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| author | Andrew Trick <atrick@apple.com> | 2012-02-10 04:10:36 +0000 |
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| committer | Andrew Trick <atrick@apple.com> | 2012-02-10 04:10:36 +0000 |
| commit | 8dd26253f54247e77e5accfdd70e7b4bf27b39c2 (patch) | |
| tree | df14b7b3cec3b603bc5feb7070a05f00eb83d4a5 /docs/HowToReleaseLLVM.html | |
| parent | 16f72dd68653bd4984363483cfc15ce91fa613d4 (diff) | |
| download | external_llvm-8dd26253f54247e77e5accfdd70e7b4bf27b39c2.zip external_llvm-8dd26253f54247e77e5accfdd70e7b4bf27b39c2.tar.gz external_llvm-8dd26253f54247e77e5accfdd70e7b4bf27b39c2.tar.bz2 | |
RegAlloc superpass: includes phi elimination, coalescing, and scheduling.
Creates a configurable regalloc pipeline.
Ensure specific llc options do what they say and nothing more: -reglloc=... has no effect other than selecting the allocator pass itself. This patch introduces a new umbrella flag, "-optimize-regalloc", to enable/disable the optimizing regalloc "superpass". This allows for example testing coalscing and scheduling under -O0 or vice-versa.
When a CodeGen pass requires the MachineFunction to have a particular property, we need to explicitly define that property so it can be directly queried rather than naming a specific Pass. For example, to check for SSA, use MRI->isSSA, not addRequired<PHIElimination>.
CodeGen transformation passes are never "required" as an analysis
ProcessImplicitDefs does not require LiveVariables.
We have a plan to massively simplify some of the early passes within the regalloc superpass.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150226 91177308-0d34-0410-b5e6-96231b3b80d8
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