#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 */
scalar_t__ isspace(char);
int strlen(char *);
void trimright(char input[]) {
  int i = 0;
  int front = 0;
  int endpos = 0;
  int len = strlen(input);
  char *newString;
  endpos = len - 1;
  while (isspace(input[endpos])) {
    endpos--;
  }
  input[endpos + 1] = '\0';
}


x86 assembly (clang, -O0):
<trimright>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
movl   $0x0,-0xc(%rbp)
movl   $0x0,-0x10(%rbp)
movl   $0x0,-0x14(%rbp)
mov    -0x8(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,-0x18(%rbp)
mov    -0x18(%rbp),%eax
sub    $0x1,%eax
mov    %eax,-0x14(%rbp)
mov    -0x8(%rbp),%rax
movslq -0x14(%rbp),%rcx
movsbl (%rax,%rcx,1),%edi
call   1040 <isspace@plt>
cmp    $0x0,%rax
je     117f <trimright+0x5f>
mov    -0x14(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,-0x14(%rbp)
jmp    1156 <trimright+0x36>
mov    -0x8(%rbp),%rax
mov    -0x14(%rbp),%ecx
add    $0x1,%ecx
movslq %ecx,%rcx
movb   $0x0,(%rax,%rcx,1)
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<trimright>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
mov    %rdi,%r14
call   1030 <strlen@plt>
cltq
lea    (%rax,%r14,1),%rbx
add    $0xffffffffffffffff,%rbx
shl    $0x20,%rax
movabs $0x100000000,%r15
add    %rax,%r15
movabs $0xffffffff00000000,%r12
ff ff ff
cs nopw 0x0(%rax,%rax,1)
nop
add    %r12,%r15
movsbl (%rbx),%edi
call   1040 <isspace@plt>
add    $0xffffffffffffffff,%rbx
test   %rax,%rax
jne    1160 <trimright+0x40>
sar    $0x20,%r15
movb   $0x0,(%r14,%r15,1)
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
define void @trimright(i8* %0) {
%2 = alloca i8*
%3 = alloca i32
%4 = alloca i32
%5 = alloca i32
%6 = alloca i32
%7 = alloca i8*
store i8* %0, i8** %2
store i32 0, i32* %3
store i32 0, i32* %4
store i32 0, i32* %5
%8 = load i8*, i8** %2
%9 = call i32 @strlen(i8* %8)
store i32 %9, i32* %6
%10 = load i32, i32* %6
%11 = sub nsw i32 %10, 1
store i32 %11, i32* %5
br label %12
12: ; preds = %20, %1
%13 = load i8*, i8** %2
%14 = load i32, i32* %5
%15 = sext i32 %14 to i64
%16 = getelementptr inbounds i8, i8* %13, i64 %15
%17 = load i8, i8* %16
%18 = call i64 @isspace(i8 signext %17)
%19 = icmp ne i64 %18, 0
br i1 %19, label %20, label %23
20: ; preds = %12
%21 = load i32, i32* %5
%22 = add nsw i32 %21, -1
store i32 %22, i32* %5
br label %12
23: ; preds = %12
%24 = load i8*, i8** %2
%25 = load i32, i32* %5
%26 = add nsw i32 %25, 1
%27 = sext i32 %26 to i64
%28 = getelementptr inbounds i8, i8* %24, i64 %27
store i8 0, i8* %28
ret void
}

LLVM IR (-O2):
define void @trimright(i8* %0) {
%2 = tail call i32 @strlen(i8* %0)
%3 = sext i32 %2 to i64
br label %4
4: ; preds = %4, %1
%5 = phi i64 [ %6, %4 ], [ %3, %1 ]
%6 = add i64 %5, -1
%7 = getelementptr inbounds i8, i8* %0, i64 %6
%8 = load i8, i8* %7
%9 = tail call i64 @isspace(i8 signext %8)
%10 = icmp eq i64 %9, 0
br i1 %10, label %11, label %4
11: ; preds = %4
%12 = shl i64 %5, 32
%13 = ashr exact i64 %12, 32
%14 = getelementptr inbounds i8, i8* %0, i64 %13
store i8 0, i8* %14
ret void
}