aarch64: Migrate bitrev/clz/cls/ctz to ISLE#3658
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This commit migrates these existing instructions to ISLE from the manual
lowerings implemented today. This was mostly straightforward but while I
was at it I fixed what appeared to be broken translations for I{8,16}
for `clz`, `cls`, and `ctz`. Previously the lowerings would produce
results as-if the input was 32-bits, but now I believe they all
correctly account for the bit-width.
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LGTM, and thanks for the fixes to clz/ctz with narrow values!
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This commit migrates these existing instructions to ISLE from the manual
lowerings implemented today. This was mostly straightforward but while I
was at it I fixed what appeared to be broken translations for I{8,16}
for
clz,cls, andctz. Previously the lowerings would produceresults as-if the input was 32-bits, but now I believe they all
correctly account for the bit-width.