#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 trim(char *s) {
  while (s[0] && isspace(s[strlen(s) - 1]))
    s[strlen(s) - 1] = 0;
}


x86 assembly (clang, -O0):
<trim>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rax
movsbl (%rax),%ecx
xor    %eax,%eax
cmp    $0x0,%ecx
mov    %al,-0x9(%rbp)
je     1171 <trim+0x51>
mov    -0x8(%rbp),%rax
mov    %rax,-0x18(%rbp)
mov    -0x8(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,%ecx
mov    -0x18(%rbp),%rax
sub    $0x1,%ecx
movslq %ecx,%rcx
movsbl (%rax,%rcx,1),%edi
call   1040 <isspace@plt>
cmp    $0x0,%rax
setne  %al
mov    %al,-0x9(%rbp)
mov    -0x9(%rbp),%al
test   $0x1,%al
jne    1181 <trim+0x61>
jmp    11a7 <trim+0x87>
mov    -0x8(%rbp),%rax
mov    %rax,-0x20(%rbp)
mov    -0x8(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,%ecx
mov    -0x20(%rbp),%rax
sub    $0x1,%ecx
movslq %ecx,%rcx
movb   $0x0,(%rax,%rcx,1)
jmp    112c <trim+0xc>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<trim>:
push   %rbx
cmpb   $0x0,(%rdi)
je     115d <trim+0x3d>
mov    %rdi,%rbx
nopl   0x0(%rax)
mov    %rbx,%rdi
call   1030 <strlen@plt>
cltq
movsbl -0x1(%rax,%rbx,1),%edi
call   1040 <isspace@plt>
test   %rax,%rax
je     115d <trim+0x3d>
mov    %rbx,%rdi
call   1030 <strlen@plt>
cltq
movb   $0x0,-0x1(%rax,%rbx,1)
cmpb   $0x0,(%rbx)
jne    1130 <trim+0x10>
pop    %rbx
ret

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

LLVM IR (-O2):
define void @trim(i8* %0) {
%2 = load i8, i8* %0
%3 = icmp eq i8 %2, 0
br i1 %3, label %19, label %4
4: ; preds = %1, %12
%5 = tail call i32 @strlen(i8* %0)
%6 = add nsw i32 %5, -1
%7 = sext i32 %6 to i64
%8 = getelementptr inbounds i8, i8* %0, i64 %7
%9 = load i8, i8* %8
%10 = tail call i64 @isspace(i8 signext %9)
%11 = icmp eq i64 %10, 0
br i1 %11, label %19, label %12
12: ; preds = %4
%13 = tail call i32 @strlen(i8* %0)
%14 = add nsw i32 %13, -1
%15 = sext i32 %14 to i64
%16 = getelementptr inbounds i8, i8* %0, i64 %15
store i8 0, i8* %16
%17 = load i8, i8* %0
%18 = icmp eq i8 %17, 0
br i1 %18, label %19, label %4
19: ; preds = %4, %12, %1
ret void
}