John Brawn ad45eb4a9c [ARM] Fix problems with register list in vscclrm (#111825) ...

The register list in vscclrm is unusual in three ways:
 * The encoded size can be zero, meaning the list contains only vpr.
* Double-precision registers past d15 are permitted even when the
subtarget doesn't have them, they are instead ignored when the
instruction executes.
* The single-precision variant allows double-precision registers d16
onwards, which are encoded as a pair of single-precision registers.

Fixing this also incidentally changes a vlldm/vlstm error message: when
the first register is in the range d16-d31 we now get the "operand must
be exactly..." error instead of "register expected".

2024-10-17 11:15:08 +01:00

58 KiB

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