On Thu, 25 Apr 2019 09:50:41 PDT (-0700), [email protected] wrote:
On 4/25/19 9:04 AM, Palmer Dabbelt wrote:
# *** RV64C Standard Extension (Quadrant 2) ***
-c_slli 000 . ..... ..... 10 @c_shift2
+slli 000 . ..... ..... 10 @c_shift2
This is another one where rd=0 is illegal in the compressed ISA, but again we
don't appear to handle these correctly before the cleanups.
I see "HINT, rd=0" in the 2.2 documentation for this case.
Looks like you're right -- I was assuming the "rd != 0" to mean that it was an
illegal instruction, but I just confirmed with Andrew that it's legal. In this
case (and probably the others I mentioned), I think QEMU is correct already.
