mpy-cross/main: Add support for RV32 Zba opcodes.

This commit adds a new command line switch to inform the RV32 emitter to
use Zba opcodes in its output.

A new implementation-specific option was introduced, called
"-march-flags", that will contain a list of additional
architecture-specific flags to pass to the chosen native emitter
implementation.

At the moment only the RV32 emitter can make use of this command line
facility: if the architecture flags string equals to "zba"
(case-sensitive), then the native emitter will emit Zba opcodes if it
has a chance to do so.

At the moment there is no check on whether additional architecture flags
using to build a MPY file are compatible with the target the output code
is run on, so use this with caution.

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

0 files changed, 0 insertions, 0 deletions