Evgeniy Stepanov 4031b194ac [msan] Do not store origin for clean values. ... Instead of unconditionally storing origin with every application store, only do this when the shadow of the stored value is != 0. This change also delays instrumentation of stores until after the walk over function's instructions, because adding new basic blocks confuses InstVisitor. We only keep 1 origin value per 4 bytes of application memory. This change fixes the bug when a store of a single clean byte wiped the origin for the whole 4-byte area. Since stores of uninitialized values are relatively uncommon, this change improves performance of track-origins mode by 5% median and by up to 47% on specs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169490 91177308-0d34-0410-b5e6-96231b3b80d8		2012-12-06 11:41:03 +00:00
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AddressSanitizer	ASan: add initial support for handling llvm.lifetime intrinsics in ASan - emit calls into runtime library that poison memory for local variables when their lifetime is over and unpoison memory when their lifetime begins.	2012-12-04 01:34:23 +00:00
BoundsChecking	revert r160742: it's breaking CMake build	2012-07-25 18:49:28 +00:00
MemorySanitizer	[msan] Do not store origin for clean values.	2012-12-06 11:41:03 +00:00
ThreadSanitizer	tsan: instrument atomic nand operation	2012-11-27 08:09:25 +00:00