Re: [PATCH v1 03/15] tcg: Fix register allocation constraints

[Richard Henderson]

On 8/14/24 10:58, LIU Zhiwei wrote:
> Thus if we want to use all registers of vectors, we have to add a dynamic constraint on 
> register allocation based on IR types.

My comment vs patch 4 is that you can't do that, at least not without large 
changes to TCG.

In addition, I said that the register pressure on vector regs is not high enough to 
justify such changes.  There is, so far, little benefit in having more than 4 or 5 vector 
registers, much less 32.  Thus 7 (lmul 4, omitting v0) is sufficient.


r~