Return to cc_helper.c CVS log

Up to [Qemu by Fabrice Bellard] / qemu / target-sparc

Annotation of qemu/target-sparc/cc_helper.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Helpers for lazy condition code handling
        !             3:  *
        !             4:  *  Copyright (c) 2003-2005 Fabrice Bellard
        !             5:  *
        !             6:  * This library is free software; you can redistribute it and/or
        !             7:  * modify it under the terms of the GNU Lesser General Public
        !             8:  * License as published by the Free Software Foundation; either
        !             9:  * version 2 of the License, or (at your option) any later version.
        !            10:  *
        !            11:  * This library is distributed in the hope that it will be useful,
        !            12:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            13:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            14:  * Lesser General Public License for more details.
        !            15:  *
        !            16:  * You should have received a copy of the GNU Lesser General Public
        !            17:  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
        !            18:  */
        !            19: 
        !            20: #include "cpu.h"
        !            21: #include "helper.h"
        !            22: 
        !            23: static uint32_t compute_all_flags(CPUState *env)
        !            24: {
        !            25:     return env->psr & PSR_ICC;
        !            26: }
        !            27: 
        !            28: static uint32_t compute_C_flags(CPUState *env)
        !            29: {
        !            30:     return env->psr & PSR_CARRY;
        !            31: }
        !            32: 
        !            33: static inline uint32_t get_NZ_icc(int32_t dst)
        !            34: {
        !            35:     uint32_t ret = 0;
        !            36: 
        !            37:     if (dst == 0) {
        !            38:         ret = PSR_ZERO;
        !            39:     } else if (dst < 0) {
        !            40:         ret = PSR_NEG;
        !            41:     }
        !            42:     return ret;
        !            43: }
        !            44: 
        !            45: #ifdef TARGET_SPARC64
        !            46: static uint32_t compute_all_flags_xcc(CPUState *env)
        !            47: {
        !            48:     return env->xcc & PSR_ICC;
        !            49: }
        !            50: 
        !            51: static uint32_t compute_C_flags_xcc(CPUState *env)
        !            52: {
        !            53:     return env->xcc & PSR_CARRY;
        !            54: }
        !            55: 
        !            56: static inline uint32_t get_NZ_xcc(target_long dst)
        !            57: {
        !            58:     uint32_t ret = 0;
        !            59: 
        !            60:     if (!dst) {
        !            61:         ret = PSR_ZERO;
        !            62:     } else if (dst < 0) {
        !            63:         ret = PSR_NEG;
        !            64:     }
        !            65:     return ret;
        !            66: }
        !            67: #endif
        !            68: 
        !            69: static inline uint32_t get_V_div_icc(target_ulong src2)
        !            70: {
        !            71:     uint32_t ret = 0;
        !            72: 
        !            73:     if (src2 != 0) {
        !            74:         ret = PSR_OVF;
        !            75:     }
        !            76:     return ret;
        !            77: }
        !            78: 
        !            79: static uint32_t compute_all_div(CPUState *env)
        !            80: {
        !            81:     uint32_t ret;
        !            82: 
        !            83:     ret = get_NZ_icc(CC_DST);
        !            84:     ret |= get_V_div_icc(CC_SRC2);
        !            85:     return ret;
        !            86: }
        !            87: 
        !            88: static uint32_t compute_C_div(CPUState *env)
        !            89: {
        !            90:     return 0;
        !            91: }
        !            92: 
        !            93: static inline uint32_t get_C_add_icc(uint32_t dst, uint32_t src1)
        !            94: {
        !            95:     uint32_t ret = 0;
        !            96: 
        !            97:     if (dst < src1) {
        !            98:         ret = PSR_CARRY;
        !            99:     }
        !           100:     return ret;
        !           101: }
        !           102: 
        !           103: static inline uint32_t get_C_addx_icc(uint32_t dst, uint32_t src1,
        !           104:                                       uint32_t src2)
        !           105: {
        !           106:     uint32_t ret = 0;
        !           107: 
        !           108:     if (((src1 & src2) | (~dst & (src1 | src2))) & (1U << 31)) {
        !           109:         ret = PSR_CARRY;
        !           110:     }
        !           111:     return ret;
        !           112: }
        !           113: 
        !           114: static inline uint32_t get_V_add_icc(uint32_t dst, uint32_t src1,
        !           115:                                      uint32_t src2)
        !           116: {
        !           117:     uint32_t ret = 0;
        !           118: 
        !           119:     if (((src1 ^ src2 ^ -1) & (src1 ^ dst)) & (1U << 31)) {
        !           120:         ret = PSR_OVF;
        !           121:     }
        !           122:     return ret;
        !           123: }
        !           124: 
        !           125: #ifdef TARGET_SPARC64
        !           126: static inline uint32_t get_C_add_xcc(target_ulong dst, target_ulong src1)
        !           127: {
        !           128:     uint32_t ret = 0;
        !           129: 
        !           130:     if (dst < src1) {
        !           131:         ret = PSR_CARRY;
        !           132:     }
        !           133:     return ret;
        !           134: }
        !           135: 
        !           136: static inline uint32_t get_C_addx_xcc(target_ulong dst, target_ulong src1,
        !           137:                                       target_ulong src2)
        !           138: {
        !           139:     uint32_t ret = 0;
        !           140: 
        !           141:     if (((src1 & src2) | (~dst & (src1 | src2))) & (1ULL << 63)) {
        !           142:         ret = PSR_CARRY;
        !           143:     }
        !           144:     return ret;
        !           145: }
        !           146: 
        !           147: static inline uint32_t get_V_add_xcc(target_ulong dst, target_ulong src1,
        !           148:                                      target_ulong src2)
        !           149: {
        !           150:     uint32_t ret = 0;
        !           151: 
        !           152:     if (((src1 ^ src2 ^ -1) & (src1 ^ dst)) & (1ULL << 63)) {
        !           153:         ret = PSR_OVF;
        !           154:     }
        !           155:     return ret;
        !           156: }
        !           157: 
        !           158: static uint32_t compute_all_add_xcc(CPUState *env)
        !           159: {
        !           160:     uint32_t ret;
        !           161: 
        !           162:     ret = get_NZ_xcc(CC_DST);
        !           163:     ret |= get_C_add_xcc(CC_DST, CC_SRC);
        !           164:     ret |= get_V_add_xcc(CC_DST, CC_SRC, CC_SRC2);
        !           165:     return ret;
        !           166: }
        !           167: 
        !           168: static uint32_t compute_C_add_xcc(CPUState *env)
        !           169: {
        !           170:     return get_C_add_xcc(CC_DST, CC_SRC);
        !           171: }
        !           172: #endif
        !           173: 
        !           174: static uint32_t compute_all_add(CPUState *env)
        !           175: {
        !           176:     uint32_t ret;
        !           177: 
        !           178:     ret = get_NZ_icc(CC_DST);
        !           179:     ret |= get_C_add_icc(CC_DST, CC_SRC);
        !           180:     ret |= get_V_add_icc(CC_DST, CC_SRC, CC_SRC2);
        !           181:     return ret;
        !           182: }
        !           183: 
        !           184: static uint32_t compute_C_add(CPUState *env)
        !           185: {
        !           186:     return get_C_add_icc(CC_DST, CC_SRC);
        !           187: }
        !           188: 
        !           189: #ifdef TARGET_SPARC64
        !           190: static uint32_t compute_all_addx_xcc(CPUState *env)
        !           191: {
        !           192:     uint32_t ret;
        !           193: 
        !           194:     ret = get_NZ_xcc(CC_DST);
        !           195:     ret |= get_C_addx_xcc(CC_DST, CC_SRC, CC_SRC2);
        !           196:     ret |= get_V_add_xcc(CC_DST, CC_SRC, CC_SRC2);
        !           197:     return ret;
        !           198: }
        !           199: 
        !           200: static uint32_t compute_C_addx_xcc(CPUState *env)
        !           201: {
        !           202:     uint32_t ret;
        !           203: 
        !           204:     ret = get_C_addx_xcc(CC_DST, CC_SRC, CC_SRC2);
        !           205:     return ret;
        !           206: }
        !           207: #endif
        !           208: 
        !           209: static uint32_t compute_all_addx(CPUState *env)
        !           210: {
        !           211:     uint32_t ret;
        !           212: 
        !           213:     ret = get_NZ_icc(CC_DST);
        !           214:     ret |= get_C_addx_icc(CC_DST, CC_SRC, CC_SRC2);
        !           215:     ret |= get_V_add_icc(CC_DST, CC_SRC, CC_SRC2);
        !           216:     return ret;
        !           217: }
        !           218: 
        !           219: static uint32_t compute_C_addx(CPUState *env)
        !           220: {
        !           221:     uint32_t ret;
        !           222: 
        !           223:     ret = get_C_addx_icc(CC_DST, CC_SRC, CC_SRC2);
        !           224:     return ret;
        !           225: }
        !           226: 
        !           227: static inline uint32_t get_V_tag_icc(target_ulong src1, target_ulong src2)
        !           228: {
        !           229:     uint32_t ret = 0;
        !           230: 
        !           231:     if ((src1 | src2) & 0x3) {
        !           232:         ret = PSR_OVF;
        !           233:     }
        !           234:     return ret;
        !           235: }
        !           236: 
        !           237: static uint32_t compute_all_tadd(CPUState *env)
        !           238: {
        !           239:     uint32_t ret;
        !           240: 
        !           241:     ret = get_NZ_icc(CC_DST);
        !           242:     ret |= get_C_add_icc(CC_DST, CC_SRC);
        !           243:     ret |= get_V_add_icc(CC_DST, CC_SRC, CC_SRC2);
        !           244:     ret |= get_V_tag_icc(CC_SRC, CC_SRC2);
        !           245:     return ret;
        !           246: }
        !           247: 
        !           248: static uint32_t compute_all_taddtv(CPUState *env)
        !           249: {
        !           250:     uint32_t ret;
        !           251: 
        !           252:     ret = get_NZ_icc(CC_DST);
        !           253:     ret |= get_C_add_icc(CC_DST, CC_SRC);
        !           254:     return ret;
        !           255: }
        !           256: 
        !           257: static inline uint32_t get_C_sub_icc(uint32_t src1, uint32_t src2)
        !           258: {
        !           259:     uint32_t ret = 0;
        !           260: 
        !           261:     if (src1 < src2) {
        !           262:         ret = PSR_CARRY;
        !           263:     }
        !           264:     return ret;
        !           265: }
        !           266: 
        !           267: static inline uint32_t get_C_subx_icc(uint32_t dst, uint32_t src1,
        !           268:                                       uint32_t src2)
        !           269: {
        !           270:     uint32_t ret = 0;
        !           271: 
        !           272:     if (((~src1 & src2) | (dst & (~src1 | src2))) & (1U << 31)) {
        !           273:         ret = PSR_CARRY;
        !           274:     }
        !           275:     return ret;
        !           276: }
        !           277: 
        !           278: static inline uint32_t get_V_sub_icc(uint32_t dst, uint32_t src1,
        !           279:                                      uint32_t src2)
        !           280: {
        !           281:     uint32_t ret = 0;
        !           282: 
        !           283:     if (((src1 ^ src2) & (src1 ^ dst)) & (1U << 31)) {
        !           284:         ret = PSR_OVF;
        !           285:     }
        !           286:     return ret;
        !           287: }
        !           288: 
        !           289: 
        !           290: #ifdef TARGET_SPARC64
        !           291: static inline uint32_t get_C_sub_xcc(target_ulong src1, target_ulong src2)
        !           292: {
        !           293:     uint32_t ret = 0;
        !           294: 
        !           295:     if (src1 < src2) {
        !           296:         ret = PSR_CARRY;
        !           297:     }
        !           298:     return ret;
        !           299: }
        !           300: 
        !           301: static inline uint32_t get_C_subx_xcc(target_ulong dst, target_ulong src1,
        !           302:                                       target_ulong src2)
        !           303: {
        !           304:     uint32_t ret = 0;
        !           305: 
        !           306:     if (((~src1 & src2) | (dst & (~src1 | src2))) & (1ULL << 63)) {
        !           307:         ret = PSR_CARRY;
        !           308:     }
        !           309:     return ret;
        !           310: }
        !           311: 
        !           312: static inline uint32_t get_V_sub_xcc(target_ulong dst, target_ulong src1,
        !           313:                                      target_ulong src2)
        !           314: {
        !           315:     uint32_t ret = 0;
        !           316: 
        !           317:     if (((src1 ^ src2) & (src1 ^ dst)) & (1ULL << 63)) {
        !           318:         ret = PSR_OVF;
        !           319:     }
        !           320:     return ret;
        !           321: }
        !           322: 
        !           323: static uint32_t compute_all_sub_xcc(CPUState *env)
        !           324: {
        !           325:     uint32_t ret;
        !           326: 
        !           327:     ret = get_NZ_xcc(CC_DST);
        !           328:     ret |= get_C_sub_xcc(CC_SRC, CC_SRC2);
        !           329:     ret |= get_V_sub_xcc(CC_DST, CC_SRC, CC_SRC2);
        !           330:     return ret;
        !           331: }
        !           332: 
        !           333: static uint32_t compute_C_sub_xcc(CPUState *env)
        !           334: {
        !           335:     return get_C_sub_xcc(CC_SRC, CC_SRC2);
        !           336: }
        !           337: #endif
        !           338: 
        !           339: static uint32_t compute_all_sub(CPUState *env)
        !           340: {
        !           341:     uint32_t ret;
        !           342: 
        !           343:     ret = get_NZ_icc(CC_DST);
        !           344:     ret |= get_C_sub_icc(CC_SRC, CC_SRC2);
        !           345:     ret |= get_V_sub_icc(CC_DST, CC_SRC, CC_SRC2);
        !           346:     return ret;
        !           347: }
        !           348: 
        !           349: static uint32_t compute_C_sub(CPUState *env)
        !           350: {
        !           351:     return get_C_sub_icc(CC_SRC, CC_SRC2);
        !           352: }
        !           353: 
        !           354: #ifdef TARGET_SPARC64
        !           355: static uint32_t compute_all_subx_xcc(CPUState *env)
        !           356: {
        !           357:     uint32_t ret;
        !           358: 
        !           359:     ret = get_NZ_xcc(CC_DST);
        !           360:     ret |= get_C_subx_xcc(CC_DST, CC_SRC, CC_SRC2);
        !           361:     ret |= get_V_sub_xcc(CC_DST, CC_SRC, CC_SRC2);
        !           362:     return ret;
        !           363: }
        !           364: 
        !           365: static uint32_t compute_C_subx_xcc(CPUState *env)
        !           366: {
        !           367:     uint32_t ret;
        !           368: 
        !           369:     ret = get_C_subx_xcc(CC_DST, CC_SRC, CC_SRC2);
        !           370:     return ret;
        !           371: }
        !           372: #endif
        !           373: 
        !           374: static uint32_t compute_all_subx(CPUState *env)
        !           375: {
        !           376:     uint32_t ret;
        !           377: 
        !           378:     ret = get_NZ_icc(CC_DST);
        !           379:     ret |= get_C_subx_icc(CC_DST, CC_SRC, CC_SRC2);
        !           380:     ret |= get_V_sub_icc(CC_DST, CC_SRC, CC_SRC2);
        !           381:     return ret;
        !           382: }
        !           383: 
        !           384: static uint32_t compute_C_subx(CPUState *env)
        !           385: {
        !           386:     uint32_t ret;
        !           387: 
        !           388:     ret = get_C_subx_icc(CC_DST, CC_SRC, CC_SRC2);
        !           389:     return ret;
        !           390: }
        !           391: 
        !           392: static uint32_t compute_all_tsub(CPUState *env)
        !           393: {
        !           394:     uint32_t ret;
        !           395: 
        !           396:     ret = get_NZ_icc(CC_DST);
        !           397:     ret |= get_C_sub_icc(CC_SRC, CC_SRC2);
        !           398:     ret |= get_V_sub_icc(CC_DST, CC_SRC, CC_SRC2);
        !           399:     ret |= get_V_tag_icc(CC_SRC, CC_SRC2);
        !           400:     return ret;
        !           401: }
        !           402: 
        !           403: static uint32_t compute_all_tsubtv(CPUState *env)
        !           404: {
        !           405:     uint32_t ret;
        !           406: 
        !           407:     ret = get_NZ_icc(CC_DST);
        !           408:     ret |= get_C_sub_icc(CC_SRC, CC_SRC2);
        !           409:     return ret;
        !           410: }
        !           411: 
        !           412: static uint32_t compute_all_logic(CPUState *env)
        !           413: {
        !           414:     return get_NZ_icc(CC_DST);
        !           415: }
        !           416: 
        !           417: static uint32_t compute_C_logic(CPUState *env)
        !           418: {
        !           419:     return 0;
        !           420: }
        !           421: 
        !           422: #ifdef TARGET_SPARC64
        !           423: static uint32_t compute_all_logic_xcc(CPUState *env)
        !           424: {
        !           425:     return get_NZ_xcc(CC_DST);
        !           426: }
        !           427: #endif
        !           428: 
        !           429: typedef struct CCTable {
        !           430:     uint32_t (*compute_all)(CPUState *env); /* return all the flags */
        !           431:     uint32_t (*compute_c)(CPUState *env);  /* return the C flag */
        !           432: } CCTable;
        !           433: 
        !           434: static const CCTable icc_table[CC_OP_NB] = {
        !           435:     /* CC_OP_DYNAMIC should never happen */
        !           436:     [CC_OP_FLAGS] = { compute_all_flags, compute_C_flags },
        !           437:     [CC_OP_DIV] = { compute_all_div, compute_C_div },
        !           438:     [CC_OP_ADD] = { compute_all_add, compute_C_add },
        !           439:     [CC_OP_ADDX] = { compute_all_addx, compute_C_addx },
        !           440:     [CC_OP_TADD] = { compute_all_tadd, compute_C_add },
        !           441:     [CC_OP_TADDTV] = { compute_all_taddtv, compute_C_add },
        !           442:     [CC_OP_SUB] = { compute_all_sub, compute_C_sub },
        !           443:     [CC_OP_SUBX] = { compute_all_subx, compute_C_subx },
        !           444:     [CC_OP_TSUB] = { compute_all_tsub, compute_C_sub },
        !           445:     [CC_OP_TSUBTV] = { compute_all_tsubtv, compute_C_sub },
        !           446:     [CC_OP_LOGIC] = { compute_all_logic, compute_C_logic },
        !           447: };
        !           448: 
        !           449: #ifdef TARGET_SPARC64
        !           450: static const CCTable xcc_table[CC_OP_NB] = {
        !           451:     /* CC_OP_DYNAMIC should never happen */
        !           452:     [CC_OP_FLAGS] = { compute_all_flags_xcc, compute_C_flags_xcc },
        !           453:     [CC_OP_DIV] = { compute_all_logic_xcc, compute_C_logic },
        !           454:     [CC_OP_ADD] = { compute_all_add_xcc, compute_C_add_xcc },
        !           455:     [CC_OP_ADDX] = { compute_all_addx_xcc, compute_C_addx_xcc },
        !           456:     [CC_OP_TADD] = { compute_all_add_xcc, compute_C_add_xcc },
        !           457:     [CC_OP_TADDTV] = { compute_all_add_xcc, compute_C_add_xcc },
        !           458:     [CC_OP_SUB] = { compute_all_sub_xcc, compute_C_sub_xcc },
        !           459:     [CC_OP_SUBX] = { compute_all_subx_xcc, compute_C_subx_xcc },
        !           460:     [CC_OP_TSUB] = { compute_all_sub_xcc, compute_C_sub_xcc },
        !           461:     [CC_OP_TSUBTV] = { compute_all_sub_xcc, compute_C_sub_xcc },
        !           462:     [CC_OP_LOGIC] = { compute_all_logic_xcc, compute_C_logic },
        !           463: };
        !           464: #endif
        !           465: 
        !           466: void helper_compute_psr(CPUState *env)
        !           467: {
        !           468:     uint32_t new_psr;
        !           469: 
        !           470:     new_psr = icc_table[CC_OP].compute_all(env);
        !           471:     env->psr = new_psr;
        !           472: #ifdef TARGET_SPARC64
        !           473:     new_psr = xcc_table[CC_OP].compute_all(env);
        !           474:     env->xcc = new_psr;
        !           475: #endif
        !           476:     CC_OP = CC_OP_FLAGS;
        !           477: }
        !           478: 
        !           479: uint32_t helper_compute_C_icc(CPUState *env)
        !           480: {
        !           481:     uint32_t ret;
        !           482: 
        !           483:     ret = icc_table[CC_OP].compute_c(env) >> PSR_CARRY_SHIFT;
        !           484:     return ret;
        !           485: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.