#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(int);
int strlen(char *);
char *swi_right_trim(char *s) {
  char *sp = s + strlen(s) - 1;
  while (sp >= s && isspace((int)(unsigned char)*sp))
    *sp-- = '\0';
  return s;
}


x86 assembly (clang, -O0):
<swi_right_trim>:
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),%rcx
xor    %eax,%eax
cmp    -0x8(%rbp),%rcx
mov    %al,-0x19(%rbp)
jb     117a <swi_right_trim+0x5a>
mov    -0x10(%rbp),%rax
movzbl (%rax),%edi
call   1040 <isspace@plt>
cmp    $0x0,%rax
setne  %al
mov    %al,-0x19(%rbp)
mov    -0x19(%rbp),%al
test   $0x1,%al
jne    118a <swi_right_trim+0x6a>
jmp    11a1 <swi_right_trim+0x81>
mov    -0x10(%rbp),%rax
mov    %rax,%rcx
add    $0xffffffffffffffff,%rcx
mov    %rcx,-0x10(%rbp)
movb   $0x0,(%rax)
jmp    1151 <swi_right_trim+0x31>
mov    -0x8(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<swi_right_trim>:
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     1159 <swi_right_trim+0x39>
nopl   0x0(%rax,%rax,1)
movzbl (%rbx),%edi
call   1040 <isspace@plt>
test   %rax,%rax
je     1159 <swi_right_trim+0x39>
movb   $0x0,(%rbx)
add    $0xffffffffffffffff,%rbx
cmp    %r14,%rbx
jae    1140 <swi_right_trim+0x20>
mov    %r14,%rax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
define i8* @swi_right_trim(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 = %22, %1
%11 = load i8*, i8** %3
%12 = load i8*, i8** %2
%13 = icmp uge i8* %11, %12
br i1 %13, label %14, label %20
14: ; preds = %10
%15 = load i8*, i8** %3
%16 = load i8, i8* %15
%17 = zext i8 %16 to i32
%18 = call i64 @isspace(i32 %17)
%19 = icmp ne i64 %18, 0
br label %20
20: ; preds = %14, %10
%21 = phi i1 [ false, %10 ], [ %19, %14 ]
br i1 %21, label %22, label %25
22: ; preds = %20
%23 = load i8*, i8** %3
%24 = getelementptr inbounds i8, i8* %23, i32 -1
store i8* %24, i8** %3
store i8 0, i8* %23
br label %10
25: ; preds = %20
%26 = load i8*, i8** %2
ret i8* %26
}

LLVM IR (-O2):
define i8* @swi_right_trim(i8* returned %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 %16, label %7
7: ; preds = %1, %13
%8 = phi i8* [ %14, %13 ], [ %5, %1 ]
%9 = load i8, i8* %8
%10 = zext i8 %9 to i32
%11 = tail call i64 @isspace(i32 %10)
%12 = icmp eq i64 %11, 0
br i1 %12, label %16, label %13
13: ; preds = %7
store i8 0, i8* %8
%14 = getelementptr inbounds i8, i8* %8, i64 -1
%15 = icmp ult i8* %14, %0
br i1 %15, label %16, label %7
16: ; preds = %7, %13, %1
ret i8* %0
}