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127 lines
4.2 KiB
127 lines
4.2 KiB
/*
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Copyright 2019 0KIMS association.
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This file is part of websnark (Web Assembly zkSnark Prover).
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websnark is a free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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websnark is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License 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 websnark. If not, see <https://www.gnu.org/licenses/>.
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*/
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module.exports = function buildMem(module, prefix, prefixField) {
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function buildCopy() {
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const f = module.addFunction(prefix+"copy");
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f.addParam("s", "i32");
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f.addParam("d", "i32");
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f.addParam("n", "i32");
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f.addLocal("bytesAfter", "i32");
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f.addLocal("sp", "i32");
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const c = f.getCodeBuilder();
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f.addCode(
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c.setLocal(
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"n64",
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c.i32_shl(
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c.getLocal("n"),
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c.i32_const(3)
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)
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),
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c.setLocal(
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"bytesAfter",
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c.i32_and(
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c.getLocal("n"),
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c.i32_const(0x7)
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)
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),
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c.setLocal("sp", c.getLocal("s")),
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c.setLocal("dp", c.getLocal("d")),
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c.setLocal("lastsp",
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c.add(
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c.getLocal("s"),
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c.i32_and(
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c.getLocal("n"),
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c.i32_const(0xFFFFFFF8)
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)
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)
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),
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c.block(c.loop(
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c.br_if(
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1,
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c.i32_eq(
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c.getLocal("sp"),
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c.getLocal("lastsp")
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)
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),
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c.i64_store(
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c.getLocal("dp"),
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c.i64_load(
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c.getLocal("sp")
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)
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),
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c.setLocal("sp", c.i32_add(c.getLocal("sp"), c.i32_const(8))),
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c.setLocal("dp", c.i32_add(c.getLocal("dp"), c.i32_const(8))),
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c.br(0)
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)),
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c.if(
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c.getLocal("bytesAfter"),
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[
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...c.if(
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c.i32_and(c.getLocal("bytesAfter"), c.i32_const(0x4)),
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[
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...c.i32_store(
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c.getLocal("dp"),
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c.i32_load(
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c.getLocal("sp")
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)
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),
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...c.setLocal("sp", c.i32_add(c.getLocal("sp"), c.i32_const(4))),
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...c.setLocal("dp", c.i32_add(c.getLocal("dp"), c.i32_const(4))),
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]
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),
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...c.if(
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c.i32_and(c.getLocal("bytesAfter"), c.i32_const(0x2)),
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[
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...c.i32_store16(
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c.getLocal("dp"),
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c.i32_load16(
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c.getLocal("sp")
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)
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),
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...c.setLocal("sp", c.i32_add(c.getLocal("sp"), c.i32_const(2))),
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...c.setLocal("dp", c.i32_add(c.getLocal("dp"), c.i32_const(2))),
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]
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),
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...c.if(
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c.i32_and(c.getLocal("bytesAfter"), c.i32_const(0x1)),
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c.i32_store8(
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c.getLocal("dp"),
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c.i32_load8(
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c.getLocal("sp")
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)
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)
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)
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]
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)
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);
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}
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buildCopy();
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module.exportFunction(prefix+"_copy");
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return prefix;
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};
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