1 /* This file is distributed under the University of Illinois Open Source 2 * License. See LICENSE.TXT for details. 3 */ 4 5 #include "DD.h" 6 #include "../int_math.h" 7 8 #define makeFinite(x) { \ 9 (x).s.hi = crt_copysign(crt_isinf((x).s.hi) ? 1.0 : 0.0, (x).s.hi); \ 10 (x).s.lo = 0.0; \ 11 } 12 13 #define zeroNaN(x) { \ 14 if (crt_isnan((x).s.hi)) { \ 15 (x).s.hi = crt_copysign(0.0, (x).s.hi); \ 16 (x).s.lo = 0.0; \ 17 } \ 18 } 19 20 long double _Complex 21 __multc3(long double a, long double b, long double c, long double d) 22 { 23 long double ac = __gcc_qmul(a,c); 24 long double bd = __gcc_qmul(b,d); 25 long double ad = __gcc_qmul(a,d); 26 long double bc = __gcc_qmul(b,c); 27 28 DD real = { .ld = __gcc_qsub(ac,bd) }; 29 DD imag = { .ld = __gcc_qadd(ad,bc) }; 30 31 if (crt_isnan(real.s.hi) && crt_isnan(imag.s.hi)) 32 { 33 int recalc = 0; 34 35 DD aDD = { .ld = a }; 36 DD bDD = { .ld = b }; 37 DD cDD = { .ld = c }; 38 DD dDD = { .ld = d }; 39 40 if (crt_isinf(aDD.s.hi) || crt_isinf(bDD.s.hi)) 41 { 42 makeFinite(aDD); 43 makeFinite(bDD); 44 zeroNaN(cDD); 45 zeroNaN(dDD); 46 recalc = 1; 47 } 48 49 if (crt_isinf(cDD.s.hi) || crt_isinf(dDD.s.hi)) 50 { 51 makeFinite(cDD); 52 makeFinite(dDD); 53 zeroNaN(aDD); 54 zeroNaN(bDD); 55 recalc = 1; 56 } 57 58 if (!recalc) 59 { 60 DD acDD = { .ld = ac }; 61 DD bdDD = { .ld = bd }; 62 DD adDD = { .ld = ad }; 63 DD bcDD = { .ld = bc }; 64 65 if (crt_isinf(acDD.s.hi) || crt_isinf(bdDD.s.hi) || 66 crt_isinf(adDD.s.hi) || crt_isinf(bcDD.s.hi)) 67 { 68 zeroNaN(aDD); 69 zeroNaN(bDD); 70 zeroNaN(cDD); 71 zeroNaN(dDD); 72 recalc = 1; 73 } 74 } 75 76 if (recalc) 77 { 78 real.s.hi = CRT_INFINITY * (aDD.s.hi*cDD.s.hi - bDD.s.hi*dDD.s.hi); 79 real.s.lo = 0.0; 80 imag.s.hi = CRT_INFINITY * (aDD.s.hi*dDD.s.hi + bDD.s.hi*cDD.s.hi); 81 imag.s.lo = 0.0; 82 } 83 } 84 85 long double _Complex z; 86 __real__ z = real.ld; 87 __imag__ z = imag.ld; 88 89 return z; 90 } 91
