266 lines
6.5 KiB
C
266 lines
6.5 KiB
C
/*
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* Helpers for integer and multimedia instructions.
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*
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* Copyright (c) 2007 Jocelyn Mayer
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "cpu.h"
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#include "exec/exec-all.h"
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#include "exec/helper-proto.h"
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#include "qemu/host-utils.h"
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uint64_t helper_zapnot(uint64_t val, uint64_t mskb)
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{
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uint64_t mask;
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mask = -(mskb & 0x01) & 0x00000000000000ffull;
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mask |= -(mskb & 0x02) & 0x000000000000ff00ull;
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mask |= -(mskb & 0x04) & 0x0000000000ff0000ull;
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mask |= -(mskb & 0x08) & 0x00000000ff000000ull;
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mask |= -(mskb & 0x10) & 0x000000ff00000000ull;
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mask |= -(mskb & 0x20) & 0x0000ff0000000000ull;
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mask |= -(mskb & 0x40) & 0x00ff000000000000ull;
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mask |= -(mskb & 0x80) & 0xff00000000000000ull;
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return val & mask;
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}
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uint64_t helper_zap(uint64_t val, uint64_t mask)
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{
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return helper_zapnot(val, ~mask);
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}
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uint64_t helper_cmpbe0(uint64_t a)
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{
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uint64_t m = 0x7f7f7f7f7f7f7f7fULL;
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uint64_t c = ~(((a & m) + m) | a | m);
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/* a.......b.......c.......d.......e.......f.......g.......h....... */
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c |= c << 7;
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/* ab......bc......cd......de......ef......fg......gh......h....... */
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c |= c << 14;
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/* abcd....bcde....cdef....defg....efgh....fgh.....gh......h....... */
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c |= c << 28;
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/* abcdefghbcdefgh.cdefgh..defgh...efgh....fgh.....gh......h....... */
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return c >> 56;
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}
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uint64_t helper_cmpbge(uint64_t a, uint64_t b)
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{
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uint64_t mask = 0x00ff00ff00ff00ffULL;
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uint64_t test = 0x0100010001000100ULL;
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uint64_t al, ah, bl, bh, cl, ch;
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/* Separate the bytes to avoid false positives. */
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al = a & mask;
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bl = b & mask;
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ah = (a >> 8) & mask;
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bh = (b >> 8) & mask;
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/* "Compare". If a byte in B is greater than a byte in A,
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it will clear the test bit. */
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cl = ((al | test) - bl) & test;
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ch = ((ah | test) - bh) & test;
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/* Fold all of the test bits into a contiguous set. */
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/* ch=.......a...............c...............e...............g........ */
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/* cl=.......b...............d...............f...............h........ */
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cl += ch << 1;
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/* cl=......ab..............cd..............ef..............gh........ */
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cl |= cl << 14;
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/* cl=......abcd............cdef............efgh............gh........ */
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cl |= cl << 28;
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/* cl=......abcdefgh........cdefgh..........efgh............gh........ */
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return cl >> 50;
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}
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uint64_t helper_minub8(uint64_t op1, uint64_t op2)
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{
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uint64_t res = 0;
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uint8_t opa, opb, opr;
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int i;
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for (i = 0; i < 8; ++i) {
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opa = op1 >> (i * 8);
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opb = op2 >> (i * 8);
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opr = opa < opb ? opa : opb;
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res |= (uint64_t)opr << (i * 8);
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}
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return res;
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}
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uint64_t helper_minsb8(uint64_t op1, uint64_t op2)
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{
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uint64_t res = 0;
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int8_t opa, opb;
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uint8_t opr;
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int i;
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for (i = 0; i < 8; ++i) {
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opa = op1 >> (i * 8);
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opb = op2 >> (i * 8);
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opr = opa < opb ? opa : opb;
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res |= (uint64_t)opr << (i * 8);
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}
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return res;
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}
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uint64_t helper_minuw4(uint64_t op1, uint64_t op2)
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{
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uint64_t res = 0;
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uint16_t opa, opb, opr;
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int i;
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for (i = 0; i < 4; ++i) {
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opa = op1 >> (i * 16);
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opb = op2 >> (i * 16);
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opr = opa < opb ? opa : opb;
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res |= (uint64_t)opr << (i * 16);
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}
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return res;
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}
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uint64_t helper_minsw4(uint64_t op1, uint64_t op2)
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{
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uint64_t res = 0;
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int16_t opa, opb;
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uint16_t opr;
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int i;
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for (i = 0; i < 4; ++i) {
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opa = op1 >> (i * 16);
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opb = op2 >> (i * 16);
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opr = opa < opb ? opa : opb;
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res |= (uint64_t)opr << (i * 16);
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}
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return res;
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}
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uint64_t helper_maxub8(uint64_t op1, uint64_t op2)
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{
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uint64_t res = 0;
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uint8_t opa, opb, opr;
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int i;
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for (i = 0; i < 8; ++i) {
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opa = op1 >> (i * 8);
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opb = op2 >> (i * 8);
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opr = opa > opb ? opa : opb;
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res |= (uint64_t)opr << (i * 8);
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}
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return res;
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}
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uint64_t helper_maxsb8(uint64_t op1, uint64_t op2)
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{
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uint64_t res = 0;
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int8_t opa, opb;
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uint8_t opr;
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int i;
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for (i = 0; i < 8; ++i) {
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opa = op1 >> (i * 8);
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opb = op2 >> (i * 8);
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opr = opa > opb ? opa : opb;
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res |= (uint64_t)opr << (i * 8);
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}
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return res;
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}
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uint64_t helper_maxuw4(uint64_t op1, uint64_t op2)
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{
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uint64_t res = 0;
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uint16_t opa, opb, opr;
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int i;
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for (i = 0; i < 4; ++i) {
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opa = op1 >> (i * 16);
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opb = op2 >> (i * 16);
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opr = opa > opb ? opa : opb;
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res |= (uint64_t)opr << (i * 16);
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}
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return res;
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}
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uint64_t helper_maxsw4(uint64_t op1, uint64_t op2)
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{
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uint64_t res = 0;
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int16_t opa, opb;
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uint16_t opr;
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int i;
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for (i = 0; i < 4; ++i) {
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opa = op1 >> (i * 16);
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opb = op2 >> (i * 16);
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opr = opa > opb ? opa : opb;
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res |= (uint64_t)opr << (i * 16);
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}
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return res;
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}
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uint64_t helper_perr(uint64_t op1, uint64_t op2)
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{
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uint64_t res = 0;
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uint8_t opa, opb, opr;
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int i;
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for (i = 0; i < 8; ++i) {
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opa = op1 >> (i * 8);
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opb = op2 >> (i * 8);
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if (opa >= opb) {
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opr = opa - opb;
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} else {
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opr = opb - opa;
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}
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res += opr;
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}
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return res;
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}
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uint64_t helper_pklb(uint64_t op1)
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{
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return (op1 & 0xff) | ((op1 >> 24) & 0xff00);
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}
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uint64_t helper_pkwb(uint64_t op1)
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{
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return ((op1 & 0xff)
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| ((op1 >> 8) & 0xff00)
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| ((op1 >> 16) & 0xff0000)
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| ((op1 >> 24) & 0xff000000));
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}
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uint64_t helper_unpkbl(uint64_t op1)
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{
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return (op1 & 0xff) | ((op1 & 0xff00) << 24);
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}
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uint64_t helper_unpkbw(uint64_t op1)
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{
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return ((op1 & 0xff)
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| ((op1 & 0xff00) << 8)
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| ((op1 & 0xff0000) << 16)
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| ((op1 & 0xff000000) << 24));
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}
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void helper_check_overflow(CPUAlphaState *env, uint64_t op1, uint64_t op2)
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{
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if (unlikely(op1 != op2)) {
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arith_excp(env, GETPC(), EXC_M_IOV, 0);
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}
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}
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