buffer: optimize readDouble and readFloat methods
Compute the floating point number in JavaScript to avoid having to call out to the C++ runtime. The improvements are not insubstantial:
improvement confidence p.value
value="big" endian="BE" type="Double" noAssert="false" 292.86 % *** 1.688367e-08
value="big" endian="BE" type="Double" noAssert="true" 353.19 % *** 6.079414e-10
value="big" endian="BE" type="Float" noAssert="false" 406.21 % *** 1.730122e-07
value="big" endian="BE" type="Float" noAssert="true" 450.81 % *** 6.909242e-07
value="big" endian="LE" type="Double" noAssert="false" 268.39 % *** 8.625486e-09
value="big" endian="LE" type="Double" noAssert="true" 310.66 % *** 2.798332e-15
value="big" endian="LE" type="Float" noAssert="false" 382.99 % *** 3.412057e-07
value="big" endian="LE" type="Float" noAssert="true" 394.60 % *** 1.406742e-07
value="inf" endian="BE" type="Double" noAssert="false" 312.91 % *** 7.407943e-12
value="inf" endian="BE" type="Double" noAssert="true" 392.47 % *** 3.821179e-08
value="inf" endian="BE" type="Float" noAssert="false" 466.01 % *** 8.953363e-08
value="inf" endian="BE" type="Float" noAssert="true" 460.76 % *** 5.381256e-09
value="inf" endian="LE" type="Double" noAssert="false" 279.50 % *** 2.390682e-09
value="inf" endian="LE" type="Double" noAssert="true" 335.30 % *** 3.587173e-09
value="inf" endian="LE" type="Float" noAssert="false" 439.77 % *** 1.057133e-07
value="inf" endian="LE" type="Float" noAssert="true" 426.72 % *** 4.353408e-09
value="nan" endian="BE" type="Double" noAssert="false" 271.18 % *** 2.281526e-05
value="nan" endian="BE" type="Double" noAssert="true" 312.63 % *** 1.974975e-07
value="nan" endian="BE" type="Float" noAssert="false" 429.17 % *** 2.416228e-07
value="nan" endian="BE" type="Float" noAssert="true" 461.39 % *** 1.956714e-08
value="nan" endian="LE" type="Double" noAssert="false" 267.03 % *** 9.938479e-12
value="nan" endian="LE" type="Double" noAssert="true" 276.93 % *** 7.842481e-08
value="nan" endian="LE" type="Float" noAssert="false" 415.97 % *** 8.082710e-07
value="nan" endian="LE" type="Float" noAssert="true" 433.68 % *** 1.030200e-07
value="small" endian="BE" type="Double" noAssert="false" 273.20 % *** 9.071652e-11
value="small" endian="BE" type="Double" noAssert="true" 326.25 % *** 3.120167e-08
value="small" endian="BE" type="Float" noAssert="false" 845.61 % *** 8.044170e-08
value="small" endian="BE" type="Float" noAssert="true" 868.61 % *** 2.944539e-08
value="small" endian="LE" type="Double" noAssert="false" 251.29 % *** 5.613930e-09
value="small" endian="LE" type="Double" noAssert="true" 286.82 % *** 8.149603e-10
value="small" endian="LE" type="Float" noAssert="false" 824.87 % *** 1.199729e-08
value="small" endian="LE" type="Float" noAssert="true" 834.35 % *** 4.799620e-08
value="zero" endian="BE" type="Double" noAssert="false" 216.70 % *** 3.872293e-12
value="zero" endian="BE" type="Double" noAssert="true" 239.31 % *** 6.439601e-09
value="zero" endian="BE" type="Float" noAssert="false" 353.75 % *** 3.639974e-07
value="zero" endian="BE" type="Float" noAssert="true" 388.86 % *** 7.074318e-10
value="zero" endian="LE" type="Double" noAssert="false" 179.34 % *** 5.230763e-06
value="zero" endian="LE" type="Double" noAssert="true" 199.66 % *** 2.177589e-11
value="zero" endian="LE" type="Float" noAssert="false" 299.55 % *** 9.961978e-08
value="zero" endian="LE" type="Float" noAssert="true" 333.30 % *** 2.470764e-08