Hi Brian, Looks OK.
On 09/23/2014 01:10 AM, Brian Burkhalter wrote: > Summary: Change constructs like “a * B / C” and “u / V * W” to “x * > (Y / Z)” where lower case denotes a variable and upper case a > constant. This forces the constant value (Y / Z) to be evaluated only > once per VM instance, and replaces division of the variable with > multiplication. The resulting performance improvement is more than > 300% as measure by JMH on a MacBookPro11,1 dual core i7 running Mac > OS 10.9.5. Hm, and this compiler transformation works in strictfp context? I hope compilers do the constant folding in strictfp/fdlibm mode... I would probably just go and declare the private compile-time constants. This is safer, since: a) you are not at the mercy of optimizing compiler anymore (have you tried the benchmark with C1?); b) the initializing expressions are FP-strict, less opportunity for hard to diagnose numeric problem. -Aleksey.
