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Annotation of qemu/linux-user/arm/nwfpe/fpopcode.c, revision 1.1

1.1     ! root        1: /*
        !             2:     NetWinder Floating Point Emulator
        !             3:     (c) Rebel.COM, 1998,1999
        !             4: 
        !             5:     Direct questions, comments to Scott Bambrough <[email protected]>
        !             6: 
        !             7:     This program is free software; you can redistribute it and/or modify
        !             8:     it under the terms of the GNU General Public License as published by
        !             9:     the Free Software Foundation; either version 2 of the License, or
        !            10:     (at your option) any later version.
        !            11: 
        !            12:     This program is distributed in the hope that it will be useful,
        !            13:     but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            14:     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            15:     GNU General Public License for more details.
        !            16: 
        !            17:     You should have received a copy of the GNU General Public License
        !            18:     along with this program; if not, write to the Free Software
        !            19:     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
        !            20: */
        !            21: 
        !            22: #include "fpa11.h"
        !            23: #include "softfloat.h"
        !            24: #include "fpopcode.h"
        !            25: #include "fpsr.h"
        !            26: //#include "fpmodule.h"
        !            27: //#include "fpmodule.inl"
        !            28: 
        !            29: const floatx80 floatx80Constant[] = {
        !            30:   { 0x0000000000000000ULL, 0x0000},    /* extended 0.0 */
        !            31:   { 0x8000000000000000ULL, 0x3fff},    /* extended 1.0 */
        !            32:   { 0x8000000000000000ULL, 0x4000},    /* extended 2.0 */
        !            33:   { 0xc000000000000000ULL, 0x4000},    /* extended 3.0 */
        !            34:   { 0x8000000000000000ULL, 0x4001},    /* extended 4.0 */
        !            35:   { 0xa000000000000000ULL, 0x4001},    /* extended 5.0 */
        !            36:   { 0x8000000000000000ULL, 0x3ffe},    /* extended 0.5 */
        !            37:   { 0xa000000000000000ULL, 0x4002}     /* extended 10.0 */
        !            38: };
        !            39: 
        !            40: const float64 float64Constant[] = {
        !            41:   0x0000000000000000ULL,               /* double 0.0 */
        !            42:   0x3ff0000000000000ULL,               /* double 1.0 */
        !            43:   0x4000000000000000ULL,               /* double 2.0 */
        !            44:   0x4008000000000000ULL,               /* double 3.0 */
        !            45:   0x4010000000000000ULL,               /* double 4.0 */
        !            46:   0x4014000000000000ULL,               /* double 5.0 */
        !            47:   0x3fe0000000000000ULL,               /* double 0.5 */
        !            48:   0x4024000000000000ULL                        /* double 10.0 */
        !            49: };
        !            50: 
        !            51: const float32 float32Constant[] = {
        !            52:   0x00000000,                          /* single 0.0 */
        !            53:   0x3f800000,                          /* single 1.0 */
        !            54:   0x40000000,                          /* single 2.0 */
        !            55:   0x40400000,                          /* single 3.0 */
        !            56:   0x40800000,                          /* single 4.0 */
        !            57:   0x40a00000,                          /* single 5.0 */
        !            58:   0x3f000000,                          /* single 0.5 */
        !            59:   0x41200000                           /* single 10.0 */
        !            60: };
        !            61: 
        !            62: unsigned int getTransferLength(const unsigned int opcode)
        !            63: {
        !            64:   unsigned int nRc;
        !            65: 
        !            66:   switch (opcode & MASK_TRANSFER_LENGTH)
        !            67:   {
        !            68:     case 0x00000000: nRc = 1; break; /* single precision */
        !            69:     case 0x00008000: nRc = 2; break; /* double precision */
        !            70:     case 0x00400000: nRc = 3; break; /* extended precision */
        !            71:     default: nRc = 0;
        !            72:   }
        !            73: 
        !            74:   return(nRc);
        !            75: }
        !            76: 
        !            77: unsigned int getRegisterCount(const unsigned int opcode)
        !            78: {
        !            79:   unsigned int nRc;
        !            80: 
        !            81:   switch (opcode & MASK_REGISTER_COUNT)
        !            82:   {
        !            83:     case 0x00000000: nRc = 4; break;
        !            84:     case 0x00008000: nRc = 1; break;
        !            85:     case 0x00400000: nRc = 2; break;
        !            86:     case 0x00408000: nRc = 3; break;
        !            87:     default: nRc = 0;
        !            88:   }
        !            89: 
        !            90:   return(nRc);
        !            91: }
        !            92: 
        !            93: unsigned int getRoundingPrecision(const unsigned int opcode)
        !            94: {
        !            95:   unsigned int nRc;
        !            96: 
        !            97:   switch (opcode & MASK_ROUNDING_PRECISION)
        !            98:   {
        !            99:     case 0x00000000: nRc = 1; break;
        !           100:     case 0x00000080: nRc = 2; break;
        !           101:     case 0x00080000: nRc = 3; break;
        !           102:     default: nRc = 0;
        !           103:   }
        !           104: 
        !           105:   return(nRc);
        !           106: }
        !           107: 
        !           108: unsigned int getDestinationSize(const unsigned int opcode)
        !           109: {
        !           110:   unsigned int nRc;
        !           111: 
        !           112:   switch (opcode & MASK_DESTINATION_SIZE)
        !           113:   {
        !           114:     case 0x00000000: nRc = typeSingle; break;
        !           115:     case 0x00000080: nRc = typeDouble; break;
        !           116:     case 0x00080000: nRc = typeExtended; break;
        !           117:     default: nRc = typeNone;
        !           118:   }
        !           119: 
        !           120:   return(nRc);
        !           121: }
        !           122: 
        !           123: /* condition code lookup table
        !           124:  index into the table is test code: EQ, NE, ... LT, GT, AL, NV
        !           125:  bit position in short is condition code: NZCV */
        !           126: static const unsigned short aCC[16] = {
        !           127:     0xF0F0, // EQ == Z set
        !           128:     0x0F0F, // NE
        !           129:     0xCCCC, // CS == C set
        !           130:     0x3333, // CC
        !           131:     0xFF00, // MI == N set
        !           132:     0x00FF, // PL
        !           133:     0xAAAA, // VS == V set
        !           134:     0x5555, // VC
        !           135:     0x0C0C, // HI == C set && Z clear
        !           136:     0xF3F3, // LS == C clear || Z set
        !           137:     0xAA55, // GE == (N==V)
        !           138:     0x55AA, // LT == (N!=V)
        !           139:     0x0A05, // GT == (!Z && (N==V))
        !           140:     0xF5FA, // LE == (Z || (N!=V))
        !           141:     0xFFFF, // AL always
        !           142:     0 // NV
        !           143: };
        !           144: 
        !           145: unsigned int checkCondition(const unsigned int opcode, const unsigned int ccodes)
        !           146: {
        !           147:   return (aCC[opcode>>28] >> (ccodes>>28)) & 1;
        !           148: }

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