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Author SHA1 Message Date
Chris Lattner 54f4e39956 optimize comparisons against cttz/ctlz/ctpop, patch by Alastair Lynn! 
llvm-svn: 92745
 2010-01-05 18:09:56 +00:00
Chris Lattner a751d09c08 Truncate GEP indexes larger than the pointer size down to pointer size 
when doing this transform if the GEP is not inbounds.  No testcase because
it is very difficult to trigger this: instcombine already canonicalizes
GEP indices to pointer size, so it relies specific permutations of the
instcombine worklist.

Thanks to Duncan for pointing this possible problem out.

llvm-svn: 92495
 2010-01-04 18:57:15 +00:00
Chris Lattner 2188e40e4c split instcombine of compares (visit[FI]Cmp) out to 
a new InstCombineCompares.cpp file.

llvm-svn: 92467
 2010-01-04 07:37:31 +00:00