src/arch/gcn3/registers.cc - public/gem5 - Git at Google

 /*
  * Copyright (c) 2015-2017 Advanced Micro Devices, Inc.
  * All rights reserved.
  *
  * For use for simulation and test purposes only
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  * 1. Redistributions of source code must retain the above copyright notice,
  * this list of conditions and the following disclaimer.
  *
  * 2. Redistributions in binary form must reproduce the above copyright notice,
  * this list of conditions and the following disclaimer in the documentation
  * and/or other materials provided with the distribution.
  *
  * 3. Neither the name of the copyright holder nor the names of its
  * contributors may be used to endorse or promote products derived from this
  * software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  *
  * Authors: Anthony Gutierrez
  */

 #include "arch/gcn3/registers.hh"

 namespace Gcn3ISA
 {
     std::string
     opSelectorToRegSym(int idx, int numRegs)
     {
         std::string reg_sym;

         // we have an SGPR
         if (idx <= REG_SGPR_MAX) {
             if (numRegs > 1)
                 reg_sym = "s[" + std::to_string(idx) + ":" +
                     std::to_string(idx + numRegs - 1) + "]";
             else
                 reg_sym = "s" + std::to_string(idx);
             return reg_sym;
         } else if (idx >= REG_VGPR_MIN && idx <= REG_VGPR_MAX) {
             if (numRegs > 1)
                 reg_sym = "v[" + std::to_string(idx - REG_VGPR_MIN) + ":" +
                     std::to_string(idx - REG_VGPR_MIN + numRegs - 1) + "]";
             else
                 reg_sym = "v" + std::to_string(idx - REG_VGPR_MIN);
             return reg_sym;
         } else if (idx >= REG_INT_CONST_POS_MIN &&
                    idx <= REG_INT_CONST_POS_MAX) {
             reg_sym = std::to_string(idx - REG_INT_CONST_POS_MIN + 1);
             return reg_sym;
         } else if (idx >= REG_INT_CONST_NEG_MIN &&
                    idx <= REG_INT_CONST_NEG_MAX) {
             int inline_val = -1 - (idx - REG_INT_CONST_NEG_MIN);
             reg_sym = std::to_string(inline_val);
             return reg_sym;
         }

         switch (idx) {
           case REG_FLAT_SCRATCH_LO:
             reg_sym = "flat_scratch_lo";
             break;
           case REG_FLAT_SCRATCH_HI:
             reg_sym = "flat_scratch_hi";
             break;
           case REG_VCC_LO:
             reg_sym = "vcc";
             break;
           case REG_M0:
             reg_sym = "m0";
             break;
           case REG_EXEC_LO:
             reg_sym = "exec";
             break;
           case REG_ZERO:
             reg_sym = "0";
             break;
           case REG_POS_HALF:
             reg_sym = "0.5";
             break;
           case REG_NEG_HALF:
             reg_sym = "-0.5";
             break;
           case REG_POS_ONE:
             reg_sym = "1";
             break;
           case REG_NEG_ONE:
             reg_sym = "-1";
             break;
           case REG_POS_TWO:
             reg_sym = "2";
             break;
           case REG_NEG_TWO:
             reg_sym = "-2";
             break;
           case REG_POS_FOUR:
             reg_sym = "4";
             break;
           case REG_NEG_FOUR:
             reg_sym = "-4";
             break;
           default:
             fatal("GCN3 ISA instruction has unknown register index %u\n", idx);
             break;
         }

         return reg_sym;
     }

     int
     opSelectorToRegIdx(int idx, int numScalarRegs)
     {
         int regIdx = -1;

         if (idx <= REG_SGPR_MAX) {
             regIdx = idx;
         } else if (idx >= REG_VGPR_MIN && idx <= REG_VGPR_MAX) {
             regIdx = idx - REG_VGPR_MIN;
         } else if (idx == REG_VCC_LO) {
             /**
              * the VCC register occupies the two highest numbered
              * SRF entries. VCC is typically indexed by specifying
              * VCC_LO (simply called VCC) in the instruction encoding
              * and reading it as a 64b value so we only return the
              * index to the lower half of the VCC register.
              *
              * VCC_LO = s[NUM_SGPRS - 2]
              * VCC_HI = s[NUM_SGPRS - 1]
              *
              */
             regIdx = numScalarRegs - 2;
         } else if (idx == REG_FLAT_SCRATCH_LO) {
             /**
              * the FLAT_SCRATCH register occupies the two SRF entries
              * just below VCC. FLAT_SCRATCH is typically indexed by
              * specifying FLAT_SCRATCH_LO (simply called FLAT_SCRATCH)
              * in the instruction encoding and reading it as a 64b value
              * so we only return the index to the lower half of the
              * FLAT_SCRATCH register.
              *
              * FLAT_SCRATCH_LO = s[NUM_SGPRS - 4]
              * FLAT_SCRATCH_HI = s[NUM_SGPRS - 3]
              *
              */
             regIdx = numScalarRegs - 4;
         } else if (idx == REG_FLAT_SCRATCH_HI) {
             regIdx = numScalarRegs - 3;
         }

         return regIdx;
     }

     bool
     isLiteral(int opIdx)
     {
         return opIdx == REG_SRC_LITERAL;
     }

     bool
     isExecMask(int opIdx)
     {
         return opIdx == REG_EXEC_LO || opIdx == REG_EXEC_HI;
     }

     bool
     isVccReg(int opIdx)
     {
         return opIdx == REG_VCC_LO || opIdx == REG_VCC_HI;
     }

     bool
     isFlatScratchReg(int opIdx)
     {
         return opIdx == REG_FLAT_SCRATCH_LO || opIdx == REG_FLAT_SCRATCH_HI;
     }

     bool
     isScalarReg(int opIdx)
     {
         // FLAT_SCRATCH and VCC are stored in an SGPR pair
         if (opIdx <= REG_SGPR_MAX || opIdx == REG_FLAT_SCRATCH_LO ||
             opIdx == REG_FLAT_SCRATCH_HI || opIdx == REG_VCC_LO ||
             opIdx == REG_VCC_HI) {
             return true;
         }

         return false;
     }

     bool
     isVectorReg(int opIdx)
     {
         if (opIdx >= REG_VGPR_MIN && opIdx <= REG_VGPR_MAX)
             return true;

         return false;
     }

 } // namespace Gcn3ISA
	/*
	* Copyright (c) 2015-2017 Advanced Micro Devices, Inc.
	* All rights reserved.
	*
	* For use for simulation and test purposes only
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are met:
	*
	* 1. Redistributions of source code must retain the above copyright notice,
	* this list of conditions and the following disclaimer.
	*
	* 2. Redistributions in binary form must reproduce the above copyright notice,
	* this list of conditions and the following disclaimer in the documentation
	* and/or other materials provided with the distribution.
	*
	* 3. Neither the name of the copyright holder nor the names of its
	* contributors may be used to endorse or promote products derived from this
	* software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	* POSSIBILITY OF SUCH DAMAGE.
	*
	* Authors: Anthony Gutierrez
	*/

	#include "arch/gcn3/registers.hh"

	namespace Gcn3ISA
	{
	std::string
	opSelectorToRegSym(int idx, int numRegs)
	{
	std::string reg_sym;

	// we have an SGPR
	if (idx <= REG_SGPR_MAX) {
	if (numRegs > 1)
	reg_sym = "s[" + std::to_string(idx) + ":" +
	std::to_string(idx + numRegs - 1) + "]";
	else
	reg_sym = "s" + std::to_string(idx);
	return reg_sym;
	} else if (idx >= REG_VGPR_MIN && idx <= REG_VGPR_MAX) {
	if (numRegs > 1)
	reg_sym = "v[" + std::to_string(idx - REG_VGPR_MIN) + ":" +
	std::to_string(idx - REG_VGPR_MIN + numRegs - 1) + "]";
	else
	reg_sym = "v" + std::to_string(idx - REG_VGPR_MIN);
	return reg_sym;
	} else if (idx >= REG_INT_CONST_POS_MIN &&
	idx <= REG_INT_CONST_POS_MAX) {
	reg_sym = std::to_string(idx - REG_INT_CONST_POS_MIN + 1);
	return reg_sym;
	} else if (idx >= REG_INT_CONST_NEG_MIN &&
	idx <= REG_INT_CONST_NEG_MAX) {
	int inline_val = -1 - (idx - REG_INT_CONST_NEG_MIN);
	reg_sym = std::to_string(inline_val);
	return reg_sym;
	}

	switch (idx) {
	case REG_FLAT_SCRATCH_LO:
	reg_sym = "flat_scratch_lo";
	break;
	case REG_FLAT_SCRATCH_HI:
	reg_sym = "flat_scratch_hi";
	break;
	case REG_VCC_LO:
	reg_sym = "vcc";
	break;
	case REG_M0:
	reg_sym = "m0";
	break;
	case REG_EXEC_LO:
	reg_sym = "exec";
	break;
	case REG_ZERO:
	reg_sym = "0";
	break;
	case REG_POS_HALF:
	reg_sym = "0.5";
	break;
	case REG_NEG_HALF:
	reg_sym = "-0.5";
	break;
	case REG_POS_ONE:
	reg_sym = "1";
	break;
	case REG_NEG_ONE:
	reg_sym = "-1";
	break;
	case REG_POS_TWO:
	reg_sym = "2";
	break;
	case REG_NEG_TWO:
	reg_sym = "-2";
	break;
	case REG_POS_FOUR:
	reg_sym = "4";
	break;
	case REG_NEG_FOUR:
	reg_sym = "-4";
	break;
	default:
	fatal("GCN3 ISA instruction has unknown register index %u\n", idx);
	break;
	}

	return reg_sym;
	}

	int
	opSelectorToRegIdx(int idx, int numScalarRegs)
	{
	int regIdx = -1;

	if (idx <= REG_SGPR_MAX) {
	regIdx = idx;
	} else if (idx >= REG_VGPR_MIN && idx <= REG_VGPR_MAX) {
	regIdx = idx - REG_VGPR_MIN;
	} else if (idx == REG_VCC_LO) {
	/**
	* the VCC register occupies the two highest numbered
	* SRF entries. VCC is typically indexed by specifying
	* VCC_LO (simply called VCC) in the instruction encoding
	* and reading it as a 64b value so we only return the
	* index to the lower half of the VCC register.
	*
	* VCC_LO = s[NUM_SGPRS - 2]
	* VCC_HI = s[NUM_SGPRS - 1]
	*
	*/
	regIdx = numScalarRegs - 2;
	} else if (idx == REG_FLAT_SCRATCH_LO) {
	/**
	* the FLAT_SCRATCH register occupies the two SRF entries
	* just below VCC. FLAT_SCRATCH is typically indexed by
	* specifying FLAT_SCRATCH_LO (simply called FLAT_SCRATCH)
	* in the instruction encoding and reading it as a 64b value
	* so we only return the index to the lower half of the
	* FLAT_SCRATCH register.
	*
	* FLAT_SCRATCH_LO = s[NUM_SGPRS - 4]
	* FLAT_SCRATCH_HI = s[NUM_SGPRS - 3]
	*
	*/
	regIdx = numScalarRegs - 4;
	} else if (idx == REG_FLAT_SCRATCH_HI) {
	regIdx = numScalarRegs - 3;
	}

	return regIdx;
	}

	bool
	isLiteral(int opIdx)
	{
	return opIdx == REG_SRC_LITERAL;
	}

	bool
	isExecMask(int opIdx)
	{
	return opIdx == REG_EXEC_LO \|\| opIdx == REG_EXEC_HI;
	}

	bool
	isVccReg(int opIdx)
	{
	return opIdx == REG_VCC_LO \|\| opIdx == REG_VCC_HI;
	}

	bool
	isFlatScratchReg(int opIdx)
	{
	return opIdx == REG_FLAT_SCRATCH_LO \|\| opIdx == REG_FLAT_SCRATCH_HI;
	}

	bool
	isScalarReg(int opIdx)
	{
	// FLAT_SCRATCH and VCC are stored in an SGPR pair
	if (opIdx <= REG_SGPR_MAX \|\| opIdx == REG_FLAT_SCRATCH_LO \|\|
	opIdx == REG_FLAT_SCRATCH_HI \|\| opIdx == REG_VCC_LO \|\|
	opIdx == REG_VCC_HI) {
	return true;
	}

	return false;
	}

	bool
	isVectorReg(int opIdx)
	{
	if (opIdx >= REG_VGPR_MIN && opIdx <= REG_VGPR_MAX)
	return true;

	return false;
	}

	} // namespace Gcn3ISA