From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:38194) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1euJSl-0003M8-La for qemu-devel@nongnu.org; Fri, 09 Mar 2018 09:57:41 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1euJSk-000311-BJ for qemu-devel@nongnu.org; Fri, 09 Mar 2018 09:57:39 -0500 Received: from mout.kundenserver.de ([217.72.192.74]:48443) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1euJSk-00030K-2U for qemu-devel@nongnu.org; Fri, 09 Mar 2018 09:57:38 -0500 From: Laurent Vivier Date: Fri, 9 Mar 2018 15:57:17 +0100 Message-Id: <20180309145717.9603-9-laurent@vivier.eu> In-Reply-To: <20180309145717.9603-1-laurent@vivier.eu> References: <20180309145717.9603-1-laurent@vivier.eu> Subject: [Qemu-devel] [PULL v2 8/8] target/m68k: implement ftentox List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Laurent Vivier Using a local m68k floatx80_tentox() [copied from previous: Written by Andreas Grabher for Previous, NeXT Computer Emulator.] Signed-off-by: Laurent Vivier Message-Id: <20180305203910.10391-9-laurent@vivier.eu> --- target/m68k/fpu_helper.c | 5 ++ target/m68k/helper.h | 1 + target/m68k/softfloat.c | 153 +++++++++++++++++++++++++++++++++++++++++++++++ target/m68k/softfloat.h | 1 + target/m68k/translate.c | 3 + 5 files changed, 163 insertions(+) diff --git a/target/m68k/fpu_helper.c b/target/m68k/fpu_helper.c index f488a92ab2..62cbb0dff1 100644 --- a/target/m68k/fpu_helper.c +++ b/target/m68k/fpu_helper.c @@ -587,3 +587,8 @@ void HELPER(ftwotox)(CPUM68KState *env, FPReg *res, FPReg *val) { res->d = floatx80_twotox(val->d, &env->fp_status); } + +void HELPER(ftentox)(CPUM68KState *env, FPReg *res, FPReg *val) +{ + res->d = floatx80_tentox(val->d, &env->fp_status); +} diff --git a/target/m68k/helper.h b/target/m68k/helper.h index 8caa82296d..9a9734c196 100644 --- a/target/m68k/helper.h +++ b/target/m68k/helper.h @@ -74,6 +74,7 @@ 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(ftentox, 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 cfff30d359..4bd5b9e6b7 100644 --- a/target/m68k/softfloat.c +++ b/target/m68k/softfloat.c @@ -1113,3 +1113,156 @@ floatx80 floatx80_twotox(floatx80 a, float_status *status) return a; } } + +/*---------------------------------------------------------------------------- + | 10 to x + *----------------------------------------------------------------------------*/ + +floatx80 floatx80_tentox(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 > 0x400B9B07) { + /* |X| > 16480 LOG2/LOG10 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 LOG 2 / LOG 10 */ + fp1 = fp0; /* X */ + fp1 = floatx80_mul(fp1, float64_to_floatx80( + make_float64(0x406A934F0979A371), + status), status); /* X*64*LOG10/LOG2 */ + n = floatx80_to_int32(fp1, status); /* N=INT(X*64*LOG10/LOG2) */ + 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; + + fp2 = fp1; /* N */ + fp1 = floatx80_mul(fp1, float64_to_floatx80( + make_float64(0x3F734413509F8000), status), + status); /* N*(LOG2/64LOG10)_LEAD */ + fp3 = packFloatx80(1, 0x3FCD, LIT64(0xC0219DC1DA994FD2)); + fp2 = floatx80_mul(fp2, fp3, status); /* N*(LOG2/64LOG10)_TRAIL */ + fp0 = floatx80_sub(fp0, fp1, status); /* X - N L_LEAD */ + fp0 = floatx80_sub(fp0, fp2, status); /* X - N L_TRAIL */ + fp2 = packFloatx80(0, 0x4000, LIT64(0x935D8DDDAAA8AC17)); /* LOG10 */ + 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 964275d2a5..d28e49fe9f 100644 --- a/target/m68k/softfloat.h +++ b/target/m68k/softfloat.h @@ -33,4 +33,5 @@ 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); +floatx80 floatx80_tentox(floatx80 a, float_status *status); #endif diff --git a/target/m68k/translate.c b/target/m68k/translate.c index c65c82e258..6d5bde0777 100644 --- a/target/m68k/translate.c +++ b/target/m68k/translate.c @@ -5063,6 +5063,9 @@ DISAS_INSN(fpu) case 0x11: /* ftwotox */ gen_helper_ftwotox(cpu_env, cpu_dest, cpu_src); break; + case 0x12: /* ftentox */ + gen_helper_ftentox(cpu_env, cpu_dest, cpu_src); + break; case 0x14: /* flogn */ gen_helper_flogn(cpu_env, cpu_dest, cpu_src); break; -- 2.14.3