Dan Gohman 81db61a2e6 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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71535 91177308-0d34-0410-b5e6-96231b3b80d8		2009-05-12 02:17:14 +00:00
..
2002-09-09-PointerIndVar.ll
2003-04-16-ExprAnalysis.ll
2003-09-12-MultiplePred.ll
2003-09-23-NotAtTop.ll	Make this testcase slightly less trivial, so that it doesn't fail	2009-04-28 22:03:26 +00:00
2003-12-10-IndVarDeadCode.ll
2003-12-10-RemoveInstrCrash.ll
2003-12-15-Crash.ll
2003-12-21-IndVarSize.ll
2004-03-10-PHIInsertionBug.ll
2004-04-05-InvokeCastCrash.ll
2004-04-07-ScalarEvolutionCrash.ll
2005-02-11-InvokeCrash.ll
2005-02-17-TruncateExprCrash.ll
2005-02-26-ExitValueCompute.ll
2005-06-15-InstMoveCrash.ll
2005-11-18-Crash.ll
2006-03-31-NegativeStride.ll
2006-06-16-Indvar-LCSSA-Crash.ll
2006-09-20-LFTR-Crash.ll
2006-12-10-BitCast.ll
2007-01-06-TripCount.ll
2007-01-08-X86-64-Pointer.ll
2007-06-06-DeleteDanglesPtr.ll
2007-11-23-BitcastCrash.ll
2008-06-15-SCEVExpanderBug.ll
2008-09-02-IVType.ll
2008-10-03-CouldNotCompute.ll
2008-11-03-Floating.ll
2008-11-17-Floating.ll
2008-11-25-APFloatAssert.ll
2009-04-14-shorten_iv_vars.ll	Enhance induction variable code to remove the	2009-04-15 01:10:12 +00:00
2009-04-15-shorten-iv-vars-2.ll	Factor the code for collecting IV users out of LSR into an IVUsers class,	2009-05-12 02:17:14 +00:00
2009-04-22-IndvarCrash.ll	Make sure both operands have binary instructions have the same type.	2009-04-22 23:39:28 +00:00
2009-04-27-Floating.ll	Fix PR 4086, a bug in FP IV elimination.	2009-04-27 21:03:15 +00:00
ada-loops.ll	Factor the code for collecting IV users out of LSR into an IVUsers class,	2009-05-12 02:17:14 +00:00
avoid-i0.ll	Handle ands with ~0 correctly too. This fixes PR4052.	2009-04-27 01:41:10 +00:00
casted-argument.ll	Fix an error in this test.	2009-04-23 15:22:28 +00:00
complex-scev.ll
dg.exp
exit_value_tests.ll
iterationCount_zext_or_trunc.ll
iv-zext.ll	Factor the code for collecting IV users out of LSR into an IVUsers class,	2009-05-12 02:17:14 +00:00
lftr_simple.ll
loop_evaluate_1.ll
loop_evaluate_2.ll
loop_evaluate_3.ll
loop_evaluate_4.ll
loop_evaluate_5.ll	When forgetting SCEVs for loop PHIs, don't forget SCEVUnknown values.	2009-05-12 01:27:58 +00:00
loop_evaluate_6.ll	Factor the code for collecting IV users out of LSR into an IVUsers class,	2009-05-12 02:17:14 +00:00
pointer-indvars.ll
preserve-signed-wrap.ll	Back out the change in 64918 that used sign-extensions when promoting	2009-02-23 23:20:35 +00:00
promote-iv-to-eliminate-casts.ll	Back out the change in 64918 that used sign-extensions when promoting	2009-02-23 23:20:35 +00:00
signed-trip-count.ll	Back out the change in 64918 that used sign-extensions when promoting	2009-02-23 23:20:35 +00:00
subtract.ll
tripcount_compute.ll
tripcount_infinite.ll
variable-stride-ivs.ll