Csanád Hajdú 72901fe19e [AArch64] Fold UBFMXri to UBFMWri when it's an LSR or LSL alias (#106968) ...

Using the LSR or LSL aliases of UBFM can be faster on some CPUs, so it
is worth changing 64 bit UBFM instructions, that are equivalent to 32
bit LSR/LSL operations, to 32 bit variants.

This change folds the following patterns:
* If `Imms == 31` and `Immr <= Imms`:
   `UBFMXri %0, Immr, Imms`  ->  `UBFMWri %0.sub_32, Immr, Imms`
* If `Immr == Imms + 33`:
   `UBFMXri %0, Immr, Imms`  ->  `UBFMWri %0.sub_32, Immr - 32, Imms`

2024-09-17 11:21:23 +01:00

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