From: ceriel <none@none>
Date: Thu, 11 Aug 1988 14:50:18 +0000 (+0000)
Subject: speeded up again :-)
X-Git-Tag: release-5-5~2929
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=5aa128ea62efdd6e9ede5d508430a73f9d8333e7;p=ack.git

speeded up again :-)
---

diff --git a/mach/proto/fp/FP.script b/mach/proto/fp/FP.script
index 38213b181..a9fa23645 100644
--- a/mach/proto/fp/FP.script
+++ b/mach/proto/fp/FP.script
@@ -34,7 +34,6 @@ g/_sub_ext/s//.sub_ext/g
 g/_zrf_ext/s//.zrf_ext/g
 g/_compact/s//.compact/g
 g/_extend/s//.extend/g
-g/_b32_add/s//.b32_add/g
 g/_b64_add/s//.b64_add/g
 g/_b64_sft/s//.b64_sft/g
 g/_b64_rsft/s//.b64_rsft/g
diff --git a/mach/proto/fp/adder.c b/mach/proto/fp/adder.c
index af5396546..2a9afbfb2 100644
--- a/mach/proto/fp/adder.c
+++ b/mach/proto/fp/adder.c
@@ -32,10 +32,12 @@ register	B64	*e1,*e2;
 				int	carry;
 
 			/* add higher pair of 32 bits */
-	overflow = b32_add(&e1->h_32,&e2->h_32);
+	overflow = ((unsigned long) 0xFFFFFFFF - e1->h_32 < e2->h_32);
+	e1->h_32 += e2->h_32;
 
 			/* add lower pair of 32 bits */
-	carry =	   b32_add(&e1->l_32,&e2->l_32);
+	carry = ((unsigned long) 0xFFFFFFFF - e1->l_32 < e2->l_32);
+	e1->l_32 += e2->l_32;
 # ifdef	EXT_DEBUG
 	printf("\t\t\t\t\tb64_add: overflow (%d); internal carry(%d)\n",
 					overflow,carry);
@@ -46,17 +48,3 @@ register	B64	*e1,*e2;
 	else
 		return(overflow);	/* return status from higher add */
 }
-
-	/*
-	 *	add 32 bits (unsigned longs)
-	 *	and return the carry status
-	 */
-
-b32_add(e1,e2)
-register	unsigned long	*e1,*e2;
-{
-	int	carry = ((unsigned long) 0xFFFFFFFF - *e1 < *e2);
-
-	*e1 += *e2;
-	return carry;
-}
diff --git a/mach/proto/fp/compact.c b/mach/proto/fp/compact.c
index 186d41cfa..ffc42f29e 100644
--- a/mach/proto/fp/compact.c
+++ b/mach/proto/fp/compact.c
@@ -1,4 +1,4 @@
-e
+/*
   (c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
   See the copyright notice in the ACK home directory, in the file "Copyright".
 */
diff --git a/mach/proto/fp/div_ext.c b/mach/proto/fp/div_ext.c
index db38b833b..c58be1781 100644
--- a/mach/proto/fp/div_ext.c
+++ b/mach/proto/fp/div_ext.c
@@ -38,6 +38,7 @@ EXTEND	*e1,*e2;
 			unsigned short u[9], v[5];
 			register int j;
 			register unsigned short *u_p = u;
+			int maxv = 4;
 #endif
 
 	if ((e2->m1 | e2->m2) == 0) {
@@ -169,6 +170,7 @@ EXTEND	*e1,*e2;
 	v[2] = e2->m1;
 	v[3] = e2->m2 >> 16;
 	v[4] = e2->m2;
+	while (! v[maxv]) maxv--;
 	result[0] = 0;
 	result[1] = 0;
 	lp = result;
@@ -204,7 +206,7 @@ EXTEND	*e1,*e2;
 			unsigned long k = 0;
 			int borrow = 0;
 
-			for (i = 4; i > 0; i--) {
+			for (i = maxv; i > 0; i--) {
 				unsigned long tmp = q_est * v[i] + k + borrow;
 				unsigned short md = tmp;
 
@@ -222,7 +224,7 @@ EXTEND	*e1,*e2;
 				*/
 				*lp |= (j & 1) ? (q_est - 1) : ((q_est-1)<<16);
 				borrow = 0;
-				for (i = 4; i > 0; i--) {
+				for (i = maxv; i > 0; i--) {
 					unsigned long tmp 
 					    = v[i]+(unsigned long)u_p[i]+borrow;
 					
diff --git a/mach/proto/fp/mul_ext.c b/mach/proto/fp/mul_ext.c
index a04a9b379..3d30ffcd1 100644
--- a/mach/proto/fp/mul_ext.c
+++ b/mach/proto/fp/mul_ext.c
@@ -17,12 +17,12 @@
 mul_ext(e1,e2)
 EXTEND	*e1,*e2;
 {
-	register int	k,i,j;		/* loop control	*/
-	long  unsigned	*reg[7];
-	long  unsigned	tmp[4];
+	register int	i,j;		/* loop control	*/
 	short unsigned	mp[4];	/* multiplier */
 	short unsigned	mc[4];	/* multipcand */
-	B64	low64,tmp64;	/* 64 bit storage	*/
+	short unsigned	result[8];	/* result */
+	B64		tmp64;
+	register unsigned short *pres;
 
 	/* first save the sign (XOR)			*/
 
@@ -88,48 +88,33 @@ infinity:	e1->m1 = e1->m2 =0L;
 	mc[1] = (unsigned short) e2->m1;
 	mc[2] = e2->m2 >> 16;
 	mc[3] = (unsigned short) e2->m2;
-	/*
-	 *	assign pointers
-	 */
-	reg[0] = &e1->m1;	/* the answer goes here */
-	reg[1] = &tmp[1];
-	reg[2] = &e1->m2;	/* and here	*/
-	reg[3] = &tmp[2];
-	reg[4] = &low64.h_32;
-	reg[5] = &tmp[3];
-	reg[6] = &low64.l_32;
-
-	/*
-	 *	zero registers
-	 */
-	for(i=7;i--;)
-		*reg[i] = 0;
-
+	for (i = 8; i--;) {
+		result[i] = 0;
+	}
 	/*
 	 *	fill registers with their components
 	 */
-	for(i=4;i--;) if (mp[i])
-		for(j=4;j--;) if (mc[j]) {
-			k = i+j;
-			tmp[0] = (long)mp[i] * (long)mc[j];
-			if (b32_add(reg[k],tmp))	{
-				for(tmp[0] = 0x10000L;k>0;)
-					if (b32_add(reg[--k],tmp) == 0)
-						break;
-			}
+	for(i=4, pres = &result[4];i--;pres--) if (mp[i]) {
+		unsigned short k = 0;
+		unsigned long mpi = mp[i];
+		for(j=4;j--;) {
+			unsigned long tmp = (unsigned long)pres[j] + k;
+			if (mc[j]) tmp += mpi * mc[j];
+			pres[j] = tmp;
+			k = tmp >> 16;
 		}
+		pres[-1] = k;
+	}
 	
 	/*
 	 *	combine the registers to a total
 	 */
-	tmp64.h_32 = (*reg[1]>>16);
-	tmp64.l_32 = (*reg[1]<<16) + (*reg[3]>>16);
-	b64_add((B64 *)&e1->m1,&tmp64);
-	tmp64.l_32 = *reg[5]<<16;
-	tmp64.h_32 = (*reg[5]>>16) + (*reg[3]<<16);
-	if (b64_add(&low64,&tmp64))
+	e1->m1 = ((unsigned long)(result[0]) << 16) + result[1];
+	e1->m2 = ((unsigned long)(result[2]) << 16) + result[3];
+	if (result[4] & 0x8000) {
 		if (++e1->m2 == 0)
 			e1->m1++;
+	}
 
 	nrm_ext(e1);
 }