Il 26/08/2013 23:00, Richard Henderson ha scritto:
> Allow the code that tcg generates to be less obtuse, passing in
> the return address directly instead of computing it in the helper.
>
> Maintain the old entrance point unchanged as an alternate entry point.
>
> Delete the helper_st*_cmmu prototypes; the implementations did not exist.
>
> Signed-off-by: Richard Henderson <[email protected]>
Something that can be done on top of this patch: what about moving the
"-1" to helper_ret_*? It is common to pretty much all the targets
(except ARM has -2), and it would allow some simplifications. For
example I played with return address helpers on 32-bit PPC, and you
could use a
li rN, retaddr
mtlr rN
b st_trampoline[i]
sequence instead of one of
li rN, retaddr
mtlr rN
bl st_trampoline[i]
b retaddr
or
li rN, retaddr
mtlr rN
addi rN, rN, -1
b st_trampoline[i]
Paolo
