Pierre van Houtryve ed299b3efd [GlobalISel] Optimize ULEB128 usage (#90565) ...

- Remove some cases where ULEB128 isn't needed
- Add a fastDecodeULEB128 tailored for GlobalISel which does unchecked
decoding optimized for the common case, which is 1 byte values. We
rarely have >1 byte Inst IDs, OpIdx, etc. and those are the most common
ULEB users by far.

This specific LEB128 decode function generates almost 2x less
instructions than the generic one.

2024-05-03 10:26:54 +02:00

2.2 KiB

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