David Rubin 083b7b483e riscv: zero registers when using register-wide operations ...

what was happening is that instructions like `lb` were only affecting the lower bytes of the register and leaving the top dirty. this would lead to situtations were `cmp_eq` for example was using `xor`, which was failing because of the left-over stuff in the top of the register.

with this commit, we now zero out or truncate depending on the context, to ensure instructions like xor will provide proper results.

2024-06-13 02:22:04 -07:00

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