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4c063981c7
llvm-mirror/test/Transforms
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Sanjoy Das 4c063981c7 [IndVars] Make loop varying predicates loop invariant. 
Summary:
Was D9784: "Remove loop variant range check when induction variable is
strictly increasing"

This change re-implements D9784 with the two differences:

 1. It does not use SCEVExpander and does not generate new
    instructions.  Instead, it does a quick local search for existing
    `llvm::Value`s that it needs when modifying the `icmp`
    instruction.

 2. It is more general -- it deals with both increasing and decreasing
    induction variables.

I've added all of the tests included with D9784, and two more.

As an example on what this change does (copied from D9784):

Given C code:

```
for (int i = M; i < N; i++) // i is known not to overflow
  if (i < 0) break;
  a[i] = 0;
}
```

This transformation produces:

```
for (int i = M; i < N; i++)
  if (M < 0) break;
  a[i] = 0;
}
```

Which can be unswitched into:

```
if (!(M < 0))
  for (int i = M; i < N; i++)
    a[i] = 0;
}
```

I went back and forth on whether the top level logic should live in
`SimplifyIndvar::eliminateIVComparison` or be put into its own
routine.  Right now I've put it under `eliminateIVComparison` because
even though the `icmp` is not *eliminated*, it no longer is an IV
comparison.  I'm open to putting it in its own helper routine if you
think that is better.

Reviewers: reames, nicholas, atrick

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D11278

llvm-svn: 243331
2015-07-27 21:42:49 +00:00
..
ADCE Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
AddDiscriminators IR: Give 'DI' prefix to debug info metadata 2015-04-29 16:38:44 +00:00
AlignmentFromAssumptions
ArgumentPromotion Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
AtomicExpand/ARM
BBVectorize Changed renaming of local symbols by inserting a dot vefore the numeric suffix. 2015-05-12 16:47:30 +00:00
BDCE Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
BranchFolding
CodeExtractor Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
CodeGenPrepare AMDGPU: Fix some places missed in rename 2015-06-19 17:39:03 +00:00
ConstantHoisting [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
ConstantMerge [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
ConstProp Fix assert when inlining a constantexpr addrspacecast 2015-07-27 18:31:03 +00:00
CorrelatedValuePropagation [CVP] Don't assume Constants of type i1 can be known to be true or false 2015-06-06 04:56:51 +00:00
DeadArgElim DI/Verifier: Fix argument bitrot in DILocalVariable 2015-07-24 23:59:25 +00:00
DeadStoreElimination IR: Give 'DI' prefix to debug info metadata 2015-04-29 16:38:44 +00:00
EarlyCSE Correct a mistaken comment from 238071 [NFC] 2015-05-23 00:05:43 +00:00
EliminateAvailableExternally Don't change the visibility when converting a definition to a declaration. 2015-07-13 14:18:22 +00:00
Float2Int Reapply r233175 and r233183: float2int. 2015-03-27 10:36:57 +00:00
FunctionAttrs Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
GCOVProfiling IR: Give 'DI' prefix to debug info metadata 2015-04-29 16:38:44 +00:00
GlobalDCE [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
GlobalOpt DI/Verifier: Fix argument bitrot in DILocalVariable 2015-07-24 23:59:25 +00:00
GVN GVN: tolerate an instruction being replaced without existing in the leaderboard 2015-07-14 21:03:18 +00:00
IndVarSimplify [IndVars] Make loop varying predicates loop invariant. 2015-07-27 21:42:49 +00:00
Inline Fix assert when inlining a constantexpr addrspacecast 2015-07-27 18:31:03 +00:00
InstCombine [InstCombine][X86][SSE] Replace sign/zero extension intrinsics with native IR 2015-07-27 18:52:15 +00:00
InstMerge [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
InstSimplify [InstSimplify] Teach InstSimplify how to simplify extractelement 2015-07-13 01:15:53 +00:00
Internalize Internalize: internalize comdat members as a group, and drop comdat on such members. 2015-07-16 17:42:21 +00:00
IPConstantProp Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
IRCE [IRCE] Fix a regression introduced in r232444. 2015-03-24 19:29:18 +00:00
JumpThreading Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
LCSSA Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
LICM [LICM] Don't try to sink values out of loops without any exits 2015-07-12 03:53:05 +00:00
LoadCombine
LoopDeletion
LoopDistribute [LAA] Merge memchecks for accesses separated by a constant offset 2015-07-08 09:16:33 +00:00
LoopIdiom Remove unnecessary lines from the test in r242068. 2015-07-13 21:50:35 +00:00
LoopInterchange Add support to interchange loops with reductions. 2015-04-23 04:51:44 +00:00
LoopReroll Handle loop with negtive induction variable increment 2015-07-24 22:01:49 +00:00
LoopRotate DI/Verifier: Fix argument bitrot in DILocalVariable 2015-07-24 23:59:25 +00:00
LoopSimplify [LoopSimplify] Set proper debug location in loop backedge blocks. 2015-06-29 21:30:14 +00:00
LoopStrengthReduce [LSR] don't attempt to promote ephemeral values to indvars 2015-07-13 03:28:53 +00:00
LoopUnroll Roll forward r243250 2015-07-26 19:10:03 +00:00
LoopUnswitch [LoopUnswitch] Improve loop unswitch pass to find trivial unswitch conditions more effectively 2015-07-25 03:21:06 +00:00
LoopVectorize The tests added in r243270 require asserts to be enabled 2015-07-27 15:22:49 +00:00
LowerAtomic
LowerBitSets LowerBitSets: Ignore bitset entries that do not directly refer to a global. 2015-06-27 00:17:51 +00:00
LowerExpectIntrinsic [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
LowerInvoke Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
LowerSwitch Changed renaming of local symbols by inserting a dot vefore the numeric suffix. 2015-05-12 16:47:30 +00:00
Mem2Reg DI/Verifier: Fix argument bitrot in DILocalVariable 2015-07-24 23:59:25 +00:00
MemCpyOpt [MemCpyOpt] Do move the memset, but look at its dest's dependencies. 2015-05-21 01:43:39 +00:00
MergeFunc MergeFunc: Transfer the callee's attributes when replacing a direct caller 2015-07-21 17:07:07 +00:00
MetaRenamer
NaryReassociate [NaryReassociate] enhances nsw by leveraging @llvm.assume 2015-07-01 03:38:49 +00:00
ObjCARC Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
PartiallyInlineLibCalls
PhaseOrdering Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
PlaceSafepoints Rename llvm.frameescape and llvm.framerecover to localescape and localrecover 2015-07-07 22:25:32 +00:00
PruneEH [PruneEH] A naked, noinline function can return via InlineAsm 2015-06-27 07:52:53 +00:00
Reassociate [Reassociate] Don't propogate flags when creating negations 2015-06-24 21:27:36 +00:00
Reg2Mem Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
RewriteStatepointsForGC [RewriteStatepointsForGC] Adjust naming scheme to be more stable 2015-07-24 19:01:39 +00:00
SafeStack SafeStack: Create the unsafe stack pointer on demand. 2015-06-22 20:26:54 +00:00
SampleProfile Add function entry counts from sample profiles. 2015-05-13 17:04:29 +00:00
Scalarizer [Scalarizer] Fix potential for stale data in Scattered across invocations 2015-07-23 20:53:46 +00:00
ScalarRepl Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
SCCP [ConstantFolding] Support folding loads from a GlobalAlias 2015-07-22 22:29:30 +00:00
SeparateConstOffsetFromGEP AMDGPU: Fix some places missed in rename 2015-06-19 17:39:03 +00:00
SimplifyCFG AMDGPU: Fix some places missed in rename 2015-06-19 17:39:03 +00:00
Sink Teach the IR Sink pass to (conservatively) respect convergent annotations. 2015-06-01 17:20:31 +00:00
SLPVectorizer [SLPVectorizer] Try different vectorization factors for store chains 2015-07-08 23:40:55 +00:00
SpeculativeExecution Add a speculative execution pass 2015-05-15 17:54:48 +00:00
SROA [SROA] Fix a nasty pile of bugs to do with big-endian, different alloca 2015-07-22 03:32:42 +00:00
StraightLineStrengthReduce [NVPTX] enable SpeculativeExecution in NVPTX 2015-07-16 20:13:48 +00:00
StripSymbols DI/Verifier: Fix argument bitrot in DILocalVariable 2015-07-24 23:59:25 +00:00
StructurizeCFG
TailCallElim TRE: Just erase dead BBs and tweak the iteration loop not to increment the deleted BB iterator. 2015-02-28 16:47:27 +00:00
TailDup [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
Util Changed renaming of local symbols by inserting a dot vefore the numeric suffix. 2015-05-12 16:47:30 +00:00