[llvm-dev] Some questions about writing compiler passes.

[Carter Cheng via llvm-dev]

Thanks. I will take a look.

On Tue, Nov 6, 2018 at 2:06 AM Matthias Braun <mbraun at apple.com> wrote:

>
>
> > On Nov 4, 2018, at 8:13 AM, Carter Cheng via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
> >
> > Thanks for the help. I have a couple follow up questions-
> >
> > Where can I find the code which calculates the properties of inline asm
> nodes and examples of passes that make use of this information?
>
> Generally the compiler does not calculate properties of inline asm. A good
> mental model is that inline assembly is just a string to the compiler where
> we just perform some replacements for register names and similar.
> Properties and constraints are expected to be specified by the user (you
> have to mark it volatile if it has side effects, you have to specify lists
> of registers to be clobbered, you have to specify register allocation
> constraints via letters, etc. see the gcc documentation for what is
> possible).
>
> - Matthias
>
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