#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*/ *strchr(char const *, char);
int strlen(char *);
bool is_string_hex(char *text) {
  int i;
  int len_input_string = strlen(text);
  static const char characters[17] = "0123456789ABCDEF";
  for (i = 0; i < len_input_string; i++) {
    if (strchr(characters, text[i]) == NULL)
      return false;
  }
  return true;
}


x86 assembly (clang, -O0):
<is_string_hex>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,-0x18(%rbp)
movl   $0x0,-0x14(%rbp)
mov    -0x14(%rbp),%eax
cmp    -0x18(%rbp),%eax
jge    118c <is_string_hex+0x6c>
mov    -0x10(%rbp),%rax
movslq -0x14(%rbp),%rcx
lea    0xea6(%rip),%rdi
movsbl (%rax,%rcx,1),%esi
call   1040 <strchr@plt>
cmp    $0x0,%rax
jne    1179 <is_string_hex+0x59>
movl   $0x0,-0x4(%rbp)
jmp    1193 <is_string_hex+0x73>
jmp    117e <is_string_hex+0x5e>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    113f <is_string_hex+0x1f>
movl   $0x1,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<is_string_hex>:
push   %rbp
push   %r15
push   %r14
push   %r12
push   %rbx
mov    %rdi,%r12
call   1030 <strlen@plt>
mov    $0x1,%r14d
test   %eax,%eax
jle    1170 <is_string_hex+0x50>
mov    %eax,%ebp
xor    %ebx,%ebx
lea    0xebb(%rip),%r15
cs nopw 0x0(%rax,%rax,1)
nop
movsbl (%r12,%rbx,1),%esi
mov    %r15,%rdi
call   1040 <strchr@plt>
test   %rax,%rax
je     116d <is_string_hex+0x4d>
add    $0x1,%rbx
cmp    %rbx,%rbp
jne    1150 <is_string_hex+0x30>
jmp    1170 <is_string_hex+0x50>
xor    %r14d,%r14d
mov    %r14d,%eax
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@is_string_hex.characters = internal constant [17 x i8] c"0123456789ABCDEF\00"
define i32 @is_string_hex(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* %5
store i32 0, i32* %4
br label %8
8: ; preds = %22, %1
%9 = load i32, i32* %4
%10 = load i32, i32* %5
%11 = icmp slt i32 %9, %10
br i1 %11, label %12, label %25
12: ; preds = %8
%13 = load i8*, i8** %3
%14 = load i32, i32* %4
%15 = sext i32 %14 to i64
%16 = getelementptr inbounds i8, i8* %13, i64 %15
%17 = load i8, i8* %16
%18 = call i32* @strchr(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @is_string_hex.characters, i64 0, i64 0), i8 signext %17)
%19 = icmp eq i32* %18, null
br i1 %19, label %20, label %21
20: ; preds = %12
store i32 0, i32* %2
br label %26
21: ; preds = %12
br label %22
22: ; preds = %21
%23 = load i32, i32* %4
%24 = add nsw i32 %23, 1
store i32 %24, i32* %4
br label %8
25: ; preds = %8
store i32 1, i32* %2
br label %26
26: ; preds = %25, %20
%27 = load i32, i32* %2
ret i32 %27
}

LLVM IR (-O2):
@is_string_hex.characters = internal constant [17 x i8] c"0123456789ABCDEF\00"
define i32 @is_string_hex(i8* %0) {
%2 = tail call i32 @strlen(i8* %0)
%3 = icmp sgt i32 %2, 0
br i1 %3, label %4, label %15
4: ; preds = %1
%5 = zext i32 %2 to i64
br label %8
6: ; preds = %8
%7 = icmp eq i64 %14, %5
br i1 %7, label %15, label %8
8: ; preds = %4, %6
%9 = phi i64 [ 0, %4 ], [ %14, %6 ]
%10 = getelementptr inbounds i8, i8* %0, i64 %9
%11 = load i8, i8* %10
%12 = tail call i32* @strchr(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @is_string_hex.characters, i64 0, i64 0), i8 signext %11)
%13 = icmp eq i32* %12, null
%14 = add nuw nsw i64 %9, 1
br i1 %13, label %15, label %6
15: ; preds = %8, %6, %1
%16 = phi i32 [ 1, %1 ], [ 1, %6 ], [ 0, %8 ]
ret i32 %16
}