[llvm-dev] Proposal: On re-purposing/reorganizing MIR sigils ('&', '$', '%').

[Sean Silva via llvm-dev]

Can we use %% for vregs? Seems slightly easier to remember %/%% than $/%.
Also, %eax and $some_symbol are already familiar from typical assembly
syntax and we probably don't want to break that association.

It's all a bikeshed, but being more consistent with assembly is probably a
win.

-- Sean Silva

On Dec 25, 2017 11:31 AM, "Puyan Lotfi via llvm-dev" <
llvm-dev at lists.llvm.org> wrote:

> Hi
>
> A few of us have discussed enhancing the MIR vregs to include support for
> named-vregs. At the moment named regs are only supported for physical
> registers and number regs are reserved for vregs.
>
> We've decided that to properly implement a syntax for MIR named vregs we
> first need to reorganized the sigils used for physical registers and
> external symbols so our proposal is to swap the sigil used for external
> symbols ('$') for the ampersand ('&') and re-purpose dollar-sign for
> physregs so that physregs have the dollar-sign sigil and vregs have the
> percentage ('%') sigil:
>
> essentially:
>
> BL *&*__divsi3 ...
>
> ...
>
> $eax = ...
>
> %123 = ...
>
> %vregFooBar = ...
>
>
> I have an initial patch attached (replaces '$' for '&' for external
> symbols). Hoping to open some dialog with the community before doing more
> implementation work.
>
> Thanks
>
> PL
>
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