lib/Target/NVPTX/NVPTXMCExpr.cpp

   1 //===-- NVPTXMCExpr.cpp - NVPTX specific MC expression classes ------------===//
   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 #include "NVPTXMCExpr.h"
  10 #include "llvm/ADT/StringExtras.h"
  11 #include "llvm/MC/MCAssembler.h"
  12 #include "llvm/MC/MCContext.h"
  13 #include "llvm/Support/Format.h"
  14 using namespace llvm;
  15
  16 #define DEBUG_TYPE "nvptx-mcexpr"
  17
  18 const NVPTXFloatMCExpr *
  19 NVPTXFloatMCExpr::create(VariantKind Kind, const APFloat &Flt, MCContext &Ctx) {
  20   return new (Ctx) NVPTXFloatMCExpr(Kind, Flt);
  21 }
  22
  23 void NVPTXFloatMCExpr::printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const {
  24   bool Ignored;
  25   unsigned NumHex;
  26   APFloat APF = getAPFloat();
  27
  28   switch (Kind) {
  29   default: llvm_unreachable("Invalid kind!");
  30   case VK_NVPTX_HALF_PREC_FLOAT:
  31     // ptxas does not have a way to specify half-precision floats.
  32     // Instead we have to print and load fp16 constants as .b16
  33     OS << "0x";
  34     NumHex = 4;
  35     APF.convert(APFloat::IEEEhalf(), APFloat::rmNearestTiesToEven, &Ignored);
  36     break;
  37   case VK_NVPTX_SINGLE_PREC_FLOAT:
  38     OS << "0f";
  39     NumHex = 8;
  40     APF.convert(APFloat::IEEEsingle(), APFloat::rmNearestTiesToEven, &Ignored);
  41     break;
  42   case VK_NVPTX_DOUBLE_PREC_FLOAT:
  43     OS << "0d";
  44     NumHex = 16;
  45     APF.convert(APFloat::IEEEdouble(), APFloat::rmNearestTiesToEven, &Ignored);
  46     break;
  47   }
  48
  49   APInt API = APF.bitcastToAPInt();
  50   OS << format_hex_no_prefix(API.getZExtValue(), NumHex, /*Upper=*/true);
  51 }
  52
  53 const NVPTXGenericMCSymbolRefExpr*
  54 NVPTXGenericMCSymbolRefExpr::create(const MCSymbolRefExpr *SymExpr,
  55                                     MCContext &Ctx) {
  56   return new (Ctx) NVPTXGenericMCSymbolRefExpr(SymExpr);
  57 }
  58
  59 void NVPTXGenericMCSymbolRefExpr::printImpl(raw_ostream &OS,
  60                                             const MCAsmInfo *MAI) const {
  61   OS << "generic(";
  62   SymExpr->print(OS, MAI);
  63   OS << ")";
  64 }