From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58936) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1euIyq-0000wA-TT for qemu-devel@nongnu.org; Fri, 09 Mar 2018 09:26:46 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1euIym-0007C0-Tq for qemu-devel@nongnu.org; Fri, 09 Mar 2018 09:26:44 -0500 Received: from mout.kundenserver.de ([212.227.17.13]:34705) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1euIym-0007BG-A8 for qemu-devel@nongnu.org; Fri, 09 Mar 2018 09:26:40 -0500 From: Laurent Vivier Date: Fri, 9 Mar 2018 15:26:25 +0100 Message-Id: <20180309142630.2170-4-laurent@vivier.eu> In-Reply-To: <20180309142630.2170-1-laurent@vivier.eu> References: <20180309142630.2170-1-laurent@vivier.eu> Subject: [Qemu-devel] [PULL 3/8] target/m68k: implement flogn 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_logn() [copied from previous: Written by Andreas Grabher for Previous, NeXT Computer Emulator.] Signed-off-by: Laurent Vivier Message-Id: <20180305203910.10391-4-laurent@vivier.eu> --- target/m68k/fpu_helper.c | 5 ++ target/m68k/helper.h | 1 + target/m68k/softfloat.c | 168 +++++++++++++++++++++++++++++++++++++++++++++++ target/m68k/softfloat.h | 1 + target/m68k/translate.c | 3 + 5 files changed, 178 insertions(+) diff --git a/target/m68k/fpu_helper.c b/target/m68k/fpu_helper.c index 614064612e..cc6d3dfa52 100644 --- a/target/m68k/fpu_helper.c +++ b/target/m68k/fpu_helper.c @@ -562,3 +562,8 @@ void HELPER(flognp1)(CPUM68KState *env, FPReg *res, FPReg *val) { res->d = floatx80_lognp1(val->d, &env->fp_status); } + +void HELPER(flogn)(CPUM68KState *env, FPReg *res, FPReg *val) +{ + res->d = floatx80_logn(val->d, &env->fp_status); +} diff --git a/target/m68k/helper.h b/target/m68k/helper.h index f7e6fc8c40..68e5f4c0a7 100644 --- a/target/m68k/helper.h +++ b/target/m68k/helper.h @@ -69,6 +69,7 @@ DEF_HELPER_3(fgetexp, void, env, fp, fp) DEF_HELPER_3(fgetman, void, env, fp, fp) DEF_HELPER_4(fscale, void, env, fp, fp, fp) DEF_HELPER_3(flognp1, void, env, fp, fp) +DEF_HELPER_3(flogn, 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 834db12964..180a17c39b 100644 --- a/target/m68k/softfloat.c +++ b/target/m68k/softfloat.c @@ -490,3 +490,171 @@ floatx80 floatx80_lognp1(floatx80 a, float_status *status) return a; } } + +/*---------------------------------------------------------------------------- + | Log base e + *----------------------------------------------------------------------------*/ + +floatx80 floatx80_logn(floatx80 a, float_status *status) +{ + flag aSign; + int32_t aExp; + uint64_t aSig, fSig; + + int8_t user_rnd_mode, user_rnd_prec; + + int32_t compact, j, k, adjk; + floatx80 fp0, fp1, fp2, fp3, f, logof2, klog2, saveu; + + aSig = extractFloatx80Frac(a); + aExp = extractFloatx80Exp(a); + aSign = extractFloatx80Sign(a); + + if (aExp == 0x7FFF) { + if ((uint64_t) (aSig << 1)) { + propagateFloatx80NaNOneArg(a, status); + } + if (aSign == 0) { + return packFloatx80(0, floatx80_infinity.high, + floatx80_infinity.low); + } + } + + adjk = 0; + + if (aExp == 0) { + if (aSig == 0) { /* zero */ + float_raise(float_flag_divbyzero, status); + return packFloatx80(1, floatx80_infinity.high, + floatx80_infinity.low); + } + if ((aSig & one_sig) == 0) { /* denormal */ + normalizeFloatx80Subnormal(aSig, &aExp, &aSig); + adjk = -100; + aExp += 100; + a = packFloatx80(aSign, aExp, aSig); + } + } + + if (aSign) { + float_raise(float_flag_invalid, status); + return floatx80_default_nan(status); + } + + 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; + + compact = floatx80_make_compact(aExp, aSig); + + if (compact < 0x3FFEF07D || compact > 0x3FFF8841) { + /* |X| < 15/16 or |X| > 17/16 */ + k = aExp - 0x3FFF; + k += adjk; + fp1 = int32_to_floatx80(k, status); + + fSig = (aSig & LIT64(0xFE00000000000000)) | LIT64(0x0100000000000000); + j = (fSig >> 56) & 0x7E; /* DISPLACEMENT FOR 1/F */ + + f = packFloatx80(0, 0x3FFF, fSig); /* F */ + fp0 = packFloatx80(0, 0x3FFF, aSig); /* Y */ + + fp0 = floatx80_sub(fp0, f, status); /* Y-F */ + + /* LP1CONT1 */ + fp0 = floatx80_mul(fp0, log_tbl[j], status); /* FP0 IS U = (Y-F)/F */ + logof2 = packFloatx80(0, 0x3FFE, LIT64(0xB17217F7D1CF79AC)); + klog2 = floatx80_mul(fp1, logof2, status); /* FP1 IS K*LOG2 */ + fp2 = floatx80_mul(fp0, fp0, status); /* FP2 IS V=U*U */ + + fp3 = fp2; + fp1 = fp2; + + fp1 = floatx80_mul(fp1, float64_to_floatx80( + make_float64(0x3FC2499AB5E4040B), status), + status); /* V*A6 */ + fp2 = floatx80_mul(fp2, float64_to_floatx80( + make_float64(0xBFC555B5848CB7DB), status), + status); /* V*A5 */ + fp1 = floatx80_add(fp1, float64_to_floatx80( + make_float64(0x3FC99999987D8730), status), + status); /* A4+V*A6 */ + fp2 = floatx80_add(fp2, float64_to_floatx80( + make_float64(0xBFCFFFFFFF6F7E97), status), + status); /* A3+V*A5 */ + fp1 = floatx80_mul(fp1, fp3, status); /* V*(A4+V*A6) */ + fp2 = floatx80_mul(fp2, fp3, status); /* V*(A3+V*A5) */ + fp1 = floatx80_add(fp1, float64_to_floatx80( + make_float64(0x3FD55555555555A4), status), + status); /* A2+V*(A4+V*A6) */ + fp2 = floatx80_add(fp2, float64_to_floatx80( + make_float64(0xBFE0000000000008), status), + status); /* A1+V*(A3+V*A5) */ + fp1 = floatx80_mul(fp1, fp3, status); /* V*(A2+V*(A4+V*A6)) */ + fp2 = floatx80_mul(fp2, fp3, status); /* V*(A1+V*(A3+V*A5)) */ + fp1 = floatx80_mul(fp1, fp0, status); /* U*V*(A2+V*(A4+V*A6)) */ + fp0 = floatx80_add(fp0, fp2, status); /* U+V*(A1+V*(A3+V*A5)) */ + + fp1 = floatx80_add(fp1, log_tbl[j + 1], + status); /* LOG(F)+U*V*(A2+V*(A4+V*A6)) */ + fp0 = floatx80_add(fp0, fp1, status); /* FP0 IS LOG(F) + LOG(1+U) */ + + status->float_rounding_mode = user_rnd_mode; + status->floatx80_rounding_precision = user_rnd_prec; + + a = floatx80_add(fp0, klog2, status); + + float_raise(float_flag_inexact, status); + + return a; + } else { /* |X-1| >= 1/16 */ + fp0 = a; + fp1 = a; + fp1 = floatx80_sub(fp1, float32_to_floatx80(make_float32(0x3F800000), + status), status); /* FP1 IS X-1 */ + fp0 = floatx80_add(fp0, float32_to_floatx80(make_float32(0x3F800000), + status), status); /* FP0 IS X+1 */ + fp1 = floatx80_add(fp1, fp1, status); /* FP1 IS 2(X-1) */ + + /* LP1CONT2 */ + fp1 = floatx80_div(fp1, fp0, status); /* U */ + saveu = fp1; + fp0 = floatx80_mul(fp1, fp1, status); /* FP0 IS V = U*U */ + fp1 = floatx80_mul(fp0, fp0, status); /* FP1 IS W = V*V */ + + fp3 = float64_to_floatx80(make_float64(0x3F175496ADD7DAD6), + status); /* B5 */ + fp2 = float64_to_floatx80(make_float64(0x3F3C71C2FE80C7E0), + status); /* B4 */ + fp3 = floatx80_mul(fp3, fp1, status); /* W*B5 */ + fp2 = floatx80_mul(fp2, fp1, status); /* W*B4 */ + fp3 = floatx80_add(fp3, float64_to_floatx80( + make_float64(0x3F624924928BCCFF), status), + status); /* B3+W*B5 */ + fp2 = floatx80_add(fp2, float64_to_floatx80( + make_float64(0x3F899999999995EC), status), + status); /* B2+W*B4 */ + fp1 = floatx80_mul(fp1, fp3, status); /* W*(B3+W*B5) */ + fp2 = floatx80_mul(fp2, fp0, status); /* V*(B2+W*B4) */ + fp1 = floatx80_add(fp1, float64_to_floatx80( + make_float64(0x3FB5555555555555), status), + status); /* B1+W*(B3+W*B5) */ + + fp0 = floatx80_mul(fp0, saveu, status); /* FP0 IS U*V */ + fp1 = floatx80_add(fp1, fp2, status); /* B1+W*(B3+W*B5) + V*(B2+W*B4) */ + fp0 = floatx80_mul(fp0, fp1, + status); /* U*V*([B1+W*(B3+W*B5)] + [V*(B2+W*B4)]) */ + + status->float_rounding_mode = user_rnd_mode; + status->floatx80_rounding_precision = user_rnd_prec; + + a = floatx80_add(fp0, saveu, status); + + /*if (!floatx80_is_zero(a)) { */ + float_raise(float_flag_inexact, status); + /*} */ + + return a; + } +} diff --git a/target/m68k/softfloat.h b/target/m68k/softfloat.h index 4d74eaf862..161bd6dff7 100644 --- a/target/m68k/softfloat.h +++ b/target/m68k/softfloat.h @@ -28,4 +28,5 @@ floatx80 floatx80_getexp(floatx80 a, float_status *status); floatx80 floatx80_scale(floatx80 a, floatx80 b, float_status *status); floatx80 floatx80_move(floatx80 a, float_status *status); floatx80 floatx80_lognp1(floatx80 a, float_status *status); +floatx80 floatx80_logn(floatx80 a, float_status *status); #endif diff --git a/target/m68k/translate.c b/target/m68k/translate.c index 2c3d20154a..705b9b0d5b 100644 --- a/target/m68k/translate.c +++ b/target/m68k/translate.c @@ -5057,6 +5057,9 @@ DISAS_INSN(fpu) case 0x06: /* flognp1 */ gen_helper_flognp1(cpu_env, cpu_dest, cpu_src); break; + case 0x14: /* flogn */ + gen_helper_flogn(cpu_env, cpu_dest, cpu_src); + break; case 0x18: /* fabs */ gen_helper_fabs(cpu_env, cpu_dest, cpu_src); break; -- 2.14.3