Craig Topper 59728193a6 [RISCV] Disable fixed length vectors with Zve32* without Zvl64b. (#102405) ...

Fixed length vectors use scalable vector containers. With Zve32* and not
Zvl64b, vscale is a 0.5 due RVVBitsPerBlock being 64.

To support this correctly we need to lower RVVBitsPerBlock to 32 and
change our type mapping. But we need to RVVBitsPerBlock to alway be
>= ELEN.  This means we need two different mapping depending on ELEN.

That is a non-trivial amount of work so disable fixed lenght vectors
without Zvl64b for now.

We had almost no tests for Zve32x without Zvl64b which is probably why
we never realized that it was broken.

Fixes #102352.

2024-08-08 09:17:43 -07:00

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