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dp_tint.c


products/Sources/formale Sprachen/C/Linux/arch/mips/math-emu/dp_tint.c

// 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. */ #include "ieee754dp.h" int ieee754dp_tint(union ieee754dp x) { u64 residue; int round; int sticky; int odd; COMPXDP; ieee754_clearcx(); EXPLODEXDP; FLUSHXDP; switch (xc) { case IEEE754_CLASS_SNAN: case IEEE754_CLASS_QNAN: ieee754_setcx(IEEE754_INVALID_OPERATION); return ieee754si_indef(); case IEEE754_CLASS_INF: ieee754_setcx(IEEE754_INVALID_OPERATION); return ieee754si_overflow(xs); case IEEE754_CLASS_ZERO: return 0; case IEEE754_CLASS_DNORM: case IEEE754_CLASS_NORM: break; } if (xe > 31) { /* Set invalid. We will only use overflow for floating point overflow */ ieee754_setcx(IEEE754_INVALID_OPERATION); return ieee754si_overflow(xs); } /* oh gawd */ if (xe > DP_FBITS) { xm <<= xe - DP_FBITS; } else if (xe < DP_FBITS) { 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; } /* Note: At this point upper 32 bits of xm are guaranteed to be zero */ odd = (xm & 0x1) != 0x0; switch (ieee754_csr.rm) { case FPU_CSR_RN: if (round && (sticky || odd)) xm++; break; case FPU_CSR_RZ: 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; } /* look for valid corner case 0x80000000 */ if ((xm >> 31) != 0 && (xs == 0 || xm != 0x80000000)) { /* This can happen after rounding */ ieee754_setcx(IEEE754_INVALID_OPERATION); return ieee754si_overflow(xs); } if (round || sticky) ieee754_setcx(IEEE754_INEXACT); } if (xs) return -xm; else return xm; }

                                                                                                                                                                                                                                                                                                                                                                                                     

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