On 09/06/2011 05:51 PM, Charles Oliver Nutter wrote: > On Tue, Sep 6, 2011 at 10:39 AM, Rémi Forax<fo...@univ-mlv.fr> wrote: >> Yes, but don't forget that PHP.reboot has no overflow check. > Did we ever figure out if it's possible to trick Hotspot into doing a > JO instead of the raw bit-level operations? John/Christian/Tom: what > would it take to get HS to "know" that we're doing an integer > overflow-after-maths check and do the (faster?) JO? > > Rémi: For what it's worth, I did specialize +/- for 1 and 2 in the > indy-based call protocols to avoid a full overflow check.
If you have specialize for -2/+2, you should reuse exactly the same code for +n/-n. see https://code.google.com/p/jsr292-cookbook/source/browse/trunk/binary-operation/src/jsr292/cookbook/binop/RT.java#11 > > - Charlie Rémi _______________________________________________ mlvm-dev mailing list mlvm-dev@openjdk.java.net http://mail.openjdk.java.net/mailman/listinfo/mlvm-dev
