On Tue, 11 Oct 2022 at 07:57, gaosong <gaos...@loongson.cn> wrote: > > > 在 2022/10/10 22:43, Peter Maydell 写道: > > On Mon, 10 Oct 2022 at 15:20, Richard Henderson > > <richard.hender...@linaro.org> wrote: > >> On 9/17/22 00:43, Song Gao wrote: > >>> We can use alternate stack, so that we can use sp register as > >>> intput/ouput register. > >>> I had tested aarch64/LoongArch architecture. > >>> > >>> Signed-off-by: Song Gao<gaos...@loongson.cn> > >>> --- > >>> risu.c | 16 +++++++++++++++- > >>> 1 file changed, 15 insertions(+), 1 deletion(-) > >> Good idea. > > Depending on the architecture there might still need to be > > restrictions on use of the stack pointer, eg aarch64's > > alignment requirements, but this at least means you can > > in theory write some risu rules that use SP. > I really want use alternate stack, this way can reduce risu rules. > what about use this only on LoongArch architecture ?
I just mean that although this patch is fine it might still mean that depending on the architecture some care and/or special casing of sp in the target risu rules might be needed. I don't know if that applies to loongarch or not. -- PMM
