Hello, [email protected] writes:
> I'm interested in the ability to restrict V8 from generating > particular instructions use of input/output registers to an > [artificial] subset of available allocatable registers, and I was > curious if the constraint system has this ability? I don't think the constraint system itself has this ability but you should be able to do this as part of the CallDescriptor associated with the function you're compiling by giving it a set of restricted registers to work with: https://cs.chromium.org/chromium/src/v8/src/compiler/linkage.h?rcl=6fa327e3816b12f7efe1a3fd600c0fff72e8cb8a&l=356 So if you want to change the available registers for all JS function for instance, you could probably change the JS call descriptor here: https://cs.chromium.org/chromium/src/v8/src/compiler/linkage.cc?rcl=6fa327e3816b12f7efe1a3fd600c0fff72e8cb8a&l=347 As an example, we restrict registers for the RecordWrite builtin, as this builtin can be called "out-of-line" from generated code, and we don't know which registers are live at this level: https://cs.chromium.org/chromium/src/v8/src/compiler/backend/arm64/code-generator-arm64.cc?l=908&rcl=6fa327e3816b12f7efe1a3fd600c0fff72e8cb8a Hope this helps! Thanks, Pierre -- -- v8-dev mailing list [email protected] http://groups.google.com/group/v8-dev --- You received this message because you are subscribed to the Google Groups "v8-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/v8-dev/878soik8ot.fsf%40arm.com.
