diff options
author | Laurent Vivier <laurent@vivier.eu> | 2018-03-05 21:39:09 +0100 |
---|---|---|
committer | Laurent Vivier <laurent@vivier.eu> | 2018-03-09 15:50:38 +0100 |
commit | 068f161536d9a28a5bc482f3de9c387b2fe5908d (patch) | |
tree | 8a44910b9af7dd43d2752512477f309613519202 /target/m68k | |
parent | 40ad087330bee5394c9e78c97f909f580be69b58 (diff) |
target/m68k: implement ftwotox
Using a local m68k floatx80_twotox()
[copied from previous:
Written by Andreas Grabher for Previous, NeXT Computer Emulator.]
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20180305203910.10391-8-laurent@vivier.eu>
Diffstat (limited to 'target/m68k')
-rw-r--r-- | target/m68k/fpu_helper.c | 5 | ||||
-rw-r--r-- | target/m68k/helper.h | 1 | ||||
-rw-r--r-- | target/m68k/softfloat.c | 148 | ||||
-rw-r--r-- | target/m68k/softfloat.h | 1 | ||||
-rw-r--r-- | target/m68k/softfloat_fpsp_tables.h | 86 | ||||
-rw-r--r-- | target/m68k/translate.c | 3 |
6 files changed, 244 insertions, 0 deletions
diff --git a/target/m68k/fpu_helper.c b/target/m68k/fpu_helper.c index 154666cbb5..f488a92ab2 100644 --- a/target/m68k/fpu_helper.c +++ b/target/m68k/fpu_helper.c @@ -582,3 +582,8 @@ void HELPER(fetox)(CPUM68KState *env, FPReg *res, FPReg *val) { res->d = floatx80_etox(val->d, &env->fp_status); } + +void HELPER(ftwotox)(CPUM68KState *env, FPReg *res, FPReg *val) +{ + res->d = floatx80_twotox(val->d, &env->fp_status); +} diff --git a/target/m68k/helper.h b/target/m68k/helper.h index 70aeb2da7c..8caa82296d 100644 --- a/target/m68k/helper.h +++ b/target/m68k/helper.h @@ -73,6 +73,7 @@ DEF_HELPER_3(flogn, void, env, fp, fp) DEF_HELPER_3(flog10, void, env, fp, fp) DEF_HELPER_3(flog2, void, env, fp, fp) DEF_HELPER_3(fetox, void, env, fp, fp) +DEF_HELPER_3(ftwotox, void, env, fp, fp) DEF_HELPER_3(mac_move, void, env, i32, i32) DEF_HELPER_3(macmulf, i64, env, i32, i32) diff --git a/target/m68k/softfloat.c b/target/m68k/softfloat.c index e58eb91738..cfff30d359 100644 --- a/target/m68k/softfloat.c +++ b/target/m68k/softfloat.c @@ -965,3 +965,151 @@ floatx80 floatx80_etox(floatx80 a, float_status *status) return a; } } + +/*---------------------------------------------------------------------------- + | 2 to x + *----------------------------------------------------------------------------*/ + +floatx80 floatx80_twotox(floatx80 a, float_status *status) +{ + flag aSign; + int32_t aExp; + uint64_t aSig; + + int8_t user_rnd_mode, user_rnd_prec; + + int32_t compact, n, j, l, m, m1; + floatx80 fp0, fp1, fp2, fp3, adjfact, fact1, fact2; + + aSig = extractFloatx80Frac(a); + aExp = extractFloatx80Exp(a); + aSign = extractFloatx80Sign(a); + + if (aExp == 0x7FFF) { + if ((uint64_t) (aSig << 1)) { + return propagateFloatx80NaNOneArg(a, status); + } + if (aSign) { + return packFloatx80(0, 0, 0); + } + return packFloatx80(0, floatx80_infinity.high, + floatx80_infinity.low); + } + + if (aExp == 0 && aSig == 0) { + return packFloatx80(0, one_exp, one_sig); + } + + user_rnd_mode = status->float_rounding_mode; + user_rnd_prec = status->floatx80_rounding_precision; + status->float_rounding_mode = float_round_nearest_even; + status->floatx80_rounding_precision = 80; + + fp0 = a; + + compact = floatx80_make_compact(aExp, aSig); + + if (compact < 0x3FB98000 || compact > 0x400D80C0) { + /* |X| > 16480 or |X| < 2^(-70) */ + if (compact > 0x3FFF8000) { /* |X| > 16480 */ + status->float_rounding_mode = user_rnd_mode; + status->floatx80_rounding_precision = user_rnd_prec; + + if (aSign) { + return roundAndPackFloatx80(status->floatx80_rounding_precision, + 0, -0x1000, aSig, 0, status); + } else { + return roundAndPackFloatx80(status->floatx80_rounding_precision, + 0, 0x8000, aSig, 0, status); + } + } else { /* |X| < 2^(-70) */ + status->float_rounding_mode = user_rnd_mode; + status->floatx80_rounding_precision = user_rnd_prec; + + a = floatx80_add(fp0, float32_to_floatx80( + make_float32(0x3F800000), status), + status); /* 1 + X */ + + float_raise(float_flag_inexact, status); + + return a; + } + } else { /* 2^(-70) <= |X| <= 16480 */ + fp1 = fp0; /* X */ + fp1 = floatx80_mul(fp1, float32_to_floatx80( + make_float32(0x42800000), status), + status); /* X * 64 */ + n = floatx80_to_int32(fp1, status); + fp1 = int32_to_floatx80(n, status); + j = n & 0x3F; + l = n / 64; /* NOTE: this is really arithmetic right shift by 6 */ + if (n < 0 && j) { + /* arithmetic right shift is division and + * round towards minus infinity + */ + l--; + } + m = l / 2; /* NOTE: this is really arithmetic right shift by 1 */ + if (l < 0 && (l & 1)) { + /* arithmetic right shift is division and + * round towards minus infinity + */ + m--; + } + m1 = l - m; + m1 += 0x3FFF; /* ADJFACT IS 2^(M') */ + + adjfact = packFloatx80(0, m1, one_sig); + fact1 = exp2_tbl[j]; + fact1.high += m; + fact2.high = exp2_tbl2[j] >> 16; + fact2.high += m; + fact2.low = (uint64_t)(exp2_tbl2[j] & 0xFFFF); + fact2.low <<= 48; + + fp1 = floatx80_mul(fp1, float32_to_floatx80( + make_float32(0x3C800000), status), + status); /* (1/64)*N */ + fp0 = floatx80_sub(fp0, fp1, status); /* X - (1/64)*INT(64 X) */ + fp2 = packFloatx80(0, 0x3FFE, LIT64(0xB17217F7D1CF79AC)); /* LOG2 */ + fp0 = floatx80_mul(fp0, fp2, status); /* R */ + + /* EXPR */ + fp1 = floatx80_mul(fp0, fp0, status); /* S = R*R */ + fp2 = float64_to_floatx80(make_float64(0x3F56C16D6F7BD0B2), + status); /* A5 */ + fp3 = float64_to_floatx80(make_float64(0x3F811112302C712C), + status); /* A4 */ + fp2 = floatx80_mul(fp2, fp1, status); /* S*A5 */ + fp3 = floatx80_mul(fp3, fp1, status); /* S*A4 */ + fp2 = floatx80_add(fp2, float64_to_floatx80( + make_float64(0x3FA5555555554CC1), status), + status); /* A3+S*A5 */ + fp3 = floatx80_add(fp3, float64_to_floatx80( + make_float64(0x3FC5555555554A54), status), + status); /* A2+S*A4 */ + fp2 = floatx80_mul(fp2, fp1, status); /* S*(A3+S*A5) */ + fp3 = floatx80_mul(fp3, fp1, status); /* S*(A2+S*A4) */ + fp2 = floatx80_add(fp2, float64_to_floatx80( + make_float64(0x3FE0000000000000), status), + status); /* A1+S*(A3+S*A5) */ + fp3 = floatx80_mul(fp3, fp0, status); /* R*S*(A2+S*A4) */ + + fp2 = floatx80_mul(fp2, fp1, status); /* S*(A1+S*(A3+S*A5)) */ + fp0 = floatx80_add(fp0, fp3, status); /* R+R*S*(A2+S*A4) */ + fp0 = floatx80_add(fp0, fp2, status); /* EXP(R) - 1 */ + + fp0 = floatx80_mul(fp0, fact1, status); + fp0 = floatx80_add(fp0, fact2, status); + fp0 = floatx80_add(fp0, fact1, status); + + status->float_rounding_mode = user_rnd_mode; + status->floatx80_rounding_precision = user_rnd_prec; + + a = floatx80_mul(fp0, adjfact, status); + + float_raise(float_flag_inexact, status); + + return a; + } +} diff --git a/target/m68k/softfloat.h b/target/m68k/softfloat.h index 250f0d926f..964275d2a5 100644 --- a/target/m68k/softfloat.h +++ b/target/m68k/softfloat.h @@ -32,4 +32,5 @@ floatx80 floatx80_logn(floatx80 a, float_status *status); floatx80 floatx80_log10(floatx80 a, float_status *status); floatx80 floatx80_log2(floatx80 a, float_status *status); floatx80 floatx80_etox(floatx80 a, float_status *status); +floatx80 floatx80_twotox(floatx80 a, float_status *status); #endif diff --git a/target/m68k/softfloat_fpsp_tables.h b/target/m68k/softfloat_fpsp_tables.h index b2b63e5ced..dd76dc0373 100644 --- a/target/m68k/softfloat_fpsp_tables.h +++ b/target/m68k/softfloat_fpsp_tables.h @@ -285,4 +285,90 @@ static const float32 exp_tbl2[64] = { const_float32(0xA041ED22), const_float32(0x1F853F3A), }; + +static const floatx80 exp2_tbl[64] = { + make_floatx80_init(0x3FFF, 0x8000000000000000), + make_floatx80_init(0x3FFF, 0x8164D1F3BC030773), + make_floatx80_init(0x3FFF, 0x82CD8698AC2BA1D7), + make_floatx80_init(0x3FFF, 0x843A28C3ACDE4046), + make_floatx80_init(0x3FFF, 0x85AAC367CC487B15), + make_floatx80_init(0x3FFF, 0x871F61969E8D1010), + make_floatx80_init(0x3FFF, 0x88980E8092DA8527), + make_floatx80_init(0x3FFF, 0x8A14D575496EFD9A), + make_floatx80_init(0x3FFF, 0x8B95C1E3EA8BD6E7), + make_floatx80_init(0x3FFF, 0x8D1ADF5B7E5BA9E6), + make_floatx80_init(0x3FFF, 0x8EA4398B45CD53C0), + make_floatx80_init(0x3FFF, 0x9031DC431466B1DC), + make_floatx80_init(0x3FFF, 0x91C3D373AB11C336), + make_floatx80_init(0x3FFF, 0x935A2B2F13E6E92C), + make_floatx80_init(0x3FFF, 0x94F4EFA8FEF70961), + make_floatx80_init(0x3FFF, 0x96942D3720185A00), + make_floatx80_init(0x3FFF, 0x9837F0518DB8A96F), + make_floatx80_init(0x3FFF, 0x99E0459320B7FA65), + make_floatx80_init(0x3FFF, 0x9B8D39B9D54E5539), + make_floatx80_init(0x3FFF, 0x9D3ED9A72CFFB751), + make_floatx80_init(0x3FFF, 0x9EF5326091A111AE), + make_floatx80_init(0x3FFF, 0xA0B0510FB9714FC2), + make_floatx80_init(0x3FFF, 0xA27043030C496819), + make_floatx80_init(0x3FFF, 0xA43515AE09E6809E), + make_floatx80_init(0x3FFF, 0xA5FED6A9B15138EA), + make_floatx80_init(0x3FFF, 0xA7CD93B4E965356A), + make_floatx80_init(0x3FFF, 0xA9A15AB4EA7C0EF8), + make_floatx80_init(0x3FFF, 0xAB7A39B5A93ED337), + make_floatx80_init(0x3FFF, 0xAD583EEA42A14AC6), + make_floatx80_init(0x3FFF, 0xAF3B78AD690A4375), + make_floatx80_init(0x3FFF, 0xB123F581D2AC2590), + make_floatx80_init(0x3FFF, 0xB311C412A9112489), + make_floatx80_init(0x3FFF, 0xB504F333F9DE6484), + make_floatx80_init(0x3FFF, 0xB6FD91E328D17791), + make_floatx80_init(0x3FFF, 0xB8FBAF4762FB9EE9), + make_floatx80_init(0x3FFF, 0xBAFF5AB2133E45FB), + make_floatx80_init(0x3FFF, 0xBD08A39F580C36BF), + make_floatx80_init(0x3FFF, 0xBF1799B67A731083), + make_floatx80_init(0x3FFF, 0xC12C4CCA66709456), + make_floatx80_init(0x3FFF, 0xC346CCDA24976407), + make_floatx80_init(0x3FFF, 0xC5672A115506DADD), + make_floatx80_init(0x3FFF, 0xC78D74C8ABB9B15D), + make_floatx80_init(0x3FFF, 0xC9B9BD866E2F27A3), + make_floatx80_init(0x3FFF, 0xCBEC14FEF2727C5D), + make_floatx80_init(0x3FFF, 0xCE248C151F8480E4), + make_floatx80_init(0x3FFF, 0xD06333DAEF2B2595), + make_floatx80_init(0x3FFF, 0xD2A81D91F12AE45A), + make_floatx80_init(0x3FFF, 0xD4F35AABCFEDFA1F), + make_floatx80_init(0x3FFF, 0xD744FCCAD69D6AF4), + make_floatx80_init(0x3FFF, 0xD99D15C278AFD7B6), + make_floatx80_init(0x3FFF, 0xDBFBB797DAF23755), + make_floatx80_init(0x3FFF, 0xDE60F4825E0E9124), + make_floatx80_init(0x3FFF, 0xE0CCDEEC2A94E111), + make_floatx80_init(0x3FFF, 0xE33F8972BE8A5A51), + make_floatx80_init(0x3FFF, 0xE5B906E77C8348A8), + make_floatx80_init(0x3FFF, 0xE8396A503C4BDC68), + make_floatx80_init(0x3FFF, 0xEAC0C6E7DD24392F), + make_floatx80_init(0x3FFF, 0xED4F301ED9942B84), + make_floatx80_init(0x3FFF, 0xEFE4B99BDCDAF5CB), + make_floatx80_init(0x3FFF, 0xF281773C59FFB13A), + make_floatx80_init(0x3FFF, 0xF5257D152486CC2C), + make_floatx80_init(0x3FFF, 0xF7D0DF730AD13BB9), + make_floatx80_init(0x3FFF, 0xFA83B2DB722A033A), + make_floatx80_init(0x3FFF, 0xFD3E0C0CF486C175) +}; + +static const uint32_t exp2_tbl2[64] = { + 0x3F738000, 0x3FBEF7CA, 0x3FBDF8A9, 0x3FBCD7C9, + 0xBFBDE8DA, 0x3FBDE85C, 0x3FBEBBF1, 0x3FBB80CA, + 0xBFBA8373, 0xBFBE9670, 0x3FBDB700, 0x3FBEEEB0, + 0x3FBBFD6D, 0xBFBDB319, 0x3FBDBA2B, 0x3FBE91D5, + 0x3FBE8D5A, 0xBFBCDE7B, 0xBFBEBAAF, 0xBFBD86DA, + 0xBFBEBEDD, 0x3FBCC96E, 0xBFBEC90B, 0x3FBBD1DB, + 0x3FBCE5EB, 0xBFBEC274, 0x3FBEA83C, 0x3FBECB00, + 0x3FBE9301, 0xBFBD8367, 0xBFBEF05F, 0x3FBDFB3C, + 0x3FBEB2FB, 0x3FBAE2CB, 0x3FBCDC3C, 0x3FBEE9AA, + 0xBFBEAEFD, 0xBFBCBF51, 0x3FBEF88A, 0x3FBD83B2, + 0x3FBDF8AB, 0xBFBDFB17, 0xBFBEFE3C, 0xBFBBB6F8, + 0xBFBCEE53, 0xBFBDA4AE, 0x3FBC9124, 0x3FBEB243, + 0x3FBDE69A, 0xBFB8BC61, 0x3FBDF610, 0xBFBD8BE1, + 0x3FBACB12, 0x3FBB9BFE, 0x3FBCF2F4, 0x3FBEF22F, + 0xBFBDBF4A, 0x3FBEC01A, 0x3FBE8CAC, 0xBFBCBB3F, + 0x3FBEF73A, 0xBFB8B795, 0x3FBEF84B, 0xBFBEF581 +}; #endif diff --git a/target/m68k/translate.c b/target/m68k/translate.c index 4774310ded..c65c82e258 100644 --- a/target/m68k/translate.c +++ b/target/m68k/translate.c @@ -5060,6 +5060,9 @@ DISAS_INSN(fpu) case 0x10: /* fetox */ gen_helper_fetox(cpu_env, cpu_dest, cpu_src); break; + case 0x11: /* ftwotox */ + gen_helper_ftwotox(cpu_env, cpu_dest, cpu_src); + break; case 0x14: /* flogn */ gen_helper_flogn(cpu_env, cpu_dest, cpu_src); break; |