Dan Gohman d13f674130 Factor the code for collecting IV users out of LSR into an IVUsers class, ... and generalize it so that it can be used by IndVarSimplify. Implement the base IndVarSimplify transformation code using IVUsers. This removes TestOrigIVForWrap and associated code, as ScalarEvolution now has enough builtin overflow detection and folding logic to handle all the same cases, and more. Run "opt -iv-users -analyze -disable-output" on your favorite loop for an example of what IVUsers does. This lets IndVarSimplify eliminate IV casts and compute trip counts in more cases. Also, this happens to finally fix the remaining testcases in PR1301. Now that IndVarSimplify is being more aggressive, it occasionally runs into the problem where ScalarEvolutionExpander's code for avoiding duplicate expansions makes it difficult to ensure that all expanded instructions dominate all the instructions that will use them. As a temporary measure, IndVarSimplify now uses a FixUsesBeforeDefs function to fix up instructions inserted by SCEVExpander. Fortunately, this code is contained, and can be easily removed once a more comprehensive solution is available. llvm-svn: 71535		2009-05-12 02:17:14 +00:00
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Alpha
ARM	Fix pr4100. Do not remove no-op copies when they are dead. The register	2009-05-07 23:47:03 +00:00
CBackend
CellSPU
CPP	Fix code emission for conditional branches.	2009-05-04 19:10:38 +00:00
Generic	Disable the load-shrinking optimization from looking at	2009-04-29 03:45:07 +00:00
IA64
Mips
MSP430	Add MSP430 test for PR4136	2009-05-10 14:48:36 +00:00
PowerPC	Second attempt:	2009-04-29 00:15:41 +00:00
SPARC
X86	Factor the code for collecting IV users out of LSR into an IVUsers class,	2009-05-12 02:17:14 +00:00
XCore