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Diffstat (limited to 'src/parseTools.js')
| -rw-r--r-- | src/parseTools.js | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/parseTools.js b/src/parseTools.js index f5e2f33f..40051e29 100644 --- a/src/parseTools.js +++ b/src/parseTools.js @@ -1045,9 +1045,14 @@ function asmCoercion(value, type, signedness) { } } +var TWO_TWENTY = Math.pow(2, 20); + function asmMultiplyI32(a, b) { // special-case: there is no integer multiply in asm, because there is no true integer // multiply in JS. While we wait for Math.imul, do double multiply + if ((isNumber(a) && Math.abs(a) < TWO_TWENTY) || (isNumber(b) && Math.abs(b) < TWO_TWENTY)) { + return '(((' + a + ')*(' + b + '))&-1)'; // small enough to emit directly as a multiply + } if (USE_MATH_IMUL) { return 'Math.imul(' + a + ',' + b + ')'; } |