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Optimization of the int_mul code

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This commit is contained in:
Jordi Baylina 2019-06-25 11:08:40 +02:00
parent 6c5cf8d4e5
commit 4e6f320667
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GPG Key ID: 7480C80C1BE43112
10 changed files with 260 additions and 55 deletions
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2
build/groth16_wasm.js
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2
build/websnark.js
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12
example/index.html
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@ -35,7 +35,17 @@ function calcProof() {
});
}
function test() {
function test(funcName, a, b, r, n) {
const start = new Date().getTime();
window.groth16.instance.exports[funcName](a,b,r, n);
const end = new Date().getTime();
const time = end - start;
console.log("Time (ms): " + time);
}
function test2() {
const groth16 = window.groth16;
const nSignals = 1;

2
example/websnark.js
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101
src/build_int.js
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@ -284,9 +284,106 @@ module.exports = function buildInt(module, n64, _prefix) {
function buildMul() {
const f = module.addFunction(prefix+"_mul");
f.addParam("x", "i32");
f.addParam("y", "i32");
f.addParam("r", "i32");
f.addLocal("c0", "i64");
f.addLocal("c1", "i64");
for (let i=0;i<n32; i++) {
f.addLocal("x"+i, "i64");
f.addLocal("y"+i, "i64");
}
const c = f.getCodeBuilder();
const loadX = [];
const loadY = [];
function mulij(i, j) {
let X,Y;
if (!loadX[i]) {
X = c.teeLocal("x"+i, c.i64_load32_u( c.getLocal("x"), i*4));
loadX[i] = true;
} else {
X = c.getLocal("x"+i);
}
if (!loadY[j]) {
Y = c.teeLocal("y"+j, c.i64_load32_u( c.getLocal("y"), j*4));
loadY[j] = true;
} else {
Y = c.getLocal("y"+j);
}
return c.i64_mul( X, Y );
}
let c0 = "c0";
let c1 = "c1";
for (let k=0; k<n32*2-1; k++) {
for (let i=Math.max(0, k-n32+1); (i<=k)&&(i<n32); i++) {
const j= k-i;
f.addCode(
c.setLocal(c0,
c.i64_add(
c.i64_and(
c.getLocal(c0),
c.i64_const(0xFFFFFFFF)
),
mulij(i,j)
)
)
);
f.addCode(
c.setLocal(c1,
c.i64_add(
c.getLocal(c1),
c.i64_shr_u(
c.getLocal(c0),
c.i64_const(32)
)
)
)
);
}
f.addCode(
c.i64_store32(
c.getLocal("r"),
k*4,
c.getLocal(c0)
)
);
[c0, c1] = [c1, c0];
f.addCode(
c.setLocal(c1,
c.i64_shr_u(
c.getLocal(c0),
c.i64_const(32)
)
)
);
}
f.addCode(
c.i64_store32(
c.getLocal("r"),
n32*4*2-4,
c.getLocal(c0)
)
);
}
function buildMulOld() {
const mulBuff = module.alloc(n32*n32*8);
const f = module.addFunction(prefix+"_mul");
const f = module.addFunction(prefix+"_mulOld");
f.addParam("x", "i32");
f.addParam("y", "i32");
f.addParam("r", "i32");
@ -843,6 +940,7 @@ module.exports = function buildInt(module, n64, _prefix) {
buildAdd();
buildSub();
buildMul();
buildMulOld();
buildDiv();
buildInverseMod();
module.exportFunction(prefix+"_copy");
@ -853,6 +951,7 @@ module.exports = function buildInt(module, n64, _prefix) {
module.exportFunction(prefix+"_gte");
module.exportFunction(prefix+"_add");
module.exportFunction(prefix+"_sub");
module.exportFunction(prefix+"_mulOld");
module.exportFunction(prefix+"_mul");
module.exportFunction(prefix+"_div");
module.exportFunction(prefix+"_inverseMod");

23
src/build_test.js Normal file
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@ -0,0 +1,23 @@
function buildTest(module, fn) {
const f = module.addFunction("test_"+fn);
f.addParam("x", "i32");
f.addParam("y", "i32");
f.addParam("r", "i32");
f.addParam("n", "i32");
f.addLocal("i", "i32");
const c = f.getCodeBuilder();
f.addCode(c.setLocal("i", c.getLocal("n")));
f.addCode(c.block(c.loop(
c.call(fn, c.getLocal("x"), c.getLocal("y"), c.getLocal("r")),
c.setLocal("i", c.i32_sub(c.getLocal("i"), c.i32_const(1))),
c.br_if(1, c.i32_eqz ( c.getLocal("i") )),
c.br(0)
)));
module.exportFunction("test_"+fn);
}
module.exports = buildTest;

25
test/helpers/helpers.js Normal file
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@ -0,0 +1,25 @@
const bigInt = require("big-integer");
function genValues(n, neg, bitsPerWord) {
bitsPerWord = bitsPerWord || 32;
const res = [];
res.push(bigInt.zero);
for (let i=0; i<n; i++) {
if (i>0) {
res.push( bigInt.one.shiftLeft(bitsPerWord*i).minus(1));
}
if (i<n-1) {
res.push( bigInt.one.shiftLeft(bitsPerWord*i));
res.push( bigInt.one.shiftLeft(bitsPerWord*i).add(1));
}
}
if (neg) {
const nt= res.length;
for (let i=0; i<nt; i++) res.push(bigInt.zero.minus(res[i]));
}
return res;
}
module.exports.genValues = genValues;

84
test/int.js Normal file
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@ -0,0 +1,84 @@
const assert = require("assert");
const bigInt = require("big-integer");
const buildProtoboard = require("../src/protoboard.js");
const buildInt = require("../src/build_int.js");
const buildTest = require("../src/build_test.js");
const helpers = require("./helpers/helpers.js");
describe("Basic tests for Int", () => {
let pbInt;
before(async () => {
pbInt = await buildProtoboard((module) => {
buildInt(module, 4);
buildTest(module, "int_mul");
buildTest(module, "int_mulOld");
}, 32);
});
it("It should do a basic multiplication", async () => {
let c;
const pA = pbInt.alloc();
const pB = pbInt.alloc();
const pC = pbInt.alloc(64);
const values = helpers.genValues(8, false);
for (let i=0; i<values.length; i++) {
for (let j=0; j<values.length; j++) {
pbInt.set(pA, values[i]);
pbInt.set(pB, values[j]);
// console.log(values[i].toString(16));
// console.log(values[j].toString(16));
pbInt.int_mul(pA, pB, pC);
c = pbInt.get(pC, 1, 64);
// console.log("Result: " + c.toString(16));
// console.log("Refere: " + values[i].times(values[j]).toString(16));
assert(c.equals(values[i].times(values[j])));
}
}
});
it("It should profile int", async () => {
const pA = pbInt.alloc();
const pB = pbInt.alloc();
const pC = pbInt.alloc(64);
let start, end, time;
const A = bigInt.one.shiftLeft(256).minus(1);
const B = bigInt.one.shiftLeft(256).minus(1);
pbInt.set(pA, A);
pbInt.set(pB, B);
start = new Date().getTime();
pbInt.test_int_mul(pA, pB, pC, 50000000);
end = new Date().getTime();
time = end - start;
const c1 = pbInt.get(pC, 1, 64);
assert(c1.equals(A.times(B)));
console.log("Mul Time (ms): " + time);
start = new Date().getTime();
pbInt.test_int_mulOld(pA, pB, pC, 50000000);
end = new Date().getTime();
time = end - start;
const c2 = pbInt.get(pC, 1, 64);
assert(c2.equals(A.times(B)));
console.log("Mul Old Time (ms): " + time);
}).timeout(10000000);
});

59
test/tomcook.js
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@ -4,49 +4,11 @@ const bigInt = require("big-integer");
const buildProtoboard = require("../src/protoboard.js");
const buildTomCook = require("../src/build_tomcook.js");
const buildInt = require("../src/build_int.js");
const buildTest = require("../src/build_test.js");
const helpers = require("./helpers/helpers.js");
function buildTest(module, fn) {
const f = module.addFunction("test_"+fn);
f.addParam("x", "i32");
f.addParam("y", "i32");
f.addParam("r", "i32");
f.addParam("n", "i32");
f.addLocal("i", "i32");
const c = f.getCodeBuilder();
f.addCode(c.setLocal("i", c.getLocal("n")));
f.addCode(c.block(c.loop(
c.call(fn, c.getLocal("x"), c.getLocal("y"), c.getLocal("r")),
c.setLocal("i", c.i32_sub(c.getLocal("i"), c.i32_const(1))),
c.br_if(1, c.i32_eqz ( c.getLocal("i") )),
c.br(0)
)));
module.exportFunction("test_"+fn);
}
function genValues(n, neg) {
const res = [];
res.push(bigInt.zero);
for (let i=0; i<n; i++) {
if (i>0) {
res.push( bigInt.one.shiftLeft(29*i).minus(1));
}
if (i<8) {
res.push( bigInt.one.shiftLeft(29*i));
res.push( bigInt.one.shiftLeft(29*i).add(1));
}
}
if (neg) {
const nt= res.length;
for (let i=0; i<nt; i++) res.push(bigInt.zero.minus(res[i]));
}
return res;
}
describe("Basic tests for Tom Cook Multiplication Strategy", () => {
let pbTC;
@ -67,7 +29,7 @@ describe("Basic tests for Tom Cook Multiplication Strategy", () => {
let c;
const pA = pbTC.alloc(6*4);
const values = genValues(6, true);
const values = helpers.genValues(6, true, 29);
for (let i=0; i<values.length; i++) {
pbTC.set(pA, values[i], 24);
@ -81,7 +43,7 @@ describe("Basic tests for Tom Cook Multiplication Strategy", () => {
let c;
const pA = pbTC.alloc(6*4);
const values = genValues(6, true);
const values = helpers.genValues(6, true, 29);
for (let i=0; i<values.length; i++) {
pbTC.set(pA, values[i], 24);
@ -96,7 +58,7 @@ describe("Basic tests for Tom Cook Multiplication Strategy", () => {
let c;
const pA = pbTC.alloc(6*4);
const values = genValues(6, true);
const values = helpers.genValues(6, true, 29);
for (let i=0; i<values.length; i++) {
// console.log(values[i].toString(16));
@ -114,7 +76,7 @@ describe("Basic tests for Tom Cook Multiplication Strategy", () => {
const pB = pbTC.alloc();
const pC = pbTC.alloc(24);
const values = genValues(3, true);
const values = helpers.genValues(3, true, 29);
for (let i=0; i<values.length; i++) {
for (let j=0; j<values.length; j++) {
@ -164,7 +126,7 @@ describe("Basic tests for Tom Cook Multiplication Strategy", () => {
const pB = pbTC.alloc(9*4);
const pC = pbTC.alloc(9*4*2);
const values = genValues(9, false);
const values = helpers.genValues(9, false, 29);
for (let i=0; i<values.length; i++) {
for (let j=0; j<values.length; j++) {
@ -186,6 +148,7 @@ describe("Basic tests for Tom Cook Multiplication Strategy", () => {
}
});
it("It should profile school", async () => {
const A = bigInt.one.shiftLeft(254).minus(1);
const B = bigInt.one.shiftLeft(254).minus(1);
@ -195,7 +158,7 @@ describe("Basic tests for Tom Cook Multiplication Strategy", () => {
const pC = pbInt.alloc(64);
const start = new Date().getTime();
pbInt.test_int_mul(pA, pB, pC, 100000000);
pbInt.test_int_mul(pA, pB, pC, 10000000);
const end = new Date().getTime();
const time = end - start;
@ -225,7 +188,7 @@ describe("Basic tests for Tom Cook Multiplication Strategy", () => {
// console.log("Mul1 Tom Cook Time (ms): " + time);
start = new Date().getTime();
pbTC.test_tomcook_mul9(pA, pB, pC, 100000000);
pbTC.test_tomcook_mul9(pA, pB, pC, 10000000);
end = new Date().getTime();
time = end - start;

5
tools/buildwasm.js
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@ -4,10 +4,10 @@ const buildF1m = require("../src/build_f1m.js");
const buildF2m = require("../src/build_f2m.js");
const buildF1 = require("../src/build_f1.js");
const buildCurve = require("../src/build_curve.js");
const buildTest = require("../src/build_testg1");
const buildFFT = require("../src/build_fft");
const buildMultiexp = require("../src/build_multiexp");
const buildPol = require("../src/build_pol");
const buildTest = require("../src/build_test");
const utils = require("../src/utils");
const fs = require("fs");
const path = require("path");
@ -37,7 +37,8 @@ function buildWasm() {
buildCurve(moduleBuilder, "g2", "f2m");
buildMultiexp(moduleBuilder, "g2", "g2", "f2m", "fr");
buildTest(moduleBuilder);
buildTest(moduleBuilder, "int_mul");
buildTest(moduleBuilder, "int_mulOld");
const code = moduleBuilder.build();