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357 Commits

Author SHA1 Message Date
Evgeniy Stepanov 857d9d2a59 [msan] Propagate shadow through (x<0) and (x>=0) comparisons. 
This is a special case of signed relational comparison where result
only depends on the sign of x.

llvm-svn: 168881
 2012-11-29 14:25:47 +00:00
Evgeniy Stepanov eeb8b7c391 [msan] Fix shadow & origin store & load alignment. 
This change ensures that shadow memory accesses have the same alignment
as corresponding app memory accesses.

llvm-svn: 168880
 2012-11-29 14:05:53 +00:00
Evgeniy Stepanov 62ba611828 [msan] Optimize getOriginPtr. 
Rewrite getOriginPtr in a way that lets subsequent optimizations factor out
the common part of Shadow and Origin address calculation. Improves perf by
up to 5%.

llvm-svn: 168879
 2012-11-29 13:43:05 +00:00
Evgeniy Stepanov da0072b676 [msan] Fix a few compilation warnings. 
llvm-svn: 168878
 2012-11-29 13:12:03 +00:00
Evgeniy Stepanov 62b5db9361 [msan] Transform memcpy and memset to library calls. 
This was already done for memmove, where it is required for correctness.
This change improves performance by avoiding copyingthe same memory twice.
Also, the library functions are given __msan_ prefix to prevent instcombine
pass from converting them back to intrinsics.

llvm-svn: 168876
 2012-11-29 12:49:04 +00:00
Evgeniy Stepanov 1d2da65bf8 [msan] Make sure that report callbacks do not get merged. 
llvm-svn: 168873
 2012-11-29 12:30:18 +00:00
Evgeniy Stepanov d4bd7b73e3 Initial commit of MemorySanitizer. 
Compiler pass only.

llvm-svn: 168866
 2012-11-29 09:57:20 +00:00