On 4/9/23 21:11, Kito Cheng wrote:
I think one keypoint here is -fzero-call-used-regs=* emit zeroing
instruction before return, that means there won't be any vector
operations between return and zeroing instructions, so we don't need
to restore the vcsr after zeroing.
Oh yea, makes perfect
> > Do you need to save/restore the vector configuration before and after
> > clearing the vector registers?If so, that seems to be missing. If
> > not, it seems like a comment explaining why would be useful.
>
> I'll add some comments in the code and want to explain here first.
> We need not
Thanks Jeff's comment.
> Presumably the difficulty here is we need to find a suitable hard
> register so that we can emit the vsetvl.
Yes. We use the GPR which has been flagged in the need_zeroed_regs to
hold the vl. There should be one GPR we can use, otherwise, will throw
an exception.
> Do
On 4/7/23 06:32, yanzhang.wang--- via Gcc-patches wrote:
From: Yanzhang Wang
This patch registers a riscv specific function to
TARGET_ZERO_CALL_USED_REGS instead of default in targhooks.cc. It will
clean gpr and vector relevant registers.
PR 109104
gcc/ChangeLog:
* config/
From: Yanzhang Wang
This patch registers a riscv specific function to
TARGET_ZERO_CALL_USED_REGS instead of default in targhooks.cc. It will
clean gpr and vector relevant registers.
PR 109104
gcc/ChangeLog:
* config/riscv/riscv-protos.h (emit_hard_vlmax_vsetvl):
* confi
