--- zzzz-none-000/linux-3.10.107/arch/mips/math-emu/ieee754sp.c 2017-06-27 09:49:32.000000000 +0000 +++ scorpion-7490-727/linux-3.10.107/arch/mips/math-emu/ieee754sp.c 2021-02-04 17:41:59.000000000 +0000 @@ -5,8 +5,6 @@ * MIPS floating point support * Copyright (C) 1994-2000 Algorithmics Ltd. * - * ######################################################################## - * * This program is free software; you can distribute it and/or modify it * under the terms of the GNU General Public License (Version 2) as * published by the Free Software Foundation. @@ -18,105 +16,61 @@ * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., - * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. - * - * ######################################################################## + * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. */ +#include #include "ieee754sp.h" -int ieee754sp_class(ieee754sp x) +int ieee754sp_class(union ieee754sp x) { COMPXSP; EXPLODEXSP; return xc; } -int ieee754sp_isnan(ieee754sp x) +static inline int ieee754sp_isnan(union ieee754sp x) { - return ieee754sp_class(x) >= IEEE754_CLASS_SNAN; + return ieee754_class_nan(ieee754sp_class(x)); } -int ieee754sp_issnan(ieee754sp x) +static inline int ieee754sp_issnan(union ieee754sp x) { assert(ieee754sp_isnan(x)); - return (SPMANT(x) & SP_MBIT(SP_MBITS-1)); -} - - -ieee754sp ieee754sp_xcpt(ieee754sp r, const char *op, ...) -{ - struct ieee754xctx ax; - - if (!TSTX()) - return r; - - ax.op = op; - ax.rt = IEEE754_RT_SP; - ax.rv.sp = r; - va_start(ax.ap, op); - ieee754_xcpt(&ax); - va_end(ax.ap); - return ax.rv.sp; + return SPMANT(x) & SP_MBIT(SP_FBITS - 1); } -ieee754sp ieee754sp_nanxcpt(ieee754sp r, const char *op, ...) -{ - struct ieee754xctx ax; - - assert(ieee754sp_isnan(r)); - if (!ieee754sp_issnan(r)) /* QNAN does not cause invalid op !! */ - return r; - - if (!SETANDTESTCX(IEEE754_INVALID_OPERATION)) { - /* not enabled convert to a quiet NaN */ - SPMANT(r) &= (~SP_MBIT(SP_MBITS-1)); - if (ieee754sp_isnan(r)) - return r; - else - return ieee754sp_indef(); - } - - ax.op = op; - ax.rt = 0; - ax.rv.sp = r; - va_start(ax.ap, op); - ieee754_xcpt(&ax); - va_end(ax.ap); - return ax.rv.sp; -} - -ieee754sp ieee754sp_bestnan(ieee754sp x, ieee754sp y) +/* + * Raise the Invalid Operation IEEE 754 exception + * and convert the signaling NaN supplied to a quiet NaN. + */ +union ieee754sp __cold ieee754sp_nanxcpt(union ieee754sp r) { - assert(ieee754sp_isnan(x)); - assert(ieee754sp_isnan(y)); + assert(ieee754sp_issnan(r)); - if (SPMANT(x) > SPMANT(y)) - return x; - else - return y; + ieee754_setcx(IEEE754_INVALID_OPERATION); + return ieee754sp_indef(); } - -static unsigned get_rounding(int sn, unsigned xm) +static unsigned ieee754sp_get_rounding(int sn, unsigned xm) { /* inexact must round of 3 bits */ if (xm & (SP_MBIT(3) - 1)) { switch (ieee754_csr.rm) { - case IEEE754_RZ: + case FPU_CSR_RZ: break; - case IEEE754_RN: + case FPU_CSR_RN: xm += 0x3 + ((xm >> 3) & 1); /* xm += (xm&0x8)?0x4:0x3 */ break; - case IEEE754_RU: /* toward +Infinity */ + case FPU_CSR_RU: /* toward +Infinity */ if (!sn) /* ?? */ xm += 0x8; break; - case IEEE754_RD: /* toward -Infinity */ + case FPU_CSR_RD: /* toward -Infinity */ if (sn) /* ?? */ xm += 0x8; break; @@ -131,11 +85,11 @@ * xe is an unbiased exponent * xm is 3bit extended precision value. */ -ieee754sp ieee754sp_format(int sn, int xe, unsigned xm) +union ieee754sp ieee754sp_format(int sn, int xe, unsigned xm) { assert(xm); /* we don't gen exact zeros (probably should) */ - assert((xm >> (SP_MBITS + 1 + 3)) == 0); /* no execess */ + assert((xm >> (SP_FBITS + 1 + 3)) == 0); /* no execess */ assert(xm & (SP_HIDDEN_BIT << 3)); if (xe < SP_EMIN) { @@ -143,38 +97,37 @@ int es = SP_EMIN - xe; if (ieee754_csr.nod) { - SETCX(IEEE754_UNDERFLOW); - SETCX(IEEE754_INEXACT); + ieee754_setcx(IEEE754_UNDERFLOW); + ieee754_setcx(IEEE754_INEXACT); switch(ieee754_csr.rm) { - case IEEE754_RN: - case IEEE754_RZ: + case FPU_CSR_RN: + case FPU_CSR_RZ: return ieee754sp_zero(sn); - case IEEE754_RU: /* toward +Infinity */ - if(sn == 0) + case FPU_CSR_RU: /* toward +Infinity */ + if (sn == 0) return ieee754sp_min(0); else return ieee754sp_zero(1); - case IEEE754_RD: /* toward -Infinity */ - if(sn == 0) + case FPU_CSR_RD: /* toward -Infinity */ + if (sn == 0) return ieee754sp_zero(0); else return ieee754sp_min(1); } } - if (xe == SP_EMIN - 1 - && get_rounding(sn, xm) >> (SP_MBITS + 1 + 3)) + if (xe == SP_EMIN - 1 && + ieee754sp_get_rounding(sn, xm) >> (SP_FBITS + 1 + 3)) { /* Not tiny after rounding */ - SETCX(IEEE754_INEXACT); - xm = get_rounding(sn, xm); + ieee754_setcx(IEEE754_INEXACT); + xm = ieee754sp_get_rounding(sn, xm); xm >>= 1; /* Clear grs bits */ xm &= ~(SP_MBIT(3) - 1); xe++; - } - else { + } else { /* sticky right shift es bits */ SPXSRSXn(es); @@ -183,17 +136,17 @@ } } if (xm & (SP_MBIT(3) - 1)) { - SETCX(IEEE754_INEXACT); + ieee754_setcx(IEEE754_INEXACT); if ((xm & (SP_HIDDEN_BIT << 3)) == 0) { - SETCX(IEEE754_UNDERFLOW); + ieee754_setcx(IEEE754_UNDERFLOW); } /* inexact must round of 3 bits */ - xm = get_rounding(sn, xm); + xm = ieee754sp_get_rounding(sn, xm); /* adjust exponent for rounding add overflowing */ - if (xm >> (SP_MBITS + 1 + 3)) { + if (xm >> (SP_FBITS + 1 + 3)) { /* add causes mantissa overflow */ xm >>= 1; xe++; @@ -202,24 +155,24 @@ /* strip grs bits */ xm >>= 3; - assert((xm >> (SP_MBITS + 1)) == 0); /* no execess */ + assert((xm >> (SP_FBITS + 1)) == 0); /* no execess */ assert(xe >= SP_EMIN); if (xe > SP_EMAX) { - SETCX(IEEE754_OVERFLOW); - SETCX(IEEE754_INEXACT); + ieee754_setcx(IEEE754_OVERFLOW); + ieee754_setcx(IEEE754_INEXACT); /* -O can be table indexed by (rm,sn) */ switch (ieee754_csr.rm) { - case IEEE754_RN: + case FPU_CSR_RN: return ieee754sp_inf(sn); - case IEEE754_RZ: + case FPU_CSR_RZ: return ieee754sp_max(sn); - case IEEE754_RU: /* toward +Infinity */ + case FPU_CSR_RU: /* toward +Infinity */ if (sn == 0) return ieee754sp_inf(0); else return ieee754sp_max(1); - case IEEE754_RD: /* toward -Infinity */ + case FPU_CSR_RD: /* toward -Infinity */ if (sn == 0) return ieee754sp_max(0); else @@ -232,10 +185,10 @@ /* we underflow (tiny/zero) */ assert(xe == SP_EMIN); if (ieee754_csr.mx & IEEE754_UNDERFLOW) - SETCX(IEEE754_UNDERFLOW); + ieee754_setcx(IEEE754_UNDERFLOW); return buildsp(sn, SP_EMIN - 1 + SP_EBIAS, xm); } else { - assert((xm >> (SP_MBITS + 1)) == 0); /* no execess */ + assert((xm >> (SP_FBITS + 1)) == 0); /* no execess */ assert(xm & SP_HIDDEN_BIT); return buildsp(sn, xe + SP_EBIAS, xm & ~SP_HIDDEN_BIT);