forked from Minki/linux
ece276de2a
MAC2008 means the processor implemented IEEE754 style Fused MADD instruction. It was introduced in Release3 but removed in Release5. The toolchain support of MAC2008 have never landed except for Loongson processors. This patch aimed to disabled the MAC2008 if it's optional. For MAC2008 only processors, we corrected math-emu behavior to align with actual hardware behavior. Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> [paulburton@kernel.org: Fixup MIPSr2-r5 check in cpu_set_fpu_2008.] Signed-off-by: Paul Burton <paulburton@kernel.org> Cc: linux-mips@vger.kernel.org Cc: chenhc@lemote.com Cc: paul.burton@mips.com Cc: linux-kernel@vger.kernel.org
150 lines
3.5 KiB
C
150 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* IEEE754 floating point
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* common internal header file
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*/
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/*
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* MIPS floating point support
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* Copyright (C) 1994-2000 Algorithmics Ltd.
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*/
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#ifndef __IEEE754INT_H
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#define __IEEE754INT_H
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#include "ieee754.h"
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#define CLPAIR(x, y) ((x)*6+(y))
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enum maddf_flags {
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MADDF_NEGATE_PRODUCT = 1 << 0,
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MADDF_NEGATE_ADDITION = 1 << 1,
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};
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static inline void ieee754_clearcx(void)
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{
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ieee754_csr.cx = 0;
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}
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static inline void ieee754_setcx(const unsigned int flags)
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{
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ieee754_csr.cx |= flags;
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ieee754_csr.sx |= flags;
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}
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static inline int ieee754_setandtestcx(const unsigned int x)
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{
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ieee754_setcx(x);
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return ieee754_csr.mx & x;
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}
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static inline int ieee754_class_nan(int xc)
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{
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return xc >= IEEE754_CLASS_SNAN;
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}
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#define COMPXSP \
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unsigned int xm; int xe; int xs __maybe_unused; int xc
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#define COMPYSP \
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unsigned int ym; int ye; int ys; int yc
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#define COMPZSP \
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unsigned int zm; int ze; int zs; int zc
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#define EXPLODESP(v, vc, vs, ve, vm) \
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{ \
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vs = SPSIGN(v); \
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ve = SPBEXP(v); \
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vm = SPMANT(v); \
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if (ve == SP_EMAX+1+SP_EBIAS) { \
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if (vm == 0) \
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vc = IEEE754_CLASS_INF; \
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else if (ieee754_csr.nan2008 ^ !(vm & SP_MBIT(SP_FBITS - 1))) \
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vc = IEEE754_CLASS_QNAN; \
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else \
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vc = IEEE754_CLASS_SNAN; \
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} else if (ve == SP_EMIN-1+SP_EBIAS) { \
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if (vm) { \
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ve = SP_EMIN; \
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vc = IEEE754_CLASS_DNORM; \
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} else \
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vc = IEEE754_CLASS_ZERO; \
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} else { \
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ve -= SP_EBIAS; \
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vm |= SP_HIDDEN_BIT; \
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vc = IEEE754_CLASS_NORM; \
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} \
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}
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#define EXPLODEXSP EXPLODESP(x, xc, xs, xe, xm)
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#define EXPLODEYSP EXPLODESP(y, yc, ys, ye, ym)
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#define EXPLODEZSP EXPLODESP(z, zc, zs, ze, zm)
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#define COMPXDP \
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u64 xm; int xe; int xs __maybe_unused; int xc
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#define COMPYDP \
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u64 ym; int ye; int ys; int yc
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#define COMPZDP \
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u64 zm; int ze; int zs; int zc
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#define EXPLODEDP(v, vc, vs, ve, vm) \
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{ \
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vm = DPMANT(v); \
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vs = DPSIGN(v); \
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ve = DPBEXP(v); \
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if (ve == DP_EMAX+1+DP_EBIAS) { \
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if (vm == 0) \
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vc = IEEE754_CLASS_INF; \
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else if (ieee754_csr.nan2008 ^ !(vm & DP_MBIT(DP_FBITS - 1))) \
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vc = IEEE754_CLASS_QNAN; \
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else \
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vc = IEEE754_CLASS_SNAN; \
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} else if (ve == DP_EMIN-1+DP_EBIAS) { \
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if (vm) { \
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ve = DP_EMIN; \
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vc = IEEE754_CLASS_DNORM; \
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} else \
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vc = IEEE754_CLASS_ZERO; \
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} else { \
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ve -= DP_EBIAS; \
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vm |= DP_HIDDEN_BIT; \
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vc = IEEE754_CLASS_NORM; \
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} \
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}
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#define EXPLODEXDP EXPLODEDP(x, xc, xs, xe, xm)
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#define EXPLODEYDP EXPLODEDP(y, yc, ys, ye, ym)
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#define EXPLODEZDP EXPLODEDP(z, zc, zs, ze, zm)
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#define FLUSHDP(v, vc, vs, ve, vm) \
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if (vc==IEEE754_CLASS_DNORM) { \
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if (ieee754_csr.nod) { \
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ieee754_setcx(IEEE754_INEXACT); \
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vc = IEEE754_CLASS_ZERO; \
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ve = DP_EMIN-1+DP_EBIAS; \
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vm = 0; \
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v = ieee754dp_zero(vs); \
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} \
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}
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#define FLUSHSP(v, vc, vs, ve, vm) \
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if (vc==IEEE754_CLASS_DNORM) { \
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if (ieee754_csr.nod) { \
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ieee754_setcx(IEEE754_INEXACT); \
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vc = IEEE754_CLASS_ZERO; \
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ve = SP_EMIN-1+SP_EBIAS; \
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vm = 0; \
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v = ieee754sp_zero(vs); \
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} \
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}
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#define FLUSHXDP FLUSHDP(x, xc, xs, xe, xm)
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#define FLUSHYDP FLUSHDP(y, yc, ys, ye, ym)
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#define FLUSHZDP FLUSHDP(z, zc, zs, ze, zm)
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#define FLUSHXSP FLUSHSP(x, xc, xs, xe, xm)
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#define FLUSHYSP FLUSHSP(y, yc, ys, ye, ym)
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#define FLUSHZSP FLUSHSP(z, zc, zs, ze, zm)
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#endif /* __IEEE754INT_H */
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