This commit adds support for Zba opcodes to the RV32 inline assembler.
Three new opcodes were added, SH1ADD, SH2ADD, and SH3ADD, which performs
a scaled addition (by 1, 2, or 3 bits respectively). At the moment only
qemu's VIRT_RV32 and rp2's RPI_PICO2/RPI_PICO2_W ports support these
opcodes (the latter only when using the RISCV variant).
Signed-off-by: Alessandro Gatti <a.gatti@frob.it>
Otherwise, when compiling on 16-bit systems (where `mp_uint_t` is 16 bits
wide) the compiler warns about "left shift count >= width of type", from
the static inline functions that have RV32_ENCODE_TYPE_xxx macros which
do a lot of bit shifting.
Signed-off-by: Damien George <damien@micropython.org>
This commit introduces a few changes aimed at reducing the amount of
space taken by the inline assembler once compiled:
* The register string table uses 2 bytes for each qstr rather than the
usual 4
* The opcode table uses 2 bytes for each qstr rather than the usual 4
* Opcode masks are not embedded in each opcode entry but looked up via
an additional smaller table, reducing the number of bytes taken by
an opcode's masks from 12 to 2 (with a fixed overhead of 24 bytes for
the the masks themselves stored elsewhere)
* Some error messages had a trailing period, now removed
* Error messages have been parameterised when possible, and the overall
text length is smaller.
Signed-off-by: Alessandro Gatti <a.gatti@frob.it>
This commit fixes a compilation warning (turned error) about a
potentially uninitialised variable being used. The warning can be
ignored as the variable in question is always written to, but the code
has been changed to silence that warning.
Signed-off-by: Alessandro Gatti <a.gatti@frob.it>
This commit adds support for writing inline assembler functions when
targeting a RV32IMC processor.
Given that this takes up a bit of rodata space due to its large
instruction decoding table and its extensive error messages, it is
enabled by default only on offline targets such as mpy-cross and the
qemu port.
Signed-off-by: Alessandro Gatti <a.gatti@frob.it>
