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
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2005-08-15-AddRecIV.ll
2005-08-17-OutOfLoopVariant.ll
2005-09-12-UsesOutOutsideOfLoop.ll
2007-04-23-UseIterator.ll
2008-08-06-CmpStride.ll
2008-08-13-CmpStride.ll
2008-08-14-ShadowIV.ll
2008-09-09-Overflow.ll
2009-01-13-nonconstant-stride-outside-loop.ll
2009-02-09-ivs-different-sizes.ll
2009-04-28-no-reduce-mul.ll	Factor the code for collecting IV users out of LSR into an IVUsers class,	2009-05-12 02:17:14 +00:00
change-compare-stride-trickiness-0.ll
change-compare-stride-trickiness-1.ll	Teach getZeroExtendExpr and getSignExtendExpr to use trip-count	2009-04-27 20:16:15 +00:00
dead-phi.ll
dg.exp
different-type-ivs.ll
dont_insert_redundant_ops.ll
dont_reduce_bytes.ll
dont-hoist-simple-loop-constants.ll
exit_compare_live_range.ll
invariant_value_first_arg.ll
invariant_value_first.ll
nested-reduce.ll
ops_after_indvar.ll
phi_node_update_multiple_preds.ll
pr2537.ll	Testcase for PR2537.	2009-04-23 04:26:42 +00:00
pr2570.ll	Previously, RecursivelyDeleteDeadInstructions provided an option	2009-05-02 18:29:22 +00:00
pr3086.ll	Don't try to mix integers and pointers in an icmp instruction	2009-04-30 16:40:30 +00:00
pr3399.ll	Strengthen the "non-constant stride must dominate loop preheader" check.	2009-02-17 00:13:06 +00:00
pr3571.ll	Fix pr3571: If stride is a value defined by an instruction, make sure it dominates the loop preheader. When IV users are strength reduced, the stride is inserted into the preheader. It could create a use before def situation.	2009-02-15 06:06:15 +00:00
related_indvars.ll
remove_indvar.ll
share_code_in_preheader.ll
share_ivs.ll
use_postinc_value_outside_loop.ll	Implement "superhero" strength reduction, or full strength	2009-02-20 04:17:46 +00:00
var_stride_used_by_compare.ll
variable_stride.ll