#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 strlen(char *);
int checkNum(char *hex) {
  int len = strlen(hex);
  for (int i = 0; i < len; i++) {
    if (hex[i] >= '0' && hex[i] <= '9')
      continue;
    return 0;
  }
  return 1;
}


x86 assembly (clang, -O0):
<checkNum>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,-0x14(%rbp)
movl   $0x0,-0x18(%rbp)
mov    -0x18(%rbp),%eax
cmp    -0x14(%rbp),%eax
jge    1184 <checkNum+0x74>
mov    -0x10(%rbp),%rax
movslq -0x18(%rbp),%rcx
movsbl (%rax,%rcx,1),%eax
cmp    $0x30,%eax
jl     116a <checkNum+0x5a>
mov    -0x10(%rbp),%rax
movslq -0x18(%rbp),%rcx
movsbl (%rax,%rcx,1),%eax
cmp    $0x39,%eax
jg     116a <checkNum+0x5a>
jmp    1176 <checkNum+0x66>
movl   $0x0,-0x4(%rbp)
jmp    118b <checkNum+0x7b>
mov    -0x18(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x18(%rbp)
jmp    112f <checkNum+0x1f>
movl   $0x1,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<checkNum>:
push   %r14
push   %rbx
push   %rax
mov    %rdi,%r14
call   1030 <strlen@plt>
test   %eax,%eax
jle    1163 <checkNum+0x53>
mov    %eax,%ecx
mov    (%r14),%dl
add    $0xd0,%dl
xor    %eax,%eax
cmp    $0x9,%dl
ja     1168 <checkNum+0x58>
mov    %ecx,%ecx
mov    $0x1,%eax
cs nopw 0x0(%rax,%rax,1)
mov    %rax,%rdx
cmp    %rax,%rcx
je     1159 <checkNum+0x49>
movzbl (%r14,%rdx,1),%ebx
add    $0xd0,%bl
lea    0x1(%rdx),%rax
cmp    $0xa,%bl
jb     1140 <checkNum+0x30>
xor    %eax,%eax
cmp    %rcx,%rdx
setae  %al
jmp    1168 <checkNum+0x58>
mov    $0x1,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
define i32 @checkNum(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
%4 = alloca i32
%5 = alloca i32
store i8* %0, i8** %3
%6 = load i8*, i8** %3
%7 = call i32 @strlen(i8* %6)
store i32 %7, i32* %4
store i32 0, i32* %5
br label %8
8: ; preds = %30, %1
%9 = load i32, i32* %5
%10 = load i32, i32* %4
%11 = icmp slt i32 %9, %10
br i1 %11, label %12, label %33
12: ; preds = %8
%13 = load i8*, i8** %3
%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 = sext i8 %17 to i32
%19 = icmp sge i32 %18, 48
br i1 %19, label %20, label %29
20: ; preds = %12
%21 = load i8*, i8** %3
%22 = load i32, i32* %5
%23 = sext i32 %22 to i64
%24 = getelementptr inbounds i8, i8* %21, i64 %23
%25 = load i8, i8* %24
%26 = sext i8 %25 to i32
%27 = icmp sle i32 %26, 57
br i1 %27, label %28, label %29
28: ; preds = %20
br label %30
29: ; preds = %20, %12
store i32 0, i32* %2
br label %34
30: ; preds = %28
%31 = load i32, i32* %5
%32 = add nsw i32 %31, 1
store i32 %32, i32* %5
br label %8
33: ; preds = %8
store i32 1, i32* %2
br label %34
34: ; preds = %33, %29
%35 = load i32, i32* %2
ret i32 %35
}

LLVM IR (-O2):
define i32 @checkNum(i8* %0) {
%2 = tail call i32 @strlen(i8* %0)
%3 = icmp sgt i32 %2, 0
br i1 %3, label %4, label %22
4: ; preds = %1
%5 = zext i32 %2 to i64
%6 = zext i32 %2 to i64
%7 = load i8, i8* %0
%8 = add i8 %7, -48
%9 = icmp ult i8 %8, 10
br i1 %9, label %10, label %22
10: ; preds = %4, %13
%11 = phi i64 [ %18, %13 ], [ 1, %4 ]
%12 = icmp eq i64 %11, %6
br i1 %12, label %19, label %13
13: ; preds = %10
%14 = getelementptr inbounds i8, i8* %0, i64 %11
%15 = load i8, i8* %14
%16 = add i8 %15, -48
%17 = icmp ult i8 %16, 10
%18 = add nuw nsw i64 %11, 1
br i1 %17, label %10, label %19
19: ; preds = %10, %13
%20 = icmp uge i64 %11, %5
%21 = zext i1 %20 to i32
br label %22
22: ; preds = %19, %4, %1
%23 = phi i32 [ 1, %1 ], [ 0, %4 ], [ %21, %19 ]
ret i32 %23
}