[PATCH] D124308: [MachineScheduler] exclude INLINEASM from schedule when it would increase register pressure

[Phoebe Wang via Phabricator via llvm-commits]

pengfei added a comment.

My understanding is the inline asm is in the transition zone between a "regular instruction" and "function call", because the content of inline asm is vary largely. It can be as simple as a "nop" or more complicated as modifing memory or even call a function.
I think setting scheduling barrier based on register pressure is compromised solution. It's also much like we prepare/preserve registers for function call when we use many registers in inline asm.
One more thought, we may also need to consider the clobber registers and memory?


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https://reviews.llvm.org/D124308