Hi,
I have recently started work on building a VM for Lua (actually a
derivative of Lua) in X86-64 assembly. I am using the dynasm tool
that is part of LuaJIT. I was wondering whether I could also
write this in D's inline assembly perhaps, but there is one
aspect that I am not sure how to do.
The assembly code uses static allocation of registers, but
because of the differences in how registers are used in Win64
versus Unix X64 - different registers are assigned depending on
the architecture. dynasm makes this easy to do using macros; e.g.
below.
|.if X64WIN
|.define CARG1, rcx // x64/WIN64 C call arguments.
|.define CARG2, rdx
|.define CARG3, r8
|.define CARG4, r9
|.else
|.define CARG1, rdi // x64/POSIX C call arguments.
|.define CARG2, rsi
|.define CARG3, rdx
|.define CARG4, rcx
|.endif
With above in place, the code can use the mnemonics to refer to
the registers rather than the registers themselves. This allows
the assembly code to be coded once for both architectures.
How would one do this in D inline assembly?
Thanks and Regards
Dibyendu
