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Quentin Colombet 96f54de8ff [InstCombine] Optimize `atomicrmw <op>, 0` into `load atomic` when possible 
This commit teaches InstCombine how to replace an atomicrmw operation
into a simple load atomic.
For a given `atomicrmw <op>`, this is possible when:
1. The ordering of that operation is compatible with a load (i.e.,
   anything that doesn't have a release semantic).
2. <op> does not modify the value being stored

Differential Revision: https://reviews.llvm.org/D57854

llvm-svn: 353471
 		2019-02-07 21:27:23 +00:00
..
AggressiveInstCombine Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
Coroutines [opaque pointer types] Pass value type to LoadInst creation. 2019-02-01 20:44:24 +00:00
Hello Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
IPO [HotColdSplit] With PGO add profile entry metadata to split cold function 2019-02-07 17:50:35 +00:00
InstCombine [InstCombine] Optimize `atomicrmw <op>, 0` into `load atomic` when possible 2019-02-07 21:27:23 +00:00
Instrumentation [InstrProf] Avoid reconstructing Triple, NFC 2019-02-07 18:16:22 +00:00
ObjCARC [opaque pointer types] Pass function type for CallBase::setCalledFunction. 2019-02-01 20:44:54 +00:00
Scalar [LSR] Generate cross iteration indexes 2019-02-07 13:32:54 +00:00
Utils [LICM/MSSA] Add promotion to scalars by building an AliasSetTracker with MemorySSA. 2019-02-06 20:25:17 +00:00
Vectorize [LV] Remove unnecessary assignment to UserIC. 2019-02-07 21:23:37 +00:00
CMakeLists.txt Another try to commit 323321 (aggressive instruction combine). 2018-01-25 12:06:32 +00:00
LLVMBuild.txt Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00