unsigned char decodeInt(int number) {
  switch (number) {
  case 0:
    return 0x3f;
  case 1:
    return 0x06;
  case 2:
    return 0x5b;
  case 3:
    return 0x4f;
  case 4:
    return 0x66;
  case 5:
    return 0x6d;
  case 6:
    return 0x7d;
  case 7:
    return 0x07;
  case 8:
    return 0x7f;
  case 9:
    return 0x6f;
  case 10:
    return 0x77;
  case 11:
    return 0x7c;
  case 12:
    return 0x39;
  case 13:
    return 0x5e;
  case 14:
    return 0x79;
  case 15:
    return 0x71;
  default:
    return 0x00;
  }
}


x86 assembly (clang, -O0):
<decodeInt>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0x8(%rbp)
mov    -0x8(%rbp),%eax
mov    %rax,-0x10(%rbp)
sub    $0xf,%rax
ja     11bc <decodeInt+0xbc>
mov    -0x10(%rbp),%rax
lea    0xedd(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
movb   $0x3f,-0x1(%rbp)
jmp    11c0 <decodeInt+0xc0>
movb   $0x6,-0x1(%rbp)
jmp    11c0 <decodeInt+0xc0>
movb   $0x5b,-0x1(%rbp)
jmp    11c0 <decodeInt+0xc0>
movb   $0x4f,-0x1(%rbp)
jmp    11c0 <decodeInt+0xc0>
movb   $0x66,-0x1(%rbp)
jmp    11c0 <decodeInt+0xc0>
movb   $0x6d,-0x1(%rbp)
jmp    11c0 <decodeInt+0xc0>
movb   $0x7d,-0x1(%rbp)
jmp    11c0 <decodeInt+0xc0>
movb   $0x7,-0x1(%rbp)
jmp    11c0 <decodeInt+0xc0>
movb   $0x7f,-0x1(%rbp)
jmp    11c0 <decodeInt+0xc0>
movb   $0x6f,-0x1(%rbp)
jmp    11c0 <decodeInt+0xc0>
movb   $0x77,-0x1(%rbp)
jmp    11c0 <decodeInt+0xc0>
movb   $0x7c,-0x1(%rbp)
jmp    11c0 <decodeInt+0xc0>
movb   $0x39,-0x1(%rbp)
jmp    11c0 <decodeInt+0xc0>
movb   $0x5e,-0x1(%rbp)
jmp    11c0 <decodeInt+0xc0>
movb   $0x79,-0x1(%rbp)
jmp    11c0 <decodeInt+0xc0>
movb   $0x71,-0x1(%rbp)
jmp    11c0 <decodeInt+0xc0>
movb   $0x0,-0x1(%rbp)
movzbl -0x1(%rbp),%eax
pop    %rbp
ret

x86 assembly (clang, -O2):
<decodeInt>:
cmp    $0xf,%edi
ja     1113 <decodeInt+0x13>
movslq %edi,%rax
lea    0xef1(%rip),%rcx
mov    (%rax,%rcx,1),%al
ret
xor    %eax,%eax
ret

LLVM IR (-O0):
define zeroext i8 @decodeInt(i32 %0) {
%2 = alloca i8
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %21 [
i32 0, label %5
i32 1, label %6
i32 2, label %7
i32 3, label %8
i32 4, label %9
i32 5, label %10
i32 6, label %11
i32 7, label %12
i32 8, label %13
i32 9, label %14
i32 10, label %15
i32 11, label %16
i32 12, label %17
i32 13, label %18
i32 14, label %19
i32 15, label %20
]
5: ; preds = %1
store i8 63, i8* %2
br label %22
6: ; preds = %1
store i8 6, i8* %2
br label %22
7: ; preds = %1
store i8 91, i8* %2
br label %22
8: ; preds = %1
store i8 79, i8* %2
br label %22
9: ; preds = %1
store i8 102, i8* %2
br label %22
10: ; preds = %1
store i8 109, i8* %2
br label %22
11: ; preds = %1
store i8 125, i8* %2
br label %22
12: ; preds = %1
store i8 7, i8* %2
br label %22
13: ; preds = %1
store i8 127, i8* %2
br label %22
14: ; preds = %1
store i8 111, i8* %2
br label %22
15: ; preds = %1
store i8 119, i8* %2
br label %22
16: ; preds = %1
store i8 124, i8* %2
br label %22
17: ; preds = %1
store i8 57, i8* %2
br label %22
18: ; preds = %1
store i8 94, i8* %2
br label %22
19: ; preds = %1
store i8 121, i8* %2
br label %22
20: ; preds = %1
store i8 113, i8* %2
br label %22
21: ; preds = %1
store i8 0, i8* %2
br label %22
22: ; preds = %21, %20, %19, %18, %17, %16, %15, %14, %13, %12, %11, %10, %9, %8, %7, %6, %5
%23 = load i8, i8* %2
ret i8 %23
}

LLVM IR (-O2):
@switch.table.decodeInt = [16 x i8] c"?\06[Ofm}\07\7Fow|9^yq"
define zeroext i8 @decodeInt(i32 %0) {
%2 = icmp ult i32 %0, 16
br i1 %2, label %3, label %7
3: ; preds = %1
%4 = sext i32 %0 to i64
%5 = getelementptr inbounds [16 x i8], [16 x i8]* @switch.table.decodeInt, i64 0, i64 %4
%6 = load i8, i8* %5
br label %7
7: ; preds = %1, %3
%8 = phi i8 [ %6, %3 ], [ 0, %1 ]
ret i8 %8
}