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bc33cd14d7
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Hans Wennborg bc33cd14d7 Switch lowering: extract jump tables and bit tests before building binary tree (PR22262) 
This is a major rewrite of the SelectionDAG switch lowering. The previous code
would lower switches as a binary tre, discovering clusters of cases
suitable for lowering by jump tables or bit tests as it went along. To increase
the likelihood of finding jump tables, the binary tree pivot was selected to
maximize case density on both sides of the pivot.

By not selecting the pivot in the middle, the binary trees would not always
be balanced, leading to performance problems in the generated code.

This patch rewrites the lowering to search for clusters of cases
suitable for jump tables or bit tests first, and then builds the binary
tree around those clusters. This way, the binary tree will always be balanced.

This has the added benefit of decoupling the different aspects of the lowering:
tree building and jump table or bit tests finding are now easier to tweak
separately.

For example, this will enable us to balance the tree based on profile info
in the future.

The algorithm for finding jump tables is O(n^2), whereas the previous algorithm
was O(n log n) for common cases, and quadratic only in the worst-case. This
doesn't seem to be major problem in practice, e.g. compiling a file consisting
of a 10k-case switch was only 30% slower, and such large switches should be rare
in practice. Compiling e.g. gcc.c showed no compile-time difference.  If this
does turn out to be a problem, we could limit the search space of the algorithm.

This commit also disables all optimizations during switch lowering in -O0.

Differential Revision: http://reviews.llvm.org/D8649

llvm-svn: 235101
2015-04-16 14:49:23 +00:00
..
2002-04-14-UnexpectedUnsignedType.ll
2002-04-16-StackFrameSizeAlignment.ll
2003-05-27-phifcmpd.ll
2003-05-27-useboolinotherbb.ll
2003-05-27-usefsubasbool.ll
2003-05-28-ManyArgs.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2003-05-30-BadFoldGEP.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2003-05-30-BadPreselectPhi.ll
2003-07-06-BadIntCmp.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2003-07-07-BadLongConst.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2003-07-08-BadCastToBool.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2003-07-29-BadConstSbyte.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2004-05-09-LiveVarPartialRegister.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2005-01-18-SetUO-InfLoop.ll
2005-04-09-GlobalInPHI.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2005-10-18-ZeroSizeStackObject.ll
2005-10-21-longlonggtu.ll
2005-12-01-Crash.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2005-12-12-ExpandSextInreg.ll
2006-01-12-BadSetCCFold.ll
2006-01-18-InvalidBranchOpcodeAssert.ll
2006-02-12-InsertLibcall.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2006-03-01-dagcombineinfloop.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2006-04-26-SetCCAnd.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2006-04-28-Sign-extend-bool.ll
2006-05-06-GEP-Cast-Sink-Crash.ll [opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction 2015-02-27 19:29:02 +00:00
2006-06-12-LowerSwitchCrash.ll
2006-06-13-ComputeMaskedBitsCrash.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2006-06-28-SimplifySetCCCrash.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2006-07-03-schedulers.ll
2006-08-30-CoalescerCrash.ll
2006-09-02-LocalAllocCrash.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2006-09-06-SwitchLowering.ll
2006-10-27-CondFolding.ll
2006-10-29-Crash.ll
2006-11-20-DAGCombineCrash.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2007-01-15-LoadSelectCycle.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2007-02-25-invoke.ll
2007-04-08-MultipleFrameIndices.ll Re-commit: Demote EmitRawText call in AsmPrinter::EmitInlineAsm() and remove hasRawTextSupport() call 2014-02-13 14:44:26 +00:00
2007-04-13-SwitchLowerBadPhi.ll
2007-04-17-lsr-crash.ll
2007-04-27-InlineAsm-X-Dest.ll Re-commit: Demote EmitRawText call in AsmPrinter::EmitInlineAsm() and remove hasRawTextSupport() call 2014-02-13 14:44:26 +00:00
2007-04-27-LargeMemObject.ll Re-commit: Demote EmitRawText call in AsmPrinter::EmitInlineAsm() and remove hasRawTextSupport() call 2014-02-13 14:44:26 +00:00
2007-04-30-LandingPadBranchFolding.ll
2007-05-03-EHTypeInfo.ll CodeGen: @llvm.eh.typeid.for replaced @llvm.eh.typeid.for.i32 2015-03-16 21:36:38 +00:00
2007-05-15-InfiniteRecursion.ll
2007-12-17-InvokeAsm.ll Re-commit: Demote EmitRawText call in AsmPrinter::EmitInlineAsm() and remove hasRawTextSupport() call 2014-02-13 14:44:26 +00:00
2007-12-31-UnusedSelector.ll
2008-01-25-dag-combine-mul.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2008-01-30-LoadCrash.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2008-02-04-Ctlz.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2008-02-04-ExtractSubvector.ll
2008-02-20-MatchingMem.ll Unxfail passing test on Hexagon 2015-03-12 20:38:10 +00:00
2008-02-25-NegateZero.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2008-02-26-NegatableCrash.ll
2008-08-07-PtrToInt-SmallerInt.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2009-03-17-LSR-APInt.ll Use "weak alias" instead of "alias weak" 2014-07-30 22:51:54 +00:00
2009-03-29-SoftFloatVectorExtract.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2009-04-10-SinkCrash.ll
2009-04-28-i128-cmp-crash.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2009-11-16-BadKillsCrash.ll
2010-07-27-DAGCombineCrash.ll
2010-11-04-BigByval.ll
2010-ZeroSizedArg.ll
2011-01-06-BigNumberCrash.ll
2011-07-07-ScheduleDAGCrash.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2012-06-08-APIntCrash.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2013-03-20-APFloatCrash.ll Add a test case for PR15318 fixed in r177472 2013-03-20 06:18:06 +00:00
2014-02-05-OpaqueConstants.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
add-with-overflow-24.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
add-with-overflow-128.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
add-with-overflow.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
addr-label.ll
annotate.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
APIntLoadStore.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
APIntParam.ll
APIntSextParam.ll
APIntZextParam.ll
asm-large-immediate.ll Re-commit: Demote EmitRawText call in AsmPrinter::EmitInlineAsm() and remove hasRawTextSupport() call 2014-02-13 14:44:26 +00:00
assume.ll Add @llvm.assume, lowering, and some basic properties 2014-07-25 21:13:35 +00:00
badarg6.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
badCallArgLRLLVM.ll
badFoldGEP.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
BasicInstrs.ll
bool-to-double.ll
builtin-expect.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
call2-ret0.ll
call-ret0.ll
call-ret42.ll
call-void.ll
cast-fp.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
ConstantExprLowering.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
constindices.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
crash.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
dag-combine-crash.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
dbg_value.ll DebugInfo: Add missing !dbg attachments to intrinsics 2015-04-15 21:04:10 +00:00
div-neg-power-2.ll
donothing.ll Fix broken check lines. 2012-08-17 12:28:26 +00:00
edge-bundles-blockIDs.ll Don't run RAFast in the optimizing regalloc pipeline. 2012-06-08 23:15:12 +00:00
empty-insertvalue.ll Fix crash with an insertvalue that produces an empty object. 2014-09-20 00:10:47 +00:00
empty-load-store.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
empty-phi.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
exception-handling.ll
externally_available.ll
fastcall.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
fneg-fabs.ll
fp_to_int.ll
fp-to-int-invalid.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
fpowi-promote.ll
fwdtwice.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
global-ret0.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
hello.ll [opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction 2015-02-27 19:29:02 +00:00
i128-addsub.ll
i128-arith.ll
inline-asm-mem-clobber.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
inline-asm-special-strings.ll Re-commit: Demote EmitRawText call in AsmPrinter::EmitInlineAsm() and remove hasRawTextSupport() call 2014-02-13 14:44:26 +00:00
intrinsics.ll
invalid-memcpy.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
isunord.ll
llvm-ct-intrinsics.ll
MachineBranchProb.ll Switch lowering: extract jump tables and bit tests before building binary tree (PR22262) 2015-04-16 14:49:23 +00:00
Makefile
multiple-return-values-cross-block-with-invoke.ll XFAIL some of the generic CodeGen tests for Hexagon. 2013-03-25 21:04:16 +00:00
negintconst.ll [opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction 2015-02-27 19:29:02 +00:00
nested-select.ll
no-target.ll Fix pr18235. 2013-12-13 16:05:32 +00:00
overflow.ll
overloaded-intrinsic-name.ll Require a GC strategy be specified for functions which use gc.statepoint 2015-03-27 05:09:33 +00:00
PBQP.ll Add a regression test to sanity check the PBQP allocator. 2014-09-03 18:04:10 +00:00
pr2625.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
pr3288.ll
pr12507.ll Don't try to zExt just to check if an integer constant is zero, it might 2012-04-10 00:16:22 +00:00
print-add.ll [opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction 2015-02-27 19:29:02 +00:00
print-after.ll CommandLine: Exit successfully for -version and -help 2014-02-28 19:08:01 +00:00
print-arith-fp.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
print-arith-int.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
print-int.ll [opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction 2015-02-27 19:29:02 +00:00
print-machineinstrs.ll Rename argument strings of codegen passes to avoid collisions with command line 2014-12-13 04:52:04 +00:00
print-mul-exp.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
print-mul.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
print-shift.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
ptr-annotate.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
ret0.ll
ret42.ll
select-cc.ll XFAIL some of the generic CodeGen tests for Hexagon. 2013-03-25 21:04:16 +00:00
select.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
shift-int64.ll
stacksave-restore.ll
stop-after.ll Remove the Forward Control Flow Integrity pass and its dependencies. 2015-02-27 19:03:38 +00:00
storetrunc-fp.ll
switch-lower-feature.ll
switch-lower.ll
trap.ll
undef-phi.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
v-split.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
vector-casts.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
vector-constantexpr.ll
vector-identity-shuffle.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
vector.ll Unxfail test/CodeGen/Generic/vector.ll now passing on Hexagon 2015-03-19 20:22:17 +00:00
zero-sized-array.ll