[PATCH] D19087: [x86, ppc] prefer comparisons against zero for and+cmp sequences

[Sanjay Patel via llvm-commits]

spatel added a comment.

In http://reviews.llvm.org/D19087#401557, @hfinkel wrote:

> Not sure why PPC would take more work than x86 (both backends currently use the MachineCombiner for other purposes). Regardless, I'd not jump here unless necessary.


In the test cases, PPC is branching, so I figure there'd be more complexity undoing that than the simple instruction replacement/deletion that x86 needs. But I agree, I don't want to sink that far down if I don't have to.


http://reviews.llvm.org/D19087