Stream: git-cranelift

Topic: cranelift / Issue #597 Optimize `stack_store` and `stack_...

GitHub (Feb 28 2020 at 23:25):

alexcrichton transferred Issue #597:

Currently, stack_store and stack_load are legalized into stack_addr followed by plain store and load, producing code like this:

    lea rax, qword ptr [rsp + 8]
        mov qword ptr [rax], rdi

We really want to just emit this:

        mov qword ptr [rsp + 8], rdi

Options include:

• Add encoding rules for stack_load and stack_store, making them legal. This is straightforward, but if we later want to extend this to allow extending loads and narrowing stores, we'll need a bunch more instructions.
• Extend load_complex/store_complex to have a way represent a base pointer which is the stack pointer, and then fold stack_addr into load/store.

Last updated: Nov 22 2024 at 16:03 UTC