Robin Morisset 98b0bed638 Lower idempotent RMWs to fence+load ... Summary: I originally tried doing this specifically for X86 in the backend in D5091, but it was rather brittle and generally running too late to be general. Furthermore, other targets may want to implement similar optimizations. So I reimplemented it at the IR-level, fitting it into AtomicExpandPass as it interacts with that pass (which could not be cleanly done before at the backend level). This optimization relies on a new target hook, which is only used by X86 for now, as the correctness of the optimization on other targets remains an open question. If it is found correct on other targets, it should be trivial to enable for them. Details of the optimization are discussed in D5091. Test Plan: make check-all + a new test Reviewers: jfb Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D5422 llvm-svn: 218455		2014-09-25 17:27:43 +00:00
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CostTable.h
Target.td	Add isInsertSubreg property.	2014-08-20 23:49:36 +00:00
TargetCallingConv.h	ARM: HFAs must be passed in consecutive registers	2014-05-09 14:01:47 +00:00
TargetCallingConv.td	[mips] Add CCValAssign::[ASZ]ExtUpper and CCPromoteToUpperBitsInType and handle struct's correctly on big-endian N32/N64 return values.	2014-09-25 12:15:05 +00:00
TargetFrameLowering.h	Re-apply r211399, "Generate native unwind info on Win64" with a fix to ignore SEH pseudo ops in X86 JIT emitter.	2014-06-25 12:41:52 +00:00
TargetInstrInfo.h	Fix a lot of confusion around inserting nops on empty functions.	2014-09-15 18:32:58 +00:00
TargetIntrinsicInfo.h	Trailing whitespace.	2014-07-23 00:42:52 +00:00
TargetItinerary.td
TargetLibraryInfo.h	Trailing whitespace.	2014-07-23 00:42:52 +00:00
TargetLowering.h	Lower idempotent RMWs to fence+load	2014-09-25 17:27:43 +00:00
TargetLoweringObjectFile.h	CodeGen: Stick constant pool entries in COMDAT sections for WinCOFF	2014-07-14 22:57:27 +00:00
TargetMachine.h	Add a new pass FunctionTargetTransformInfo. This pass serves as a	2014-09-18 00:34:14 +00:00
TargetOpcodes.h	[stack protector] Fix a potential security bug in stack protector where the	2014-07-25 19:31:34 +00:00
TargetOptions.h	Satiate the sanitizer build bot	2014-08-21 20:09:15 +00:00
TargetRegisterInfo.h	[RegisterCoalescer] Moving the RegisterCoalescer subtarget hook onto the TargetRegisterInfo instead of the TargetSubtargetInfo.	2014-07-16 20:13:31 +00:00
TargetSchedule.td	Move Post RA Scheduling flag bit into SchedMachineModel	2014-07-15 22:39:58 +00:00
TargetSelectionDAG.td	Fix typos	2014-07-17 17:50:22 +00:00
TargetSelectionDAGInfo.h	Trailing whitespace.	2014-07-23 00:42:52 +00:00
TargetSubtargetInfo.h	Remove resetSubtargetFeatures as it is unused.	2014-09-03 20:36:31 +00:00