eopXD marked an inline comment as not done.
eopXD added inline comments.
================
Comment at: clang/lib/Basic/Targets/RISCV.cpp:184
Builder.defineMacro("__riscv_v_min_vlen", Twine(MinVLen));
+ Builder.defineMacro("__riscv_v_max_eew", Twine(MaxEew));
+ Builder.defineMacro("__riscv_v_max_eew_fp", Twine(MaxEewFp));
----------------
craig.topper wrote:
> eopXD wrote:
> > craig.topper wrote:
> > > khchen wrote:
> > > > craig.topper wrote:
> > > > > Would't ELEN be the correct term here? Not EEW.
> > > > https://github.com/riscv/riscv-v-spec/blob/master/v-spec.adoc#182-zve-vector-extensions-for-embedded-processors
> > > > shows zve* extensions have `Supported EEW`, I guess it's why the term
> > > > is `EEW`.
> > > >
> > > >
> > > Is that because that section talks about them as a set of values rather
> > > than a single maximum?
> > I think Zve is restricting the EEW, not ELEN.
> The spec defines ELEN as "The maximum size in bits of a vector element that
> any operation can produce or consume" That sounds like maximum EEW to me.
>
> This statement appears in section 3.4.2
>
> "For standard vector extensions with
> ELEN=32, fractional LMULs of 1/2 and 1/4 must be supported. For standard
> vector extensions with ELEN=64, fractional
> LMULs of 1/2, 1/4, and 1/8 must be supported."
>
> I take "standard vector extensions with ELEN=32" to mean Zve32x, Zve32f.
>
> And "standard vector extensions with ELEN=64" to mean Zve64x, Zve64f, Zve64d,
> and V.
>
> Am I interpreting that incorrectly?
Yes I think you are correct. Maximum EEW is an alias of ELEN.
I see that the discussion in
https://github.com/riscv-non-isa/riscv-c-api-doc/pull/21 hasn't conclude on
whether changing the name into `elen` and `elen_fp`.
Should this patch pend until conclusions are drawn?
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D112408/new/
https://reviews.llvm.org/D112408
_______________________________________________
cfe-commits mailing list
cfe-commits@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
