py/emitnative: Emit shorter exception handler entry code on RV32.

This commit improves the RV32 code sequence that is emitted if a
function needs to set up an exception handler as its prologue.

The old code would clear a temporary register and then copy that value
to places that needed to be initialised with zero values.  On RV32
there's a dedicated register that's hardwired to be equal to zero, which
allows us to bypass the extra register clear and use the zero register
to initialise values.

Signed-off-by: Alessandro Gatti <a.gatti@frob.it>

0 files changed, 0 insertions, 0 deletions