On 2021/8/12 下午12:42, Richard Henderson wrote:
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.
Sorry, I don't get "the mistake" here. Do you think the specification is
not right.
Or the QEMU implementation of this patch set is not right?
Currently I don't know there is a 64-bit hardware which has done with
UXL32.
They should simply have had "addw" and "addq" as different opcodes
that didn't change behaviour. Etc.
I don't get this statement. Is it related to UXL32?
Best Regards,
Zhiwei
But what's done is done.
r~
