cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ieee754dp.h (1697B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * IEEE754 floating point
      4 * double precision internal header file
      5 */
      6/*
      7 * MIPS floating point support
      8 * Copyright (C) 1994-2000 Algorithmics Ltd.
      9 */
     10
     11#include <linux/compiler.h>
     12
     13#include "ieee754int.h"
     14
     15#define assert(expr) ((void)0)
     16
     17#define DP_EBIAS	1023
     18#define DP_EMIN		(-1022)
     19#define DP_EMAX		1023
     20#define DP_FBITS	52
     21#define DP_MBITS	52
     22
     23#define DP_MBIT(x)	((u64)1 << (x))
     24#define DP_HIDDEN_BIT	DP_MBIT(DP_FBITS)
     25#define DP_SIGN_BIT	DP_MBIT(63)
     26
     27#define DPSIGN(dp)	(dp.sign)
     28#define DPBEXP(dp)	(dp.bexp)
     29#define DPMANT(dp)	(dp.mant)
     30
     31static inline int ieee754dp_finite(union ieee754dp x)
     32{
     33	return DPBEXP(x) != DP_EMAX + 1 + DP_EBIAS;
     34}
     35
     36/* 3bit extended double precision sticky right shift */
     37#define XDPSRS(v,rs)	\
     38	((rs > (DP_FBITS+3))?1:((v) >> (rs)) | ((v) << (64-(rs)) != 0))
     39
     40#define XDPSRSX1() \
     41	(xe++, (xm = (xm >> 1) | (xm & 1)))
     42
     43#define XDPSRS1(v)	\
     44	(((v) >> 1) | ((v) & 1))
     45
     46/* 32bit * 32bit => 64bit unsigned integer multiplication */
     47#define DPXMULT(x, y)	((u64)(x) * (u64)y)
     48
     49/* convert denormal to normalized with extended exponent */
     50#define DPDNORMx(m,e) \
     51	while ((m >> DP_FBITS) == 0) { m <<= 1; e--; }
     52#define DPDNORMX	DPDNORMx(xm, xe)
     53#define DPDNORMY	DPDNORMx(ym, ye)
     54#define DPDNORMZ	DPDNORMx(zm, ze)
     55
     56static inline union ieee754dp builddp(int s, int bx, u64 m)
     57{
     58	union ieee754dp r;
     59
     60	assert((s) == 0 || (s) == 1);
     61	assert((bx) >= DP_EMIN - 1 + DP_EBIAS
     62	       && (bx) <= DP_EMAX + 1 + DP_EBIAS);
     63	assert(((m) >> DP_FBITS) == 0);
     64
     65	r.sign = s;
     66	r.bexp = bx;
     67	r.mant = m;
     68
     69	return r;
     70}
     71
     72extern union ieee754dp __cold ieee754dp_nanxcpt(union ieee754dp);
     73extern union ieee754dp ieee754dp_format(int, int, u64);