428 lines
14 KiB
C
428 lines
14 KiB
C
/* Copyright (C) 2007 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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In addition to the permissions in the GNU General Public License, the
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Free Software Foundation gives you unlimited permission to link the
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compiled version of this file into combinations with other programs,
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and to distribute those combinations without any restriction coming
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from the use of this file. (The General Public License restrictions
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do apply in other respects; for example, they cover modification of
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the file, and distribution when not linked into a combine
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executable.)
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA. */
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#undef IN_LIBGCC2
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#include "bid-dpd.h"
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/* get full 64x64bit product */
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#define __mul_64x64_to_128(P, CX, CY) \
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{ \
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UINT64 CXH, CXL, CYH,CYL,PL,PH,PM,PM2; \
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CXH = (CX) >> 32; \
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CXL = (UINT32)(CX); \
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CYH = (CY) >> 32; \
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CYL = (UINT32)(CY); \
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\
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PM = CXH*CYL; \
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PH = CXH*CYH; \
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PL = CXL*CYL; \
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PM2 = CXL*CYH; \
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PH += (PM>>32); \
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PM = (UINT64)((UINT32)PM)+PM2+(PL>>32); \
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\
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(P).w[1] = PH + (PM>>32); \
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(P).w[0] = (PM<<32)+(UINT32)PL; \
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}
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/* add 64-bit value to 128-bit */
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#define __add_128_64(R128, A128, B64) \
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{ \
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UINT64 R64H; \
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R64H = (A128).w[1]; \
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(R128).w[0] = (B64) + (A128).w[0]; \
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if((R128).w[0] < (B64)) R64H ++; \
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(R128).w[1] = R64H; \
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}
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/* add 128-bit value to 128-bit (assume no carry-out) */
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#define __add_128_128(R128, A128, B128) \
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{ \
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UINT128 Q128; \
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Q128.w[1] = (A128).w[1]+(B128).w[1]; \
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Q128.w[0] = (B128).w[0] + (A128).w[0]; \
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if(Q128.w[0] < (B128).w[0]) Q128.w[1] ++; \
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(R128).w[1] = Q128.w[1]; \
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(R128).w[0] = Q128.w[0]; \
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}
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#define __mul_128x128_high(Q, A, B) \
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{ \
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UINT128 ALBL, ALBH, AHBL, AHBH, QM, QM2; \
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\
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__mul_64x64_to_128(ALBH, (A).w[0], (B).w[1]); \
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__mul_64x64_to_128(AHBL, (B).w[0], (A).w[1]); \
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__mul_64x64_to_128(ALBL, (A).w[0], (B).w[0]); \
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__mul_64x64_to_128(AHBH, (A).w[1],(B).w[1]); \
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\
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__add_128_128(QM, ALBH, AHBL); \
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__add_128_64(QM2, QM, ALBL.w[1]); \
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__add_128_64((Q), AHBH, QM2.w[1]); \
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}
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#include "bid2dpd_dpd2bid.h"
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static const unsigned int dm103[] =
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{ 0, 1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000, 9000, 10000, 11000 };
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void _bid_to_dpd32 (_Decimal32 *, _Decimal32 *);
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void
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_bid_to_dpd32 (_Decimal32 *pres, _Decimal32 *px) {
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unsigned int sign, coefficient_x, exp, dcoeff;
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unsigned int b2, b1, b0, b01, res;
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_Decimal32 x = *px;
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sign = (x & 0x80000000);
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if ((x & 0x60000000ul) == 0x60000000ul) {
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/* special encodings */
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if ((x & 0x78000000ul) == 0x78000000ul) {
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*pres = x; /* NaN or Infinity */
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return;
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}
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/* coefficient */
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coefficient_x = (x & 0x001ffffful) | 0x00800000ul;
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if (coefficient_x >= 10000000) coefficient_x = 0;
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/* get exponent */
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exp = (x >> 21) & 0xff;
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} else {
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exp = (x >> 23) & 0xff;
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coefficient_x = (x & 0x007ffffful);
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}
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b01 = coefficient_x / 1000;
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b2 = coefficient_x - 1000 * b01;
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b0 = b01 / 1000;
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b1 = b01 - 1000 * b0;
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dcoeff = b2d[b2] | b2d2[b1];
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if (b0 >= 8) { /* is b0 8 or 9? */
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res = sign | ((0x600 | ((exp >> 6) << 7) |
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((b0 & 1) << 6) | (exp & 0x3f)) << 20) | dcoeff;
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} else { /* else b0 is 0..7 */
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res = sign | ((((exp >> 6) << 9) | (b0 << 6) |
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(exp & 0x3f)) << 20) | dcoeff;
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}
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*pres = res;
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}
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void _dpd_to_bid32 (_Decimal32 *, _Decimal32 *);
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void
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_dpd_to_bid32 (_Decimal32 *pres, _Decimal32 *px) {
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unsigned int r;
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unsigned int sign, exp, bcoeff;
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UINT64 trailing;
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unsigned int d0, d1, d2;
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_Decimal32 x = *px;
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sign = (x & 0x80000000);
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trailing = (x & 0x000fffff);
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if ((x & 0x78000000) == 0x78000000) {
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*pres = x;
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return;
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} else { /* normal number */
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if ((x & 0x60000000) == 0x60000000) { /* G0..G1 = 11 -> d0 = 8 + G4 */
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d0 = d2b3[((x >> 26) & 1) | 8]; /* d0 = (comb & 0x0100 ? 9 : 8); */
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exp = (x >> 27) & 3; /* exp leading bits are G2..G3 */
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} else {
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d0 = d2b3[(x >> 26) & 0x7];
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exp = (x >> 29) & 3; /* exp loading bits are G0..G1 */
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}
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d1 = d2b2[(trailing >> 10) & 0x3ff];
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d2 = d2b[(trailing) & 0x3ff];
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bcoeff = d2 + d1 + d0;
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exp = (exp << 6) + ((x >> 20) & 0x3f);
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if (bcoeff < (1 << 23)) {
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r = exp;
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r <<= 23;
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r |= (bcoeff | sign);
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} else {
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r = exp;
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r <<= 21;
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r |= (sign | 0x60000000ul);
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/* add coeff, without leading bits */
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r |= (((unsigned int) bcoeff) & 0x1fffff);
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}
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}
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*pres = r;
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}
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void _bid_to_dpd64 (_Decimal64 *, _Decimal64 *);
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void
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_bid_to_dpd64 (_Decimal64 *pres, _Decimal64 *px) {
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UINT64 res;
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UINT64 sign, comb, exp, B34, B01;
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UINT64 d103, D61;
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UINT64 b0, b2, b3, b5;
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unsigned int b1, b4;
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UINT64 bcoeff;
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UINT64 dcoeff;
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unsigned int yhi, ylo;
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_Decimal64 x = *px;
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sign = (x & 0x8000000000000000ull);
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comb = (x & 0x7ffc000000000000ull) >> 51;
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if ((comb & 0xf00) == 0xf00) {
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*pres = x;
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return;
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} else { /* Normal number */
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if ((comb & 0xc00) == 0xc00) { /* G0..G1 = 11 -> exp is G2..G11 */
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exp = (comb) & 0x3ff;
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bcoeff = (x & 0x0007ffffffffffffull) | 0x0020000000000000ull;
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} else {
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exp = (comb >> 2) & 0x3ff;
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bcoeff = (x & 0x001fffffffffffffull);
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}
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D61 = 2305843009ull; /* Floor(2^61 / 10^9) */
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/* Multiply the binary coefficient by ceil(2^64 / 1000), and take the upper
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64-bits in order to compute a division by 1000. */
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yhi = (D61 * (UINT64)(bcoeff >> (UINT64)27)) >> (UINT64)34;
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ylo = bcoeff - 1000000000ull * yhi;
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if (ylo >= 1000000000) {
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ylo = ylo - 1000000000;
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yhi = yhi + 1;
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}
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d103 = 0x4189374c;
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B34 = ((UINT64) ylo * d103) >> (32 + 8);
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B01 = ((UINT64) yhi * d103) >> (32 + 8);
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b5 = ylo - B34 * 1000;
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b2 = yhi - B01 * 1000;
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b3 = ((UINT64) B34 * d103) >> (32 + 8);
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b0 = ((UINT64) B01 * d103) >> (32 + 8);
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b4 = (unsigned int) B34 - (unsigned int) b3 *1000;
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b1 = (unsigned int) B01 - (unsigned int) dm103[b0];
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dcoeff = b2d[b5] | b2d2[b4] | b2d3[b3] | b2d4[b2] | b2d5[b1];
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if (b0 >= 8) /* is b0 8 or 9? */
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res = sign | ((0x1800 | ((exp >> 8) << 9) | ((b0 & 1) << 8) |
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(exp & 0xff)) << 50) | dcoeff;
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else /* else b0 is 0..7 */
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res = sign | ((((exp >> 8) << 11) | (b0 << 8) |
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(exp & 0xff)) << 50) | dcoeff;
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}
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*pres = res;
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}
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void _dpd_to_bid64 (_Decimal64 *, _Decimal64 *);
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void
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_dpd_to_bid64 (_Decimal64 *pres, _Decimal64 *px) {
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UINT64 res;
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UINT64 sign, comb, exp;
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UINT64 trailing;
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UINT64 d0, d1, d2;
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unsigned int d3, d4, d5;
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UINT64 bcoeff, mask;
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_Decimal64 x = *px;
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sign = (x & 0x8000000000000000ull);
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comb = (x & 0x7ffc000000000000ull) >> 50;
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trailing = (x & 0x0003ffffffffffffull);
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if ((comb & 0x1e00) == 0x1e00) {
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if ((comb & 0x1f00) == 0x1f00) { /* G0..G4 = 11111 -> NaN */
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if (comb & 0x0100) { /* G5 = 1 -> sNaN */
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*pres = x;
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} else { /* G5 = 0 -> qNaN */
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*pres = x;
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}
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} else { /*if ((comb & 0x1e00) == 0x1e00); G0..G4 = 11110 -> INF */
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*pres = x;
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}
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return;
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} else { /* normal number */
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if ((comb & 0x1800) == 0x1800) { /* G0..G1 = 11 -> d0 = 8 + G4 */
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d0 = d2b6[((comb >> 8) & 1) | 8]; /* d0 = (comb & 0x0100 ? 9 : 8); */
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exp = (comb & 0x600) >> 1; /* exp = (comb & 0x0400 ? 1 : 0) * 0x200 +
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(comb & 0x0200 ? 1 : 0) * 0x100; exp leading bits are G2..G3 */
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} else {
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d0 = d2b6[(comb >> 8) & 0x7];
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exp = (comb & 0x1800) >> 3; /* exp = (comb & 0x1000 ? 1 : 0) * 0x200 +
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(comb & 0x0800 ? 1 : 0) * 0x100; exp loading bits are G0..G1 */
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}
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d1 = d2b5[(trailing >> 40) & 0x3ff];
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d2 = d2b4[(trailing >> 30) & 0x3ff];
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d3 = d2b3[(trailing >> 20) & 0x3ff];
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d4 = d2b2[(trailing >> 10) & 0x3ff];
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d5 = d2b[(trailing) & 0x3ff];
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bcoeff = (d5 + d4 + d3) + d2 + d1 + d0;
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exp += (comb & 0xff);
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mask = 1;
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mask <<= 53;
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if (bcoeff < mask) { /* check whether coefficient fits in 10*5+3 bits */
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res = exp;
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res <<= 53;
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res |= (bcoeff | sign);
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*pres = res;
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return;
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}
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/* special format */
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res = (exp << 51) | (sign | 0x6000000000000000ull);
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/* add coeff, without leading bits */
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mask = (mask >> 2) - 1;
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bcoeff &= mask;
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res |= bcoeff;
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}
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*pres = res;
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}
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void _bid_to_dpd128 (_Decimal128 *, _Decimal128 *);
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void
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_bid_to_dpd128 (_Decimal128 *pres, _Decimal128 *px) {
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UINT128 res;
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UINT128 sign;
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unsigned int comb;
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UINT128 bcoeff;
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UINT128 dcoeff;
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UINT128 BH, d1018, BT2, BT1;
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UINT64 exp, BL, d109;
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UINT64 d106, d103;
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UINT64 k1, k2, k4, k5, k7, k8, k10, k11;
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unsigned int BHH32, BLL32, BHL32, BLH32, k0, k3, k6, k9, amount;
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_Decimal128 x = *px;
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sign.w[1] = (x.w[1] & 0x8000000000000000ull);
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sign.w[0] = 0;
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comb = (x.w[1] /*& 0x7fffc00000000000ull */ ) >> 46;
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exp = 0;
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if ((comb & 0x1e000) == 0x1e000) {
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if ((comb & 0x1f000) == 0x1f000) { /* G0..G4 = 11111 -> NaN */
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if (comb & 0x01000) { /* G5 = 1 -> sNaN */
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res = x;
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} else { /* G5 = 0 -> qNaN */
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res = x;
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}
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} else { /* G0..G4 = 11110 -> INF */
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res = x;
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}
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} else { /* normal number */
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exp = ((x.w[1] & 0x7fff000000000000ull) >> 49) & 0x3fff;
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bcoeff.w[1] = (x.w[1] & 0x0001ffffffffffffull);
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bcoeff.w[0] = x.w[0];
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d1018 = reciprocals10_128[18];
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__mul_128x128_high (BH, bcoeff, d1018);
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amount = recip_scale[18];
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BH.w[0] = (BH.w[0] >> amount) | (BH.w[1] << (64 - amount));
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BL = bcoeff.w[0] - BH.w[0] * 1000000000000000000ull;
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d109 = reciprocals10_64[9];
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__mul_64x64_to_128 (BT1, BH.w[0], d109);
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BHH32 = (unsigned int) (BT1.w[1] >> short_recip_scale[9]);
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BHL32 = (unsigned int) BH.w[0] - BHH32 * 1000000000;
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__mul_64x64_to_128 (BT2, BL, d109);
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BLH32 = (unsigned int) (BT2.w[1] >> short_recip_scale[9]);
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BLL32 = (unsigned int) BL - BLH32 * 1000000000;
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d106 = 0x431BDE83;
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d103 = 0x4189374c;
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k0 = ((UINT64) BHH32 * d106) >> (32 + 18);
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BHH32 -= (unsigned int) k0 *1000000;
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k1 = ((UINT64) BHH32 * d103) >> (32 + 8);
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k2 = BHH32 - (unsigned int) k1 *1000;
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k3 = ((UINT64) BHL32 * d106) >> (32 + 18);
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BHL32 -= (unsigned int) k3 *1000000;
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k4 = ((UINT64) BHL32 * d103) >> (32 + 8);
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k5 = BHL32 - (unsigned int) k4 *1000;
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k6 = ((UINT64) BLH32 * d106) >> (32 + 18);
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BLH32 -= (unsigned int) k6 *1000000;
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k7 = ((UINT64) BLH32 * d103) >> (32 + 8);
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k8 = BLH32 - (unsigned int) k7 *1000;
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k9 = ((UINT64) BLL32 * d106) >> (32 + 18);
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BLL32 -= (unsigned int) k9 *1000000;
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k10 = ((UINT64) BLL32 * d103) >> (32 + 8);
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k11 = BLL32 - (unsigned int) k10 *1000;
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dcoeff.w[1] = (b2d[k5] >> 4) | (b2d[k4] << 6) | (b2d[k3] << 16) |
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(b2d[k2] << 26) | (b2d[k1] << 36);
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dcoeff.w[0] = b2d[k11] | (b2d[k10] << 10) | (b2d[k9] << 20) |
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(b2d[k8] << 30) | (b2d[k7] << 40) | (b2d[k6] << 50) | (b2d[k5] << 60);
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res.w[0] = dcoeff.w[0];
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if (k0 >= 8) {
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res.w[1] = sign.w[1] | ((0x18000 | ((exp >> 12) << 13) |
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((k0 & 1) << 12) | (exp & 0xfff)) << 46) | dcoeff.w[1];
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} else {
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res.w[1] = sign.w[1] | ((((exp >> 12) << 15) | (k0 << 12) |
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(exp & 0xfff)) << 46) | dcoeff.w[1];
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}
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}
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*pres = res;
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}
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void _dpd_to_bid128 (_Decimal128 *, _Decimal128 *);
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void
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_dpd_to_bid128 (_Decimal128 *pres, _Decimal128 *px) {
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UINT128 res;
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UINT128 sign;
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UINT64 exp, comb;
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UINT128 trailing;
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UINT64 d0, d1, d2, d3, d4, d5, d6, d7, d8, d9, d10, d11;
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UINT128 bcoeff;
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UINT64 tl, th;
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_Decimal128 x = *px;
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sign.w[1] = (x.w[1] & 0x8000000000000000ull);
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sign.w[0] = 0;
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comb = (x.w[1] & 0x7fffc00000000000ull) >> 46;
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trailing.w[1] = x.w[1];
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trailing.w[0] = x.w[0];
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if ((comb & 0x1e000) == 0x1e000) {
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if ((comb & 0x1f000) == 0x1f000) { /* G0..G4 = 11111 -> NaN */
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if (comb & 0x01000) { /* G5 = 1 -> sNaN */
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*pres = x;
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} else { /* G5 = 0 -> qNaN */
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*pres = x;
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}
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} else { /* G0..G4 = 11110 -> INF */
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*pres = x;
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}
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return;
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} else { /* Normal number */
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if ((comb & 0x18000) == 0x18000) { /* G0..G1 = 11 -> d0 = 8 + G4 */
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d0 = d2b6[8 + ((comb & 0x01000) >> 12)];
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exp = (comb & 0x06000) >> 1; /* exp leading bits are G2..G3 */
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} else {
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d0 = d2b6[((comb & 0x07000) >> 12)];
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exp = (comb & 0x18000) >> 3; /* exp loading bits are G0..G1 */
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}
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d11 = d2b[(trailing.w[0]) & 0x3ff];
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d10 = d2b2[(trailing.w[0] >> 10) & 0x3ff];
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d9 = d2b3[(trailing.w[0] >> 20) & 0x3ff];
|
|
d8 = d2b4[(trailing.w[0] >> 30) & 0x3ff];
|
|
d7 = d2b5[(trailing.w[0] >> 40) & 0x3ff];
|
|
d6 = d2b6[(trailing.w[0] >> 50) & 0x3ff];
|
|
d5 = d2b[(trailing.w[0] >> 60) | ((trailing.w[1] & 0x3f) << 4)];
|
|
d4 = d2b2[(trailing.w[1] >> 6) & 0x3ff];
|
|
d3 = d2b3[(trailing.w[1] >> 16) & 0x3ff];
|
|
d2 = d2b4[(trailing.w[1] >> 26) & 0x3ff];
|
|
d1 = d2b5[(trailing.w[1] >> 36) & 0x3ff];
|
|
tl = d11 + d10 + d9 + d8 + d7 + d6;
|
|
th = d5 + d4 + d3 + d2 + d1 + d0;
|
|
__mul_64x64_to_128 (bcoeff, th, 1000000000000000000ull);
|
|
__add_128_64 (bcoeff, bcoeff, tl);
|
|
exp += (comb & 0xfff);
|
|
res.w[0] = bcoeff.w[0];
|
|
res.w[1] = (exp << 49) | sign.w[1] | bcoeff.w[1];
|
|
}
|
|
*pres = res;
|
|
}
|