Hi, The proposed changeset is to improve the performance (both speed and memory usage) of String.toLowerCase/toUpperCase, by
(1) to separate the "most likely" use scenario (non supplementary character, no special case mapping handling) into simple/quick iteration loop code path (2) to use the package private constructor String(char[], boolean) to avoid unnecessary target char[] copy in fast-path case. (3) some tiny code cleanup. Since it's supposed to be a simple/quick round of code cleanup, I did not go too far to optimize the supplementary/special mapping code. The webrev is http://cr.openjdk.java.net/~sherman/8032012/ My small non-scientific speed measurement test suggests we can get 25% to 40% speed boost. http://cr.openjdk.java.net/~sherman/str_toCase/TestToCase.java Thanks! -Sherman
