2021-10-02 15:17:04 +00:00
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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2021-09-04 07:58:21 +00:00
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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2021-10-02 15:17:04 +00:00
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#include "libc/nexgen32e/bsr.h"
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#include "libc/nexgen32e/x86feature.h"
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#include "tool/build/lib/clmul.h"
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#include "tool/build/lib/endian.h"
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#include "tool/build/lib/modrm.h"
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2021-09-04 07:58:21 +00:00
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2021-10-02 15:17:04 +00:00
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/**
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* @fileoverview Carryless Multiplication ISA
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*/
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2021-09-04 07:58:21 +00:00
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2021-10-02 15:17:04 +00:00
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struct clmul {
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uint64_t x, y;
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};
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2021-09-04 07:58:21 +00:00
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2021-10-02 15:17:04 +00:00
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static struct clmul clmul(uint64_t a, uint64_t b) {
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uint64_t t, x = 0, y = 0;
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if (a && b) {
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if (bsrl(a) < bsrl(b)) t = a, a = b, b = t;
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for (t = 0; b; a <<= 1, b >>= 1) {
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if (b & 1) x ^= a, y ^= t;
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t = t << 1 | a >> 63;
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}
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2021-09-04 07:58:21 +00:00
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}
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2021-10-02 15:17:04 +00:00
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return (struct clmul){x, y};
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}
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2021-09-04 07:58:21 +00:00
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2021-10-02 15:17:04 +00:00
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void OpSsePclmulqdq(struct Machine *m, uint32_t rde) {
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struct clmul res;
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res = clmul(Read64(XmmRexrReg(m, rde) + ((m->xedd->op.uimm0 & 0x01) << 3)),
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Read64(GetModrmRegisterXmmPointerRead16(m, rde) +
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((m->xedd->op.uimm0 & 0x10) >> 1)));
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Write64(XmmRexrReg(m, rde) + 0, res.x);
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Write64(XmmRexrReg(m, rde) + 8, res.y);
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2021-09-04 07:58:21 +00:00
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}
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