Christian Bruel <christian.br...@st.com> wrote:
> So, Just removing DF_HI_REGS seems to fix the issue with strictly same
> performance results for SH4.
>
> No regressions in the testsuite for
> sh-sim//-m2/
> sh-sim//-m2a/
> sh-sim//-m2a-nofpu/
> sh-sim//-m2a-single/
> sh-sim//-m2a-single-only/
> sh-sim//-m3/
> sh-sim//-m3e/
> sh-sim//-m4/
> sh-sim//-m4-single/
> sh-sim//-m4-single-only/
> sh-sim//-m4a/
> sh-sim//-m4a-single/
> sh-sim//-m4a-single-only/
>
> *[-mb,-ml]
>
> No performance regression for -m4
The patch is OK.
It seems that your patch does the right thing, though I don't
know the history of DF_HI_REGS at all.
> The consequence of this it that find_costs_and_classes seems to be
> confused when two register classes are strictly equivalent. Is it
> plausible ?
Looks very likely to me.
Regards,
kaz
