Eli Friedman 12bb766ae9 Fix for PR3016: detect the tricky case, where there are ... unfoldable references to a PHI node in the block being folded, and disable the transformation in that case. The correct transformation of such PHI nodes depends on whether BB dominates Succ, and dominance is expensive to compute here. (Alternatively, it's possible to check whether any uses are live, but that's also essentially a dominance calculation. Another alternative is to use reg2mem, but it probably isn't a good idea to use that in simplifycfg.) Also, remove some incorrect code from CanPropagatePredecessorsForPHIs which is made unnecessary with this patch: it didn't consider the case where a PHI node in BB has multiple uses. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79174 91177308-0d34-0410-b5e6-96231b3b80d8		2009-08-16 04:23:49 +00:00
..
Hello	Removed trailing whitespace from Makefiles.	2009-01-09 16:44:42 +00:00
Instrumentation	Push LLVMContexts through the IntegerType APIs.	2009-08-13 21:58:54 +00:00
IPO	Make TargetData optional in GlobalOpt and ArgumentPromotion.	2009-08-14 00:11:03 +00:00
Scalar	Don't try to get the context from an erased Instruction.	2009-08-15 21:07:49 +00:00
Utils	Fix for PR3016: detect the tricky case, where there are	2009-08-16 04:23:49 +00:00
Makefile	I should definitely read make docs someday :(	2009-03-11 20:40:15 +00:00