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'use strict';
function genCombMulTo (alen, blen) {
var len = alen + blen - 1;
var src = [
'var a = self.words;',
'var b = num.words;',
'var o = out.words;',
'var c = 0;',
'var lo;',
'var mid;',
'var hi;'
];
for (var i = 0; i < alen; i++) {
src.push('var a' + i + ' = a[' + i + '] | 0;');
src.push('var al' + i + ' = a' + i + ' & 0x1fff;');
src.push('var ah' + i + ' = a' + i + ' >>> 13;');
}
for (i = 0; i < blen; i++) {
src.push('var b' + i + ' = b[' + i + '] | 0;');
src.push('var bl' + i + ' = b' + i + ' & 0x1fff;');
src.push('var bh' + i + ' = b' + i + ' >>> 13;');
}
src.push('');
src.push('out.negative = self.negative ^ num.negative;');
src.push('out.length = ' + len + ';');
for (var k = 0; k < len; k++) {
var minJ = Math.max(0, k - alen + 1);
var maxJ = Math.min(k, blen - 1);
src.push('\/* k = ' + k + ' *\/');
src.push('lo = Math.imul(al' + (k - minJ) + ', bl' + minJ + ');');
src.push('mid = Math.imul(al' + (k - minJ) + ', bh' + minJ + ');');
src.push(
'mid = (mid + Math.imul(ah' + (k - minJ) + ', bl' + minJ + ')) | 0;');
src.push('hi = Math.imul(ah' + (k - minJ) + ', bh' + minJ + ');');
for (var j = minJ + 1; j <= maxJ; j++) {
i = k - j;
src.push('lo = (lo + Math.imul(al' + i + ', bl' + j + ')) | 0;');
src.push('mid = (mid + Math.imul(al' + i + ', bh' + j + ')) | 0;');
src.push('mid = (mid + Math.imul(ah' + i + ', bl' + j + ')) | 0;');
src.push('hi = (hi + Math.imul(ah' + i + ', bh' + j + ')) | 0;');
}
src.push('var w' + k + ' = (((c + lo) | 0) + ((mid & 0x1fff) << 13)) | 0;');
src.push('c = (((hi + (mid >>> 13)) | 0) + (w' + k + ' >>> 26)) | 0;');
src.push('w' + k + ' &= 0x3ffffff;');
}
// Store in separate step for better memory access
for (k = 0; k < len; k++) {
src.push('o[' + k + '] = w' + k + ';');
}
src.push('if (c !== 0) {',
' o[' + k + '] = c;',
' out.length++;',
'}',
'return out;');
return src.join('\n');
}
console.log(genCombMulTo(10, 10));