wazevo: adds bit count instructions clz, ctz #1635
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Signed-off-by: Edoardo Vacchi <[email protected]>
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Although I am not sure about its correctness, this PR may be a good starting point if you haven't dug into wazevo yet since it is really tiny @ncruces |
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Next time let's add reference to issue #1496 in the PR description |
Signed-off-by: Edoardo Vacchi <[email protected]>
evacchi
changed the title
Signed-off-by: Edoardo Vacchi <[email protected]>
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Continues #1496.
This introduces the front-end and back-end for clz, ctz (in terms of rbit+clz).
It originally also introduced popcnt for the front-end, but this requires
VCNT in the backend, which is probably worth its own separate PR.
Contextually, this also introduces a partial implementation for bitRR.
First PR to wazevo, so I am not entirely sure that the generated
code for the SSA and the backend is correct, let me know if there are errors,
I am really figuring out a lot of stuff, including the framework :)
Signed-off-by: Edoardo Vacchi [email protected]