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- // SPDX-License-Identifier: GPL-2.0-only
- /* IEEE754 floating point arithmetic
- * single precision
- */
- /*
- * MIPS floating point support
- * Copyright (C) 1994-2000 Algorithmics Ltd.
- */
- #include "ieee754sp.h"
- #include "ieee754dp.h"
- static inline union ieee754sp ieee754sp_nan_fdp(int xs, u64 xm)
- {
- return buildsp(xs, SP_EMAX + 1 + SP_EBIAS,
- xm >> (DP_FBITS - SP_FBITS));
- }
- union ieee754sp ieee754sp_fdp(union ieee754dp x)
- {
- union ieee754sp y;
- u32 rm;
- COMPXDP;
- COMPYSP;
- EXPLODEXDP;
- ieee754_clearcx();
- FLUSHXDP;
- switch (xc) {
- case IEEE754_CLASS_SNAN:
- x = ieee754dp_nanxcpt(x);
- EXPLODEXDP;
- fallthrough;
- case IEEE754_CLASS_QNAN:
- y = ieee754sp_nan_fdp(xs, xm);
- if (!ieee754_csr.nan2008) {
- EXPLODEYSP;
- if (!ieee754_class_nan(yc))
- y = ieee754sp_indef();
- }
- return y;
- case IEEE754_CLASS_INF:
- return ieee754sp_inf(xs);
- case IEEE754_CLASS_ZERO:
- return ieee754sp_zero(xs);
- case IEEE754_CLASS_DNORM:
- /* can't possibly be sp representable */
- ieee754_setcx(IEEE754_UNDERFLOW);
- ieee754_setcx(IEEE754_INEXACT);
- if ((ieee754_csr.rm == FPU_CSR_RU && !xs) ||
- (ieee754_csr.rm == FPU_CSR_RD && xs))
- return ieee754sp_mind(xs);
- return ieee754sp_zero(xs);
- case IEEE754_CLASS_NORM:
- break;
- }
- /*
- * Convert from DP_FBITS to SP_FBITS+3 with sticky right shift.
- */
- rm = (xm >> (DP_FBITS - (SP_FBITS + 3))) |
- ((xm << (64 - (DP_FBITS - (SP_FBITS + 3)))) != 0);
- return ieee754sp_format(xs, xe, rm);
- }
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