#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*/ isspace(char);
int strlen(char *);
void trim_end(char *str) {
  char *last = str + strlen(str) - 1;
  while (last >= str) {
    if (!isspace(*last)) {
      return;
    }
    *last = 0;
    last--;
  }
}


x86 assembly (clang, -O0):
<trim_end>:
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     1191 <trim_end+0x71>
mov    -0x10(%rbp),%rax
movsbl (%rax),%edi
call   1040 <isspace@plt>
cmp    $0x0,%eax
jne    1179 <trim_end+0x59>
jmp    1191 <trim_end+0x71>
mov    -0x10(%rbp),%rax
movb   $0x0,(%rax)
mov    -0x10(%rbp),%rax
add    $0xffffffffffffffff,%rax
mov    %rax,-0x10(%rbp)
jmp    1151 <trim_end+0x31>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<trim_end>:
push   %r14
push   %rbx
push   %rax
mov    %rdi,%r14
call   1030 <strlen@plt>
cltq
lea    (%r14,%rax,1),%rbx
add    $0xffffffffffffffff,%rbx
cmp    %r14,%rbx
jb     1158 <trim_end+0x38>
nopl   0x0(%rax,%rax,1)
movsbl (%rbx),%edi
call   1040 <isspace@plt>
test   %eax,%eax
je     1158 <trim_end+0x38>
movb   $0x0,(%rbx)
add    $0xffffffffffffffff,%rbx
cmp    %r14,%rbx
jae    1140 <trim_end+0x20>
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
define void @trim_end(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 = %20, %1
%11 = load i8*, i8** %3
%12 = load i8*, i8** %2
%13 = icmp uge i8* %11, %12
br i1 %13, label %14, label %24
14: ; preds = %10
%15 = load i8*, i8** %3
%16 = load i8, i8* %15
%17 = call i32 @isspace(i8 signext %16)
%18 = icmp ne i32 %17, 0
br i1 %18, label %20, label %19
19: ; preds = %14
br label %24
20: ; preds = %14
%21 = load i8*, i8** %3
store i8 0, i8* %21
%22 = load i8*, i8** %3
%23 = getelementptr inbounds i8, i8* %22, i32 -1
store i8* %23, i8** %3
br label %10
24: ; preds = %19, %10
ret void
}

LLVM IR (-O2):
define void @trim_end(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 %15, label %7
7: ; preds = %1, %12
%8 = phi i8* [ %13, %12 ], [ %5, %1 ]
%9 = load i8, i8* %8
%10 = tail call i32 @isspace(i8 signext %9)
%11 = icmp eq i32 %10, 0
br i1 %11, label %15, label %12
12: ; preds = %7
store i8 0, i8* %8
%13 = getelementptr inbounds i8, i8* %8, i64 -1
%14 = icmp ult i8* %13, %0
br i1 %14, label %15, label %7
15: ; preds = %7, %12, %1
ret void
}