#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 */
uintptr_t xtoi(char hexc) {
  uintptr_t ptr;
  switch (hexc) {
  case '0':
    ptr = (uintptr_t)0;
    break;
  case '1':
    ptr = (uintptr_t)1;
    break;
  case '2':
    ptr = (uintptr_t)2;
    break;
  case '3':
    ptr = (uintptr_t)3;
    break;
  case '4':
    ptr = (uintptr_t)4;
    break;
  case '5':
    ptr = (uintptr_t)5;
    break;
  case '6':
    ptr = (uintptr_t)6;
    break;
  case '7':
    ptr = (uintptr_t)7;
    break;
  case '8':
    ptr = (uintptr_t)8;
    break;
  case '9':
    ptr = (uintptr_t)9;
    break;
  case 'a':
  case 'A':
    ptr = (uintptr_t)10;
    break;
  case 'b':
  case 'B':
    ptr = (uintptr_t)11;
    break;
  case 'c':
  case 'C':
    ptr = (uintptr_t)12;
    break;
  case 'd':
  case 'D':
    ptr = (uintptr_t)13;
    break;
  case 'e':
  case 'E':
    ptr = (uintptr_t)14;
    break;
  case 'f':
  case 'F':
    ptr = (uintptr_t)15;
    break;
  default:
    return 0;
  }
  return ptr;
}


x86 assembly (clang, -O0):
<xtoi>:
push   %rbp
mov    %rsp,%rbp
mov    %dil,%al
mov    %al,-0x9(%rbp)
movsbl -0x9(%rbp),%eax
add    $0xffffffd0,%eax
mov    %eax,%ecx
mov    %rcx,-0x20(%rbp)
sub    $0x36,%eax
ja     1204 <xtoi+0x104>
mov    -0x20(%rbp),%rax
lea    0xed5(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
movq   $0x0,-0x18(%rbp)
jmp    1211 <xtoi+0x111>
movq   $0x1,-0x18(%rbp)
jmp    1211 <xtoi+0x111>
movq   $0x2,-0x18(%rbp)
jmp    1211 <xtoi+0x111>
movq   $0x3,-0x18(%rbp)
jmp    1211 <xtoi+0x111>
movq   $0x4,-0x18(%rbp)
jmp    1211 <xtoi+0x111>
movq   $0x5,-0x18(%rbp)
jmp    1211 <xtoi+0x111>
movq   $0x6,-0x18(%rbp)
jmp    1211 <xtoi+0x111>
movq   $0x7,-0x18(%rbp)
jmp    1211 <xtoi+0x111>
movq   $0x8,-0x18(%rbp)
jmp    1211 <xtoi+0x111>
movq   $0x9,-0x18(%rbp)
jmp    1211 <xtoi+0x111>
movq   $0xa,-0x18(%rbp)
jmp    1211 <xtoi+0x111>
movq   $0xb,-0x18(%rbp)
jmp    1211 <xtoi+0x111>
movq   $0xc,-0x18(%rbp)
jmp    1211 <xtoi+0x111>
movq   $0xd,-0x18(%rbp)
jmp    1211 <xtoi+0x111>
movq   $0xe,-0x18(%rbp)
jmp    1211 <xtoi+0x111>
movq   $0xf,-0x18(%rbp)
jmp    1211 <xtoi+0x111>
movq   $0x0,-0x8(%rbp)
jmp    1219 <xtoi+0x119>
mov    -0x18(%rbp),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<xtoi>:
xor    %eax,%eax
add    $0xffffffcf,%edi
cmp    $0x35,%edi
ja     113d <xtoi+0x3d>
lea    0xeef(%rip),%rcx
movslq (%rcx,%rdi,4),%rdx
add    %rcx,%rdx
jmp    *%rdx
mov    $0xa,%eax
ret
mov    $0xb,%eax
ret
mov    $0xc,%eax
ret
mov    $0xd,%eax
ret
mov    $0xe,%eax
ret
mov    $0xf,%eax
ret
mov    $0x1,%eax
ret
mov    $0x2,%eax
ret
mov    $0x3,%eax
ret
mov    $0x4,%eax
ret
mov    $0x5,%eax
ret
mov    $0x6,%eax
ret
mov    $0x7,%eax
ret
mov    $0x8,%eax
ret
mov    $0x9,%eax
ret

LLVM IR (-O0):
define i64 @xtoi(i8 signext %0) {
%2 = alloca i64
%3 = alloca i8
%4 = alloca i64
store i8 %0, i8* %3
%5 = load i8, i8* %3
%6 = sext i8 %5 to i32
switch i32 %6, label %23 [
i32 48, label %7
i32 49, label %8
i32 50, label %9
i32 51, label %10
i32 52, label %11
i32 53, label %12
i32 54, label %13
i32 55, label %14
i32 56, label %15
i32 57, label %16
i32 97, label %17
i32 65, label %17
i32 98, label %18
i32 66, label %18
i32 99, label %19
i32 67, label %19
i32 100, label %20
i32 68, label %20
i32 101, label %21
i32 69, label %21
i32 102, label %22
i32 70, label %22
]
7: ; preds = %1
store i64 0, i64* %4
br label %24
8: ; preds = %1
store i64 1, i64* %4
br label %24
9: ; preds = %1
store i64 2, i64* %4
br label %24
10: ; preds = %1
store i64 3, i64* %4
br label %24
11: ; preds = %1
store i64 4, i64* %4
br label %24
12: ; preds = %1
store i64 5, i64* %4
br label %24
13: ; preds = %1
store i64 6, i64* %4
br label %24
14: ; preds = %1
store i64 7, i64* %4
br label %24
15: ; preds = %1
store i64 8, i64* %4
br label %24
16: ; preds = %1
store i64 9, i64* %4
br label %24
17: ; preds = %1, %1
store i64 10, i64* %4
br label %24
18: ; preds = %1, %1
store i64 11, i64* %4
br label %24
19: ; preds = %1, %1
store i64 12, i64* %4
br label %24
20: ; preds = %1, %1
store i64 13, i64* %4
br label %24
21: ; preds = %1, %1
store i64 14, i64* %4
br label %24
22: ; preds = %1, %1
store i64 15, i64* %4
br label %24
23: ; preds = %1
store i64 0, i64* %2
br label %26
24: ; preds = %22, %21, %20, %19, %18, %17, %16, %15, %14, %13, %12, %11, %10, %9, %8, %7
%25 = load i64, i64* %4
store i64 %25, i64* %2
br label %26
26: ; preds = %24, %23
%27 = load i64, i64* %2
ret i64 %27
}

LLVM IR (-O2):
define i64 @xtoi(i8 signext %0) {
%2 = sext i8 %0 to i32
switch i32 %2, label %18 [
i32 70, label %17
i32 49, label %3
i32 50, label %4
i32 51, label %5
i32 52, label %6
i32 53, label %7
i32 54, label %8
i32 55, label %9
i32 56, label %10
i32 57, label %11
i32 97, label %12
i32 65, label %12
i32 98, label %13
i32 66, label %13
i32 99, label %14
i32 67, label %14
i32 100, label %15
i32 68, label %15
i32 101, label %16
i32 69, label %16
i32 102, label %17
]
3: ; preds = %1
br label %18
4: ; preds = %1
br label %18
5: ; preds = %1
br label %18
6: ; preds = %1
br label %18
7: ; preds = %1
br label %18
8: ; preds = %1
br label %18
9: ; preds = %1
br label %18
10: ; preds = %1
br label %18
11: ; preds = %1
br label %18
12: ; preds = %1, %1
br label %18
13: ; preds = %1, %1
br label %18
14: ; preds = %1, %1
br label %18
15: ; preds = %1, %1
br label %18
16: ; preds = %1, %1
br label %18
17: ; preds = %1, %1
br label %18
18: ; preds = %3, %4, %5, %6, %7, %8, %9, %10, %11, %12, %13, %14, %15, %16, %17, %1
%19 = phi i64 [ 15, %17 ], [ 14, %16 ], [ 13, %15 ], [ 12, %14 ], [ 11, %13 ], [ 10, %12 ], [ 9, %11 ], [ 8, %10 ], [ 7, %9 ], [ 6, %8 ], [ 5, %7 ], [ 4, %6 ], [ 3, %5 ], [ 2, %4 ], [ 1, %3 ], [ 0, %1 ]
ret i64 %19
}