail_strip+0x20>
cmp    $0xa,%dl
je     1130 <tail_strip+0x20>
pop    %rbx
ret

LLVM IR (-O0):
define void @tail_strip(i8* %0) {
%2 = alloca i8*
%3 = alloca i32
%4 = alloca i32
store i8* %0, i8** %2
%5 = load i8*, i8** %2
%6 = call i32 @strlen(i8* %5)
%7 = sub nsw i32 %6, 1
store i32 %7, i32* %4
%8 = load i32, i32* %4
store i32 %8, i32* %3
br label %9
9: ; preds = %35, %1
%10 = load i32, i32* %3
%11 = icmp sgt i32 %10, 0
br i1 %11, label %12, label %38
12: ; preds = %9
%13 = load i8*, i8** %2
%14 = load i32, i32* %3
%15 = sext i32 %14 to i64
%16 = getelementptr inbounds i8, i8* %13, i64 %15
%17 = load i8, i8* %16
%18 = sext i8 %17 to i32
%19 = icmp eq i32 %18, 10
br i1 %19, label %28, label %20
20: ; preds = %12
%21 = load i8*, i8** %2
%22 = load i32, i32* %3
%23 = sext i32 %22 to i64
%24 = getelementptr inbounds i8, i8* %21, i64 %23
%25 = load i8, i8* %24
%26 = sext i8 %25 to i32
%27 = icmp eq i32 %26, 32
br i1 %27, label %28, label %33
28: ; preds = %20, %12
%29 = load i8*, i8** %2
%30 = load i32, i32* %3
%31 = sext i32 %30 to i64
%32 = getelementptr inbounds i8, i8* %29, i64 %31
store i8 0, i8* %32
br label %34
33: ; preds = %20
br label %38
34: ; preds = %28
br label %35
35: ; preds = %34
%36 = load i32, i32* %3
%37 = add nsw i32 %36, -1
store i32 %37, i32* %3
br label %9
38: ; preds = %33, %9
ret void
}

LLVM IR (-O2):
define void @tail_strip(i8* %0) {
%2 = tail call i32 @strlen(i8* %0)
%3 = icmp sgt i32 %2, 1
br i1 %3, label %4, label %14
4: ; preds = %1
%5 = zext i32 %2 to i64
br label %6
6: ; preds = %4, %12
%7 = phi i64 [ %5, %4 ], [ %8, %12 ]
%8 = add nsw i64 %7, -1
%9 = and i64 %8, 4294967295
%10 = getelementptr inbounds i8, i8* %0, i64 %9
%11 = load i8, i8* %10
switch i8 %11, label %14 [
i8 10, label %12
i8 32, label %12
]
12: ; preds = %6, %6
store i8 0, i8* %10
%13 = icmp ugt i64 %7, 2
br i1 %13, label %6, label %14
14: ; preds = %12, %6, %1
ret void
}