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author | Florian Dold <florian.dold@gmail.com> | 2017-05-03 15:35:00 +0200 |
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committer | Florian Dold <florian.dold@gmail.com> | 2017-05-03 15:35:00 +0200 |
commit | de98e0b232509d5f40c135d540a70e415272ff85 (patch) | |
tree | a79222a5b58484ab3b80d18efcaaa7ccc4769b33 /node_modules/bn.js/util | |
parent | e0c9d480a73fa629c1e4a47d3e721f1d2d345406 (diff) | |
download | wallet-core-de98e0b232509d5f40c135d540a70e415272ff85.tar.xz |
node_modules
Diffstat (limited to 'node_modules/bn.js/util')
-rw-r--r-- | node_modules/bn.js/util/genCombMulTo.js | 65 | ||||
-rw-r--r-- | node_modules/bn.js/util/genCombMulTo10.js | 65 |
2 files changed, 130 insertions, 0 deletions
diff --git a/node_modules/bn.js/util/genCombMulTo.js b/node_modules/bn.js/util/genCombMulTo.js new file mode 100644 index 000000000..8b456c7c6 --- /dev/null +++ b/node_modules/bn.js/util/genCombMulTo.js @@ -0,0 +1,65 @@ +'use strict'; + +// NOTE: This could be potentionally used to generate loop-less multiplications +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('var w' + k + ' = c;'); + src.push('c = 0;'); + for (var j = minJ; j <= maxJ; j++) { + i = k - j; + + src.push('lo = Math.imul(al' + i + ', bl' + j + ');'); + src.push('mid = Math.imul(al' + i + ', bh' + j + ');'); + src.push('mid = (mid + Math.imul(ah' + i + ', bl' + j + ')) | 0;'); + src.push('hi = Math.imul(ah' + i + ', bh' + j + ');'); + + src.push('w' + k + ' = (w' + k + ' + lo) | 0;'); + src.push('w' + k + ' = (w' + k + ' + ((mid & 0x1fff) << 13)) | 0;'); + src.push('c = (c + hi) | 0;'); + src.push('c = (c + (mid >>> 13)) | 0;'); + src.push('c = (c + (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)); diff --git a/node_modules/bn.js/util/genCombMulTo10.js b/node_modules/bn.js/util/genCombMulTo10.js new file mode 100644 index 000000000..cf2e6e803 --- /dev/null +++ b/node_modules/bn.js/util/genCombMulTo10.js @@ -0,0 +1,65 @@ +'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)); |