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464bda3a16
llvm/test/Transforms/Reassociate
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Chandler Carruth 464bda3a16 Teach the reassociate pass to fold chains of multiplies with repeated 
elements to minimize the number of multiplies required to compute the
final result. This uses a heuristic to attempt to form near-optimal
binary exponentiation-style multiply chains. While there are some cases
it misses, it seems to at least a decent job on a very diverse range of
inputs.

Initial benchmarks show no interesting regressions, and an 8%
improvement on SPASS. Let me know if any other interesting results (in
either direction) crop up!

Credit to Richard Smith for the core algorithm, and helping code the
patch itself.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155616 91177308-0d34-0410-b5e6-96231b3b80d8
2012-04-26 05:30:30 +00:00
..
2002-05-15-AgressiveSubMove.ll Change tests from "opt %s" to "opt < %s" so that opt doesn't see the 2009-09-11 18:01:28 +00:00
2002-05-15-MissedTree.ll Use opt -S instead of piping bitcode output through llvm-dis. 2009-09-08 22:34:10 +00:00
2002-05-15-SubReassociate2.ll Change tests from "opt %s" to "opt < %s" so that opt doesn't see the 2009-09-11 18:01:28 +00:00
2002-05-15-SubReassociate.ll Change tests from "opt %s" to "opt < %s" so that opt doesn't see the 2009-09-11 18:01:28 +00:00
2002-07-09-DominanceProblem.ll Change tests from "opt %s" to "opt < %s" so that opt doesn't see the 2009-09-11 18:01:28 +00:00
2003-08-12-InfiniteLoop.ll Change tests from "opt %s" to "opt < %s" so that opt doesn't see the 2009-09-11 18:01:28 +00:00
2005-08-24-Crash.ll Change tests from "opt %s" to "opt < %s" so that opt doesn't see the 2009-09-11 18:01:28 +00:00
2005-09-01-ArrayOutOfBounds.ll Change tests from "opt %s" to "opt < %s" so that opt doesn't see the 2009-09-11 18:01:28 +00:00
2006-04-27-ReassociateVector.ll Change tests from "opt %s" to "opt < %s" so that opt doesn't see the 2009-09-11 18:01:28 +00:00
2011-01-26-UseAfterFree.ll Land the long talked about "type system rewrite" patch. This 2011-07-09 17:41:24 +00:00
basictest.ll Add a test for my change to disable reassociation for i1 types. 2010-02-06 01:16:25 +00:00
crash.ll Fix reassociate to postpone certain instruction deletions until 2011-03-10 19:51:54 +00:00
inverses.ll filecheckize 2010-01-18 21:58:32 +00:00
lit.local.cfg Replace all instances of dg.exp file with lit.local.cfg, since all tests are run with LIT now and now Dejagnu. dg.exp is no longer needed. 2012-02-16 06:28:33 +00:00
looptest.ll Change tests from "opt %s" to "opt < %s" so that opt doesn't see the 2009-09-11 18:01:28 +00:00
mulfactor.ll Teach the reassociate pass to fold chains of multiplies with repeated 2012-04-26 05:30:30 +00:00
negation.ll Change tests from "opt %s" to "opt < %s" so that opt doesn't see the 2009-09-11 18:01:28 +00:00
optional-flags.ll fix PR9215, preventing -reassociate from clearing nsw/nuw when 2011-02-17 01:29:24 +00:00
otherops.ll Change tests from "opt %s" to "opt < %s" so that opt doesn't see the 2009-09-11 18:01:28 +00:00
secondary.ll Fix reassociate to use a worklist instead of recursing when new 2011-04-12 00:11:56 +00:00
shift-factor.ll Convert more tests to avoid llvm-as. 2009-09-11 18:36:27 +00:00
shifttest.ll Change tests from "opt %s" to "opt < %s" so that opt doesn't see the 2009-09-11 18:01:28 +00:00
subtest2.ll Change tests from "opt %s" to "opt < %s" so that opt doesn't see the 2009-09-11 18:01:28 +00:00
subtest.ll Change tests from "opt %s" to "opt < %s" so that opt doesn't see the 2009-09-11 18:01:28 +00:00