unsigned char crc8(unsigned char crc, unsigned char ch) {
  static const unsigned char table[256] = {
      0x00, 0x5E, 0xBC, 0xE2, 0x61, 0x3F, 0xDD, 0x83, 0xC2, 0x9C, 0x7E, 0x20,
      0xA3, 0xFD, 0x1F, 0x41, 0x9D, 0xC3, 0x21, 0x7F, 0xFC, 0xA2, 0x40, 0x1E,
      0x5F, 0x01, 0xE3, 0xBD, 0x3E, 0x60, 0x82, 0xDC, 0x23, 0x7D, 0x9F, 0xC1,
      0x42, 0x1C, 0xFE, 0xA0, 0xE1, 0xBF, 0x5D, 0x03, 0x80, 0xDE, 0x3C, 0x62,
      0xBE, 0xE0, 0x02, 0x5C, 0xDF, 0x81, 0x63, 0x3D, 0x7C, 0x22, 0xC0, 0x9E,
      0x1D, 0x43, 0xA1, 0xFF, 0x46, 0x18, 0xFA, 0xA4, 0x27, 0x79, 0x9B, 0xC5,
      0x84, 0xDA, 0x38, 0x66, 0xE5, 0xBB, 0x59, 0x07, 0xDB, 0x85, 0x67, 0x39,
      0xBA, 0xE4, 0x06, 0x58, 0x19, 0x47, 0xA5, 0xFB, 0x78, 0x26, 0xC4, 0x9A,
      0x65, 0x3B, 0xD9, 0x87, 0x04, 0x5A, 0xB8, 0xE6, 0xA7, 0xF9, 0x1B, 0x45,
      0xC6, 0x98, 0x7A, 0x24, 0xF8, 0xA6, 0x44, 0x1A, 0x99, 0xC7, 0x25, 0x7B,
      0x3A, 0x64, 0x86, 0xD8, 0x5B, 0x05, 0xE7, 0xB9, 0x8C, 0xD2, 0x30, 0x6E,
      0xED, 0xB3, 0x51, 0x0F, 0x4E, 0x10, 0xF2, 0xAC, 0x2F, 0x71, 0x93, 0xCD,
      0x11, 0x4F, 0xAD, 0xF3, 0x70, 0x2E, 0xCC, 0x92, 0xD3, 0x8D, 0x6F, 0x31,
      0xB2, 0xEC, 0x0E, 0x50, 0xAF, 0xF1, 0x13, 0x4D, 0xCE, 0x90, 0x72, 0x2C,
      0x6D, 0x33, 0xD1, 0x8F, 0x0C, 0x52, 0xB0, 0xEE, 0x32, 0x6C, 0x8E, 0xD0,
      0x53, 0x0D, 0xEF, 0xB1, 0xF0, 0xAE, 0x4C, 0x12, 0x91, 0xCF, 0x2D, 0x73,
      0xCA, 0x94, 0x76, 0x28, 0xAB, 0xF5, 0x17, 0x49, 0x08, 0x56, 0xB4, 0xEA,
      0x69, 0x37, 0xD5, 0x8B, 0x57, 0x09, 0xEB, 0xB5, 0x36, 0x68, 0x8A, 0xD4,
      0x95, 0xCB, 0x29, 0x77, 0xF4, 0xAA, 0x48, 0x16, 0xE9, 0xB7, 0x55, 0x0B,
      0x88, 0xD6, 0x34, 0x6A, 0x2B, 0x75, 0x97, 0xC9, 0x4A, 0x14, 0xF6, 0xA8,
      0x74, 0x2A, 0xC8, 0x96, 0x15, 0x4B, 0xA9, 0xF7, 0xB6, 0xE8, 0x0A, 0x54,
      0xD7, 0x89, 0x6B, 0x35};
  return (table[crc ^ ch]);
}


x86 assembly (clang, -O0):
<crc8>:
push   %rbp
mov    %rsp,%rbp
mov    %sil,%al
mov    %dil,%cl
mov    %cl,-0x1(%rbp)
mov    %al,-0x2(%rbp)
movzbl -0x1(%rbp),%eax
movzbl -0x2(%rbp),%ecx
xor    %ecx,%eax
movslq %eax,%rcx
lea    0xedc(%rip),%rax
movzbl (%rax,%rcx,1),%eax
pop    %rbp
ret

x86 assembly (clang, -O2):
<crc8>:
xor    %esi,%edi
lea    0xef7(%rip),%rax
mov    (%rdi,%rax,1),%al
ret

LLVM IR (-O0):
@crc8.table = internal constant [256 x i8] c"\00^\BC\E2a?\DD\83\C2\9C~ \A3\FD\1FA\9D\C3!\7F\FC\A2@\1E_\01\E3\BD>`\82\DC#}\9F\C1B\1C\FE\A0\E1\BF]\03\80\DE<b\BE\E0\02\\\DF\81c=|\22\C0\9E\1DC\A1\FFF\18\FA\A4'y\9B\C5\84\DA8f\E5\BBY\07\DB\85g9\BA\E4\06X\19G\A5\FBx&\C4\9Ae;\D9\87\04Z\B8\E6\A7\F9\1BE\C6\98z$\F8\A6D\1A\99\C7%{:d\86\D8[\05\E7\B9\8C\D20n\ED\B3Q\0FN\10\F2\AC/q\93\CD\11O\AD\F3p.\CC\92\D3\8Do1\B2\EC\0EP\AF\F1\13M\CE\90r,m3\D1\8F\0CR\B0\EE2l\8E\D0S\0D\EF\B1\F0\AEL\12\91\CF-s\CA\94v(\AB\F5\17I\08V\B4\EAi7\D5\8BW\09\EB\B56h\8A\D4\95\CB)w\F4\AAH\16\E9\B7U\0B\88\D64j+u\97\C9J\14\F6\A8t*\C8\96\15K\A9\F7\B6\E8\0AT\D7\89k5"
define zeroext i8 @crc8(i8 zeroext %0, i8 zeroext %1) {
%3 = alloca i8
%4 = alloca i8
store i8 %0, i8* %3
store i8 %1, i8* %4
%5 = load i8, i8* %3
%6 = zext i8 %5 to i32
%7 = load i8, i8* %4
%8 = zext i8 %7 to i32
%9 = xor i32 %6, %8
%10 = sext i32 %9 to i64
%11 = getelementptr inbounds [256 x i8], [256 x i8]* @crc8.table, i64 0, i64 %10
%12 = load i8, i8* %11
ret i8 %12
}

LLVM IR (-O2):
@crc8.table = internal unnamed_addr constant [256 x i8] c"\00^\BC\E2a?\DD\83\C2\9C~ \A3\FD\1FA\9D\C3!\7F\FC\A2@\1E_\01\E3\BD>`\82\DC#}\9F\C1B\1C\FE\A0\E1\BF]\03\80\DE<b\BE\E0\02\\\DF\81c=|\22\C0\9E\1DC\A1\FFF\18\FA\A4'y\9B\C5\84\DA8f\E5\BBY\07\DB\85g9\BA\E4\06X\19G\A5\FBx&\C4\9Ae;\D9\87\04Z\B8\E6\A7\F9\1BE\C6\98z$\F8\A6D\1A\99\C7%{:d\86\D8[\05\E7\B9\8C\D20n\ED\B3Q\0FN\10\F2\AC/q\93\CD\11O\AD\F3p.\CC\92\D3\8Do1\B2\EC\0EP\AF\F1\13M\CE\90r,m3\D1\8F\0CR\B0\EE2l\8E\D0S\0D\EF\B1\F0\AEL\12\91\CF-s\CA\94v(\AB\F5\17I\08V\B4\EAi7\D5\8BW\09\EB\B56h\8A\D4\95\CB)w\F4\AAH\16\E9\B7U\0B\88\D64j+u\97\C9J\14\F6\A8t*\C8\96\15K\A9\F7\B6\E8\0AT\D7\89k5"
define zeroext i8 @crc8(i8 zeroext %0, i8 zeroext %1) {
%3 = xor i8 %1, %0
%4 = zext i8 %3 to i64
%5 = getelementptr inbounds [256 x i8], [256 x i8]* @crc8.table, i64 0, i64 %4
%6 = load i8, i8* %5
ret i8 %6
}