/* IEEE754 floating point arithmetic * single precision */ /* * MIPS floating point support * Copyright (C) 1994-2000 Algorithmics Ltd. * Copyright (C) 2017 Imagination Technologies, Ltd. * Author: Aleksandar Markovic <aleksandar.markovic@imgtec.com> * * 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. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. * * You should have received a copy of the GNU General Public License along * with this program. */ #include "ieee754sp.h" union ieee754sp ieee754sp_rint(union ieee754sp x) { union ieee754sp ret; u32 residue; int sticky; int round; int odd; COMPXDP; /* <-- DP needed for 64-bit mantissa tmp */ ieee754_clearcx(); EXPLODEXSP; FLUSHXSP; if (xc == IEEE754_CLASS_SNAN) return ieee754sp_nanxcpt(x); if ((xc == IEEE754_CLASS_QNAN) || (xc == IEEE754_CLASS_INF) || (xc == IEEE754_CLASS_ZERO)) return x; if (xe >= SP_FBITS) return x; if (xe < -1) { residue = xm; round = 0; sticky = residue != 0; xm = 0; } else { residue = xm << (xe + 1); residue <<= 31 - SP_FBITS; round = (residue >> 31) != 0; sticky = (residue << 1) != 0; xm >>= SP_FBITS - xe; } odd = (xm & 0x1) != 0x0; switch (ieee754_csr.rm) { case FPU_CSR_RN: /* toward nearest */ if (round && (sticky || odd)) xm++; break; case FPU_CSR_RZ: /* toward zero */ break; case FPU_CSR_RU: /* toward +infinity */ if ((round || sticky) && !xs) xm++; break; case FPU_CSR_RD: /* toward -infinity */ if ((round || sticky) && xs) xm++; break; } if (round || sticky) ieee754_setcx(IEEE754_INEXACT); ret = ieee754sp_flong(xm); SPSIGN(ret) = xs; return ret; }