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Author SHA1 Message Date
Bob Wilson 1b8453067b Preserve load alignment in instcombine transformations. I've been unable to 
create a testcase where this matters.  The select+load transformation only
occurs when isSafeToLoadUnconditionally is true, and in those situations,
instcombine also changes the underlying objects to be aligned.  This seems
like a good idea regardless, and I've verified that it doesn't pessimize
the subsequent realignment.

llvm-svn: 94850
 2010-01-29 22:39:21 +00:00
Bob Wilson 7c42b9d51e Improve isSafeToLoadUnconditionally to recognize that GEPs with constant 
indices are safe if the result is known to be within the bounds of the
underlying object.

llvm-svn: 94829
 2010-01-29 19:19:08 +00:00
Victor Hernandez 5f8c8c034a Keep ignoring pointer-to-pointer bitcasts 
llvm-svn: 94194
 2010-01-22 19:05:05 +00:00
Victor Hernandez 5f5abd598c No need to look through bitcasts for DbgInfoIntrinsic 
llvm-svn: 94112
 2010-01-21 23:07:15 +00:00
Eric Christopher 84bd316bd6 Fix comment. 
llvm-svn: 93831
 2010-01-19 01:20:15 +00:00
Chris Lattner a65e2f7304 split out load/store/alloca. 
llvm-svn: 92685
 2010-01-05 05:57:49 +00:00