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


x86 assembly (clang, -O0):
<hexdigit_to_int>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %dil,%al
mov    %al,-0x5(%rbp)
movsbl -0x5(%rbp),%eax
add    $0xffffffd0,%eax
mov    %eax,%ecx
mov    %rcx,-0x10(%rbp)
sub    $0x36,%eax
ja     1208 <hexdigit_to_int+0xf8>
mov    -0x10(%rbp),%rax
lea    0xec1(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
movl   $0x0,-0x4(%rbp)
jmp    120f <hexdigit_to_int+0xff>
movl   $0x1,-0x4(%rbp)
jmp    120f <hexdigit_to_int+0xff>
movl   $0x2,-0x4(%rbp)
jmp    120f <hexdigit_to_int+0xff>
movl   $0x3,-0x4(%rbp)
jmp    120f <hexdigit_to_int+0xff>
movl   $0x4,-0x4(%rbp)
jmp    120f <hexdigit_to_int+0xff>
movl   $0x5,-0x4(%rbp)
jmp    120f <hexdigit_to_int+0xff>
movl   $0x6,-0x4(%rbp)
jmp    120f <hexdigit_to_int+0xff>
movl   $0x7,-0x4(%rbp)
jmp    120f <hexdigit_to_int+0xff>
movl   $0x8,-0x4(%rbp)
jmp    120f <hexdigit_to_int+0xff>
movl   $0x9,-0x4(%rbp)
jmp    120f <hexdigit_to_int+0xff>
movl   $0xa,-0x4(%rbp)
jmp    120f <hexdigit_to_int+0xff>
movl   $0xb,-0x4(%rbp)
jmp    120f <hexdigit_to_int+0xff>
movl   $0xc,-0x4(%rbp)
jmp    120f <hexdigit_to_int+0xff>
movl   $0xd,-0x4(%rbp)
jmp    120f <hexdigit_to_int+0xff>
movl   $0xe,-0x4(%rbp)
jmp    120f <hexdigit_to_int+0xff>
movl   $0xf,-0x4(%rbp)
jmp    120f <hexdigit_to_int+0xff>
mov    $0x0,%al
call   1030 <abort@plt>
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<hexdigit_to_int>:
push   %rax
add    $0xffffffd0,%edi
cmp    $0x37,%edi
jae    1138 <hexdigit_to_int+0x28>
movabs $0x7e0000007e03ff,%rax
bt     %rdi,%rax
jae    1138 <hexdigit_to_int+0x28>
movslq %edi,%rax
lea    0xecd(%rip),%rcx
mov    (%rcx,%rax,4),%eax
pop    %rcx
ret
xor    %eax,%eax
call   1030 <abort@plt>

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

LLVM IR (-O2):
@switch.table.hexdigit_to_int = [55 x i32] [i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 8, i32 9, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 10, i32 11, i32 12, i32 13, i32 14, i32 15, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 10, i32 11, i32 12, i32 13, i32 14, i32 15]
define i32 @hexdigit_to_int(i8 signext %0) {
%2 = sext i8 %0 to i32
%3 = add nsw i32 %2, -48
%4 = icmp ult i32 %3, 55
br i1 %4, label %7, label %5
5: ; preds = %7, %1
%6 = tail call i32 (...) @abort()
unreachable
7: ; preds = %1
%8 = zext i32 %3 to i64
%9 = lshr i64 35465847073801215, %8
%10 = and i64 %9, 1
%11 = icmp eq i64 %10, 0
br i1 %11, label %5, label %12
12: ; preds = %7
%13 = sext i32 %3 to i64
%14 = getelementptr inbounds [55 x i32], [55 x i32]* @switch.table.hexdigit_to_int, i64 0, i64 %13
%15 = load i32, i32* %14
ret i32 %15
}