First integer register number. zero register.

return address register

return address register

Last integer register number. Used as TMP (IP) register.

Last integer register number. Used as TMP (IP) register.

Last integer register number. Used as TMP (IP) register.

First floating point register.

First floating point register.

Last floating point register.

Not to be confused with the CmmReg spReg

All machine register numbers.

Registers available to the register allocator.

These are all registers minus those with a fixed role in RISCV ABI (zero, lr, sp, gp, tp, fp, tmp) and GHC RTS (Base, Sp, Hp, HpLim, R1..R8, F1..F6, D1..D6.)

Integer argument registers according to the calling convention

Floating point argument registers according to the calling convention

Addressing modes

Map CmmLit to Imm

N.B. this is a partial function, because not all CmmLits have an immediate representation.

regSqueeze_class reg Calculate the maximum number of register colors that could be denied to a node of this class due to having this reg as a neighbour.