On 8/11/21 12:40 PM, LIU Zhiwei wrote:
If the software doesn't use the high part, who cares the really value in high part? Do you
know the benefit? Thanks again.
I do not.
I simply presume that they already have the hardware, in the form of the addw instruction,
etc.
The mistake, I think, was changing the definition of "add" in the first place, which
required the addition of a different opcode "addw", which is then undefined for RV32.
They should simply have had "addw" and "addq" as different opcodes that didn't change
behaviour. Etc.
But what's done is done.
r~
