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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dp_cmp.c (936B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/* IEEE754 floating point arithmetic
      3 * double precision: common utilities
      4 */
      5/*
      6 * MIPS floating point support
      7 * Copyright (C) 1994-2000 Algorithmics Ltd.
      8 */
      9
     10#include "ieee754dp.h"
     11
     12int ieee754dp_cmp(union ieee754dp x, union ieee754dp y, int cmp, int sig)
     13{
     14	s64 vx;
     15	s64 vy;
     16
     17	COMPXDP;
     18	COMPYDP;
     19
     20	EXPLODEXDP;
     21	EXPLODEYDP;
     22	FLUSHXDP;
     23	FLUSHYDP;
     24	ieee754_clearcx();	/* Even clear inexact flag here */
     25
     26	if (ieee754_class_nan(xc) || ieee754_class_nan(yc)) {
     27		if (sig ||
     28		    xc == IEEE754_CLASS_SNAN || yc == IEEE754_CLASS_SNAN)
     29			ieee754_setcx(IEEE754_INVALID_OPERATION);
     30		return (cmp & IEEE754_CUN) != 0;
     31	} else {
     32		vx = x.bits;
     33		vy = y.bits;
     34
     35		if (vx < 0)
     36			vx = -vx ^ DP_SIGN_BIT;
     37		if (vy < 0)
     38			vy = -vy ^ DP_SIGN_BIT;
     39
     40		if (vx < vy)
     41			return (cmp & IEEE754_CLT) != 0;
     42		else if (vx == vy)
     43			return (cmp & IEEE754_CEQ) != 0;
     44		else
     45			return (cmp & IEEE754_CGT) != 0;
     46	}
     47}