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Compiler implementation of the D programming language.
ubyte modregrm(uint m, uint r, uint rm);
Macros to ease generating code modregrm: generate mod reg r/m field modregxrm: reg could be R8..R15 modregrmx: rm could be R8..R15 modregxrmx: reg or rm could be R8..R15

NEWREG change reg field of x to r genorreg: OR t,f