llvm-project

Author	SHA1	Message	Date
Chris Lattner	f5b353c1fd	optimize a common idiom generated by clang for bitfield access, PR2638. llvm-svn: 54408	2008-08-06 07:35:52 +00:00
Chris Lattner	b5ee8b3e89	make truncate/sext elimination capable of changing phi's. This implements rdar://6013816 and the testcase in Transforms/InstCombine/sext-misc.ll. llvm-svn: 52440	2008-06-18 04:00:49 +00:00
Dan Gohman	0843435b36	Oops, commit the version of this test that actually works. llvm-svn: 51351	2008-05-20 21:19:36 +00:00
Dan Gohman	81ab753b14	Port SelectionDAG's ComputeNumSignBits-using code to instcombine, now that instcombine also has ComputeNumSignBits. llvm-svn: 51350	2008-05-20 21:01:12 +00:00
Dan Gohman	72ec3f4562	Teach InstCombine's ComputeMaskedBits what SelectionDAG's ComputeMaskedBits knows about cttz, ctlz, and ctpop. Teach SelectionDAG's ComputeMaskedBits what InstCombine's knows about SRem. And teach them both some things about high bits in Mul, UDiv, URem, and Sub. This allows instcombine and dagcombine to eliminate sign-extension operations in several new cases. llvm-svn: 50358	2008-04-28 17:02:21 +00:00