--- zzzz-none-000/linux-3.10.107/arch/mips/math-emu/dp_add.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/mips/math-emu/dp_add.c	2021-02-04 17:41:59.000000000 +0000
@@ -5,8 +5,6 @@
  * MIPS floating point support
  * Copyright (C) 1994-2000 Algorithmics Ltd.
  *
- * ########################################################################
- *
  *  This program is free software; you can distribute it and/or modify it
  *  under the terms of the GNU General Public License (Version 2) as
  *  published by the Free Software Foundation.
@@ -18,42 +16,41 @@
  *
  *  You should have received a copy of the GNU General Public License along
  *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
- *
- * ########################################################################
- *
+ *  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA.
  */
 
-
 #include "ieee754dp.h"
 
-ieee754dp ieee754dp_add(ieee754dp x, ieee754dp y)
+union ieee754dp ieee754dp_add(union ieee754dp x, union ieee754dp y)
 {
+	int s;
+
 	COMPXDP;
 	COMPYDP;
 
 	EXPLODEXDP;
 	EXPLODEYDP;
 
-	CLEARCX;
+	ieee754_clearcx();
 
 	FLUSHXDP;
 	FLUSHYDP;
 
 	switch (CLPAIR(xc, yc)) {
-	case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_QNAN):
 	case CLPAIR(IEEE754_CLASS_QNAN, IEEE754_CLASS_SNAN):
-	case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_SNAN):
 	case CLPAIR(IEEE754_CLASS_ZERO, IEEE754_CLASS_SNAN):
 	case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_SNAN):
 	case CLPAIR(IEEE754_CLASS_DNORM, IEEE754_CLASS_SNAN):
 	case CLPAIR(IEEE754_CLASS_INF, IEEE754_CLASS_SNAN):
+		return ieee754dp_nanxcpt(y);
+
+	case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_SNAN):
+	case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_QNAN):
 	case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_ZERO):
 	case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_NORM):
 	case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_DNORM):
 	case CLPAIR(IEEE754_CLASS_SNAN, IEEE754_CLASS_INF):
-		SETCX(IEEE754_INVALID_OPERATION);
-		return ieee754dp_nanxcpt(ieee754dp_indef(), "add", x, y);
+		return ieee754dp_nanxcpt(x);
 
 	case CLPAIR(IEEE754_CLASS_ZERO, IEEE754_CLASS_QNAN):
 	case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_QNAN):
@@ -69,14 +66,14 @@
 		return x;
 
 
-		/* Infinity handling
-		 */
-
+	/*
+	 * Infinity handling
+	 */
 	case CLPAIR(IEEE754_CLASS_INF, IEEE754_CLASS_INF):
 		if (xs == ys)
 			return x;
-		SETCX(IEEE754_INVALID_OPERATION);
-		return ieee754dp_xcpt(ieee754dp_indef(), "add", x, y);
+		ieee754_setcx(IEEE754_INVALID_OPERATION);
+		return ieee754dp_indef();
 
 	case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_INF):
 	case CLPAIR(IEEE754_CLASS_ZERO, IEEE754_CLASS_INF):
@@ -88,15 +85,14 @@
 	case CLPAIR(IEEE754_CLASS_INF, IEEE754_CLASS_DNORM):
 		return x;
 
-		/* Zero handling
-		 */
-
+	/*
+	 * Zero handling
+	 */
 	case CLPAIR(IEEE754_CLASS_ZERO, IEEE754_CLASS_ZERO):
 		if (xs == ys)
 			return x;
 		else
-			return ieee754dp_zero(ieee754_csr.rm ==
-					      IEEE754_RD);
+			return ieee754dp_zero(ieee754_csr.rm == FPU_CSR_RD);
 
 	case CLPAIR(IEEE754_CLASS_NORM, IEEE754_CLASS_ZERO):
 	case CLPAIR(IEEE754_CLASS_DNORM, IEEE754_CLASS_ZERO):
@@ -125,20 +121,24 @@
 	assert(xm & DP_HIDDEN_BIT);
 	assert(ym & DP_HIDDEN_BIT);
 
-	/* provide guard,round and stick bit space */
+	/*
+	 * Provide guard,round and stick bit space.
+	 */
 	xm <<= 3;
 	ym <<= 3;
 
 	if (xe > ye) {
-		/* have to shift y fraction right to align
+		/*
+		 * Have to shift y fraction right to align.
 		 */
-		int s = xe - ye;
+		s = xe - ye;
 		ym = XDPSRS(ym, s);
 		ye += s;
 	} else if (ye > xe) {
-		/* have to shift x fraction right to align
+		/*
+		 * Have to shift x fraction right to align.
 		 */
-		int s = ye - xe;
+		s = ye - xe;
 		xm = XDPSRS(xm, s);
 		xe += s;
 	}
@@ -146,37 +146,34 @@
 	assert(xe <= DP_EMAX);
 
 	if (xs == ys) {
-		/* generate 28 bit result of adding two 27 bit numbers
-		 * leaving result in xm,xs,xe
+		/*
+		 * Generate 28 bit result of adding two 27 bit numbers
+		 * leaving result in xm, xs and xe.
 		 */
 		xm = xm + ym;
-		xe = xe;
-		xs = xs;
 
-		if (xm >> (DP_MBITS + 1 + 3)) { /* carry out */
+		if (xm >> (DP_FBITS + 1 + 3)) { /* carry out */
 			xm = XDPSRS1(xm);
 			xe++;
 		}
 	} else {
 		if (xm >= ym) {
 			xm = xm - ym;
-			xe = xe;
-			xs = xs;
 		} else {
 			xm = ym - xm;
-			xe = xe;
 			xs = ys;
 		}
 		if (xm == 0)
-			return ieee754dp_zero(ieee754_csr.rm ==
-					      IEEE754_RD);
+			return ieee754dp_zero(ieee754_csr.rm == FPU_CSR_RD);
 
-		/* normalize to rounding precision */
-		while ((xm >> (DP_MBITS + 3)) == 0) {
+		/*
+		 * Normalize to rounding precision.
+		 */
+		while ((xm >> (DP_FBITS + 3)) == 0) {
 			xm <<= 1;
 			xe--;
 		}
-
 	}
-	DPNORMRET2(xs, xe, xm, "add", x, y);
+
+	return ieee754dp_format(xs, xe, xm);
 }