diff options
Diffstat (limited to 'src/runtime.js')
| -rw-r--r-- | src/runtime.js | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/src/runtime.js b/src/runtime.js index 9d5e5e1f..d1475bd4 100644 --- a/src/runtime.js +++ b/src/runtime.js @@ -123,42 +123,45 @@ var Runtime = { FLOAT_TYPES: set('float', 'double'), // Mirrors processMathop's treatment of constants (which we optimize directly) + BITSHIFT64_SHL: 0, + BITSHIFT64_ASHR: 1, + BITSHIFT64_LSHR: 2, bitshift64: function(low, high, op, bits) { var ret; var ander = Math.pow(2, bits)-1; if (bits < 32) { switch (op) { - case 'shl': + case Runtime.BITSHIFT64_SHL: ret = [low << bits, (high << bits) | ((low&(ander << (32 - bits))) >>> (32 - bits))]; break; - case 'ashr': + case Runtime.BITSHIFT64_ASHR: ret = [(((low >>> bits ) | ((high&ander) << (32 - bits))) >> 0) >>> 0, (high >> bits) >>> 0]; break; - case 'lshr': + case Runtime.BITSHIFT64_LSHR: ret = [((low >>> bits) | ((high&ander) << (32 - bits))) >>> 0, high >>> bits]; break; } } else if (bits == 32) { switch (op) { - case 'shl': + case Runtime.BITSHIFT64_SHL: ret = [0, low]; break; - case 'ashr': + case Runtime.BITSHIFT64_ASHR: ret = [high, (high|0) < 0 ? ander : 0]; break; - case 'lshr': + case Runtime.BITSHIFT64_LSHR: ret = [high, 0]; break; } } else { // bits > 32 switch (op) { - case 'shl': + case Runtime.BITSHIFT64_SHL: ret = [0, low << (bits - 32)]; break; - case 'ashr': + case Runtime.BITSHIFT64_ASHR: ret = [(high >> (bits - 32)) >>> 0, (high|0) < 0 ? ander : 0]; break; - case 'lshr': + case Runtime.BITSHIFT64_LSHR: ret = [high >>> (bits - 32) , 0]; break; } |