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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879// SPDX-License-Identifier: GPL-2.0-only/* IEEE754 floating point arithmetic * double precision: common utilities *//* * MIPS floating point support * Copyright (C) 1994-2000 Algorithmics Ltd. * Copyright (C) 2017 Imagination Technologies, Ltd. * Author: Aleksandar Markovic <aleksandar.markovic@imgtec.com> */
#include "ieee754dp.h"
union ieee754dp ieee754dp_rint(union ieee754dp x){ union ieee754dp ret; u64 residue; int sticky; int round; int odd;
COMPXDP;
ieee754_clearcx();
EXPLODEXDP; FLUSHXDP;
if (xc == IEEE754_CLASS_SNAN) return ieee754dp_nanxcpt(x);
if ((xc == IEEE754_CLASS_QNAN) || (xc == IEEE754_CLASS_INF) || (xc == IEEE754_CLASS_ZERO)) return x;
if (xe >= DP_FBITS) return x;
if (xe < -1) { residue = xm; round = 0; sticky = residue != 0; xm = 0; } else { residue = xm << (64 - DP_FBITS + xe); round = (residue >> 63) != 0; sticky = (residue << 1) != 0; xm >>= DP_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 = ieee754dp_flong(xm); DPSIGN(ret) = xs;
return ret;}