[llvm-branch-commits] [llvm] [AMDGPU] Use reverse iteration in CodeGenPrepare (PR #145484)

[Jay Foad via llvm-branch-commits]

jayfoad wrote:

I don't understand the high level motivation here. "Normal" combining/simplification order is to visit the operands of an instruction before you visit the instruction itself. That way the "visit" function can assume that the operands have already been simplified. GlobalISel combines already work this way, and a lot of effort has been put into trying to make the SelectionDAG combiner work this way too.

https://github.com/llvm/llvm-project/pull/145484