On Mon, Nov 16, 2020 at 2:45 PM Philipp Tomsich
wrote:
> This is an de-optimization only, if applied without patch 1 from the
> series: the change to VRP ensures that the backend will never see a shift
> wider than the immediate field.
> The problem is that if a negative shift-amount makes it to
Jim,
On Mon, 16 Nov 2020 at 23:28, Jim Wilson wrote:
>
> On Mon, Nov 16, 2020 at 10:57 AM Philipp Tomsich
wrote:
>>
>> In case a negative shift operand makes it through into the backend,
>> it will be treated as unsigned and truncated (using a mask) to fit
>> into the range 0..31 (for SImode) an
On Mon, Nov 16, 2020 at 10:57 AM Philipp Tomsich
wrote:
> In case a negative shift operand makes it through into the backend,
> it will be treated as unsigned and truncated (using a mask) to fit
> into the range 0..31 (for SImode) and 0..63 (for DImode).
>
This is a de-optimization. This doesn'
