Dan Gohman 442bfcec00 [WebAssembly] Switch from RPO sorting to topological sorting. ...

WebAssembly doesn't require full RPO; topological sorting is sufficient and
can preserve more of the MachineBlockPlacement ordering. Unfortunately, this
still depends a lot on heuristics, because while we use the
MachineBlockPlacement ordering as a guide, we can't use it in places where
it isn't topologically ordered. This area will require further attention.

llvm-svn: 260978

2016-02-16 16:22:41 +00:00

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