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2da70d1792
This optimization is unstable at this moment; it
1) block us on a very important application
2) PR15200
3) test6 and test7 in test/Transforms/ScalarRepl/dynamic-vector-gep.ll
(the CHECK command compare the output against wrong result)
I personally believe this optimization should not have any impact on the
autovectorized code, as auto-vectorizer is supposed to put gather/scatter
in a "right" way. Although in theory downstream optimizaters might reveal
some gather/scatter optimization opportunities, the chance is quite slim.
For the hand-crafted vectorizing code, in term of redundancy elimination,
load-CSE, copy-propagation and DSE can collectively achieve the same result,
but in much simpler way. On the other hand, these optimizers are able to
improve the code in a incremental way; in contrast, SROA is sort of all-or-none
approach. However, SROA might slighly win in stack size, as it tries to figure
out a stretch of memory tightenly cover the area accessed by the dynamic index.
rdar://13174884
PR15200
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178912 91177308-0d34-0410-b5e6-96231b3b80d8
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| .. | ||
| 2003-05-29-ArrayFail.ll | ||
| 2003-09-12-IncorrectPromote.ll | ||
| 2003-10-29-ArrayProblem.ll | ||
| 2006-11-07-InvalidArrayPromote.ll | ||
| 2007-05-29-MemcpyPreserve.ll | ||
| 2007-11-03-bigendian_apint.ll | ||
| 2008-01-29-PromoteBug.ll | ||
| 2008-02-28-SubElementExtractCrash.ll | ||
| 2008-06-05-loadstore-agg.ll | ||
| 2008-06-22-LargeArray.ll | ||
| 2008-08-22-out-of-range-array-promote.ll | ||
| 2008-09-22-vector-gep.ll | ||
| 2009-02-02-ScalarPromoteOutOfRange.ll | ||
| 2009-02-05-LoadFCA.ll | ||
| 2009-03-04-MemCpyAlign.ll | ||
| 2009-12-11-NeonTypes.ll | ||
| 2010-01-18-SelfCopy.ll | ||
| 2011-05-06-CapturedAlloca.ll | ||
| 2011-06-08-VectorExtractValue.ll | ||
| 2011-06-17-VectorPartialMemset.ll | ||
| 2011-09-22-PHISpeculateInvoke.ll | ||
| 2011-10-11-VectorMemset.ll | ||
| 2011-10-22-VectorCrash.ll | ||
| 2011-11-11-EmptyStruct.ll | ||
| address-space.ll | ||
| AggregatePromote.ll | ||
| arraytest.ll | ||
| badarray.ll | ||
| basictest.ll | ||
| bitfield-sroa.ll | ||
| copy-aggregate.ll | ||
| crash.ll | ||
| debuginfo-preserved.ll | ||
| DifferingTypes.ll | ||
| inline-vector.ll | ||
| lifetime.ll | ||
| lit.local.cfg | ||
| load-store-aggregate.ll | ||
| memcpy-align.ll | ||
| memset-aggregate-byte-leader.ll | ||
| memset-aggregate.ll | ||
| negative-memset.ll | ||
| nonzero-first-index.ll | ||
| not-a-vector.ll | ||
| only-memcpy-uses.ll | ||
| phi-cycle.ll | ||
| phi-select.ll | ||
| phinodepromote.ll | ||
| select_promote.ll | ||
| sroa_two.ll | ||
| sroa-fca.ll | ||
| union-fp-int.ll | ||
| union-packed.ll | ||
| union-pointer.ll | ||
| vector_memcpy.ll | ||
| vector_promote.ll | ||
| vectors-with-mismatched-elements.ll | ||
| volatile.ll | ||