llvm-project

Author	SHA1	Message	Date
Chris Lattner	e112ff64c5	fix a potential overflow issue Eli pointed out. llvm-svn: 94336	2010-01-23 23:31:46 +00:00
Chris Lattner	249da5cb73	implement a simple instcombine xform that has been in the readme forever. llvm-svn: 94318	2010-01-23 18:49:30 +00:00
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

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