Chandler Carruth e1a5243053 Fix a really nasty SROA bug with how we handled out-of-bounds memcpy ... intrinsics. Reported on the list by Evan with a couple of attempts to fix, but it took a while to dig down to the root cause. There are two overlapping bugs here, both centering around the circumstance of discovering a memcpy operand which is known to be completely outside the bounds of the alloca. First, we need to kill the *other* side of the memcpy if it was added to this alloca. Otherwise we'll factor it into our slicing and try to rewrite it even though we know for a fact that it is dead. This is made more tricky because we can visit the sides in either order. So we have to both kill the other side and skip instructions marked as dead. The latter really should be goodness in every case, but here is a matter of correctness. Second, we need to actually remove the *uses* of the alloca by the memcpy when queuing it for later deletion. Otherwise it may still be using the alloca when we go to promote it (if the rewrite re-uses the existing alloca instruction). Do this by factoring out the use-clobbering used when for nixing a Phi argument and re-using it across the operands of a to-be-deleted instruction. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199590 91177308-0d34-0410-b5e6-96231b3b80d8		2014-01-19 12:16:54 +00:00
..
ADCE.cpp
CMakeLists.txt	Add a Scalarizer pass.	2013-11-22 16:58:05 +00:00
CodeGenPrepare.cpp	[opt][PassInfo] Allow opt to run passes that need target machine.	2014-01-16 21:44:34 +00:00
ConstantProp.cpp
CorrelatedValuePropagation.cpp
DCE.cpp
DeadStoreElimination.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
EarlyCSE.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
FlattenCFGPass.cpp	Factor FlattenCFG out from SimplifyCFG	2013-08-06 02:43:45 +00:00
GlobalMerge.cpp	Change tabs to spaces.	2013-07-22 21:11:30 +00:00
GVN.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
IndVarSimplify.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
JumpThreading.cpp	Don't eliminate a partially redundant load if it's in a landing pad.	2013-10-21 04:09:17 +00:00
LICM.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
LLVMBuild.txt	Add proper dependencies to LLVMBuild.txt in llvm/lib.	2013-12-10 05:39:34 +00:00
LoopDeletion.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
LoopIdiomRecognize.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
LoopInstSimplify.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
LoopRerollPass.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
LoopRotation.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
LoopStrengthReduce.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
LoopUnrollPass.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
LoopUnswitch.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
LowerAtomic.cpp
Makefile
MemCpyOptimizer.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
PartiallyInlineLibCalls.cpp	Turn MipsOptimizeMathLibCalls into a target-independent scalar transform	2013-08-23 10:27:02 +00:00
Reassociate.cpp	Put the functionality for printing a value to a raw_ostream as an	2014-01-09 02:29:41 +00:00
Reg2Mem.cpp
SampleProfile.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
Scalar.cpp	[cleanup] Move the Dominators.h and Verifier.h headers into the IR	2014-01-13 09:26:24 +00:00
Scalarizer.cpp	Fix Scalarizer insertion point when replacing PHIs with insertelements	2013-12-23 14:51:56 +00:00
ScalarReplAggregates.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
SCCP.cpp	Use SmallVectorImpl& instead of SmallVector to avoid repeating small vector size.	2013-07-14 04:42:23 +00:00
SimplifyCFGPass.cpp	Reapply r188119 now that the bug it exposed is fixed.	2013-08-12 22:38:43 +00:00
Sink.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
SROA.cpp	Fix a really nasty SROA bug with how we handled out-of-bounds memcpy	2014-01-19 12:16:54 +00:00
StructurizeCFG.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
TailRecursionElimination.cpp	TRE: Move class into anonymous namespace.	2013-07-24 16:12:08 +00:00