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5 Commits

Author SHA1 Message Date
Chris Lattner 43f2fa6201 my instcombine transformations to make extension elimination more 
aggressive changed the canonical form from sext(trunc(x)) to ashr(lshr(x)),
make sure to transform a couple more things into that canonical form,
and catch a case where we missed turning zext/shl/ashr into a single sext.

llvm-svn: 93787
 2010-01-18 22:19:16 +00:00
Chris Lattner d8509424a4 change the preferred canonical form for a sign extension to be 
lshr+ashr instead of trunc+sext.  We want to avoid type 
conversions whenever possible, it is easier to codegen expressions
without truncates and extensions.

llvm-svn: 93107
 2010-01-10 07:08:30 +00:00
Chris Lattner 2b459fe7e1 fix indentation of switch statements, no functionality change. 
llvm-svn: 93106
 2010-01-10 06:59:55 +00:00
Chris Lattner a1e223ea10 teach instcombine to delete sign extending shift pairs (sra(shl X, C), C) when 
the input is already sign extended.

llvm-svn: 93019
 2010-01-08 19:04:21 +00:00
Chris Lattner dc67e13442 split instcombine of shifts out to its own file. 
llvm-svn: 92709
 2010-01-05 07:44:46 +00:00