llvm/test/Analysis/DependenceAnalysis, branch testing

Modified dump() to provide a little

2012-11-30T00:44:47Z

more information for dependences between instructions that don't share a common loop. Updated the test results appropriately. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168965 91177308-0d34-0410-b5e6-96231b3b80d8

Modified depends() to recognize that when all levels are "=" and

2012-11-27T19:12:26Z

there's no possible loo-independent dependence, then there's no dependence. Updated all test result appropriately. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168719 91177308-0d34-0410-b5e6-96231b3b80d8

Modify depends(Src, Dst, PossiblyLoopIndependent).

2012-11-27T06:41:46Z

If the Src and Dst are the same instruction, no loop-independent dependence is possible, so we force the PossiblyLoopIndependent flag to false. The test case results are updated appropriately. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168678 91177308-0d34-0410-b5e6-96231b3b80d8

Corrects a problem where we reply exclusively of GEPs to drive

2012-11-21T23:50:04Z

analysis. Better is to look for cases with useful GEPs and use them when possible. When a pair of useful GEPs is not available, use the raw SCEVs directly. This approach supports better analysis of pointer dereferencing. In parallel, all the test cases are updated appropriately. Cases where we have a store to *B++ can now be analyzed! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168474 91177308-0d34-0410-b5e6-96231b3b80d8

DependenceAnalysis: Print all dependency pairs when dumping. Update all testcases.

2012-11-13T12:12:02Z

Part of a patch by Preston Briggs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167827 91177308-0d34-0410-b5e6-96231b3b80d8

dependence analysis

2012-10-11T07:32:34Z

Patch from Preston Briggs . This is an updated version of the dependence-analysis patch, including an MIV test based on Banerjee's inequalities. It's a fairly complete implementation of the paper Practical Dependence Testing Gina Goff, Ken Kennedy, and Chau-Wen Tseng PLDI 1991 It cannot yet propagate constraints between coupled RDIV subscripts (discussed in Section 5.3.2 of the paper). It's organized as a FunctionPass with a single entry point that supports testing for dependence between two instructions in a function. If there's no dependence, it returns null. If there's a dependence, it returns a pointer to a Dependence which can be queried about details (what kind of dependence, is it loop independent, direction and distance vector entries, etc). I haven't included every imaginable feature, but there's a good selection that should be adequate for supporting many loop transformations. Of course, it can be extended as necessary. Included in the patch file are many test cases, commented with C code showing the loops and array references. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165708 91177308-0d34-0410-b5e6-96231b3b80d8