[PATCH] D30728: CodeGen: Placement: Apply triangle heuristic more aggressively at O3.

[Kyle Butt via Phabricator via llvm-commits]

iteratee added a comment.

In https://reviews.llvm.org/D30728#701847, @davidxl wrote:

> Should the mips problem be fixed? I don't see a fundamental reason this needs to be opt level specific.


We looked into the mips issue. It is only a problem on mips2 and mips3, which are now 25 years old. The lowering for those targets could be better, but I'll file a bug and let it be.

The issue also goes away with branch coalescing if the mips branch targets are correctly marked as not clobbering the AT register.


Repository:
  rL LLVM

https://reviews.llvm.org/D30728