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ref: 943e142d5b46b45b782c5ab4e42fc3d79f6f4435
parent: ee260887863628ae373d9fabcddeac3b0071237a
author: cinap_lenrek <cinap_lenrek@felloff.net>
date: Fri May 11 11:37:59 EDT 2018 

libmp: apply fixes for mplogic, mpdiv and mpmagadd from 9front (thanks aiju)


--- a/libmp/mpadd.c
+++ b/libmp/mpadd.c
@@ -25,6 +25,7 @@
 	}
 	if(m == 0){
 		mpassign(b1, sum);
+		sum->sign = 1;
 		return;
 	}
 	mpbits(sum, (n+1)*Dbits);
--- a/libmp/mpdiv.c
+++ b/libmp/mpdiv.c
@@ -9,7 +9,7 @@
 void
 mpdiv(mpint *dividend, mpint *divisor, mpint *quotient, mpint *remainder)
 {
-	int j, s, vn, sign;
+	int j, s, vn, sign, qsign, rsign;
 	mpdigit qd, *up, *vp, *qp;
 	mpint *u, *v, *t;
 
@@ -22,7 +22,9 @@
 
 	// division by one or small powers of two
 	if(divisor->top == 1 && (divisor->p[0] & divisor->p[0]-1) == 0){
-		vlong r = (vlong)dividend->sign * (dividend->p[0] & divisor->p[0]-1);
+		vlong r = 0;
+		if(dividend->top > 0)
+			r = (vlong)dividend->sign * (dividend->p[0] & divisor->p[0]-1);
 		if(quotient != nil){
 			sign = divisor->sign;
 			for(s = 0; ((divisor->p[0] >> s) & 1) == 0; s++)
@@ -47,6 +49,9 @@
 			mpassign(mpzero, quotient);
 		return;
 	}
+	
+	qsign = divisor->sign * dividend->sign;
+	rsign = dividend->sign;
 
 	// D1: shift until divisor, v, has hi bit set (needed to make trial
 	//     divisor accurate)
@@ -119,14 +124,15 @@
 	if(qp != nil){
 		assert((quotient->flags & MPtimesafe) == 0);
 		mpnorm(quotient);
-		if(dividend->sign != divisor->sign)
-			quotient->sign = -1;
+		if(quotient->top != 0)
+			quotient->sign = qsign;
 	}
 
 	if(remainder != nil){
 		assert((remainder->flags & MPtimesafe) == 0);
 		mpright(u, s, remainder);	// u is the remainder shifted
-		remainder->sign = dividend->sign;
+		if(remainder->top != 0)
+			remainder->sign = rsign;
 	}
 
 	mpfree(t);
--- a/libmp/mplogic.c
+++ b/libmp/mplogic.c
@@ -36,7 +36,7 @@
 		b2 = t;
 		fl = fl >> 2 & 0x03 | fl << 2 & 0x0c | fl & 0x30;
 	}
-	mpbits(sum, b1->top*Dbits);
+	mpbits(sum, b1->top*Dbits+1);
 	dp1 = b1->p;
 	dp2 = b2->p;
 	dpo = sum->p;
@@ -60,6 +60,8 @@
 		dpo[i] = d;
 	}
 	sum->top = i;
+	if(co)
+		dpo[sum->top++] = co;
 	mpnorm(sum);
 }
 
@@ -105,7 +107,7 @@
 	}
 	fl = (b1->sign & 10) ^ (b2->sign & 12);
 	sum->sign = (int)(fl << 28) >> 31 | 1;
-	mpbits(sum, b1->top*Dbits);
+	mpbits(sum, b1->top*Dbits+1);
 	dp1 = b1->p;
 	dp2 = b2->p;
 	dpo = sum->p;
@@ -126,6 +128,8 @@
 		dpo[i] = d;
 	}
 	sum->top = i;
+	if(co)
+		dpo[sum->top++] = co;
 	mpnorm(sum);
 }