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this allows it to detect 32b binaries
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instructions
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in rv32 these will be replaced with loads and stores.
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kernel would erroneously trap on FP disabled
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- Added 5th rounding mode
- Removed MFCR/MTCR in favor of MFFSR/MTFSR (it was the only CR...)
- merged MTF.D with MTFLH.D; operation depends on RV32/RV64 mode
- made MFFL.D and MFFH.D illegal in RV64
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