2 Commits

Author	SHA1	Message	Date
Owen Anderson	272ff94916	When TCO is turned on, it is possible to end up with aliasing FrameIndex's. Therefore, ... CombinerAA cannot assume that different FrameIndex's never alias, but can instead use MachineFrameInfo to get the actual offsets of these slots and check for actual aliasing. This fixes CodeGen/X86/2010-02-19-TailCallRetAddrBug.ll and CodeGen/X86/tailcallstack64.ll when CombinerAA is enabled, modulo a different register allocation sequence. llvm-svn: 114348	2010-09-20 20:39:59 +00:00
Owen Anderson	b92b13d8a0	Invert the logic of reachesChainWithoutSideEffects(). What we want to check is that there is ... NO path to the destination containing side effects, not that SOME path contains no side effects. In practice, this only manifests with CombinerAA enabled, because otherwise the chain has little to no branching, so "any" is effectively equivalent to "all". llvm-svn: 114268	2010-09-18 04:45:14 +00:00