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c846d65f99
llvm-6502/test/Transforms
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Andrew Trick c846d65f99 Fix PR18361: Invalidate LoopDispositions after LoopSimplify hoists things. 
getSCEV for an ashr instruction creates an intermediate zext
expression when it truncates its operand.

The operand is initially inside the loop, so the narrow zext
expression has a non-loop-invariant loop disposition.

LoopSimplify then runs on an outer loop, hoists the ashr operand, and
properly invalidate the SCEVs that are mapped to value.

The SCEV expression for the ashr is now an AddRec with the hoisted
value as the now loop-invariant start value.

The LoopDisposition of this wide value was properly invalidated during
LoopSimplify.

However, if we later get the ashr SCEV again, we again try to create
the intermediate zext expression. We get the same SCEV that we did
earlier, and it is still cached because it was never mapped to a
Value. When we try to create a new AddRec we abort because we're using
the old non-loop-invariant LoopDisposition.

I don't have a solution for this other than to clear LoopDisposition
when LoopSimplify hoists things.

I think the long-term strategy should be to perform LoopSimplify on
all loops before computing SCEV and before running any loop opts on
individual loops. It's possible we may want to rerun LoopSimplify on
individual loops, but it should rarely do anything, so rarely require
invalidating SCEV.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198478 91177308-0d34-0410-b5e6-96231b3b80d8
2014-01-04 05:52:49 +00:00
..
ADCE [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
ArgumentPromotion ArgumentPromotion: correctly transfer TBAA tags and alignments. 2013-11-15 20:41:15 +00:00
BBVectorize Prevent LoopVectorizer and SLPVectorizer running if the target has no vector registers. 2013-09-18 12:43:35 +00:00
BranchFolding
CodeExtractor [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
CodeGenPrepare [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
ConstantMerge Corruptly merge constants with explicit and implicit alignments. 2013-11-12 20:21:43 +00:00
ConstProp Teach ConstantFolding about pointer address spaces 2013-08-20 21:20:04 +00:00
CorrelatedValuePropagation [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
DeadArgElim Debug Info: update testing cases to specify the debug info version number. 2013-11-22 21:49:45 +00:00
DeadStoreElimination Debug Info: update testing cases to specify the debug info version number. 2013-11-22 21:49:45 +00:00
DebugIR Use right pointer type in DebugIR 2013-09-27 22:26:25 +00:00
EarlyCSE [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
FunctionAttrs [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
GCOVProfiling Debug Info: update testing cases to specify the debug info version number. 2013-11-22 21:49:45 +00:00
GlobalDCE [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
GlobalOpt Delete unread globals through addrspacecast 2014-01-02 20:01:43 +00:00
GVN Fix PR17952. 2013-11-11 22:00:23 +00:00
IndVarSimplify indvars: insert truncate at loop boundary to avoid redundant IVs. 2014-01-02 19:29:38 +00:00
Inline [inliner] Fix PR18206 by preventing inlining functions that call setjmp 2013-12-13 08:00:01 +00:00
InstCombine Disable transforms that introduce calls to exp10*() on Linux due to 2013-12-28 02:40:19 +00:00
InstSimplify Add a test that large offsets on GEPs on 32 bits targets are handled correctly. 2013-09-28 21:27:49 +00:00
Internalize Correct word hyphenations 2013-12-05 05:44:44 +00:00
IPConstantProp [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
JumpThreading Don't eliminate a partially redundant load if it's in a landing pad. 2013-10-21 04:09:17 +00:00
LCSSA [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
LICM Debug Info: update testing cases to specify the debug info version number. 2013-11-23 01:16:29 +00:00
LoopDeletion [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
LoopIdiom Debug Info: update testing cases to specify the debug info version number. 2013-11-23 01:16:29 +00:00
LoopReroll Fix loop rerolling pass failure with non-consant loop lower bound 2014-01-03 17:20:01 +00:00
LoopRotate Rename test with misspelt filename 2013-12-02 04:31:36 +00:00
LoopSimplify Fix PR18361: Invalidate LoopDispositions after LoopSimplify hoists things. 2014-01-04 05:52:49 +00:00
LoopStrengthReduce Fix "existant" typos 2013-10-29 02:35:28 +00:00
LoopUnroll Implement TTI getUnrollingPreferences for PowerPC 2013-09-11 21:20:40 +00:00
LoopUnswitch [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
LoopVectorize LoopVectorizer: Don't if-convert constant expressions that can trap 2013-12-17 01:11:01 +00:00
LowerAtomic [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
LowerExpectIntrinsic [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
LowerInvoke [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
LowerSwitch Revert patches to add case-range support for PR1255. 2013-09-09 19:14:35 +00:00
Mem2Reg Debug Info: update testing cases to specify the debug info version number. 2013-11-22 21:49:45 +00:00
MemCpyOpt [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
MergeFunc PR17925 bugfix. 2013-11-26 16:11:03 +00:00
MetaRenamer [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
ObjCARC BasicAA: Use reachabilty instead of dominance for checking value equality in phi 2014-01-03 05:47:03 +00:00
PhaseOrdering [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
PruneEH [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
Reassociate [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
Reg2Mem [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
SampleProfile llvm/test/Transforms/SampleProfile/syntax.ll: Relax an expression, not to check locale-dependent message. 2013-12-03 02:20:53 +00:00
Scalarizer Fix Scalarizer insertion point when replacing PHIs with insertelements 2013-12-23 14:51:56 +00:00
ScalarRepl Debug Info: update testing cases to specify the debug info version number. 2013-11-22 21:49:45 +00:00
SCCP [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
SimplifyCFG Transforms: Don't create bad weights when eliminating dead cases 2013-12-20 08:21:30 +00:00
Sink [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
SLPVectorizer SLPVectorizer: An in-tree vectorized entry cannot also be a scalar external use 2013-12-05 15:14:40 +00:00
SROA Fix an issue where SROA computed different results based on the relative 2013-11-19 09:03:18 +00:00
StripSymbols Debug Info: update testing cases to specify the debug info version number. 2013-11-22 21:49:45 +00:00
StructurizeCFG StructurizeCFG: Fix verification failure with some loops. 2013-11-22 19:24:39 +00:00
TailCallElim [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
TailDup [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00