Boost performance of QChar::isDigit

Make it inline; add fast checks for ascii digits;
add fallback function that uses the fastcall calling
convention.

On ia32, this change makes isDigit ~370x faster for
ascii digit characters, ~250x faster for non-digit
ascii characters, and ~1.5x faster for non-ascii
characters.

Note that this change is NOT binary compatible.

Also add an autotest with expected results from
before the optimization, to ensure that the
behavior is the same.

Change-Id: I718fadecda3f591d6f4c22374d8e476f4724fd83
Reviewed-on: http://codereview.qt-project.org/4902
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>

0 files changed, 0 insertions, 0 deletions