#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__ ispunct(char);
int strlen(char *);
char *strip_punct(char *arg) {
  int i;
  for (i = strlen(arg); --i >= 0;)
    if (ispunct(arg[i]))
      arg[i] = '\0';
    else
      break;
  return arg;
}


x86 assembly (clang, -O0):
<strip_punct>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,-0xc(%rbp)
mov    -0xc(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,-0xc(%rbp)
cmp    $0x0,%eax
jl     1180 <strip_punct+0x60>
mov    -0x8(%rbp),%rax
movslq -0xc(%rbp),%rcx
movsbl (%rax,%rcx,1),%edi
call   1040 <ispunct@plt>
cmp    $0x0,%rax
je     1176 <strip_punct+0x56>
mov    -0x8(%rbp),%rax
movslq -0xc(%rbp),%rcx
movb   $0x0,(%rax,%rcx,1)
jmp    117b <strip_punct+0x5b>
jmp    1180 <strip_punct+0x60>
jmp    1138 <strip_punct+0x18>
mov    -0x8(%rbp),%rax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<strip_punct>:
push   %r15
push   %r14
push   %rbx
mov    %rdi,%r14
call   1030 <strlen@plt>
test   %eax,%eax
jle    1162 <strip_punct+0x42>
mov    %eax,%ebx
add    $0x1,%rbx
nopw   0x0(%rax,%rax,1)
lea    -0x2(%rbx),%r15d
movsbl (%r14,%r15,1),%edi
call   1040 <ispunct@plt>
test   %rax,%rax
je     1162 <strip_punct+0x42>
movb   $0x0,(%r14,%r15,1)
add    $0xffffffffffffffff,%rbx
cmp    $0x1,%rbx
ja     1140 <strip_punct+0x20>
mov    %r14,%rax
pop    %rbx
pop    %r14
pop    %r15
ret

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

LLVM IR (-O2):
define i8* @strip_punct(i8* returned %0) {
%2 = tail call i32 @strlen(i8* %0)
%3 = icmp sgt i32 %2, 0
br i1 %3, label %4, label %16
4: ; preds = %1
%5 = zext i32 %2 to i64
br label %6
6: ; preds = %4, %14
%7 = phi i64 [ %5, %4 ], [ %8, %14 ]
%8 = add nsw i64 %7, -1
%9 = and i64 %8, 4294967295
%10 = getelementptr inbounds i8, i8* %0, i64 %9
%11 = load i8, i8* %10
%12 = tail call i64 @ispunct(i8 signext %11)
%13 = icmp eq i64 %12, 0
br i1 %13, label %16, label %14
14: ; preds = %6
store i8 0, i8* %10
%15 = icmp ugt i64 %7, 1
br i1 %15, label %6, label %16
16: ; preds = %14, %6, %1
ret i8* %0
}