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106.327
2018 Aug 15
2
[RFC] Delaying phi-to-select transformation until later in the pass pipeline
I'm concerned that we're focusing on one side of this. Let me point out
a few concerns w/changing the canonical form here:
1. LICM does not know how to hoist or sink regions. It does know how
to hoist and sink selects.
2. InstCombine has limited support for triangles/diamonds, but fairly
extensive support for selects.
3. EarlyCSE and GVN do not know how to eliminate fully