tree 110de7b288b7d54d2b5e7dd7635bb42aa1205497
parent 7999f7e1273b63ec3a60d8cf2cb79cb88575744a
author Richard Henderson <rth@twiddle.net> 1319750100 -0700
committer Blue Swirl <blauwirbel@gmail.com> 1319965583 +0000

tcg: Optimize some forms of deposit.

If the deposit replaces the entire word, optimize to a move.

If we're inserting to the top of the word, avoid the mask of arg2
as we'll be shifting out all of the garbage and shifting in zeros.

If the host is 32-bit, reduce a 64-bit deposit to a 32-bit deposit
when possible.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>