Add RVC GPR Pair Constraint - cR
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This follows the notion of using `c` as a prefix to mean "RVC-compatible", and `R` to mean "GPR Pair". The Zclsd specification adds registers with this constraint, in particular the `c.ld` and `c.sd` instructions need it.
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This denotes RVC-compatible GPR Pairs, which are used by the Zclsd extension. C API PR: riscv-non-isa/riscv-c-api-doc#102
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This denotes RVC-compatible GPR Pairs, which are used by the Zclsd extension. C API PR: riscv-non-isa/riscv-c-api-doc#102
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This denotes RVC-compatible GPR Pairs, which are used by the Zclsd extension. C API PR: riscv-non-isa/riscv-c-api-doc#102
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This follows the notion of using
cas a prefix to mean "RVC-compatible", andRto mean "even-odd GPR Pair".The Zclsd specification adds registers with this constraint, in particular the
c.ldandc.sdinstructions need it.