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424b2b0093
llvm-6502/test/Transforms
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Chandler Carruth 424b2b0093 [vectorizer] Teach the loop vectorizer's unroller to only unroll by 
powers of two. This is essentially always the correct thing given the
impact on alignment, scaling factors that can be used in addressing
modes, etc. Also, fix the management of the unroll vs. small loop cost
to more accurately model things with this world.

Enhance a test case to actually exercise more of the unroll machinery if
using synthetic constants rather than a specific target model. Before
this change, with the added flags this test will unroll 3 times instead
of either 2 or 4 (the two sensible answers).

While I don't expect this to make a huge difference, if there are lots
of loops sitting right on the edge of hitting the 'small unroll' factor,
they might change behavior. However, I've benchmarked moving the small
loop cost up and down in many various ways and by a huge factor (2x)
without seeing more than 0.2% code size growth. Small adjustments such
as the series that led up here have led to about 1% improvement on some
benchmarks, but it is very close to the noise floor so I mostly checked
that nothing regressed. Let me know if you see bad behavior on other
targets but I don't expect this to be a sufficiently dramatic change to
trigger anything.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200213 91177308-0d34-0410-b5e6-96231b3b80d8
2014-01-27 11:12:24 +00:00
..
ADCE [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
ArgumentPromotion Note the PR number. 2014-01-23 20:17:12 +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 Make nocapture analysis work with addrspacecast 2014-01-14 19:11:52 +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 broken CHECK lines. 2014-01-11 21:06:00 +00:00
IndVarSimplify [LPM] Make LoopSimplify no longer a LoopPass and instead both a utility 2014-01-23 11:23:19 +00:00
Inline Fix known typos 2014-01-24 17:20:08 +00:00
InstCombine InstCombine: Don't try to use aggregate elements of ConstantExprs. 2014-01-24 19:02:37 +00:00
InstSimplify InstSimplify: Make shift, select and GEP simplifications vector-aware. 2014-01-24 17:09:53 +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 [LPM] Make LCSSA a utility with a FunctionPass that applies it to all 2014-01-25 04:07:24 +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 [LPM] Make LCSSA a utility with a FunctionPass that applies it to all 2014-01-25 04:07:24 +00:00
LoopStrengthReduce Fix broken CHECK lines. 2014-01-11 21:06:00 +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 [vectorizer] Teach the loop vectorizer's unroller to only unroll by 2014-01-27 11:12:24 +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 Handle an addrspacecast case in memcpyopt 2014-01-22 21:53:19 +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 Fix known typos 2014-01-24 17:20:08 +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: Eliminate locale-sensitive message check. 2014-01-11 09:23:52 +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 Switch-to-lookup tables: set threshold to 3 cases 2014-01-15 05:00:27 +00:00
Sink [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
SLPVectorizer Fix broken CHECK lines. 2014-01-11 21:06:00 +00:00
SROA Fix a really nasty SROA bug with how we handled out-of-bounds memcpy 2014-01-19 12:16:54 +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