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target/m68k: implement fetox 

Using a local m68k floatx80_etox()
[copied from previous:
Written by Andreas Grabher for Previous, NeXT Computer Emulator.]

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20180305203910.10391-7-laurent@vivier.eu>
master
Laurent Vivier 2018-03-05 21:39:08 +01:00
parent 67b453ed73
commit 40ad087330
6 changed files with 327 additions and 0 deletions
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5
target/m68k/fpu_helper.c
View File

@ -577,3 +577,8 @@ void HELPER(flog2)(CPUM68KState *env, FPReg *res, FPReg *val)
{
res->d = floatx80_log2(val->d, &env->fp_status);
}
void HELPER(fetox)(CPUM68KState *env, FPReg *res, FPReg *val)
{
res->d = floatx80_etox(val->d, &env->fp_status);
}

1
target/m68k/helper.h
View File

@ -72,6 +72,7 @@ DEF_HELPER_3(flognp1, void, env, fp, fp)
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(mac_move, void, env, i32, i32)
DEF_HELPER_3(macmulf, i64, env, i32, i32)

183
target/m68k/softfloat.c
View File

@ -782,3 +782,186 @@ floatx80 floatx80_log2(floatx80 a, float_status *status)
return a;
}
/*----------------------------------------------------------------------------
| e to x
*----------------------------------------------------------------------------*/
floatx80 floatx80_etox(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, k, m, m1;
floatx80 fp0, fp1, fp2, fp3, l2, scale, adjscale;
flag adjflag;
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;
adjflag = 0;
if (aExp >= 0x3FBE) { /* |X| >= 2^(-65) */
compact = floatx80_make_compact(aExp, aSig);
if (compact < 0x400CB167) { /* |X| < 16380 log2 */
fp0 = a;
fp1 = a;
fp0 = floatx80_mul(fp0, float32_to_floatx80(
make_float32(0x42B8AA3B), status),
status); /* 64/log2 * X */
adjflag = 0;
n = floatx80_to_int32(fp0, status); /* int(64/log2*X) */
fp0 = int32_to_floatx80(n, status);
j = n & 0x3F; /* J = N mod 64 */
m = 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
*/
m--;
}
m += 0x3FFF; /* biased exponent of 2^(M) */
expcont1:
fp2 = fp0; /* N */
fp0 = floatx80_mul(fp0, float32_to_floatx80(
make_float32(0xBC317218), status),
status); /* N * L1, L1 = lead(-log2/64) */
l2 = packFloatx80(0, 0x3FDC, LIT64(0x82E308654361C4C6));
fp2 = floatx80_mul(fp2, l2, status); /* N * L2, L1+L2 = -log2/64 */
fp0 = floatx80_add(fp0, fp1, status); /* X + N*L1 */
fp0 = floatx80_add(fp0, fp2, status); /* R */
fp1 = floatx80_mul(fp0, fp0, status); /* S = R*R */
fp2 = float32_to_floatx80(make_float32(0x3AB60B70),
status); /* A5 */
fp2 = floatx80_mul(fp2, fp1, status); /* fp2 is S*A5 */
fp3 = floatx80_mul(float32_to_floatx80(make_float32(0x3C088895),
status), fp1,
status); /* fp3 is S*A4 */
fp2 = floatx80_add(fp2, float64_to_floatx80(make_float64(
0x3FA5555555554431), status),
status); /* fp2 is A3+S*A5 */
fp3 = floatx80_add(fp3, float64_to_floatx80(make_float64(
0x3FC5555555554018), status),
status); /* fp3 is A2+S*A4 */
fp2 = floatx80_mul(fp2, fp1, status); /* fp2 is S*(A3+S*A5) */
fp3 = floatx80_mul(fp3, fp1, status); /* fp3 is S*(A2+S*A4) */
fp2 = floatx80_add(fp2, float32_to_floatx80(
make_float32(0x3F000000), status),
status); /* fp2 is A1+S*(A3+S*A5) */
fp3 = floatx80_mul(fp3, fp0, status); /* fp3 IS R*S*(A2+S*A4) */
fp2 = floatx80_mul(fp2, fp1,
status); /* fp2 IS S*(A1+S*(A3+S*A5)) */
fp0 = floatx80_add(fp0, fp3, status); /* fp0 IS R+R*S*(A2+S*A4) */
fp0 = floatx80_add(fp0, fp2, status); /* fp0 IS EXP(R) - 1 */
fp1 = exp_tbl[j];
fp0 = floatx80_mul(fp0, fp1, status); /* 2^(J/64)*(Exp(R)-1) */
fp0 = floatx80_add(fp0, float32_to_floatx80(exp_tbl2[j], status),
status); /* accurate 2^(J/64) */
fp0 = floatx80_add(fp0, fp1,
status); /* 2^(J/64) + 2^(J/64)*(Exp(R)-1) */
scale = packFloatx80(0, m, one_sig);
if (adjflag) {
adjscale = packFloatx80(0, m1, one_sig);
fp0 = floatx80_mul(fp0, adjscale, status);
}
status->float_rounding_mode = user_rnd_mode;
status->floatx80_rounding_precision = user_rnd_prec;
a = floatx80_mul(fp0, scale, status);
float_raise(float_flag_inexact, status);
return a;
} else { /* |X| >= 16380 log2 */
if (compact > 0x400CB27C) { /* |X| >= 16480 log2 */
status->float_rounding_mode = user_rnd_mode;
status->floatx80_rounding_precision = user_rnd_prec;
if (aSign) {
a = roundAndPackFloatx80(
status->floatx80_rounding_precision,
0, -0x1000, aSig, 0, status);
} else {
a = roundAndPackFloatx80(
status->floatx80_rounding_precision,
0, 0x8000, aSig, 0, status);
}
float_raise(float_flag_inexact, status);
return a;
} else {
fp0 = a;
fp1 = a;
fp0 = floatx80_mul(fp0, float32_to_floatx80(
make_float32(0x42B8AA3B), status),
status); /* 64/log2 * X */
adjflag = 1;
n = floatx80_to_int32(fp0, status); /* int(64/log2*X) */
fp0 = int32_to_floatx80(n, status);
j = n & 0x3F; /* J = N mod 64 */
/* NOTE: this is really arithmetic right shift by 6 */
k = n / 64;
if (n < 0 && j) {
/* arithmetic right shift is division and
* round towards minus infinity
*/
k--;
}
/* NOTE: this is really arithmetic right shift by 1 */
m1 = k / 2;
if (k < 0 && (k & 1)) {
/* arithmetic right shift is division and
* round towards minus infinity
*/
m1--;
}
m = k - m1;
m1 += 0x3FFF; /* biased exponent of 2^(M1) */
m += 0x3FFF; /* biased exponent of 2^(M) */
goto expcont1;
}
}
} else { /* |X| < 2^(-65) */
status->float_rounding_mode = user_rnd_mode;
status->floatx80_rounding_precision = user_rnd_prec;
a = floatx80_add(a, float32_to_floatx80(make_float32(0x3F800000),
status), status); /* 1 + X */
float_raise(float_flag_inexact, status);
return a;
}
}

1
target/m68k/softfloat.h
View File

@ -31,4 +31,5 @@ floatx80 floatx80_lognp1(floatx80 a, float_status *status);
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);
#endif

134
target/m68k/softfloat_fpsp_tables.h
View File

@ -151,4 +151,138 @@ static const floatx80 log_tbl[128] = {
make_floatx80_init(0x3FFE, 0x8080808080808081),
make_floatx80_init(0x3FFE, 0xB07197A23C46C654)
};
static const floatx80 exp_tbl[64] = {
make_floatx80_init(0x3FFF, 0x8000000000000000),
make_floatx80_init(0x3FFF, 0x8164D1F3BC030774),
make_floatx80_init(0x3FFF, 0x82CD8698AC2BA1D8),
make_floatx80_init(0x3FFF, 0x843A28C3ACDE4048),
make_floatx80_init(0x3FFF, 0x85AAC367CC487B14),
make_floatx80_init(0x3FFF, 0x871F61969E8D1010),
make_floatx80_init(0x3FFF, 0x88980E8092DA8528),
make_floatx80_init(0x3FFF, 0x8A14D575496EFD9C),
make_floatx80_init(0x3FFF, 0x8B95C1E3EA8BD6E8),
make_floatx80_init(0x3FFF, 0x8D1ADF5B7E5BA9E4),
make_floatx80_init(0x3FFF, 0x8EA4398B45CD53C0),
make_floatx80_init(0x3FFF, 0x9031DC431466B1DC),
make_floatx80_init(0x3FFF, 0x91C3D373AB11C338),
make_floatx80_init(0x3FFF, 0x935A2B2F13E6E92C),
make_floatx80_init(0x3FFF, 0x94F4EFA8FEF70960),
make_floatx80_init(0x3FFF, 0x96942D3720185A00),
make_floatx80_init(0x3FFF, 0x9837F0518DB8A970),
make_floatx80_init(0x3FFF, 0x99E0459320B7FA64),
make_floatx80_init(0x3FFF, 0x9B8D39B9D54E5538),
make_floatx80_init(0x3FFF, 0x9D3ED9A72CFFB750),
make_floatx80_init(0x3FFF, 0x9EF5326091A111AC),
make_floatx80_init(0x3FFF, 0xA0B0510FB9714FC4),
make_floatx80_init(0x3FFF, 0xA27043030C496818),
make_floatx80_init(0x3FFF, 0xA43515AE09E680A0),
make_floatx80_init(0x3FFF, 0xA5FED6A9B15138EC),
make_floatx80_init(0x3FFF, 0xA7CD93B4E9653568),
make_floatx80_init(0x3FFF, 0xA9A15AB4EA7C0EF8),
make_floatx80_init(0x3FFF, 0xAB7A39B5A93ED338),
make_floatx80_init(0x3FFF, 0xAD583EEA42A14AC8),
make_floatx80_init(0x3FFF, 0xAF3B78AD690A4374),
make_floatx80_init(0x3FFF, 0xB123F581D2AC2590),
make_floatx80_init(0x3FFF, 0xB311C412A9112488),
make_floatx80_init(0x3FFF, 0xB504F333F9DE6484),
make_floatx80_init(0x3FFF, 0xB6FD91E328D17790),
make_floatx80_init(0x3FFF, 0xB8FBAF4762FB9EE8),
make_floatx80_init(0x3FFF, 0xBAFF5AB2133E45FC),
make_floatx80_init(0x3FFF, 0xBD08A39F580C36C0),
make_floatx80_init(0x3FFF, 0xBF1799B67A731084),
make_floatx80_init(0x3FFF, 0xC12C4CCA66709458),
make_floatx80_init(0x3FFF, 0xC346CCDA24976408),
make_floatx80_init(0x3FFF, 0xC5672A115506DADC),
make_floatx80_init(0x3FFF, 0xC78D74C8ABB9B15C),
make_floatx80_init(0x3FFF, 0xC9B9BD866E2F27A4),
make_floatx80_init(0x3FFF, 0xCBEC14FEF2727C5C),
make_floatx80_init(0x3FFF, 0xCE248C151F8480E4),
make_floatx80_init(0x3FFF, 0xD06333DAEF2B2594),
make_floatx80_init(0x3FFF, 0xD2A81D91F12AE45C),
make_floatx80_init(0x3FFF, 0xD4F35AABCFEDFA20),
make_floatx80_init(0x3FFF, 0xD744FCCAD69D6AF4),
make_floatx80_init(0x3FFF, 0xD99D15C278AFD7B4),
make_floatx80_init(0x3FFF, 0xDBFBB797DAF23754),
make_floatx80_init(0x3FFF, 0xDE60F4825E0E9124),
make_floatx80_init(0x3FFF, 0xE0CCDEEC2A94E110),
make_floatx80_init(0x3FFF, 0xE33F8972BE8A5A50),
make_floatx80_init(0x3FFF, 0xE5B906E77C8348A8),
make_floatx80_init(0x3FFF, 0xE8396A503C4BDC68),
make_floatx80_init(0x3FFF, 0xEAC0C6E7DD243930),
make_floatx80_init(0x3FFF, 0xED4F301ED9942B84),
make_floatx80_init(0x3FFF, 0xEFE4B99BDCDAF5CC),
make_floatx80_init(0x3FFF, 0xF281773C59FFB138),
make_floatx80_init(0x3FFF, 0xF5257D152486CC2C),
make_floatx80_init(0x3FFF, 0xF7D0DF730AD13BB8),
make_floatx80_init(0x3FFF, 0xFA83B2DB722A033C),
make_floatx80_init(0x3FFF, 0xFD3E0C0CF486C174)
};
static const float32 exp_tbl2[64] = {
const_float32(0x00000000),
const_float32(0x9F841A9B),
const_float32(0x9FC1D5B9),
const_float32(0xA0728369),
const_float32(0x1FC5C95C),
const_float32(0x1EE85C9F),
const_float32(0x9FA20729),
const_float32(0xA07BF9AF),
const_float32(0xA0020DCF),
const_float32(0x205A63DA),
const_float32(0x1EB70051),
const_float32(0x1F6EB029),
const_float32(0xA0781494),
const_float32(0x9EB319B0),
const_float32(0x2017457D),
const_float32(0x1F11D537),
const_float32(0x9FB952DD),
const_float32(0x1FE43087),
const_float32(0x1FA2A818),
const_float32(0x1FDE494D),
const_float32(0x20504890),
const_float32(0xA073691C),
const_float32(0x1F9B7A05),
const_float32(0xA0797126),
const_float32(0xA071A140),
const_float32(0x204F62DA),
const_float32(0x1F283C4A),
const_float32(0x9F9A7FDC),
const_float32(0xA05B3FAC),
const_float32(0x1FDF2610),
const_float32(0x9F705F90),
const_float32(0x201F678A),
const_float32(0x1F32FB13),
const_float32(0x20038B30),
const_float32(0x200DC3CC),
const_float32(0x9F8B2AE6),
const_float32(0xA02BBF70),
const_float32(0xA00BF518),
const_float32(0xA041DD41),
const_float32(0x9FDF137B),
const_float32(0x201F1568),
const_float32(0x1FC13A2E),
const_float32(0xA03F8F03),
const_float32(0x1FF4907D),
const_float32(0x9E6E53E4),
const_float32(0x1FD6D45C),
const_float32(0xA076EDB9),
const_float32(0x9FA6DE21),
const_float32(0x1EE69A2F),
const_float32(0x207F439F),
const_float32(0x201EC207),
const_float32(0x9E8BE175),
const_float32(0x20032C4B),
const_float32(0x2004DFF5),
const_float32(0x1E72F47A),
const_float32(0x1F722F22),
const_float32(0xA017E945),
const_float32(0x1F401A5B),
const_float32(0x9FB9A9E3),
const_float32(0x20744C05),
const_float32(0x1F773A19),
const_float32(0x1FFE90D5),
const_float32(0xA041ED22),
const_float32(0x1F853F3A),
};
#endif

3
target/m68k/translate.c
View File

@ -5057,6 +5057,9 @@ DISAS_INSN(fpu)
case 0x06: /* flognp1 */
gen_helper_flognp1(cpu_env, cpu_dest, cpu_src);
break;
case 0x10: /* fetox */
gen_helper_fetox(cpu_env, cpu_dest, cpu_src);
break;
case 0x14: /* flogn */
gen_helper_flogn(cpu_env, cpu_dest, cpu_src);
break;