tree d55cc0c08e572175c25da9206fe35702d0b037f6
parent 9838c8512bc29e3a1b8edeb0eb2541160e4c727f
author Craig Topper <craig.topper@sifive.com> 1707803015 -0800
committer Craig Topper <craig.topper@sifive.com> 1707847068 -0800

[RISCV] Enable the TypePromotion pass from AArch64/ARM.

This pass looks for unsigned icmps that have illegal types and tries
to widen the use/def graph to improve the placement of the zero
extends that type legalization would need to insert.

I've explicitly disabled it for i32 by adding a check for
isSExtCheaperThanZExt to the pass.

The generated code isn't perfect, but my data shows a net
dynamic instruction count improvement on spec2017 for both base and
Zba+Zbb+Zbs.