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Author SHA1 Message Date
John McCall
d293c4e6e0 Somehow I was getting reasonable results for the test cases I was interested 
in despite not ever incrementing any path costs, so that the only nonzero costs
arose from the all-left path in the first column.  Anyway.  Perform the diff
starting from the beginning of the block to avoid capturing (say) loads of
allocas.

Vastly improves diff results on code that hasn't been mem2reg'ed.

llvm-svn: 109741
 2010-07-29 08:53:59 +00:00
John McCall
10c91bfa66 Cache the result of errs() and implement formatted logging. 
llvm-svn: 109740
 2010-07-29 08:14:41 +00:00
John McCall
5e6a16d71f Add the llvm-diff tool, which performs a relatively naive structural 
diff of a function.  There's a lot of cruft in the current version, and
it's pretty far from perfect, but it's usable.

Currently only capable of comparing functions.  Currently ignores metadata.
Currently ignores most attributes of functions and instructions.

Patches welcome.

llvm-svn: 109739
 2010-07-29 07:53:27 +00:00