[llvm] [RISCV] Add a command line option to disable cost per use for compressed registers. (PR #83320)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

@topperc Could you please provide some performance data with the flag enabled?
Looks like enabling the flag leads to ~16% execution time regression and ~20% code size regression.


https://github.com/llvm/llvm-project/pull/83320