llvm/lib/Target/Lanai/LanaiAluCode.h

   1 //===-- LanaiAluCode.h - ALU operator encoding ----------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // The encoding for ALU operators used in RM and RRM operands
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_LIB_TARGET_LANAI_LANAIALUCODE_H
  14 #define LLVM_LIB_TARGET_LANAI_LANAIALUCODE_H
  15
  16 #include "llvm/ADT/StringSwitch.h"
  17 #include "llvm/Support/ErrorHandling.h"
  18
  19 namespace llvm {
  20 namespace LPAC {
  21 enum AluCode {
  22   ADD = 0x00,
  23   ADDC = 0x01,
  24   SUB = 0x02,
  25   SUBB = 0x03,
  26   AND = 0x04,
  27   OR = 0x05,
  28   XOR = 0x06,
  29   SPECIAL = 0x07,
  30
  31   // Shift instructions are treated as SPECIAL when encoding the machine
  32   // instruction, but kept distinct until lowering. The constant values are
  33   // chosen to ease lowering.
  34   SHL = 0x17,
  35   SRL = 0x27,
  36   SRA = 0x37,
  37
  38   // Indicates an unknown/unsupported operator
  39   UNKNOWN = 0xFF,
  40 };
  41
  42 // Bits indicating post- and pre-operators should be tested and set using Is*
  43 // and Make* utility functions
  44 const int Lanai_PRE_OP = 0x40;
  45 const int Lanai_POST_OP = 0x80;
  46
  47 inline static unsigned encodeLanaiAluCode(unsigned AluOp) {
  48   unsigned const OP_ENCODING_MASK = 0x07;
  49   return AluOp & OP_ENCODING_MASK;
  50 }
  51
  52 inline static unsigned getAluOp(unsigned AluOp) {
  53   unsigned const ALU_MASK = 0x3F;
  54   return AluOp & ALU_MASK;
  55 }
  56
  57 inline static bool isPreOp(unsigned AluOp) { return AluOp & Lanai_PRE_OP; }
  58
  59 inline static bool isPostOp(unsigned AluOp) { return AluOp & Lanai_POST_OP; }
  60
  61 inline static unsigned makePreOp(unsigned AluOp) {
  62   assert(!isPostOp(AluOp) && "Operator can't be a post- and pre-op");
  63   return AluOp | Lanai_PRE_OP;
  64 }
  65
  66 inline static unsigned makePostOp(unsigned AluOp) {
  67   assert(!isPreOp(AluOp) && "Operator can't be a post- and pre-op");
  68   return AluOp | Lanai_POST_OP;
  69 }
  70
  71 inline static bool modifiesOp(unsigned AluOp) {
  72   return isPreOp(AluOp) || isPostOp(AluOp);
  73 }
  74
  75 inline static const char *lanaiAluCodeToString(unsigned AluOp) {
  76   switch (getAluOp(AluOp)) {
  77   case ADD:
  78     return "add";
  79   case ADDC:
  80     return "addc";
  81   case SUB:
  82     return "sub";
  83   case SUBB:
  84     return "subb";
  85   case AND:
  86     return "and";
  87   case OR:
  88     return "or";
  89   case XOR:
  90     return "xor";
  91   case SHL:
  92     return "sh";
  93   case SRL:
  94     return "sh";
  95   case SRA:
  96     return "sha";
  97   default:
  98     llvm_unreachable("Invalid ALU code.");
  99   }
 100 }
 101
 102 inline static AluCode stringToLanaiAluCode(StringRef S) {
 103   return StringSwitch<AluCode>(S)
 104       .Case("add", ADD)
 105       .Case("addc", ADDC)
 106       .Case("sub", SUB)
 107       .Case("subb", SUBB)
 108       .Case("and", AND)
 109       .Case("or", OR)
 110       .Case("xor", XOR)
 111       .Case("sh", SHL)
 112       .Case("srl", SRL)
 113       .Case("sha", SRA)
 114       .Default(UNKNOWN);
 115 }
 116 } // namespace LPAC
 117 } // namespace llvm
 118
 119 #endif // LLVM_LIB_TARGET_LANAI_LANAIALUCODE_H