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Re: [PATCH 09/11] pdp11 - example of a port not needing a speculation barrier
> On Jul 27, 2018, at 5:37 AM, Richard Earnshaw <Richard.Earnshaw@arm.com> wrote:
>
>
> This patch is intended as an example of all that is needed if the
> target system doesn't support CPUs that have speculative execution.
> I've chosen the pdp11 port on the basis that it's old enough that this
> is likely to be true for all existing implementations and that there
> is also little chance of that changing in future!
>
> * config/pdp11/pdp11.c (TARGET_HAVE_SPECULATION_SAFE_VALUE): Redefine
> to speculation_safe_value_not_needed.
> ---
> gcc/config/pdp11/pdp11.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> <0009-pdp11-example-of-a-port-not-needing-a-speculation-ba.patch>
Correct, no speculative instruction now, and I don't think any of the people constructing PDP11s (yes there are some) are going to be adding it.
Thanks Richard.
paul