On Wed, May 25, 2011 at 7:00 PM, Peter Maydell <peter.mayd...@linaro.org> wrote: > This patchset is largely aimed at rolling back the changes from an > earlier patchset of mine: > http://lists.gnu.org/archive/html/qemu-devel/2011-04/msg00244.html > which made various Neon helper routines use the correct FP status > flags by having them use the global env. > > Since we've decided we're trying to get rid of the global CPUState > pointer (at least in C code), patches 1, 5, 6 here are basically > reverting patches 1,2,3 of that earlier patchset. In order not > to throw the baby out with the bathwater, patches 2, 3, 4 make > the helper routines which need to use the FP status take a pointer > to the fp status word. (In a few cases we can then merge them > with the equivalent VFP helpers.) > > This obviously still leaves some global CPUState use in op_helper.c, > but it's a move in the right direction.
Have you seen any measurable changes in performance? The discussion about the performance effect of changes like this was not very conclusive.
