#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 */
scalar_t__ strcmp(char *, char *);
char single_digit_bin_to_dec(char *dec_dig) {
  if (strcmp(dec_dig, "0001") == 0) {
    return '1';
  } else if (strcmp(dec_dig, "0010") == 0) {
    return '2';
  } else if (strcmp(dec_dig, "0011") == 0) {
    return '3';
  } else if (strcmp(dec_dig, "0100") == 0) {
    return '4';
  } else if (strcmp(dec_dig, "0101") == 0) {
    return '5';
  } else if (strcmp(dec_dig, "0110") == 0) {
    return '6';
  } else if (strcmp(dec_dig, "0111") == 0) {
    return '7';
  } else if (strcmp(dec_dig, "1000") == 0) {
    return '8';
  } else {
    return '9';
  }
}


x86 assembly (clang, -O0):
<single_digit_bin_to_dec>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xed9(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    113f <single_digit_bin_to_dec+0x2f>
movb   $0x31,-0x1(%rbp)
jmp    1238 <single_digit_bin_to_dec+0x128>
mov    -0x10(%rbp),%rdi
lea    0xebb(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    1162 <single_digit_bin_to_dec+0x52>
movb   $0x32,-0x1(%rbp)
jmp    1238 <single_digit_bin_to_dec+0x128>
mov    -0x10(%rbp),%rdi
lea    0xe9d(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    1185 <single_digit_bin_to_dec+0x75>
movb   $0x33,-0x1(%rbp)
jmp    1238 <single_digit_bin_to_dec+0x128>
mov    -0x10(%rbp),%rdi
lea    0xe7f(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    11a8 <single_digit_bin_to_dec+0x98>
movb   $0x34,-0x1(%rbp)
jmp    1238 <single_digit_bin_to_dec+0x128>
mov    -0x10(%rbp),%rdi
lea    0xe61(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    11cb <single_digit_bin_to_dec+0xbb>
movb   $0x35,-0x1(%rbp)
jmp    1238 <single_digit_bin_to_dec+0x128>
mov    -0x10(%rbp),%rdi
lea    0xe43(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    11ee <single_digit_bin_to_dec+0xde>
movb   $0x36,-0x1(%rbp)
jmp    1238 <single_digit_bin_to_dec+0x128>
mov    -0x10(%rbp),%rdi
lea    0xe25(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    1211 <single_digit_bin_to_dec+0x101>
movb   $0x37,-0x1(%rbp)
jmp    1238 <single_digit_bin_to_dec+0x128>
mov    -0x10(%rbp),%rdi
lea    0xe07(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    1234 <single_digit_bin_to_dec+0x124>
movb   $0x38,-0x1(%rbp)
jmp    1238 <single_digit_bin_to_dec+0x128>
movb   $0x39,-0x1(%rbp)
movsbl -0x1(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<single_digit_bin_to_dec>:
push   %rbx
mov    %rdi,%rbx
lea    0xee5(%rip),%rsi
call   1030 <strcmp@plt>
test   %rax,%rax
je     11be <single_digit_bin_to_dec+0xae>
lea    0xed5(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
test   %rax,%rax
je     11c2 <single_digit_bin_to_dec+0xb2>
lea    0xec2(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
test   %rax,%rax
je     11c6 <single_digit_bin_to_dec+0xb6>
lea    0xeb3(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
test   %rax,%rax
je     11ca <single_digit_bin_to_dec+0xba>
lea    0xea4(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
test   %rax,%rax
je     11ce <single_digit_bin_to_dec+0xbe>
lea    0xe95(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
test   %rax,%rax
je     11d2 <single_digit_bin_to_dec+0xc2>
lea    0xe86(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
test   %rax,%rax
je     11d6 <single_digit_bin_to_dec+0xc6>
lea    0xe77(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
cmp    $0x1,%rax
mov    $0x39,%al
sbb    $0x0,%al
pop    %rbx
ret
mov    $0x31,%al
pop    %rbx
ret
mov    $0x32,%al
pop    %rbx
ret
mov    $0x33,%al
pop    %rbx
ret
mov    $0x34,%al
pop    %rbx
ret
mov    $0x35,%al
pop    %rbx
ret
mov    $0x36,%al
pop    %rbx
ret
mov    $0x37,%al
pop    %rbx
ret

LLVM IR (-O0):
@.str = [5 x i8] c"0001\00"
@.str.1 = [5 x i8] c"0010\00"
@.str.2 = [5 x i8] c"0011\00"
@.str.3 = [5 x i8] c"0100\00"
@.str.4 = [5 x i8] c"0101\00"
@.str.5 = [5 x i8] c"0110\00"
@.str.6 = [5 x i8] c"0111\00"
@.str.7 = [5 x i8] c"1000\00"
define signext i8 @single_digit_bin_to_dec(i8* %0) {
%2 = alloca i8
%3 = alloca i8*
store i8* %0, i8** %3
%4 = load i8*, i8** %3
%5 = call i64 @strcmp(i8* %4, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0))
%6 = icmp eq i64 %5, 0
br i1 %6, label %7, label %8
7: ; preds = %1
store i8 49, i8* %2
br label %44
8: ; preds = %1
%9 = load i8*, i8** %3
%10 = call i64 @strcmp(i8* %9, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0))
%11 = icmp eq i64 %10, 0
br i1 %11, label %12, label %13
12: ; preds = %8
store i8 50, i8* %2
br label %44
13: ; preds = %8
%14 = load i8*, i8** %3
%15 = call i64 @strcmp(i8* %14, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0))
%16 = icmp eq i64 %15, 0
br i1 %16, label %17, label %18
17: ; preds = %13
store i8 51, i8* %2
br label %44
18: ; preds = %13
%19 = load i8*, i8** %3
%20 = call i64 @strcmp(i8* %19, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.3, i64 0, i64 0))
%21 = icmp eq i64 %20, 0
br i1 %21, label %22, label %23
22: ; preds = %18
store i8 52, i8* %2
br label %44
23: ; preds = %18
%24 = load i8*, i8** %3
%25 = call i64 @strcmp(i8* %24, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.4, i64 0, i64 0))
%26 = icmp eq i64 %25, 0
br i1 %26, label %27, label %28
27: ; preds = %23
store i8 53, i8* %2
br label %44
28: ; preds = %23
%29 = load i8*, i8** %3
%30 = call i64 @strcmp(i8* %29, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.5, i64 0, i64 0))
%31 = icmp eq i64 %30, 0
br i1 %31, label %32, label %33
32: ; preds = %28
store i8 54, i8* %2
br label %44
33: ; preds = %28
%34 = load i8*, i8** %3
%35 = call i64 @strcmp(i8* %34, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.6, i64 0, i64 0))
%36 = icmp eq i64 %35, 0
br i1 %36, label %37, label %38
37: ; preds = %33
store i8 55, i8* %2
br label %44
38: ; preds = %33
%39 = load i8*, i8** %3
%40 = call i64 @strcmp(i8* %39, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.7, i64 0, i64 0))
%41 = icmp eq i64 %40, 0
br i1 %41, label %42, label %43
42: ; preds = %38
store i8 56, i8* %2
br label %44
43: ; preds = %38
store i8 57, i8* %2
br label %44
44: ; preds = %43, %42, %37, %32, %27, %22, %17, %12, %7
%45 = load i8, i8* %2
ret i8 %45
}

LLVM IR (-O2):
@.str = [5 x i8] c"0001\00"
@.str.1 = [5 x i8] c"0010\00"
@.str.2 = [5 x i8] c"0011\00"
@.str.3 = [5 x i8] c"0100\00"
@.str.4 = [5 x i8] c"0101\00"
@.str.5 = [5 x i8] c"0110\00"
@.str.6 = [5 x i8] c"0111\00"
@.str.7 = [5 x i8] c"1000\00"
define signext i8 @single_digit_bin_to_dec(i8* %0) {
%2 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0))
%3 = icmp eq i64 %2, 0
br i1 %3, label %26, label %4
4: ; preds = %1
%5 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0))
%6 = icmp eq i64 %5, 0
br i1 %6, label %26, label %7
7: ; preds = %4
%8 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0))
%9 = icmp eq i64 %8, 0
br i1 %9, label %26, label %10
10: ; preds = %7
%11 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.3, i64 0, i64 0))
%12 = icmp eq i64 %11, 0
br i1 %12, label %26, label %13
13: ; preds = %10
%14 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.4, i64 0, i64 0))
%15 = icmp eq i64 %14, 0
br i1 %15, label %26, label %16
16: ; preds = %13
%17 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.5, i64 0, i64 0))
%18 = icmp eq i64 %17, 0
br i1 %18, label %26, label %19
19: ; preds = %16
%20 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.6, i64 0, i64 0))
%21 = icmp eq i64 %20, 0
br i1 %21, label %26, label %22
22: ; preds = %19
%23 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.7, i64 0, i64 0))
%24 = icmp eq i64 %23, 0
%25 = select i1 %24, i8 56, i8 57
br label %26
26: ; preds = %22, %19, %16, %13, %10, %7, %4, %1
%27 = phi i8 [ 49, %1 ], [ 50, %4 ], [ 51, %7 ], [ 52, %10 ], [ 53, %13 ], [ 54, %16 ], [ 55, %19 ], [ %25, %22 ]
ret i8 %27
}