#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*/ isalnum(char);
unsigned int strlen(char *);
int is_a_device(char *dev) {
  unsigned i;
  for (i = 0; i < strlen(dev); i++) {
    if (!isalnum(dev[i]))
      return (0);
  }
  return (1);
}


x86 assembly (clang, -O0):
<is_a_device>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
movl   $0x0,-0x14(%rbp)
mov    -0x14(%rbp),%eax
mov    %eax,-0x18(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,%ecx
mov    -0x18(%rbp),%eax
cmp    %ecx,%eax
jae    1187 <is_a_device+0x67>
mov    -0x10(%rbp),%rax
mov    -0x14(%rbp),%ecx
movsbl (%rax,%rcx,1),%edi
call   1040 <isalnum@plt>
cmp    $0x0,%eax
jne    1174 <is_a_device+0x54>
movl   $0x0,-0x4(%rbp)
jmp    118e <is_a_device+0x6e>
jmp    1179 <is_a_device+0x59>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    1133 <is_a_device+0x13>
movl   $0x1,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<is_a_device>:
push   %rbp
push   %r14
push   %rbx
mov    %rdi,%rbx
call   1030 <strlen@plt>
mov    $0x1,%r14d
test   %eax,%eax
je     1165 <is_a_device+0x45>
xor    %ebp,%ebp
nopl   0x0(%rax,%rax,1)
movsbl (%rbx,%rbp,1),%edi
call   1040 <isalnum@plt>
test   %eax,%eax
je     1162 <is_a_device+0x42>
add    $0x1,%rbp
mov    %rbx,%rdi
call   1030 <strlen@plt>
mov    %eax,%eax
cmp    %rax,%rbp
jb     1140 <is_a_device+0x20>
jmp    1165 <is_a_device+0x45>
xor    %r14d,%r14d
mov    %r14d,%eax
pop    %rbx
pop    %r14
pop    %rbp
ret

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

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