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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ieee754sp.h (1789B)

      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 SP_EBIAS	127
     18#define SP_EMIN		(-126)
     19#define SP_EMAX		127
     20#define SP_FBITS	23
     21#define SP_MBITS	23
     22
     23#define SP_MBIT(x)	((u32)1 << (x))
     24#define SP_HIDDEN_BIT	SP_MBIT(SP_FBITS)
     25#define SP_SIGN_BIT	SP_MBIT(31)
     26
     27#define SPSIGN(sp)	(sp.sign)
     28#define SPBEXP(sp)	(sp.bexp)
     29#define SPMANT(sp)	(sp.mant)
     30
     31static inline int ieee754sp_finite(union ieee754sp x)
     32{
     33	return SPBEXP(x) != SP_EMAX + 1 + SP_EBIAS;
     34}
     35
     36/* 64 bit right shift with rounding */
     37#define XSPSRS64(v, rs)						\
     38	(((rs) >= 64) ? ((v) != 0) : ((v) >> (rs)) | ((v) << (64-(rs)) != 0))
     39
     40/* 3bit extended single precision sticky right shift */
     41#define XSPSRS(v, rs)						\
     42	((rs > (SP_FBITS+3))?1:((v) >> (rs)) | ((v) << (32-(rs)) != 0))
     43
     44#define XSPSRS1(m) \
     45	((m >> 1) | (m & 1))
     46
     47#define SPXSRSX1() \
     48	(xe++, (xm = XSPSRS1(xm)))
     49
     50#define SPXSRSY1() \
     51	(ye++, (ym = XSPSRS1(ym)))
     52
     53/* convert denormal to normalized with extended exponent */
     54#define SPDNORMx(m,e) \
     55	while ((m >> SP_FBITS) == 0) { m <<= 1; e--; }
     56#define SPDNORMX	SPDNORMx(xm, xe)
     57#define SPDNORMY	SPDNORMx(ym, ye)
     58#define SPDNORMZ	SPDNORMx(zm, ze)
     59
     60static inline union ieee754sp buildsp(int s, int bx, unsigned int m)
     61{
     62	union ieee754sp r;
     63
     64	assert((s) == 0 || (s) == 1);
     65	assert((bx) >= SP_EMIN - 1 + SP_EBIAS
     66	       && (bx) <= SP_EMAX + 1 + SP_EBIAS);
     67	assert(((m) >> SP_FBITS) == 0);
     68
     69	r.sign = s;
     70	r.bexp = bx;
     71	r.mant = m;
     72
     73	return r;
     74}
     75
     76extern union ieee754sp __cold ieee754sp_nanxcpt(union ieee754sp);
     77extern union ieee754sp ieee754sp_format(int, int, unsigned);