1591596b7SLaurent Vivier /* 2591596b7SLaurent Vivier * Ported from a work by Andreas Grabher for Previous, NeXT Computer Emulator, 3591596b7SLaurent Vivier * derived from NetBSD M68040 FPSP functions, 4591596b7SLaurent Vivier * derived from release 2a of the SoftFloat IEC/IEEE Floating-point Arithmetic 5591596b7SLaurent Vivier * Package. Those parts of the code (and some later contributions) are 6591596b7SLaurent Vivier * provided under that license, as detailed below. 7591596b7SLaurent Vivier * It has subsequently been modified by contributors to the QEMU Project, 8591596b7SLaurent Vivier * so some portions are provided under: 9591596b7SLaurent Vivier * the SoftFloat-2a license 10591596b7SLaurent Vivier * the BSD license 11591596b7SLaurent Vivier * GPL-v2-or-later 12591596b7SLaurent Vivier * 13591596b7SLaurent Vivier * Any future contributions to this file will be taken to be licensed under 14591596b7SLaurent Vivier * the Softfloat-2a license unless specifically indicated otherwise. 15591596b7SLaurent Vivier */ 16591596b7SLaurent Vivier 17591596b7SLaurent Vivier /* Portions of this work are licensed under the terms of the GNU GPL, 18591596b7SLaurent Vivier * version 2 or later. See the COPYING file in the top-level directory. 19591596b7SLaurent Vivier */ 20591596b7SLaurent Vivier 21591596b7SLaurent Vivier #include "qemu/osdep.h" 22591596b7SLaurent Vivier #include "softfloat.h" 23591596b7SLaurent Vivier #include "fpu/softfloat-macros.h" 244b5c65b8SLaurent Vivier #include "softfloat_fpsp_tables.h" 25591596b7SLaurent Vivier 260d379c17SLaurent Vivier static floatx80 propagateFloatx80NaNOneArg(floatx80 a, float_status *status) 270d379c17SLaurent Vivier { 280d379c17SLaurent Vivier if (floatx80_is_signaling_nan(a, status)) { 290d379c17SLaurent Vivier float_raise(float_flag_invalid, status); 300d379c17SLaurent Vivier } 310d379c17SLaurent Vivier 320d379c17SLaurent Vivier if (status->default_nan_mode) { 330d379c17SLaurent Vivier return floatx80_default_nan(status); 340d379c17SLaurent Vivier } 350d379c17SLaurent Vivier 360d379c17SLaurent Vivier return floatx80_maybe_silence_nan(a, status); 370d379c17SLaurent Vivier } 380d379c17SLaurent Vivier 39591596b7SLaurent Vivier /*---------------------------------------------------------------------------- 40591596b7SLaurent Vivier | Returns the modulo remainder of the extended double-precision floating-point 41591596b7SLaurent Vivier | value `a' with respect to the corresponding value `b'. 42591596b7SLaurent Vivier *----------------------------------------------------------------------------*/ 43591596b7SLaurent Vivier 44591596b7SLaurent Vivier floatx80 floatx80_mod(floatx80 a, floatx80 b, float_status *status) 45591596b7SLaurent Vivier { 46591596b7SLaurent Vivier flag aSign, zSign; 47591596b7SLaurent Vivier int32_t aExp, bExp, expDiff; 48591596b7SLaurent Vivier uint64_t aSig0, aSig1, bSig; 49591596b7SLaurent Vivier uint64_t qTemp, term0, term1; 50591596b7SLaurent Vivier 51591596b7SLaurent Vivier aSig0 = extractFloatx80Frac(a); 52591596b7SLaurent Vivier aExp = extractFloatx80Exp(a); 53591596b7SLaurent Vivier aSign = extractFloatx80Sign(a); 54591596b7SLaurent Vivier bSig = extractFloatx80Frac(b); 55591596b7SLaurent Vivier bExp = extractFloatx80Exp(b); 56591596b7SLaurent Vivier 57591596b7SLaurent Vivier if (aExp == 0x7FFF) { 58591596b7SLaurent Vivier if ((uint64_t) (aSig0 << 1) 59591596b7SLaurent Vivier || ((bExp == 0x7FFF) && (uint64_t) (bSig << 1))) { 60591596b7SLaurent Vivier return propagateFloatx80NaN(a, b, status); 61591596b7SLaurent Vivier } 62591596b7SLaurent Vivier goto invalid; 63591596b7SLaurent Vivier } 64591596b7SLaurent Vivier if (bExp == 0x7FFF) { 65591596b7SLaurent Vivier if ((uint64_t) (bSig << 1)) { 66591596b7SLaurent Vivier return propagateFloatx80NaN(a, b, status); 67591596b7SLaurent Vivier } 68591596b7SLaurent Vivier return a; 69591596b7SLaurent Vivier } 70591596b7SLaurent Vivier if (bExp == 0) { 71591596b7SLaurent Vivier if (bSig == 0) { 72591596b7SLaurent Vivier invalid: 73591596b7SLaurent Vivier float_raise(float_flag_invalid, status); 74591596b7SLaurent Vivier return floatx80_default_nan(status); 75591596b7SLaurent Vivier } 76591596b7SLaurent Vivier normalizeFloatx80Subnormal(bSig, &bExp, &bSig); 77591596b7SLaurent Vivier } 78591596b7SLaurent Vivier if (aExp == 0) { 79591596b7SLaurent Vivier if ((uint64_t) (aSig0 << 1) == 0) { 80591596b7SLaurent Vivier return a; 81591596b7SLaurent Vivier } 82591596b7SLaurent Vivier normalizeFloatx80Subnormal(aSig0, &aExp, &aSig0); 83591596b7SLaurent Vivier } 84591596b7SLaurent Vivier bSig |= LIT64(0x8000000000000000); 85591596b7SLaurent Vivier zSign = aSign; 86591596b7SLaurent Vivier expDiff = aExp - bExp; 87591596b7SLaurent Vivier aSig1 = 0; 88591596b7SLaurent Vivier if (expDiff < 0) { 89591596b7SLaurent Vivier return a; 90591596b7SLaurent Vivier } 91591596b7SLaurent Vivier qTemp = (bSig <= aSig0); 92591596b7SLaurent Vivier if (qTemp) { 93591596b7SLaurent Vivier aSig0 -= bSig; 94591596b7SLaurent Vivier } 95591596b7SLaurent Vivier expDiff -= 64; 96591596b7SLaurent Vivier while (0 < expDiff) { 97591596b7SLaurent Vivier qTemp = estimateDiv128To64(aSig0, aSig1, bSig); 98591596b7SLaurent Vivier qTemp = (2 < qTemp) ? qTemp - 2 : 0; 99591596b7SLaurent Vivier mul64To128(bSig, qTemp, &term0, &term1); 100591596b7SLaurent Vivier sub128(aSig0, aSig1, term0, term1, &aSig0, &aSig1); 101591596b7SLaurent Vivier shortShift128Left(aSig0, aSig1, 62, &aSig0, &aSig1); 102591596b7SLaurent Vivier } 103591596b7SLaurent Vivier expDiff += 64; 104591596b7SLaurent Vivier if (0 < expDiff) { 105591596b7SLaurent Vivier qTemp = estimateDiv128To64(aSig0, aSig1, bSig); 106591596b7SLaurent Vivier qTemp = (2 < qTemp) ? qTemp - 2 : 0; 107591596b7SLaurent Vivier qTemp >>= 64 - expDiff; 108591596b7SLaurent Vivier mul64To128(bSig, qTemp << (64 - expDiff), &term0, &term1); 109591596b7SLaurent Vivier sub128(aSig0, aSig1, term0, term1, &aSig0, &aSig1); 110591596b7SLaurent Vivier shortShift128Left(0, bSig, 64 - expDiff, &term0, &term1); 111591596b7SLaurent Vivier while (le128(term0, term1, aSig0, aSig1)) { 112591596b7SLaurent Vivier ++qTemp; 113591596b7SLaurent Vivier sub128(aSig0, aSig1, term0, term1, &aSig0, &aSig1); 114591596b7SLaurent Vivier } 115591596b7SLaurent Vivier } 116591596b7SLaurent Vivier return 117591596b7SLaurent Vivier normalizeRoundAndPackFloatx80( 118591596b7SLaurent Vivier 80, zSign, bExp + expDiff, aSig0, aSig1, status); 119591596b7SLaurent Vivier } 1200d379c17SLaurent Vivier 1210d379c17SLaurent Vivier /*---------------------------------------------------------------------------- 1220d379c17SLaurent Vivier | Returns the mantissa of the extended double-precision floating-point 1230d379c17SLaurent Vivier | value `a'. 1240d379c17SLaurent Vivier *----------------------------------------------------------------------------*/ 1250d379c17SLaurent Vivier 1260d379c17SLaurent Vivier floatx80 floatx80_getman(floatx80 a, float_status *status) 1270d379c17SLaurent Vivier { 1280d379c17SLaurent Vivier flag aSign; 1290d379c17SLaurent Vivier int32_t aExp; 1300d379c17SLaurent Vivier uint64_t aSig; 1310d379c17SLaurent Vivier 1320d379c17SLaurent Vivier aSig = extractFloatx80Frac(a); 1330d379c17SLaurent Vivier aExp = extractFloatx80Exp(a); 1340d379c17SLaurent Vivier aSign = extractFloatx80Sign(a); 1350d379c17SLaurent Vivier 1360d379c17SLaurent Vivier if (aExp == 0x7FFF) { 1370d379c17SLaurent Vivier if ((uint64_t) (aSig << 1)) { 1380d379c17SLaurent Vivier return propagateFloatx80NaNOneArg(a , status); 1390d379c17SLaurent Vivier } 1400d379c17SLaurent Vivier float_raise(float_flag_invalid , status); 1410d379c17SLaurent Vivier return floatx80_default_nan(status); 1420d379c17SLaurent Vivier } 1430d379c17SLaurent Vivier 1440d379c17SLaurent Vivier if (aExp == 0) { 1450d379c17SLaurent Vivier if (aSig == 0) { 1460d379c17SLaurent Vivier return packFloatx80(aSign, 0, 0); 1470d379c17SLaurent Vivier } 1480d379c17SLaurent Vivier normalizeFloatx80Subnormal(aSig, &aExp, &aSig); 1490d379c17SLaurent Vivier } 1500d379c17SLaurent Vivier 1510d379c17SLaurent Vivier return roundAndPackFloatx80(status->floatx80_rounding_precision, aSign, 1520d379c17SLaurent Vivier 0x3FFF, aSig, 0, status); 1530d379c17SLaurent Vivier } 1540d379c17SLaurent Vivier 1550d379c17SLaurent Vivier /*---------------------------------------------------------------------------- 1560d379c17SLaurent Vivier | Returns the exponent of the extended double-precision floating-point 1570d379c17SLaurent Vivier | value `a' as an extended double-precision value. 1580d379c17SLaurent Vivier *----------------------------------------------------------------------------*/ 1590d379c17SLaurent Vivier 1600d379c17SLaurent Vivier floatx80 floatx80_getexp(floatx80 a, float_status *status) 1610d379c17SLaurent Vivier { 1620d379c17SLaurent Vivier flag aSign; 1630d379c17SLaurent Vivier int32_t aExp; 1640d379c17SLaurent Vivier uint64_t aSig; 1650d379c17SLaurent Vivier 1660d379c17SLaurent Vivier aSig = extractFloatx80Frac(a); 1670d379c17SLaurent Vivier aExp = extractFloatx80Exp(a); 1680d379c17SLaurent Vivier aSign = extractFloatx80Sign(a); 1690d379c17SLaurent Vivier 1700d379c17SLaurent Vivier if (aExp == 0x7FFF) { 1710d379c17SLaurent Vivier if ((uint64_t) (aSig << 1)) { 1720d379c17SLaurent Vivier return propagateFloatx80NaNOneArg(a , status); 1730d379c17SLaurent Vivier } 1740d379c17SLaurent Vivier float_raise(float_flag_invalid , status); 1750d379c17SLaurent Vivier return floatx80_default_nan(status); 1760d379c17SLaurent Vivier } 1770d379c17SLaurent Vivier 1780d379c17SLaurent Vivier if (aExp == 0) { 1790d379c17SLaurent Vivier if (aSig == 0) { 1800d379c17SLaurent Vivier return packFloatx80(aSign, 0, 0); 1810d379c17SLaurent Vivier } 1820d379c17SLaurent Vivier normalizeFloatx80Subnormal(aSig, &aExp, &aSig); 1830d379c17SLaurent Vivier } 1840d379c17SLaurent Vivier 1850d379c17SLaurent Vivier return int32_to_floatx80(aExp - 0x3FFF, status); 1860d379c17SLaurent Vivier } 1870d379c17SLaurent Vivier 1880d379c17SLaurent Vivier /*---------------------------------------------------------------------------- 1890d379c17SLaurent Vivier | Scales extended double-precision floating-point value in operand `a' by 1900d379c17SLaurent Vivier | value `b'. The function truncates the value in the second operand 'b' to 1910d379c17SLaurent Vivier | an integral value and adds that value to the exponent of the operand 'a'. 1920d379c17SLaurent Vivier | The operation performed according to the IEC/IEEE Standard for Binary 1930d379c17SLaurent Vivier | Floating-Point Arithmetic. 1940d379c17SLaurent Vivier *----------------------------------------------------------------------------*/ 1950d379c17SLaurent Vivier 1960d379c17SLaurent Vivier floatx80 floatx80_scale(floatx80 a, floatx80 b, float_status *status) 1970d379c17SLaurent Vivier { 1980d379c17SLaurent Vivier flag aSign, bSign; 1990d379c17SLaurent Vivier int32_t aExp, bExp, shiftCount; 2000d379c17SLaurent Vivier uint64_t aSig, bSig; 2010d379c17SLaurent Vivier 2020d379c17SLaurent Vivier aSig = extractFloatx80Frac(a); 2030d379c17SLaurent Vivier aExp = extractFloatx80Exp(a); 2040d379c17SLaurent Vivier aSign = extractFloatx80Sign(a); 2050d379c17SLaurent Vivier bSig = extractFloatx80Frac(b); 2060d379c17SLaurent Vivier bExp = extractFloatx80Exp(b); 2070d379c17SLaurent Vivier bSign = extractFloatx80Sign(b); 2080d379c17SLaurent Vivier 2090d379c17SLaurent Vivier if (bExp == 0x7FFF) { 2100d379c17SLaurent Vivier if ((uint64_t) (bSig << 1) || 2110d379c17SLaurent Vivier ((aExp == 0x7FFF) && (uint64_t) (aSig << 1))) { 2120d379c17SLaurent Vivier return propagateFloatx80NaN(a, b, status); 2130d379c17SLaurent Vivier } 2140d379c17SLaurent Vivier float_raise(float_flag_invalid , status); 2150d379c17SLaurent Vivier return floatx80_default_nan(status); 2160d379c17SLaurent Vivier } 2170d379c17SLaurent Vivier if (aExp == 0x7FFF) { 2180d379c17SLaurent Vivier if ((uint64_t) (aSig << 1)) { 2190d379c17SLaurent Vivier return propagateFloatx80NaN(a, b, status); 2200d379c17SLaurent Vivier } 2210d379c17SLaurent Vivier return packFloatx80(aSign, floatx80_infinity.high, 2220d379c17SLaurent Vivier floatx80_infinity.low); 2230d379c17SLaurent Vivier } 2240d379c17SLaurent Vivier if (aExp == 0) { 2250d379c17SLaurent Vivier if (aSig == 0) { 2260d379c17SLaurent Vivier return packFloatx80(aSign, 0, 0); 2270d379c17SLaurent Vivier } 2280d379c17SLaurent Vivier if (bExp < 0x3FFF) { 2290d379c17SLaurent Vivier return a; 2300d379c17SLaurent Vivier } 2310d379c17SLaurent Vivier normalizeFloatx80Subnormal(aSig, &aExp, &aSig); 2320d379c17SLaurent Vivier } 2330d379c17SLaurent Vivier 2340d379c17SLaurent Vivier if (bExp < 0x3FFF) { 2350d379c17SLaurent Vivier return a; 2360d379c17SLaurent Vivier } 2370d379c17SLaurent Vivier 2380d379c17SLaurent Vivier if (0x400F < bExp) { 2390d379c17SLaurent Vivier aExp = bSign ? -0x6001 : 0xE000; 2400d379c17SLaurent Vivier return roundAndPackFloatx80(status->floatx80_rounding_precision, 2410d379c17SLaurent Vivier aSign, aExp, aSig, 0, status); 2420d379c17SLaurent Vivier } 2430d379c17SLaurent Vivier 2440d379c17SLaurent Vivier shiftCount = 0x403E - bExp; 2450d379c17SLaurent Vivier bSig >>= shiftCount; 2460d379c17SLaurent Vivier aExp = bSign ? (aExp - bSig) : (aExp + bSig); 2470d379c17SLaurent Vivier 2480d379c17SLaurent Vivier return roundAndPackFloatx80(status->floatx80_rounding_precision, 2490d379c17SLaurent Vivier aSign, aExp, aSig, 0, status); 2500d379c17SLaurent Vivier } 2519a069775SLaurent Vivier 2529a069775SLaurent Vivier floatx80 floatx80_move(floatx80 a, float_status *status) 2539a069775SLaurent Vivier { 2549a069775SLaurent Vivier flag aSign; 2559a069775SLaurent Vivier int32_t aExp; 2569a069775SLaurent Vivier uint64_t aSig; 2579a069775SLaurent Vivier 2589a069775SLaurent Vivier aSig = extractFloatx80Frac(a); 2599a069775SLaurent Vivier aExp = extractFloatx80Exp(a); 2609a069775SLaurent Vivier aSign = extractFloatx80Sign(a); 2619a069775SLaurent Vivier 2629a069775SLaurent Vivier if (aExp == 0x7FFF) { 2639a069775SLaurent Vivier if ((uint64_t)(aSig << 1)) { 2649a069775SLaurent Vivier return propagateFloatx80NaNOneArg(a, status); 2659a069775SLaurent Vivier } 2669a069775SLaurent Vivier return a; 2679a069775SLaurent Vivier } 2689a069775SLaurent Vivier if (aExp == 0) { 2699a069775SLaurent Vivier if (aSig == 0) { 2709a069775SLaurent Vivier return a; 2719a069775SLaurent Vivier } 2729a069775SLaurent Vivier normalizeRoundAndPackFloatx80(status->floatx80_rounding_precision, 2739a069775SLaurent Vivier aSign, aExp, aSig, 0, status); 2749a069775SLaurent Vivier } 2759a069775SLaurent Vivier return roundAndPackFloatx80(status->floatx80_rounding_precision, aSign, 2769a069775SLaurent Vivier aExp, aSig, 0, status); 2779a069775SLaurent Vivier } 2784b5c65b8SLaurent Vivier 2794b5c65b8SLaurent Vivier /*---------------------------------------------------------------------------- 2804b5c65b8SLaurent Vivier | Algorithms for transcendental functions supported by MC68881 and MC68882 2814b5c65b8SLaurent Vivier | mathematical coprocessors. The functions are derived from FPSP library. 2824b5c65b8SLaurent Vivier *----------------------------------------------------------------------------*/ 2834b5c65b8SLaurent Vivier 2844b5c65b8SLaurent Vivier #define one_exp 0x3FFF 2854b5c65b8SLaurent Vivier #define one_sig LIT64(0x8000000000000000) 2864b5c65b8SLaurent Vivier 2874b5c65b8SLaurent Vivier /*---------------------------------------------------------------------------- 2884b5c65b8SLaurent Vivier | Function for compactifying extended double-precision floating point values. 2894b5c65b8SLaurent Vivier *----------------------------------------------------------------------------*/ 2904b5c65b8SLaurent Vivier 2914b5c65b8SLaurent Vivier static int32_t floatx80_make_compact(int32_t aExp, uint64_t aSig) 2924b5c65b8SLaurent Vivier { 2934b5c65b8SLaurent Vivier return (aExp << 16) | (aSig >> 48); 2944b5c65b8SLaurent Vivier } 2954b5c65b8SLaurent Vivier 2964b5c65b8SLaurent Vivier /*---------------------------------------------------------------------------- 2974b5c65b8SLaurent Vivier | Log base e of x plus 1 2984b5c65b8SLaurent Vivier *----------------------------------------------------------------------------*/ 2994b5c65b8SLaurent Vivier 3004b5c65b8SLaurent Vivier floatx80 floatx80_lognp1(floatx80 a, float_status *status) 3014b5c65b8SLaurent Vivier { 3024b5c65b8SLaurent Vivier flag aSign; 3034b5c65b8SLaurent Vivier int32_t aExp; 3044b5c65b8SLaurent Vivier uint64_t aSig, fSig; 3054b5c65b8SLaurent Vivier 3064b5c65b8SLaurent Vivier int8_t user_rnd_mode, user_rnd_prec; 3074b5c65b8SLaurent Vivier 3084b5c65b8SLaurent Vivier int32_t compact, j, k; 3094b5c65b8SLaurent Vivier floatx80 fp0, fp1, fp2, fp3, f, logof2, klog2, saveu; 3104b5c65b8SLaurent Vivier 3114b5c65b8SLaurent Vivier aSig = extractFloatx80Frac(a); 3124b5c65b8SLaurent Vivier aExp = extractFloatx80Exp(a); 3134b5c65b8SLaurent Vivier aSign = extractFloatx80Sign(a); 3144b5c65b8SLaurent Vivier 3154b5c65b8SLaurent Vivier if (aExp == 0x7FFF) { 3164b5c65b8SLaurent Vivier if ((uint64_t) (aSig << 1)) { 3174b5c65b8SLaurent Vivier propagateFloatx80NaNOneArg(a, status); 3184b5c65b8SLaurent Vivier } 3194b5c65b8SLaurent Vivier if (aSign) { 3204b5c65b8SLaurent Vivier float_raise(float_flag_invalid, status); 3214b5c65b8SLaurent Vivier return floatx80_default_nan(status); 3224b5c65b8SLaurent Vivier } 3234b5c65b8SLaurent Vivier return packFloatx80(0, floatx80_infinity.high, floatx80_infinity.low); 3244b5c65b8SLaurent Vivier } 3254b5c65b8SLaurent Vivier 3264b5c65b8SLaurent Vivier if (aExp == 0 && aSig == 0) { 3274b5c65b8SLaurent Vivier return packFloatx80(aSign, 0, 0); 3284b5c65b8SLaurent Vivier } 3294b5c65b8SLaurent Vivier 3304b5c65b8SLaurent Vivier if (aSign && aExp >= one_exp) { 3314b5c65b8SLaurent Vivier if (aExp == one_exp && aSig == one_sig) { 3324b5c65b8SLaurent Vivier float_raise(float_flag_divbyzero, status); 3334b5c65b8SLaurent Vivier packFloatx80(aSign, floatx80_infinity.high, floatx80_infinity.low); 3344b5c65b8SLaurent Vivier } 3354b5c65b8SLaurent Vivier float_raise(float_flag_invalid, status); 3364b5c65b8SLaurent Vivier return floatx80_default_nan(status); 3374b5c65b8SLaurent Vivier } 3384b5c65b8SLaurent Vivier 3394b5c65b8SLaurent Vivier if (aExp < 0x3f99 || (aExp == 0x3f99 && aSig == one_sig)) { 3404b5c65b8SLaurent Vivier /* <= min threshold */ 3414b5c65b8SLaurent Vivier float_raise(float_flag_inexact, status); 3424b5c65b8SLaurent Vivier return floatx80_move(a, status); 3434b5c65b8SLaurent Vivier } 3444b5c65b8SLaurent Vivier 3454b5c65b8SLaurent Vivier user_rnd_mode = status->float_rounding_mode; 3464b5c65b8SLaurent Vivier user_rnd_prec = status->floatx80_rounding_precision; 3474b5c65b8SLaurent Vivier status->float_rounding_mode = float_round_nearest_even; 3484b5c65b8SLaurent Vivier status->floatx80_rounding_precision = 80; 3494b5c65b8SLaurent Vivier 3504b5c65b8SLaurent Vivier compact = floatx80_make_compact(aExp, aSig); 3514b5c65b8SLaurent Vivier 3524b5c65b8SLaurent Vivier fp0 = a; /* Z */ 3534b5c65b8SLaurent Vivier fp1 = a; 3544b5c65b8SLaurent Vivier 3554b5c65b8SLaurent Vivier fp0 = floatx80_add(fp0, float32_to_floatx80(make_float32(0x3F800000), 3564b5c65b8SLaurent Vivier status), status); /* X = (1+Z) */ 3574b5c65b8SLaurent Vivier 3584b5c65b8SLaurent Vivier aExp = extractFloatx80Exp(fp0); 3594b5c65b8SLaurent Vivier aSig = extractFloatx80Frac(fp0); 3604b5c65b8SLaurent Vivier 3614b5c65b8SLaurent Vivier compact = floatx80_make_compact(aExp, aSig); 3624b5c65b8SLaurent Vivier 3634b5c65b8SLaurent Vivier if (compact < 0x3FFE8000 || compact > 0x3FFFC000) { 3644b5c65b8SLaurent Vivier /* |X| < 1/2 or |X| > 3/2 */ 3654b5c65b8SLaurent Vivier k = aExp - 0x3FFF; 3664b5c65b8SLaurent Vivier fp1 = int32_to_floatx80(k, status); 3674b5c65b8SLaurent Vivier 3684b5c65b8SLaurent Vivier fSig = (aSig & LIT64(0xFE00000000000000)) | LIT64(0x0100000000000000); 3694b5c65b8SLaurent Vivier j = (fSig >> 56) & 0x7E; /* DISPLACEMENT FOR 1/F */ 3704b5c65b8SLaurent Vivier 3714b5c65b8SLaurent Vivier f = packFloatx80(0, 0x3FFF, fSig); /* F */ 3724b5c65b8SLaurent Vivier fp0 = packFloatx80(0, 0x3FFF, aSig); /* Y */ 3734b5c65b8SLaurent Vivier 3744b5c65b8SLaurent Vivier fp0 = floatx80_sub(fp0, f, status); /* Y-F */ 3754b5c65b8SLaurent Vivier 3764b5c65b8SLaurent Vivier lp1cont1: 3774b5c65b8SLaurent Vivier /* LP1CONT1 */ 3784b5c65b8SLaurent Vivier fp0 = floatx80_mul(fp0, log_tbl[j], status); /* FP0 IS U = (Y-F)/F */ 3794b5c65b8SLaurent Vivier logof2 = packFloatx80(0, 0x3FFE, LIT64(0xB17217F7D1CF79AC)); 3804b5c65b8SLaurent Vivier klog2 = floatx80_mul(fp1, logof2, status); /* FP1 IS K*LOG2 */ 3814b5c65b8SLaurent Vivier fp2 = floatx80_mul(fp0, fp0, status); /* FP2 IS V=U*U */ 3824b5c65b8SLaurent Vivier 3834b5c65b8SLaurent Vivier fp3 = fp2; 3844b5c65b8SLaurent Vivier fp1 = fp2; 3854b5c65b8SLaurent Vivier 3864b5c65b8SLaurent Vivier fp1 = floatx80_mul(fp1, float64_to_floatx80( 3874b5c65b8SLaurent Vivier make_float64(0x3FC2499AB5E4040B), status), 3884b5c65b8SLaurent Vivier status); /* V*A6 */ 3894b5c65b8SLaurent Vivier fp2 = floatx80_mul(fp2, float64_to_floatx80( 3904b5c65b8SLaurent Vivier make_float64(0xBFC555B5848CB7DB), status), 3914b5c65b8SLaurent Vivier status); /* V*A5 */ 3924b5c65b8SLaurent Vivier fp1 = floatx80_add(fp1, float64_to_floatx80( 3934b5c65b8SLaurent Vivier make_float64(0x3FC99999987D8730), status), 3944b5c65b8SLaurent Vivier status); /* A4+V*A6 */ 3954b5c65b8SLaurent Vivier fp2 = floatx80_add(fp2, float64_to_floatx80( 3964b5c65b8SLaurent Vivier make_float64(0xBFCFFFFFFF6F7E97), status), 3974b5c65b8SLaurent Vivier status); /* A3+V*A5 */ 3984b5c65b8SLaurent Vivier fp1 = floatx80_mul(fp1, fp3, status); /* V*(A4+V*A6) */ 3994b5c65b8SLaurent Vivier fp2 = floatx80_mul(fp2, fp3, status); /* V*(A3+V*A5) */ 4004b5c65b8SLaurent Vivier fp1 = floatx80_add(fp1, float64_to_floatx80( 4014b5c65b8SLaurent Vivier make_float64(0x3FD55555555555A4), status), 4024b5c65b8SLaurent Vivier status); /* A2+V*(A4+V*A6) */ 4034b5c65b8SLaurent Vivier fp2 = floatx80_add(fp2, float64_to_floatx80( 4044b5c65b8SLaurent Vivier make_float64(0xBFE0000000000008), status), 4054b5c65b8SLaurent Vivier status); /* A1+V*(A3+V*A5) */ 4064b5c65b8SLaurent Vivier fp1 = floatx80_mul(fp1, fp3, status); /* V*(A2+V*(A4+V*A6)) */ 4074b5c65b8SLaurent Vivier fp2 = floatx80_mul(fp2, fp3, status); /* V*(A1+V*(A3+V*A5)) */ 4084b5c65b8SLaurent Vivier fp1 = floatx80_mul(fp1, fp0, status); /* U*V*(A2+V*(A4+V*A6)) */ 4094b5c65b8SLaurent Vivier fp0 = floatx80_add(fp0, fp2, status); /* U+V*(A1+V*(A3+V*A5)) */ 4104b5c65b8SLaurent Vivier 4114b5c65b8SLaurent Vivier fp1 = floatx80_add(fp1, log_tbl[j + 1], 4124b5c65b8SLaurent Vivier status); /* LOG(F)+U*V*(A2+V*(A4+V*A6)) */ 4134b5c65b8SLaurent Vivier fp0 = floatx80_add(fp0, fp1, status); /* FP0 IS LOG(F) + LOG(1+U) */ 4144b5c65b8SLaurent Vivier 4154b5c65b8SLaurent Vivier status->float_rounding_mode = user_rnd_mode; 4164b5c65b8SLaurent Vivier status->floatx80_rounding_precision = user_rnd_prec; 4174b5c65b8SLaurent Vivier 4184b5c65b8SLaurent Vivier a = floatx80_add(fp0, klog2, status); 4194b5c65b8SLaurent Vivier 4204b5c65b8SLaurent Vivier float_raise(float_flag_inexact, status); 4214b5c65b8SLaurent Vivier 4224b5c65b8SLaurent Vivier return a; 4234b5c65b8SLaurent Vivier } else if (compact < 0x3FFEF07D || compact > 0x3FFF8841) { 4244b5c65b8SLaurent Vivier /* |X| < 1/16 or |X| > -1/16 */ 4254b5c65b8SLaurent Vivier /* LP1CARE */ 4264b5c65b8SLaurent Vivier fSig = (aSig & LIT64(0xFE00000000000000)) | LIT64(0x0100000000000000); 4274b5c65b8SLaurent Vivier f = packFloatx80(0, 0x3FFF, fSig); /* F */ 4284b5c65b8SLaurent Vivier j = (fSig >> 56) & 0x7E; /* DISPLACEMENT FOR 1/F */ 4294b5c65b8SLaurent Vivier 4304b5c65b8SLaurent Vivier if (compact >= 0x3FFF8000) { /* 1+Z >= 1 */ 4314b5c65b8SLaurent Vivier /* KISZERO */ 4324b5c65b8SLaurent Vivier fp0 = floatx80_sub(float32_to_floatx80(make_float32(0x3F800000), 4334b5c65b8SLaurent Vivier status), f, status); /* 1-F */ 4344b5c65b8SLaurent Vivier fp0 = floatx80_add(fp0, fp1, status); /* FP0 IS Y-F = (1-F)+Z */ 4354b5c65b8SLaurent Vivier fp1 = packFloatx80(0, 0, 0); /* K = 0 */ 4364b5c65b8SLaurent Vivier } else { 4374b5c65b8SLaurent Vivier /* KISNEG */ 4384b5c65b8SLaurent Vivier fp0 = floatx80_sub(float32_to_floatx80(make_float32(0x40000000), 4394b5c65b8SLaurent Vivier status), f, status); /* 2-F */ 4404b5c65b8SLaurent Vivier fp1 = floatx80_add(fp1, fp1, status); /* 2Z */ 4414b5c65b8SLaurent Vivier fp0 = floatx80_add(fp0, fp1, status); /* FP0 IS Y-F = (2-F)+2Z */ 4424b5c65b8SLaurent Vivier fp1 = packFloatx80(1, one_exp, one_sig); /* K = -1 */ 4434b5c65b8SLaurent Vivier } 4444b5c65b8SLaurent Vivier goto lp1cont1; 4454b5c65b8SLaurent Vivier } else { 4464b5c65b8SLaurent Vivier /* LP1ONE16 */ 4474b5c65b8SLaurent Vivier fp1 = floatx80_add(fp1, fp1, status); /* FP1 IS 2Z */ 4484b5c65b8SLaurent Vivier fp0 = floatx80_add(fp0, float32_to_floatx80(make_float32(0x3F800000), 4494b5c65b8SLaurent Vivier status), status); /* FP0 IS 1+X */ 4504b5c65b8SLaurent Vivier 4514b5c65b8SLaurent Vivier /* LP1CONT2 */ 4524b5c65b8SLaurent Vivier fp1 = floatx80_div(fp1, fp0, status); /* U */ 4534b5c65b8SLaurent Vivier saveu = fp1; 4544b5c65b8SLaurent Vivier fp0 = floatx80_mul(fp1, fp1, status); /* FP0 IS V = U*U */ 4554b5c65b8SLaurent Vivier fp1 = floatx80_mul(fp0, fp0, status); /* FP1 IS W = V*V */ 4564b5c65b8SLaurent Vivier 4574b5c65b8SLaurent Vivier fp3 = float64_to_floatx80(make_float64(0x3F175496ADD7DAD6), 4584b5c65b8SLaurent Vivier status); /* B5 */ 4594b5c65b8SLaurent Vivier fp2 = float64_to_floatx80(make_float64(0x3F3C71C2FE80C7E0), 4604b5c65b8SLaurent Vivier status); /* B4 */ 4614b5c65b8SLaurent Vivier fp3 = floatx80_mul(fp3, fp1, status); /* W*B5 */ 4624b5c65b8SLaurent Vivier fp2 = floatx80_mul(fp2, fp1, status); /* W*B4 */ 4634b5c65b8SLaurent Vivier fp3 = floatx80_add(fp3, float64_to_floatx80( 4644b5c65b8SLaurent Vivier make_float64(0x3F624924928BCCFF), status), 4654b5c65b8SLaurent Vivier status); /* B3+W*B5 */ 4664b5c65b8SLaurent Vivier fp2 = floatx80_add(fp2, float64_to_floatx80( 4674b5c65b8SLaurent Vivier make_float64(0x3F899999999995EC), status), 4684b5c65b8SLaurent Vivier status); /* B2+W*B4 */ 4694b5c65b8SLaurent Vivier fp1 = floatx80_mul(fp1, fp3, status); /* W*(B3+W*B5) */ 4704b5c65b8SLaurent Vivier fp2 = floatx80_mul(fp2, fp0, status); /* V*(B2+W*B4) */ 4714b5c65b8SLaurent Vivier fp1 = floatx80_add(fp1, float64_to_floatx80( 4724b5c65b8SLaurent Vivier make_float64(0x3FB5555555555555), status), 4734b5c65b8SLaurent Vivier status); /* B1+W*(B3+W*B5) */ 4744b5c65b8SLaurent Vivier 4754b5c65b8SLaurent Vivier fp0 = floatx80_mul(fp0, saveu, status); /* FP0 IS U*V */ 4764b5c65b8SLaurent Vivier fp1 = floatx80_add(fp1, fp2, 4774b5c65b8SLaurent Vivier status); /* B1+W*(B3+W*B5) + V*(B2+W*B4) */ 4784b5c65b8SLaurent Vivier fp0 = floatx80_mul(fp0, fp1, 4794b5c65b8SLaurent Vivier status); /* U*V*([B1+W*(B3+W*B5)] + [V*(B2+W*B4)]) */ 4804b5c65b8SLaurent Vivier 4814b5c65b8SLaurent Vivier status->float_rounding_mode = user_rnd_mode; 4824b5c65b8SLaurent Vivier status->floatx80_rounding_precision = user_rnd_prec; 4834b5c65b8SLaurent Vivier 4844b5c65b8SLaurent Vivier a = floatx80_add(fp0, saveu, status); 4854b5c65b8SLaurent Vivier 4864b5c65b8SLaurent Vivier /*if (!floatx80_is_zero(a)) { */ 4874b5c65b8SLaurent Vivier float_raise(float_flag_inexact, status); 4884b5c65b8SLaurent Vivier /*} */ 4894b5c65b8SLaurent Vivier 4904b5c65b8SLaurent Vivier return a; 4914b5c65b8SLaurent Vivier } 4924b5c65b8SLaurent Vivier } 49350067bd1SLaurent Vivier 49450067bd1SLaurent Vivier /*---------------------------------------------------------------------------- 49550067bd1SLaurent Vivier | Log base e 49650067bd1SLaurent Vivier *----------------------------------------------------------------------------*/ 49750067bd1SLaurent Vivier 49850067bd1SLaurent Vivier floatx80 floatx80_logn(floatx80 a, float_status *status) 49950067bd1SLaurent Vivier { 50050067bd1SLaurent Vivier flag aSign; 50150067bd1SLaurent Vivier int32_t aExp; 50250067bd1SLaurent Vivier uint64_t aSig, fSig; 50350067bd1SLaurent Vivier 50450067bd1SLaurent Vivier int8_t user_rnd_mode, user_rnd_prec; 50550067bd1SLaurent Vivier 50650067bd1SLaurent Vivier int32_t compact, j, k, adjk; 50750067bd1SLaurent Vivier floatx80 fp0, fp1, fp2, fp3, f, logof2, klog2, saveu; 50850067bd1SLaurent Vivier 50950067bd1SLaurent Vivier aSig = extractFloatx80Frac(a); 51050067bd1SLaurent Vivier aExp = extractFloatx80Exp(a); 51150067bd1SLaurent Vivier aSign = extractFloatx80Sign(a); 51250067bd1SLaurent Vivier 51350067bd1SLaurent Vivier if (aExp == 0x7FFF) { 51450067bd1SLaurent Vivier if ((uint64_t) (aSig << 1)) { 51550067bd1SLaurent Vivier propagateFloatx80NaNOneArg(a, status); 51650067bd1SLaurent Vivier } 51750067bd1SLaurent Vivier if (aSign == 0) { 51850067bd1SLaurent Vivier return packFloatx80(0, floatx80_infinity.high, 51950067bd1SLaurent Vivier floatx80_infinity.low); 52050067bd1SLaurent Vivier } 52150067bd1SLaurent Vivier } 52250067bd1SLaurent Vivier 52350067bd1SLaurent Vivier adjk = 0; 52450067bd1SLaurent Vivier 52550067bd1SLaurent Vivier if (aExp == 0) { 52650067bd1SLaurent Vivier if (aSig == 0) { /* zero */ 52750067bd1SLaurent Vivier float_raise(float_flag_divbyzero, status); 52850067bd1SLaurent Vivier return packFloatx80(1, floatx80_infinity.high, 52950067bd1SLaurent Vivier floatx80_infinity.low); 53050067bd1SLaurent Vivier } 53150067bd1SLaurent Vivier if ((aSig & one_sig) == 0) { /* denormal */ 53250067bd1SLaurent Vivier normalizeFloatx80Subnormal(aSig, &aExp, &aSig); 53350067bd1SLaurent Vivier adjk = -100; 53450067bd1SLaurent Vivier aExp += 100; 53550067bd1SLaurent Vivier a = packFloatx80(aSign, aExp, aSig); 53650067bd1SLaurent Vivier } 53750067bd1SLaurent Vivier } 53850067bd1SLaurent Vivier 53950067bd1SLaurent Vivier if (aSign) { 54050067bd1SLaurent Vivier float_raise(float_flag_invalid, status); 54150067bd1SLaurent Vivier return floatx80_default_nan(status); 54250067bd1SLaurent Vivier } 54350067bd1SLaurent Vivier 54450067bd1SLaurent Vivier user_rnd_mode = status->float_rounding_mode; 54550067bd1SLaurent Vivier user_rnd_prec = status->floatx80_rounding_precision; 54650067bd1SLaurent Vivier status->float_rounding_mode = float_round_nearest_even; 54750067bd1SLaurent Vivier status->floatx80_rounding_precision = 80; 54850067bd1SLaurent Vivier 54950067bd1SLaurent Vivier compact = floatx80_make_compact(aExp, aSig); 55050067bd1SLaurent Vivier 55150067bd1SLaurent Vivier if (compact < 0x3FFEF07D || compact > 0x3FFF8841) { 55250067bd1SLaurent Vivier /* |X| < 15/16 or |X| > 17/16 */ 55350067bd1SLaurent Vivier k = aExp - 0x3FFF; 55450067bd1SLaurent Vivier k += adjk; 55550067bd1SLaurent Vivier fp1 = int32_to_floatx80(k, status); 55650067bd1SLaurent Vivier 55750067bd1SLaurent Vivier fSig = (aSig & LIT64(0xFE00000000000000)) | LIT64(0x0100000000000000); 55850067bd1SLaurent Vivier j = (fSig >> 56) & 0x7E; /* DISPLACEMENT FOR 1/F */ 55950067bd1SLaurent Vivier 56050067bd1SLaurent Vivier f = packFloatx80(0, 0x3FFF, fSig); /* F */ 56150067bd1SLaurent Vivier fp0 = packFloatx80(0, 0x3FFF, aSig); /* Y */ 56250067bd1SLaurent Vivier 56350067bd1SLaurent Vivier fp0 = floatx80_sub(fp0, f, status); /* Y-F */ 56450067bd1SLaurent Vivier 56550067bd1SLaurent Vivier /* LP1CONT1 */ 56650067bd1SLaurent Vivier fp0 = floatx80_mul(fp0, log_tbl[j], status); /* FP0 IS U = (Y-F)/F */ 56750067bd1SLaurent Vivier logof2 = packFloatx80(0, 0x3FFE, LIT64(0xB17217F7D1CF79AC)); 56850067bd1SLaurent Vivier klog2 = floatx80_mul(fp1, logof2, status); /* FP1 IS K*LOG2 */ 56950067bd1SLaurent Vivier fp2 = floatx80_mul(fp0, fp0, status); /* FP2 IS V=U*U */ 57050067bd1SLaurent Vivier 57150067bd1SLaurent Vivier fp3 = fp2; 57250067bd1SLaurent Vivier fp1 = fp2; 57350067bd1SLaurent Vivier 57450067bd1SLaurent Vivier fp1 = floatx80_mul(fp1, float64_to_floatx80( 57550067bd1SLaurent Vivier make_float64(0x3FC2499AB5E4040B), status), 57650067bd1SLaurent Vivier status); /* V*A6 */ 57750067bd1SLaurent Vivier fp2 = floatx80_mul(fp2, float64_to_floatx80( 57850067bd1SLaurent Vivier make_float64(0xBFC555B5848CB7DB), status), 57950067bd1SLaurent Vivier status); /* V*A5 */ 58050067bd1SLaurent Vivier fp1 = floatx80_add(fp1, float64_to_floatx80( 58150067bd1SLaurent Vivier make_float64(0x3FC99999987D8730), status), 58250067bd1SLaurent Vivier status); /* A4+V*A6 */ 58350067bd1SLaurent Vivier fp2 = floatx80_add(fp2, float64_to_floatx80( 58450067bd1SLaurent Vivier make_float64(0xBFCFFFFFFF6F7E97), status), 58550067bd1SLaurent Vivier status); /* A3+V*A5 */ 58650067bd1SLaurent Vivier fp1 = floatx80_mul(fp1, fp3, status); /* V*(A4+V*A6) */ 58750067bd1SLaurent Vivier fp2 = floatx80_mul(fp2, fp3, status); /* V*(A3+V*A5) */ 58850067bd1SLaurent Vivier fp1 = floatx80_add(fp1, float64_to_floatx80( 58950067bd1SLaurent Vivier make_float64(0x3FD55555555555A4), status), 59050067bd1SLaurent Vivier status); /* A2+V*(A4+V*A6) */ 59150067bd1SLaurent Vivier fp2 = floatx80_add(fp2, float64_to_floatx80( 59250067bd1SLaurent Vivier make_float64(0xBFE0000000000008), status), 59350067bd1SLaurent Vivier status); /* A1+V*(A3+V*A5) */ 59450067bd1SLaurent Vivier fp1 = floatx80_mul(fp1, fp3, status); /* V*(A2+V*(A4+V*A6)) */ 59550067bd1SLaurent Vivier fp2 = floatx80_mul(fp2, fp3, status); /* V*(A1+V*(A3+V*A5)) */ 59650067bd1SLaurent Vivier fp1 = floatx80_mul(fp1, fp0, status); /* U*V*(A2+V*(A4+V*A6)) */ 59750067bd1SLaurent Vivier fp0 = floatx80_add(fp0, fp2, status); /* U+V*(A1+V*(A3+V*A5)) */ 59850067bd1SLaurent Vivier 59950067bd1SLaurent Vivier fp1 = floatx80_add(fp1, log_tbl[j + 1], 60050067bd1SLaurent Vivier status); /* LOG(F)+U*V*(A2+V*(A4+V*A6)) */ 60150067bd1SLaurent Vivier fp0 = floatx80_add(fp0, fp1, status); /* FP0 IS LOG(F) + LOG(1+U) */ 60250067bd1SLaurent Vivier 60350067bd1SLaurent Vivier status->float_rounding_mode = user_rnd_mode; 60450067bd1SLaurent Vivier status->floatx80_rounding_precision = user_rnd_prec; 60550067bd1SLaurent Vivier 60650067bd1SLaurent Vivier a = floatx80_add(fp0, klog2, status); 60750067bd1SLaurent Vivier 60850067bd1SLaurent Vivier float_raise(float_flag_inexact, status); 60950067bd1SLaurent Vivier 61050067bd1SLaurent Vivier return a; 61150067bd1SLaurent Vivier } else { /* |X-1| >= 1/16 */ 61250067bd1SLaurent Vivier fp0 = a; 61350067bd1SLaurent Vivier fp1 = a; 61450067bd1SLaurent Vivier fp1 = floatx80_sub(fp1, float32_to_floatx80(make_float32(0x3F800000), 61550067bd1SLaurent Vivier status), status); /* FP1 IS X-1 */ 61650067bd1SLaurent Vivier fp0 = floatx80_add(fp0, float32_to_floatx80(make_float32(0x3F800000), 61750067bd1SLaurent Vivier status), status); /* FP0 IS X+1 */ 61850067bd1SLaurent Vivier fp1 = floatx80_add(fp1, fp1, status); /* FP1 IS 2(X-1) */ 61950067bd1SLaurent Vivier 62050067bd1SLaurent Vivier /* LP1CONT2 */ 62150067bd1SLaurent Vivier fp1 = floatx80_div(fp1, fp0, status); /* U */ 62250067bd1SLaurent Vivier saveu = fp1; 62350067bd1SLaurent Vivier fp0 = floatx80_mul(fp1, fp1, status); /* FP0 IS V = U*U */ 62450067bd1SLaurent Vivier fp1 = floatx80_mul(fp0, fp0, status); /* FP1 IS W = V*V */ 62550067bd1SLaurent Vivier 62650067bd1SLaurent Vivier fp3 = float64_to_floatx80(make_float64(0x3F175496ADD7DAD6), 62750067bd1SLaurent Vivier status); /* B5 */ 62850067bd1SLaurent Vivier fp2 = float64_to_floatx80(make_float64(0x3F3C71C2FE80C7E0), 62950067bd1SLaurent Vivier status); /* B4 */ 63050067bd1SLaurent Vivier fp3 = floatx80_mul(fp3, fp1, status); /* W*B5 */ 63150067bd1SLaurent Vivier fp2 = floatx80_mul(fp2, fp1, status); /* W*B4 */ 63250067bd1SLaurent Vivier fp3 = floatx80_add(fp3, float64_to_floatx80( 63350067bd1SLaurent Vivier make_float64(0x3F624924928BCCFF), status), 63450067bd1SLaurent Vivier status); /* B3+W*B5 */ 63550067bd1SLaurent Vivier fp2 = floatx80_add(fp2, float64_to_floatx80( 63650067bd1SLaurent Vivier make_float64(0x3F899999999995EC), status), 63750067bd1SLaurent Vivier status); /* B2+W*B4 */ 63850067bd1SLaurent Vivier fp1 = floatx80_mul(fp1, fp3, status); /* W*(B3+W*B5) */ 63950067bd1SLaurent Vivier fp2 = floatx80_mul(fp2, fp0, status); /* V*(B2+W*B4) */ 64050067bd1SLaurent Vivier fp1 = floatx80_add(fp1, float64_to_floatx80( 64150067bd1SLaurent Vivier make_float64(0x3FB5555555555555), status), 64250067bd1SLaurent Vivier status); /* B1+W*(B3+W*B5) */ 64350067bd1SLaurent Vivier 64450067bd1SLaurent Vivier fp0 = floatx80_mul(fp0, saveu, status); /* FP0 IS U*V */ 64550067bd1SLaurent Vivier fp1 = floatx80_add(fp1, fp2, status); /* B1+W*(B3+W*B5) + V*(B2+W*B4) */ 64650067bd1SLaurent Vivier fp0 = floatx80_mul(fp0, fp1, 64750067bd1SLaurent Vivier status); /* U*V*([B1+W*(B3+W*B5)] + [V*(B2+W*B4)]) */ 64850067bd1SLaurent Vivier 64950067bd1SLaurent Vivier status->float_rounding_mode = user_rnd_mode; 65050067bd1SLaurent Vivier status->floatx80_rounding_precision = user_rnd_prec; 65150067bd1SLaurent Vivier 65250067bd1SLaurent Vivier a = floatx80_add(fp0, saveu, status); 65350067bd1SLaurent Vivier 65450067bd1SLaurent Vivier /*if (!floatx80_is_zero(a)) { */ 65550067bd1SLaurent Vivier float_raise(float_flag_inexact, status); 65650067bd1SLaurent Vivier /*} */ 65750067bd1SLaurent Vivier 65850067bd1SLaurent Vivier return a; 65950067bd1SLaurent Vivier } 66050067bd1SLaurent Vivier } 661248efb66SLaurent Vivier 662248efb66SLaurent Vivier /*---------------------------------------------------------------------------- 663248efb66SLaurent Vivier | Log base 10 664248efb66SLaurent Vivier *----------------------------------------------------------------------------*/ 665248efb66SLaurent Vivier 666248efb66SLaurent Vivier floatx80 floatx80_log10(floatx80 a, float_status *status) 667248efb66SLaurent Vivier { 668248efb66SLaurent Vivier flag aSign; 669248efb66SLaurent Vivier int32_t aExp; 670248efb66SLaurent Vivier uint64_t aSig; 671248efb66SLaurent Vivier 672248efb66SLaurent Vivier int8_t user_rnd_mode, user_rnd_prec; 673248efb66SLaurent Vivier 674248efb66SLaurent Vivier floatx80 fp0, fp1; 675248efb66SLaurent Vivier 676248efb66SLaurent Vivier aSig = extractFloatx80Frac(a); 677248efb66SLaurent Vivier aExp = extractFloatx80Exp(a); 678248efb66SLaurent Vivier aSign = extractFloatx80Sign(a); 679248efb66SLaurent Vivier 680248efb66SLaurent Vivier if (aExp == 0x7FFF) { 681248efb66SLaurent Vivier if ((uint64_t) (aSig << 1)) { 682248efb66SLaurent Vivier propagateFloatx80NaNOneArg(a, status); 683248efb66SLaurent Vivier } 684248efb66SLaurent Vivier if (aSign == 0) { 685248efb66SLaurent Vivier return packFloatx80(0, floatx80_infinity.high, 686248efb66SLaurent Vivier floatx80_infinity.low); 687248efb66SLaurent Vivier } 688248efb66SLaurent Vivier } 689248efb66SLaurent Vivier 690248efb66SLaurent Vivier if (aExp == 0 && aSig == 0) { 691248efb66SLaurent Vivier float_raise(float_flag_divbyzero, status); 692248efb66SLaurent Vivier return packFloatx80(1, floatx80_infinity.high, 693248efb66SLaurent Vivier floatx80_infinity.low); 694248efb66SLaurent Vivier } 695248efb66SLaurent Vivier 696248efb66SLaurent Vivier if (aSign) { 697248efb66SLaurent Vivier float_raise(float_flag_invalid, status); 698248efb66SLaurent Vivier return floatx80_default_nan(status); 699248efb66SLaurent Vivier } 700248efb66SLaurent Vivier 701248efb66SLaurent Vivier user_rnd_mode = status->float_rounding_mode; 702248efb66SLaurent Vivier user_rnd_prec = status->floatx80_rounding_precision; 703248efb66SLaurent Vivier status->float_rounding_mode = float_round_nearest_even; 704248efb66SLaurent Vivier status->floatx80_rounding_precision = 80; 705248efb66SLaurent Vivier 706248efb66SLaurent Vivier fp0 = floatx80_logn(a, status); 707248efb66SLaurent Vivier fp1 = packFloatx80(0, 0x3FFD, LIT64(0xDE5BD8A937287195)); /* INV_L10 */ 708248efb66SLaurent Vivier 709248efb66SLaurent Vivier status->float_rounding_mode = user_rnd_mode; 710248efb66SLaurent Vivier status->floatx80_rounding_precision = user_rnd_prec; 711248efb66SLaurent Vivier 712248efb66SLaurent Vivier a = floatx80_mul(fp0, fp1, status); /* LOGN(X)*INV_L10 */ 713248efb66SLaurent Vivier 714248efb66SLaurent Vivier float_raise(float_flag_inexact, status); 715248efb66SLaurent Vivier 716248efb66SLaurent Vivier return a; 717248efb66SLaurent Vivier } 718*67b453edSLaurent Vivier 719*67b453edSLaurent Vivier /*---------------------------------------------------------------------------- 720*67b453edSLaurent Vivier | Log base 2 721*67b453edSLaurent Vivier *----------------------------------------------------------------------------*/ 722*67b453edSLaurent Vivier 723*67b453edSLaurent Vivier floatx80 floatx80_log2(floatx80 a, float_status *status) 724*67b453edSLaurent Vivier { 725*67b453edSLaurent Vivier flag aSign; 726*67b453edSLaurent Vivier int32_t aExp; 727*67b453edSLaurent Vivier uint64_t aSig; 728*67b453edSLaurent Vivier 729*67b453edSLaurent Vivier int8_t user_rnd_mode, user_rnd_prec; 730*67b453edSLaurent Vivier 731*67b453edSLaurent Vivier floatx80 fp0, fp1; 732*67b453edSLaurent Vivier 733*67b453edSLaurent Vivier aSig = extractFloatx80Frac(a); 734*67b453edSLaurent Vivier aExp = extractFloatx80Exp(a); 735*67b453edSLaurent Vivier aSign = extractFloatx80Sign(a); 736*67b453edSLaurent Vivier 737*67b453edSLaurent Vivier if (aExp == 0x7FFF) { 738*67b453edSLaurent Vivier if ((uint64_t) (aSig << 1)) { 739*67b453edSLaurent Vivier propagateFloatx80NaNOneArg(a, status); 740*67b453edSLaurent Vivier } 741*67b453edSLaurent Vivier if (aSign == 0) { 742*67b453edSLaurent Vivier return packFloatx80(0, floatx80_infinity.high, 743*67b453edSLaurent Vivier floatx80_infinity.low); 744*67b453edSLaurent Vivier } 745*67b453edSLaurent Vivier } 746*67b453edSLaurent Vivier 747*67b453edSLaurent Vivier if (aExp == 0) { 748*67b453edSLaurent Vivier if (aSig == 0) { 749*67b453edSLaurent Vivier float_raise(float_flag_divbyzero, status); 750*67b453edSLaurent Vivier return packFloatx80(1, floatx80_infinity.high, 751*67b453edSLaurent Vivier floatx80_infinity.low); 752*67b453edSLaurent Vivier } 753*67b453edSLaurent Vivier normalizeFloatx80Subnormal(aSig, &aExp, &aSig); 754*67b453edSLaurent Vivier } 755*67b453edSLaurent Vivier 756*67b453edSLaurent Vivier if (aSign) { 757*67b453edSLaurent Vivier float_raise(float_flag_invalid, status); 758*67b453edSLaurent Vivier return floatx80_default_nan(status); 759*67b453edSLaurent Vivier } 760*67b453edSLaurent Vivier 761*67b453edSLaurent Vivier user_rnd_mode = status->float_rounding_mode; 762*67b453edSLaurent Vivier user_rnd_prec = status->floatx80_rounding_precision; 763*67b453edSLaurent Vivier status->float_rounding_mode = float_round_nearest_even; 764*67b453edSLaurent Vivier status->floatx80_rounding_precision = 80; 765*67b453edSLaurent Vivier 766*67b453edSLaurent Vivier if (aSig == one_sig) { /* X is 2^k */ 767*67b453edSLaurent Vivier status->float_rounding_mode = user_rnd_mode; 768*67b453edSLaurent Vivier status->floatx80_rounding_precision = user_rnd_prec; 769*67b453edSLaurent Vivier 770*67b453edSLaurent Vivier a = int32_to_floatx80(aExp - 0x3FFF, status); 771*67b453edSLaurent Vivier } else { 772*67b453edSLaurent Vivier fp0 = floatx80_logn(a, status); 773*67b453edSLaurent Vivier fp1 = packFloatx80(0, 0x3FFF, LIT64(0xB8AA3B295C17F0BC)); /* INV_L2 */ 774*67b453edSLaurent Vivier 775*67b453edSLaurent Vivier status->float_rounding_mode = user_rnd_mode; 776*67b453edSLaurent Vivier status->floatx80_rounding_precision = user_rnd_prec; 777*67b453edSLaurent Vivier 778*67b453edSLaurent Vivier a = floatx80_mul(fp0, fp1, status); /* LOGN(X)*INV_L2 */ 779*67b453edSLaurent Vivier } 780*67b453edSLaurent Vivier 781*67b453edSLaurent Vivier float_raise(float_flag_inexact, status); 782*67b453edSLaurent Vivier 783*67b453edSLaurent Vivier return a; 784*67b453edSLaurent Vivier } 785