#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*/ fprintf(int /*<<< orphan*/, char *, int);
int /*<<< orphan*/ stderr;
int h2n(int v) {
  switch (v) {
  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:
    fprintf(stderr, "error: %c not a hex digit\n", v);
    return -1;
  }
}


x86 assembly (clang, -O0):
<h2n>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %edi,-0x8(%rbp)
mov    -0x8(%rbp),%eax
add    $0xffffffd0,%eax
mov    %eax,%ecx
mov    %rcx,-0x10(%rbp)
sub    $0x36,%eax
ja     1204 <h2n+0xf4>
mov    -0x10(%rbp),%rax
lea    0xec5(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
movl   $0x0,-0x4(%rbp)
jmp    1223 <h2n+0x113>
movl   $0x1,-0x4(%rbp)
jmp    1223 <h2n+0x113>
movl   $0x2,-0x4(%rbp)
jmp    1223 <h2n+0x113>
movl   $0x3,-0x4(%rbp)
jmp    1223 <h2n+0x113>
movl   $0x4,-0x4(%rbp)
jmp    1223 <h2n+0x113>
movl   $0x5,-0x4(%rbp)
jmp    1223 <h2n+0x113>
movl   $0x6,-0x4(%rbp)
jmp    1223 <h2n+0x113>
movl   $0x7,-0x4(%rbp)
jmp    1223 <h2n+0x113>
movl   $0x8,-0x4(%rbp)
jmp    1223 <h2n+0x113>
movl   $0x9,-0x4(%rbp)
jmp    1223 <h2n+0x113>
movl   $0xa,-0x4(%rbp)
jmp    1223 <h2n+0x113>
movl   $0xb,-0x4(%rbp)
jmp    1223 <h2n+0x113>
movl   $0xc,-0x4(%rbp)
jmp    1223 <h2n+0x113>
movl   $0xd,-0x4(%rbp)
jmp    1223 <h2n+0x113>
movl   $0xe,-0x4(%rbp)
jmp    1223 <h2n+0x113>
movl   $0xf,-0x4(%rbp)
jmp    1223 <h2n+0x113>
mov    0x2dd5(%rip),%rax
mov    (%rax),%edi
mov    -0x8(%rbp),%edx
lea    0xec5(%rip),%rsi
call   1030 <fprintf@plt>
movl   $0xffffffff,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<h2n>:
push   %rax
mov    %edi,%edx
lea    -0x30(%rdx),%eax
cmp    $0x37,%eax
jae    112b <h2n+0x1b>
movabs $0x7e0000007e03ff,%rcx
bt     %rax,%rcx
jb     1147 <h2n+0x37>
mov    0x2eae(%rip),%rax
mov    (%rax),%edi
lea    0xec5(%rip),%rsi
call   1030 <fprintf@plt>
mov    $0xffffffff,%eax
pop    %rcx
ret
cltq
lea    0xecc(%rip),%rcx
mov    (%rcx,%rax,4),%eax
pop    %rcx
ret

LLVM IR (-O0):
@stderr = global i32 0
@.str = [27 x i8] c"error: %c not a hex digit\0A\00"
define i32 @h2n(i32 %0) {
%2 = alloca i32
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %21 [
i32 48, label %5
i32 49, label %6
i32 50, label %7
i32 51, label %8
i32 52, label %9
i32 53, label %10
i32 54, label %11
i32 55, label %12
i32 56, label %13
i32 57, label %14
i32 65, label %15
i32 97, label %15
i32 66, label %16
i32 98, label %16
i32 67, label %17
i32 99, label %17
i32 68, label %18
i32 100, label %18
i32 69, label %19
i32 101, label %19
i32 70, label %20
i32 102, label %20
]
5: ; preds = %1
store i32 0, i32* %2
br label %25
6: ; preds = %1
store i32 1, i32* %2
br label %25
7: ; preds = %1
store i32 2, i32* %2
br label %25
8: ; preds = %1
store i32 3, i32* %2
br label %25
9: ; preds = %1
store i32 4, i32* %2
br label %25
10: ; preds = %1
store i32 5, i32* %2
br label %25
11: ; preds = %1
store i32 6, i32* %2
br label %25
12: ; preds = %1
store i32 7, i32* %2
br label %25
13: ; preds = %1
store i32 8, i32* %2
br label %25
14: ; preds = %1
store i32 9, i32* %2
br label %25
15: ; preds = %1, %1
store i32 10, i32* %2
br label %25
16: ; preds = %1, %1
store i32 11, i32* %2
br label %25
17: ; preds = %1, %1
store i32 12, i32* %2
br label %25
18: ; preds = %1, %1
store i32 13, i32* %2
br label %25
19: ; preds = %1, %1
store i32 14, i32* %2
br label %25
20: ; preds = %1, %1
store i32 15, i32* %2
br label %25
21: ; preds = %1
%22 = load i32, i32* @stderr
%23 = load i32, i32* %3
%24 = call i32 @fprintf(i32 %22, i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str, i64 0, i64 0), i32 %23)
store i32 -1, i32* %2
br label %25
25: ; preds = %21, %20, %19, %18, %17, %16, %15, %14, %13, %12, %11, %10, %9, %8, %7, %6, %5
%26 = load i32, i32* %2
ret i32 %26
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [27 x i8] c"error: %c not a hex digit\0A\00"
@switch.table.h2n = [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 @h2n(i32 %0) {
%2 = add i32 %0, -48
%3 = icmp ult i32 %2, 55
br i1 %3, label %7, label %4
4: ; preds = %7, %1
%5 = load i32, i32* @stderr
%6 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str, i64 0, i64 0), i32 %0)
br label %16
7: ; preds = %1
%8 = zext i32 %2 to i64
%9 = lshr i64 35465847073801215, %8
%10 = and i64 %9, 1
%11 = icmp eq i64 %10, 0
br i1 %11, label %4, label %12
12: ; preds = %7
%13 = sext i32 %2 to i64
%14 = getelementptr inbounds [55 x i32], [55 x i32]* @switch.table.h2n, i64 0, i64 %13
%15 = load i32, i32* %14
br label %16
16: ; preds = %12, %4
%17 = phi i32 [ -1, %4 ], [ %15, %12 ]
ret i32 %17
}