Andrea Di Biagio 44926033f6 [TTI] Teach the cost heuristic how to query TLI to check if a zext/trunc is 'free' for the target. ... Now that SimplifyCFG uses TTI for the cost heuristic, we can teach BasicTTIImpl how to query TLI in order to get a more accurate cost for truncates and zero-extends. Before this patch, the basic cost heuristic in TargetTransformInfoImplCRTPBase would have conservatively returned a 'default' TCC_Basic for all zero-extends, and TCC_Free for truncates on native types. This patch improves the heuristic so that we query TLI (if available) to get more accurate answers. If TLI is available, then methods 'isZExtFree' and 'isTruncateFree' can be used to check if a zext/trunc is free for the target. Added more test cases to SimplifyCFG/X86/speculate-cttz-ctlz.ll. With this change, SimplifyCFG is now able to speculate a 'cheap' cttz/ctlz immediately followed by a free zext/trunc. Differential Revision: http://reviews.llvm.org/D7585 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228923 91177308-0d34-0410-b5e6-96231b3b80d8		2015-02-12 14:17:24 +00:00
..
SPARC	Reduce verbiage of lit.local.cfg files	2014-06-09 22:42:55 +00:00
X86	[TTI] Teach the cost heuristic how to query TLI to check if a zext/trunc is 'free' for the target.	2015-02-12 14:17:24 +00:00
2002-05-21-PHIElimination.ll
2002-09-24-PHIAssertion.ll
2003-03-07-DominateProblem.ll
2003-08-05-InvokeCrash.ll
2003-08-17-BranchFold.ll
2003-08-17-BranchFoldOrdering.ll
2003-08-17-FoldSwitch-dbg.ll
2003-08-17-FoldSwitch.ll
2004-12-10-SimplifyCFGCrash.ll
2005-06-16-PHICrash.ll
2005-08-01-PHIUpdateFail.ll
2005-10-02-InvokeSimplify.ll
2005-12-03-IncorrectPHIFold.ll
2006-02-17-InfiniteUnroll.ll
2006-06-12-InfLoop.ll
2006-08-03-Crash.ll
2006-10-19-UncondDiv.ll
2006-12-08-Ptr-ICmp-Branch.ll
2007-11-22-InvokeNoUnwind.ll	Don't promote asynch EH invokes of nounwind functions to calls	2015-02-11 01:23:16 +00:00
2007-12-21-Crash.ll
2008-01-02-hoist-fp-add.ll	[SimplifyCFG] Swap to using TargetTransformInfo for cost	2015-02-11 12:15:41 +00:00
2008-05-16-PHIBlockMerge.ll
2008-07-13-InfLoopMiscompile.ll
2008-09-08-MultiplePred.ll
2008-09-17-SpeculativeHoist.ll
2008-10-03-SpeculativelyExecuteBeforePHI.ll
2008-12-06-SingleEntryPhi.ll
2008-12-16-DCECond.ll
2009-01-18-PHIPropCrash.ll
2009-01-19-UnconditionalTrappingConstantExpr.ll
2009-05-12-externweak.ll
2010-03-30-InvokeCrash.ll
2011-03-08-UnreachableUse.ll
2011-09-05-TrivialLPad.ll
assume.ll	Add @llvm.assume, lowering, and some basic properties	2014-07-25 21:13:35 +00:00
attr-noduplicate.ll
basictest.ll	[PM] Port SimplifyCFG to the new pass manager.	2015-02-01 11:34:21 +00:00
branch-cond-merge.ll
branch-cond-prop.ll
branch-fold-dbg.ll	IR: Move MDLocation into place	2015-01-14 22:27:36 +00:00
branch-fold-test.ll
branch-fold-threshold.ll	[SimplifyCFG] threshold for folding branches with common destination	2014-09-30 22:23:38 +00:00
branch-fold.ll
branch-phi-thread.ll
BrUnwind.ll
common-dest-folding.ll
CoveredLookupTable.ll
dbginfo.ll
dce-cond-after-folding-terminator.ll
DeadSetCC.ll
duplicate-phis.ll
EmptyBlockMerge.ll
EqualPHIEdgeBlockMerge.ll
extract-cost.ll	Add ExtractValue instruction to SimplifyCFG's ComputeSpeculationCost	2014-05-09 17:02:46 +00:00
ForwardSwitchConditionToPHI.ll
hoist-common-code.ll
hoist-dbgvalue.ll	IR: Move MDLocation into place	2015-01-14 22:27:36 +00:00
hoist-with-range.ll	IR: Make metadata typeless in assembly	2014-12-15 19:07:53 +00:00
HoistCode.ll
indirectbr.ll
invoke_unwind.ll
invoke.ll
iterative-simplify.ll
lifetime.ll	SimplifyCFG: Avoid miscompilations due to removed lifetime intrinsics.	2014-07-30 21:04:00 +00:00
MagicPointer.ll
multiple-phis.ll
no_speculative_loads_with_tsan.ll
noreturn-call.ll
phi-undef-loadstore.ll
PhiBlockMerge2.ll
PhiBlockMerge.ll	[SimplifyCFG] Swap to using TargetTransformInfo for cost	2015-02-11 12:15:41 +00:00
PhiEliminate2.ll
PhiEliminate3.ll
PhiEliminate.ll
PHINode.ll
PhiNoEliminate.ll
PR9946.ll
PR16069.ll
PR17073.ll	Fix for PR17073 ( http://llvm.org/pr17073 ), simplifycfg illegally hoists an operation in a phi node that can trap.	2014-07-07 21:19:00 +00:00
preserve-branchweights-partial.ll	IR: Make metadata typeless in assembly	2014-12-15 19:07:53 +00:00
preserve-branchweights-switch-create.ll	IR: Make metadata typeless in assembly	2014-12-15 19:07:53 +00:00
preserve-branchweights.ll	IR: Make metadata typeless in assembly	2014-12-15 19:07:53 +00:00
return-merge.ll
seh-nounwind.ll	Don't promote asynch EH invokes of nounwind functions to calls	2015-02-11 01:23:16 +00:00
select-gep.ll	[SimplifyCFG] Swap to using TargetTransformInfo for cost	2015-02-11 12:15:41 +00:00
sink-common-code.ll	[SimplifyCFG] Revise common code sinking	2014-12-23 08:26:55 +00:00
speculate-math.ll	Add minnum / maxnum intrinsics	2014-10-21 23:00:20 +00:00
speculate-store.ll
speculate-vector-ops.ll	Make bitcast, extractelement, and insertelement considered cheap for speculation.	2014-05-30 18:34:43 +00:00
speculate-with-offset.ll
SpeculativeExec.ll	[TTI] Improved cost heuristic for cttz/ctlz calls.	2015-02-11 14:22:18 +00:00
switch_create.ll
switch_switch_fold.ll
switch_thread.ll
switch-masked-bits.ll
switch-on-const-select.ll
switch-range-to-icmp.ll	SimplifyCFG: don't remove unreachable default switch destinations	2015-01-26 19:52:32 +00:00
switch-simplify-crash.ll
switch-to-br.ll	Add some tests for SimplifyCFG's ConstantFoldTerminator(). NFC.	2014-12-04 22:19:25 +00:00
switch-to-icmp.ll
switch-to-select-multiple-edge-per-block-phi.ll	Switch to select optimization for two-case switches	2014-10-14 01:58:26 +00:00
switch-to-select-two-case.ll	SimplifyCFG: don't remove unreachable default switch destinations	2015-01-26 19:52:32 +00:00
trap-debugloc.ll	IR: Move MDLocation into place	2015-01-14 22:27:36 +00:00
trapping-load-unreachable.ll	IR: add a second ordering operand to cmpxhg for failure	2014-03-11 10:48:52 +00:00
two-entry-phi-return.ll
UncondBranchToReturn.ll
unreachable-blocks.ll
UnreachableEliminate.ll	SimplifyCFG: don't remove unreachable default switch destinations	2015-01-26 19:52:32 +00:00
volatile-phioper.ll	IR: Make metadata typeless in assembly	2014-12-15 19:07:53 +00:00