Robin Morisset 79826e015e 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 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218455 91177308-0d34-0410-b5e6-96231b3b80d8		2014-09-25 17:27:43 +00:00
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Analysis	Fix assertion in LICM doFinalization()	2014-09-24 16:48:31 +00:00
AsmParser	Make CallingConv::ID an alias of "unsigned".	2014-09-10 18:00:17 +00:00
Bitcode	Do not destroy external linkage when deleting function body	2014-09-23 12:54:19 +00:00
CodeGen	Lower idempotent RMWs to fence+load	2014-09-25 17:27:43 +00:00
DebugInfo	Revert 218406 - Refactor the RelocVisitor::visit method	2014-09-24 21:30:43 +00:00
ExecutionEngine	[MCJIT] Fix some more RuntimeDyld debugging output format specifiers.	2014-09-23 19:20:57 +00:00
IR	DIBuilder: Delete dead code, NFC	2014-09-19 23:17:58 +00:00
IRReader
LineEditor
Linker	Merge alignment of common GlobalValue.	2014-09-09 17:48:18 +00:00
LTO	LTO: introduce object file-based on-disk module format.	2014-09-18 21:28:49 +00:00
MC	MC: Use @IMGREL instead of @IMGREL32, which we can't parse	2014-09-25 02:09:18 +00:00
Object	Converting object's error_category to a ManagedStatic to avoid static constructors and destructors.	2014-09-19 22:09:18 +00:00
Option	Add an overload of getLastArgNoClaim taking two OptSpecifiers.	2014-09-12 19:42:53 +00:00
ProfileData	llvm-cov: Combine segments that cover the same location	2014-09-25 00:34:18 +00:00
Support	Adding #ifdef around TermColorMutex based on feedback from Craig Topper.	2014-09-24 18:35:58 +00:00
TableGen	[TableGen] Fully resolve class-instance values before defs in multiclasses	2014-09-16 17:14:13 +00:00
Target	Lower idempotent RMWs to fence+load	2014-09-25 17:27:43 +00:00
Transforms	[asan] don't instrument module CTORs that may be run before asan.module_ctor. This fixes asan running together -coverage	2014-09-24 22:41:55 +00:00
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