603 lines
12 KiB
Text
603 lines
12 KiB
Text
/*
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(c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
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See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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/* $Header$ */
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/* #define NOFLOAT for machines without floating point
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#define ACKFLOAT for machines using the ACK floating point software
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#define IEEEFLOAT for machines using IEEE floating point format
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#define OWNFLOAT to use floating point format of machine on which
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the code generator runs
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If none of these are defined, PDP-11 format is generated.
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*/
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#ifndef NOFLOAT
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#ifndef OWNFLOAT
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#include <ctype.h>
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struct mantissa {
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unsigned long h_32;
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unsigned long l_32;
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};
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struct EXTEND {
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short sign;
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short exp;
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struct mantissa mantissa;
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#define m1 mantissa.h_32
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#define m2 mantissa.l_32
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};
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static int b64_add();
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static int b64_sft();
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static
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mul_ext(e1,e2,e3)
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struct EXTEND *e1,*e2,*e3;
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{
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/* Multiply the extended numbers e1 and e2, and put the
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result in e3.
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*/
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register int i,j; /* loop control */
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unsigned short mp[4];
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unsigned short mc[4];
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unsigned short result[8]; /* result */
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register unsigned short *pres;
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/* first save the sign (XOR) */
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e3->sign = e1->sign ^ e2->sign;
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/* compute new exponent */
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e3->exp = e1->exp + e2->exp + 1;
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/* check for overflow/underflow ??? */
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/* 128 bit multiply of mantissas */
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/* assign unknown long formats */
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/* to known unsigned word formats */
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mp[0] = e1->m1 >> 16;
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mp[1] = (unsigned short) e1->m1;
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mp[2] = e1->m2 >> 16;
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mp[3] = (unsigned short) e1->m2;
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mc[0] = e2->m1 >> 16;
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mc[1] = (unsigned short) e2->m1;
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mc[2] = e2->m2 >> 16;
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mc[3] = (unsigned short) e2->m2;
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for (i = 8; i--;) {
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result[i] = 0;
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}
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/*
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* fill registers with their components
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*/
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for(i=4, pres = &result[4];i--;pres--) if (mp[i]) {
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unsigned short k = 0;
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unsigned long mpi = mp[i];
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for(j=4;j--;) {
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unsigned long tmp = (unsigned long)pres[j] + k;
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if (mc[j]) tmp += mpi * mc[j];
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pres[j] = tmp;
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k = tmp >> 16;
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}
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pres[-1] = k;
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}
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if (! (result[0] & 0x8000)) {
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e3->exp--;
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for (i = 0; i <= 3; i++) {
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result[i] <<= 1;
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if (result[i+1]&0x8000) result[i] |= 1;
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}
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result[4] <<= 1;
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}
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/*
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* combine the registers to a total
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*/
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e3->m1 = ((unsigned long)(result[0]) << 16) + result[1];
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e3->m2 = ((unsigned long)(result[2]) << 16) + result[3];
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if (result[4] & 0x8000) {
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if (++e3->m2 == 0) {
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if (++e3->m1 == 0) {
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e3->m1 = 0x80000000;
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e3->exp++;
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}
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}
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}
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}
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static
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b64_sft(e1,n)
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struct mantissa *e1;
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int n;
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{
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if (n > 0) {
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if (n > 63) {
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e1->l_32 = 0;
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e1->h_32 = 0;
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return;
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}
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if (n >= 32) {
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e1->l_32 = e1->h_32;
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e1->h_32 = 0;
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n -= 32;
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}
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if (n > 0) {
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e1->l_32 >>= n;
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if (e1->h_32 != 0) {
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e1->l_32 |= (e1->h_32 << (32 - n));
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e1->h_32 >>= n;
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}
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}
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return;
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}
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n = -n;
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if (n > 0) {
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if (n > 63) {
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e1->l_32 = 0;
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e1->h_32 = 0;
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return;
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}
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if (n >= 32) {
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e1->h_32 = e1->l_32;
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e1->l_32 = 0;
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n -= 32;
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}
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if (n > 0) {
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e1->h_32 <<= n;
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if (e1->l_32 != 0) {
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e1->h_32 |= (e1->l_32 >> (32 - n));
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e1->l_32 <<= n;
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}
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}
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}
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}
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static int
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b64_add(e1,e2)
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/*
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* pointers to 64 bit 'registers'
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*/
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struct mantissa *e1,*e2;
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{
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register int overflow;
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int carry;
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/* add higher pair of 32 bits */
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overflow = ((unsigned long) 0xFFFFFFFF - e1->h_32 < e2->h_32);
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e1->h_32 += e2->h_32;
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/* add lower pair of 32 bits */
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carry = ((unsigned long) 0xFFFFFFFF - e1->l_32 < e2->l_32);
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e1->l_32 += e2->l_32;
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if ((carry) && (++e1->h_32 == 0))
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return(1); /* had a 64 bit overflow */
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else
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return(overflow); /* return status from higher add */
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}
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/* The following tables can be computed with the following bc(1)
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program:
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obase=16
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scale=0
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define t(x){
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auto a, b, c
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a=2;b=1;c=2^32;n=1
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while(a<x) {
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b=a;n+=n;a*=a
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}
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n/=2
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a=b
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while(b<x) {
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a=b;b*=c;n+=32
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}
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n-=32
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b=a
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while(a<x) {
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b=a;a+=a;n+=1
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}
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n-=1
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x*=16^16
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b=x%a
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x/=a
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if(a<=(2*b)) x+=1
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obase=10
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n
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obase=16
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return(x)
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}
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for (i=1;i<28;i++) {
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t(10^i)
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}
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0
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for (i=1;i<20;i++) {
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t(10^(28*i))
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}
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0
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define r(x){
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auto a, b, c
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a=2;b=1;c=2^32;n=1
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while(a<x) {
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b=a;n+=n;a*=a
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}
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n/=2
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a=b
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while(b<x) {
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a=b;b*=c;n+=32
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}
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n-=32
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b=a
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while(a<x) {
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b=a;a+=a;n+=1
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}
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a=b
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a*=16^16
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b=a%x
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a/=x
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if(x<=(2*b)) a+=1
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obase=10
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-n
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obase=16
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return(a)
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}
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for (i=1;i<28;i++) {
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r(10^i)
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}
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0
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for (i=1;i<20;i++) {
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r(10^(28*i))
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}
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0
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*/
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static struct EXTEND ten_powers[] = { /* representation of 10 ** i */
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{ 0, 0, 0x80000000, 0 },
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{ 0, 3, 0xA0000000, 0 },
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{ 0, 6, 0xC8000000, 0 },
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{ 0, 9, 0xFA000000, 0 },
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{ 0, 13, 0x9C400000, 0 },
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{ 0, 16, 0xC3500000, 0 },
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{ 0, 19, 0xF4240000, 0 },
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{ 0, 23, 0x98968000, 0 },
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{ 0, 26, 0xBEBC2000, 0 },
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{ 0, 29, 0xEE6B2800, 0 },
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{ 0, 33, 0x9502F900, 0 },
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{ 0, 36, 0xBA43B740, 0 },
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{ 0, 39, 0xE8D4A510, 0 },
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{ 0, 43, 0x9184E72A, 0 },
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{ 0, 46, 0xB5E620F4, 0x80000000 },
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{ 0, 49, 0xE35FA931, 0xA0000000 },
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{ 0, 53, 0x8E1BC9BF, 0x04000000 },
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{ 0, 56, 0xB1A2BC2E, 0xC5000000 },
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{ 0, 59, 0xDE0B6B3A, 0x76400000 },
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{ 0, 63, 0x8AC72304, 0x89E80000 },
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{ 0, 66, 0xAD78EBC5, 0xAC620000 },
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{ 0, 69, 0xD8D726B7, 0x177A8000 },
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{ 0, 73, 0x87867832, 0x6EAC9000 },
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{ 0, 76, 0xA968163F, 0x0A57B400 },
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{ 0, 79, 0xD3C21BCE, 0xCCEDA100 },
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{ 0, 83, 0x84595161, 0x401484A0 },
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{ 0, 86, 0xA56FA5B9, 0x9019A5C8 },
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{ 0, 89, 0xCECB8F27, 0xF4200F3A }
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};
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static struct EXTEND big_ten_powers[] = { /* representation of 10 ** (28*i) */
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{ 0, 0, 0x80000000, 0 },
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{ 0, 93, 0x813F3978, 0xF8940984 },
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{ 0, 186, 0x82818F12, 0x81ED44A0 },
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{ 0, 279, 0x83C7088E, 0x1AAB65DB },
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{ 0, 372, 0x850FADC0, 0x9923329E },
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{ 0, 465, 0x865B8692, 0x5B9BC5C2 },
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{ 0, 558, 0x87AA9AFF, 0x79042287 },
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{ 0, 651, 0x88FCF317, 0xF22241E2 },
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{ 0, 744, 0x8A5296FF, 0xE33CC930 },
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{ 0, 837, 0x8BAB8EEF, 0xB6409C1A },
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{ 0, 930, 0x8D07E334, 0x55637EB3 },
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{ 0, 1023, 0x8E679C2F, 0x5E44FF8F },
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{ 0, 1116, 0x8FCAC257, 0x558EE4E6 },
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{ 0, 1209, 0x91315E37, 0xDB165AA9 },
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{ 0, 1302, 0x929B7871, 0xDE7F22B9 },
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{ 0, 1395, 0x940919BB, 0xD4620B6D },
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{ 0, 1488, 0x957A4AE1, 0xEBF7F3D4 },
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{ 0, 1581, 0x96EF14C6, 0x454AA840 },
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{ 0, 1674, 0x98678061, 0x27ECE4F5 },
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{ 0, 1767, 0x99E396C1, 0x3A3ACFF2 }
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};
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static struct EXTEND r_ten_powers[] = { /* representation of 10 ** -i */
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{ 0, 0, 0x80000000, 0 },
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{ 0, -4, 0xCCCCCCCC, 0xCCCCCCCD },
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{ 0, -7, 0xA3D70A3D, 0x70A3D70A },
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{ 0, -10, 0x83126E97, 0x8D4FDF3B },
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{ 0, -14, 0xD1B71758, 0xE219652C },
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{ 0, -17, 0xA7C5AC47, 0x1B478423 },
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{ 0, -20, 0x8637BD05, 0xAF6C69B6 },
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{ 0, -24, 0xD6BF94D5, 0xE57A42BC },
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{ 0, -27, 0xABCC7711, 0x8461CEFD },
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{ 0, -30, 0x89705F41, 0x36B4A597 },
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{ 0, -34, 0xDBE6FECE, 0xBDEDD5BF },
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{ 0, -37, 0xAFEBFF0B, 0xCB24AAFF },
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{ 0, -40, 0x8CBCCC09, 0x6F5088CC },
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{ 0, -44, 0xE12E1342, 0x4BB40E13 },
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{ 0, -47, 0xB424DC35, 0x095CD80F },
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{ 0, -50, 0x901D7CF7, 0x3AB0ACD9 },
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{ 0, -54, 0xE69594BE, 0xC44DE15B },
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{ 0, -57, 0xB877AA32, 0x36A4B449 },
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{ 0, -60, 0x9392EE8E, 0x921D5D07 },
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{ 0, -64, 0xEC1E4A7D, 0xB69561A5 },
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{ 0, -67, 0xBCE50864, 0x92111AEB },
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{ 0, -70, 0x971DA050, 0x74DA7BEF },
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{ 0, -74, 0xF1C90080, 0xBAF72CB1 },
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{ 0, -77, 0xC16D9A00, 0x95928A27 },
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{ 0, -80, 0x9ABE14CD, 0x44753B53 },
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{ 0, -84, 0xF79687AE, 0xD3EEC551 },
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{ 0, -87, 0xC6120625, 0x76589DDB },
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{ 0, -90, 0x9E74D1B7, 0x91E07E48 }
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};
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static struct EXTEND r_big_ten_powers[] = { /* representation of 10 ** -(28*i) */
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{ 0, 0, 0x80000000, 0 },
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{ 0, -94, 0xFD87B5F2, 0x8300CA0E },
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{ 0, -187, 0xFB158592, 0xBE068D2F },
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{ 0, -280, 0xF8A95FCF, 0x88747D94 },
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{ 0, -373, 0xF64335BC, 0xF065D37D },
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{ 0, -466, 0xF3E2F893, 0xDEC3F126 },
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{ 0, -559, 0xF18899B1, 0xBC3F8CA2 },
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{ 0, -652, 0xEF340A98, 0x172AACE5 },
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{ 0, -745, 0xECE53CEC, 0x4A314EBE },
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{ 0, -838, 0xEA9C2277, 0x23EE8BCB },
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{ 0, -931, 0xE858AD24, 0x8F5C22CA },
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{ 0, -1024, 0xE61ACF03, 0x3D1A45DF },
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{ 0, -1117, 0xE3E27A44, 0x4D8D98B8 },
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{ 0, -1210, 0xE1AFA13A, 0xFBD14D6E },
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{ 0, -1303, 0xDF82365C, 0x497B5454 },
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{ 0, -1396, 0xDD5A2C3E, 0xAB3097CC },
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{ 0, -1489, 0xDB377599, 0xB6074245 },
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{ 0, -1582, 0xD91A0545, 0xCDB51186 },
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{ 0, -1675, 0xD701CE3B, 0xD387BF48 },
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{ 0, -1768, 0xD4EEC394, 0xD6258BF8 }
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};
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static
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add_exponent(e, exp)
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struct EXTEND *e;
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{
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int neg = exp < 0;
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int divsz, modsz;
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struct EXTEND x;
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if (neg) exp = -exp;
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divsz = exp / (sizeof(ten_powers)/sizeof(ten_powers[0]));
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modsz = exp % (sizeof(ten_powers)/sizeof(ten_powers[0]));
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if (neg) {
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mul_ext(e, &r_ten_powers[modsz], &x);
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mul_ext(&x, &r_big_ten_powers[divsz], e);
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}
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else {
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mul_ext(e, &ten_powers[modsz], &x);
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mul_ext(&x, &big_ten_powers[divsz], e);
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}
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}
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_str_ext_cvt(s, ss, e)
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char *s, **ss;
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struct EXTEND *e;
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{
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/* Like strtod, but for extended precision */
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register int c;
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int dotseen = 0;
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int digitseen = 0;
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int exp = 0;
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if (ss) *ss = s;
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while (isspace(*s)) s++;
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e->sign = 0;
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e->exp = 0;
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e->m1 = e->m2 = 0;
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c = *s;
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switch(c) {
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case '-':
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e->sign = 1;
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case '+':
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s++;
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}
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while (c = *s++, isdigit(c) || (c == '.' && ! dotseen++)) {
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if (c == '.') continue;
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digitseen = 1;
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if (e->m1 <= (unsigned long)(0xFFFFFFFF)/10) {
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struct mantissa a1;
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a1 = e->mantissa;
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b64_sft(&(e->mantissa), -3);
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b64_sft(&a1, -1);
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b64_add(&(e->mantissa), &a1);
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a1.h_32 = 0;
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a1.l_32 = c - '0';
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b64_add(&(e->mantissa), &a1);
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}
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else exp++;
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if (dotseen) exp--;
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}
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if (! digitseen) return;
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if (ss) *ss = s - 1;
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if (c == 'E' || c == 'e') {
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int exp1 = 0;
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int sign = 1;
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switch(*s) {
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case '-':
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sign = -1;
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case '+':
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s++;
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}
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if (c = *s, isdigit(c)) {
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do {
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exp1 = 10 * exp1 + (c - '0');
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} while (c = *++s, isdigit(c));
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if (ss) *ss = s;
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}
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exp += sign * exp1;
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}
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if (e->m1 == 0 && e->m2 == 0) return;
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e->exp = 63;
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while (! (e->m1 & 0x80000000)) {
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b64_sft(&(e->mantissa),-1);
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e->exp--;
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}
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add_exponent(e, exp);
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}
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#endif
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#endif
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#ifdef NOFLOAT
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con_float() {
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static int been_here;
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if (argval != 4 && argval != 8)
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fatal("bad fcon size");
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fputs(".data4\t", codefile);
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if (argval == 8)
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fputs("0,", codefile);
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fputs("0 !dummy float\n", codefile);
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if ( !been_here++) {
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fputs("Warning : dummy float-constant(s)\n", stderr);
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}
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}
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#else
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#define ACKFLOAT 1
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con_float() {
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int i, j;
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char *p;
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#ifdef OWNFLOAT
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float fl;
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double f;
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double atof();
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#else
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int overflow = 0;
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struct EXTEND e;
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char buf[8];
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#endif
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if (argval!= 4 && argval!= 8) {
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fprintf(stderr,"float constant size = %d\n",argval);
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fatal("bad fcon size");
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}
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fprintf(codefile,"!float %s sz %d\n", str, argval);
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#ifdef OWNFLOAT
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f = atof(str);
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if (argval == 4) {
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fl = f;
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p = (char *) &fl;
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}
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else {
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p = (char *) &f;
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}
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fprintf(codefile, ".data1 0%o", *p++ & 0377);
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for (i = argval-1; i; i--) {
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fprintf(codefile,",0%o", *p++ & 0377);
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}
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#else
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_str_ext_cvt(str, (char **) 0, &e);
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#if IEEEFLOAT+ACKFLOAT
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if (argval == 4) {
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#endif
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e.exp += 127;
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#ifndef IEEEFLOAT
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e.exp += 2;
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#endif
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if (e.m1 == 0) e.exp = 0;
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#if IEEEFLOAT+ACKFLOAT
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if (e.exp >= 255) {
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overflow = 1;
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e.exp = 255;
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e.m1 = e.m2 = 0;
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}
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if (e.exp <= 0) {
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#if IEEEFLOAT
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b64_sft(&(e.mantissa), 1);
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if (e.exp < 0) {
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b64_sft(&(e.mantissa), -e.exp);
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e.exp = 0;
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}
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#else
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e.exp = 0;
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e.m1 = e.m2 = 0;
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#endif
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}
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#endif
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buf[0] = (e.sign << 7) | (e.exp >> 1);
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buf[1] = ((e.exp&1) << 7) | ((e.m1 & 0x7fffffff) >> 24);
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buf[2] = e.m1 >> 16;
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buf[3] = e.m1 >> 8;
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if (argval == 8) {
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buf[4] = e.m1;
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buf[5] = e.m2 >> 24;
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buf[6] = e.m2 >> 16;
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buf[7] = e.m2 >> 8;
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b64_sft(&(e.mantissa), -56);
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}
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else b64_sft(&(e.mantissa), -24);
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#if IEEEFLOAT+ACKFLOAT
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}
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else {
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e.exp += 1023;
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#ifndef IEEEFLOAT
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e.exp += 2;
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#endif
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if (e.m1 == 0) e.exp = 0;
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if (e.exp >= 2047) {
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overflow = 1;
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e.exp = 2047;
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e.m1 = e.m2 = 0;
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}
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if (e.exp <= 0) {
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#if IEEEFLOAT
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b64_sft(&(e.mantissa), 1);
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if (e.exp < 0) {
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b64_sft(&(e.mantissa), -e.exp);
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e.exp = 0;
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}
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#else
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e.exp = 0;
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e.m1 = e.m2 = 0;
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#endif
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}
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buf[0] = (e.sign << 7) | (e.exp >> 4);
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buf[1] = ((e.exp & 017)<< 4) | ((e.m1&0x7fffffff) >> 27);
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buf[2] = e.m1 >> 19;
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buf[3] = e.m1 >> 11;
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buf[4] = e.m1 >> 3;
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buf[5] = (e.m1 << 5) | (e.m2 >> 27);
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buf[6] = e.m2 >> 19;
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buf[7] = e.m2 >> 11;
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b64_sft(&(e.mantissa), -53);
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}
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#endif
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if (! overflow && (e.m1 & 0x80000000)) for (i = argval-1; i>=0; i--) {
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if ((buf[i] &0377) != 0377) {
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buf[i]++;
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break;
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}
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else buf[i] = 0;
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}
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if (overflow || i < 0) {
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fprintf(stderr, "Warning: overflow in floating point constant %s\n", str);
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}
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for (i = 0; i < argval; i++) {
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fprintf(codefile,
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i != 0 ? ",0%o" : ".data1 0%o",
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buf[i]&0377);
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}
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#endif
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putc('\n', codefile);
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}
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#endif
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