[vectorIntrinsics] RFR: 8274631: assert(false) failed: bad AD file with -XX:UseKNLSetting

[Jatin Bhateja]

On Fri, 1 Oct 2021 16:45:37 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

>> - Fix for assertion failure in test/hotspot/jtreg/compiler/vectorapi/VectorMaskCastTest.java crashes during compilation over KNL target.
>> - A safety check has been added to prevent intrinsification of VectorMask.cast API if source and destination have incompatible ideal types i.e one is predicate vector type (TypeVectMask) and other a vector type (TypeVect).
>
> src/hotspot/share/opto/vectorIntrinsics.cpp line 2416:
> 
>> 2414:       ((src_type->isa_vect() && dst_type->isa_vectmask()) ||
>> 2415:       (dst_type->isa_vect() && src_type->isa_vectmask()))) {
>> 2416:     return false;
> 
> Should we add `if (C->print_intrinsics()) { ... }` in this case?

Intrinsification is prevented due to an internal implementation constraint of compiler, I think it will not provide any useful information to user in this case.

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PR: https://git.openjdk.java.net/panama-vector/pull/141