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David Majnemer e0134d95cc InstCombine: Annotate sub with nsw when we prove it's safe 
We can prove that a 'sub' can be a 'sub nsw' under certain conditions:
- The sign bits of the operands is the same.
- Both operands have more than 1 sign bit.

The subtraction cannot be a signed overflow in either case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216037 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-19 23:36:30 +00:00
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2002-03-11-InstCombineHang.ll
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2002-05-14-SubFailure.ll
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2002-08-02-CastTest.ll
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2002-12-05-MissedConstProp.ll
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2003-05-26-CastMiscompile.ll
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2003-09-09-VolatileLoadElim.ll
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2003-10-29-CallSiteResolve.ll
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2003-11-03-VarargsCallBug.ll
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2004-01-13-InstCombineInvokePHI.ll
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2004-02-23-ShiftShiftOverflow.ll
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2004-03-13-InstCombineInfLoop.ll
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2004-04-04-InstCombineReplaceAllUsesWith.ll
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2004-05-07-UnsizedCastLoad.ll
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2004-08-09-RemInfLoop.ll
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2004-12-08-RemInfiniteLoop.ll
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2005-03-04-ShiftOverflow.ll
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2005-04-07-UDivSelectCrash.ll
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2005-06-15-DivSelectCrash.ll
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2005-07-07-DeadPHILoop.ll
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2006-02-13-DemandedMiscompile.ll
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2006-03-30-ExtractElement.ll
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2006-04-28-ShiftShiftLongLong.ll
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2006-05-04-DemandedBitCrash.ll
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2006-09-15-CastToBool.ll
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2006-10-19-SignedToUnsignedCastAndConst-2.ll
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2006-10-20-mask.ll
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2006-10-26-VectorReassoc.ll
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2006-11-10-ashr-miscompile.ll
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2006-12-01-BadFPVectorXform.ll
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2006-12-05-fp-to-int-ext.ll
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2006-12-08-Phi-ICmp-Op-Fold.ll
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2006-12-08-Select-ICmp.ll
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2006-12-15-Range-Test.ll
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2006-12-23-Select-Cmp-Cmp.ll
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2007-01-13-ExtCompareMiscompile.ll
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2007-01-14-FcmpSelf.ll
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2007-01-18-VectorInfLoop.ll
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2007-01-27-AndICmp.ll
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2007-02-01-LoadSinkAlloca.ll
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2007-02-07-PointerCast.ll
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2007-02-23-PhiFoldInfLoop.ll
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2007-03-13-CompareMerge.ll
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2007-03-19-BadTruncChangePR1261.ll
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2007-03-21-SignedRangeTest.ll
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2007-03-25-BadShiftMask.ll
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2007-03-25-DoubleShift.ll
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2007-03-26-BadShiftMask.ll
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2007-04-08-SingleEltVectorCrash.ll
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2007-05-10-icmp-or.ll
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2007-05-14-Crash.ll
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2007-05-18-CastFoldBug.ll
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2007-06-06-AshrSignBit.ll
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2007-06-21-DivCompareMiscomp.ll
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2007-08-02-InfiniteLoop.ll
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2007-09-10-AliasConstFold.ll
Use "weak alias" instead of "alias weak"
2014-07-30 22:51:54 +00:00
2007-09-17-AliasConstFold2.ll
Use "weak alias" instead of "alias weak"
2014-07-30 22:51:54 +00:00
2007-10-10-EliminateMemCpy.ll
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2007-10-12-Crash.ll
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2007-10-28-stacksave.ll
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2007-10-31-RangeCrash.ll
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2007-10-31-StringCrash.ll
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2007-11-07-OpaqueAlignCrash.ll
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2007-11-15-CompareMiscomp.ll
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2007-11-22-IcmpCrash.ll
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2007-11-25-CompatibleAttributes.ll
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2007-12-10-ConstFoldCompare.ll
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2007-12-12-GEPScale.ll
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2007-12-16-AsmNoUnwind.ll
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2007-12-18-AddSelCmpSub.ll
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2007-12-28-IcmpSub2.ll
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2008-01-06-BitCastAttributes.ll
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2008-01-06-CastCrash.ll
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2008-01-06-VoidCast.ll
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2008-01-13-AndCmpCmp.ll
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2008-01-13-NoBitCastAttributes.ll
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2008-01-14-VarArgTrampoline.ll
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2008-01-21-MismatchedCastAndCompare.ll
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2008-01-21-MulTrunc.ll
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2008-01-27-FloatSelect.ll
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2008-01-29-AddICmp.ll
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2008-02-13-MulURem.ll
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2008-02-16-SDivOverflow2.ll
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2008-02-16-SDivOverflow.ll
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2008-02-23-MulSub.ll
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2008-02-28-OrFCmpCrash.ll
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2008-03-13-IntToPtr.ll
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2008-04-22-ByValBitcast.ll
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2008-04-28-VolatileStore.ll
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2008-04-29-VolatileLoadDontMerge.ll
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2008-04-29-VolatileLoadMerge.ll
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2008-05-08-LiveStoreDelete.ll
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2008-05-08-StrLenSink.ll
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2008-05-09-SinkOfInvoke.ll
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2008-05-17-InfLoop.ll
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2008-05-18-FoldIntToPtr.ll
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2008-05-22-IDivVector.ll
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2008-05-22-NegValVector.ll
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2008-05-23-CompareFold.ll
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2008-05-31-AddBool.ll
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2008-05-31-Bools.ll
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2008-06-05-ashr-crash.ll
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2008-06-08-ICmpPHI.ll
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2008-06-13-InfiniteLoopStore.ll
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2008-06-13-ReadOnlyCallStore.ll
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2008-06-19-UncondLoad.ll
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2008-06-21-CompareMiscomp.ll
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2008-06-24-StackRestore.ll
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2008-07-08-AndICmp.ll
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2008-07-08-ShiftOneAndOne.ll
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2008-07-08-SubAnd.ll
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2008-07-08-VolatileLoadMerge.ll
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2008-07-09-SubAndError.ll
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2008-07-10-CastSextBool.ll
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2008-07-10-ICmpBinOp.ll
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2008-07-11-RemAnd.ll
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2008-07-13-DivZero.ll
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2008-07-16-fsub.ll
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2008-07-16-sse2_storel_dq.ll
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2008-08-05-And.ll
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2008-08-17-ICmpXorSignbit.ll
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2008-09-02-VectorCrash.ll
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2008-09-29-FoldingOr.ll
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2008-10-11-DivCompareFold.ll
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2008-10-23-ConstFoldWithoutMask.ll
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2008-11-01-SRemDemandedBits.ll
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2008-11-08-FCmp.ll
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2008-11-20-DivMulRem.ll
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2008-11-27-IDivVector.ll
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2008-11-27-MultiplyIntVec.ll
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2008-11-27-UDivNegative.ll
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2008-12-17-SRemNegConstVec.ll
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2009-01-05-i128-crash.ll
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2009-01-08-AlignAlloca.ll
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2009-01-16-PointerAddrSpace.ll
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2009-01-19-fmod-constant-float-specials.ll
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2009-01-19-fmod-constant-float.ll
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2009-01-24-EmptyStruct.ll
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2009-01-31-InfIterate.ll
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2009-01-31-Pressure.ll
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2009-02-04-FPBitcast.ll
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2009-02-11-NotInitialized.ll
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2009-02-20-InstCombine-SROA.ll
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2009-02-21-LoadCST.ll
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2009-02-25-CrashZeroSizeArray.ll
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2009-03-18-vector-ashr-crash.ll
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2009-03-20-AShrOverShift.ll
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2009-03-24-InfLoop.ll
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2009-04-07-MulPromoteToI96.ll
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2009-05-23-FCmpToICmp.ll
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2009-06-11-StoreAddrSpace.ll
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2009-06-16-SRemDemandedBits.ll
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2009-07-02-MaskedIntVector.ll
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2009-12-17-CmpSelectNull.ll
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2010-01-28-NegativeSRem.ll
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2010-03-03-ExtElim.ll
IR: Fold away compares between GV GEPs and GVs
2014-07-04 22:05:26 +00:00
2010-05-30-memcpy-Struct.ll
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2010-11-01-lshr-mask.ll
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2010-11-21-SizeZeroTypeGEP.ll
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2010-11-23-Distributed.ll
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2011-02-14-InfLoop.ll
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2011-03-08-SRemMinusOneBadOpt.ll
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2011-05-02-VectorBoolean.ll
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2011-05-13-InBoundsGEP.ll
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2011-05-28-swapmulsub.ll
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2011-06-13-nsw-alloca.ll
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2011-09-03-Trampoline.ll
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2011-10-07-AlignPromotion.ll
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2012-3-15-or-xor-constant.ll
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2012-6-7-vselect-bitcast.ll
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2012-01-11-OpaqueBitcastCrash.ll
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2012-02-13-FCmp.ll
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2012-02-28-ICmp.ll
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2012-03-10-InstCombine.ll
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2012-04-23-Neon-Intrinsics.ll
AArch64/ARM64: move ARM64 into AArch64's place
2014-05-24 12:50:23 +00:00
2012-04-24-vselect.ll
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2012-04-30-SRem.ll
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2012-05-27-Negative-Shift-Crash.ll
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2012-05-28-select-hang.ll
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2012-06-06-LoadOfPHIs.ll
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2012-07-25-LoadPart.ll
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2012-07-30-addrsp-bitcast.ll
Allow aliases to be unnamed_addr.
2014-06-06 01:20:28 +00:00
2012-08-28-udiv_ashl.ll
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2012-09-17-ZeroSizedAlloca.ll
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2012-09-24-MemcpyFromGlobalCrash.ll
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2012-10-25-vector-of-pointers.ll
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2012-12-14-simp-vgep.ll
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2013-03-05-Combine-BitcastTy-Into-Alloca.ll
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abs_abs.ll
This removes TODO added in http://reviews.llvm.org/D3658
2014-06-12 14:06:00 +00:00
abs-1.ll
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add2.ll
InstCombine: Combine (add (and %a, %b) (or %a, %b)) to (add %a, %b)
2014-08-11 22:32:02 +00:00
add3.ll
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add-shrink.ll
Convert test to FileCheck.
2014-06-02 21:23:54 +00:00
add-sitofp.ll
[InstCombine] mark ADD with nuw if no unsigned overflow
2014-06-17 00:42:07 +00:00
add.ll
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addnegneg.ll
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AddOverFlow.ll
[ValueTracking] Extend range metadata to call/invoke
2014-06-19 16:50:16 +00:00
addrspacecast.ll
InstCombine: Canonicalize addrspacecast between different element types
2014-06-06 21:52:55 +00:00
adjust-for-sminmax.ll
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align-2d-gep.ll
Make instsimplify's analysis of icmp eq/ne use computeKnownBits to determine whether the icmp is always true or false. Patch by Suyog Sarda!
2014-06-19 03:35:49 +00:00
align-addr.ll
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align-attr.ll
Make use of the align parameter attribute for all pointer arguments
2014-07-22 16:58:55 +00:00
align-external.ll
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alloca.ll
InstCombine: don't drop 'inalloca' in PromoteCastOfAllocation (PR19569)
2014-04-28 17:40:03 +00:00
and2.ll
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and-compare.ll
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and-fcmp.ll
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and-not-or.ll
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and-or-and.ll
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and-or-not.ll
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and-or.ll
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and-xor-merge.ll
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and-xor-or.ll
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and.ll
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apint-add1.ll
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apint-add2.ll
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apint-and1.ll
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apint-and2.ll
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apint-and-compare.ll
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apint-and-or-and.ll
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apint-and-xor-merge.ll
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apint-call-cast-target.ll
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apint-cast-and-cast.ll
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apint-cast-cast-to-and.ll
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apint-cast.ll
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apint-div1.ll
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apint-div2.ll
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apint-mul1.ll
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apint-mul2.ll
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apint-not.ll
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apint-or1.ll
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apint-or2.ll
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apint-rem1.ll
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apint-rem2.ll
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apint-select.ll
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apint-shift-simplify.ll
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apint-shift.ll
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apint-shl-trunc.ll
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apint-sub.ll
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apint-xor1.ll
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apint-xor2.ll
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apint-zext1.ll
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apint-zext2.ll
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assume.ll
Canonicalization for @llvm.assume
2014-07-25 21:45:17 +00:00
atomic.ll
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badmalloc.ll
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binop-cast.ll
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bit-checks.ll
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bit-tracking.ll
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bitcast-alias-function.ll
Allow alias to point to an arbitrary ConstantExpr.
2014-06-03 02:41:57 +00:00
bitcast-bigendian.ll
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bitcast-sext-vector.ll
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bitcast-store.ll
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bitcast-vec-canon.ll
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bitcast-vec-uniform.ll
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bitcast-vector-fold.ll
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bitcast.ll
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bitcount.ll
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bittest.ll
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blend_x86.ll
Post-commit fixes for r209643
2014-05-27 16:54:33 +00:00
bswap-fold.ll
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bswap.ll
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call2.ll
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call-cast-target-inalloca.ll
IR: Conservatively verify inalloca arguments
2014-04-30 17:22:00 +00:00
call-cast-target.ll
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call-intrinsics.ll
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call.ll
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canonicalize_branch.ll
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cast_ptr.ll
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cast-call-combine.ll
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cast-mul-select.ll
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cast-set.ll
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cast.ll
Allwo bitcast + struct GEP transform to work with addrspacecast
2014-08-12 19:46:13 +00:00
ceil.ll
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compare-signs.ll
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constant-expr-datalayout.ll
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constant-fold-address-space-pointer.ll
Canonicalize addrspacecast ConstExpr between different pointer types
2014-06-15 21:40:57 +00:00
constant-fold-compare.ll
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constant-fold-gep.ll
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constant-fold-math.ll
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copysign.ll
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cos-1.ll
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cos-2.ll
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CPP_min_max.ll
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crash.ll
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dce-iterate.ll
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deadcode.ll
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debug-line.ll
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debuginfo.ll
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descale-zero.ll
InstCombine: Fix a crash in Descale for multiply-by-zero
2014-07-10 17:13:27 +00:00
devirt.ll
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disable-simplify-libcalls.ll
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distribute.ll
This patch removed duplicate code for matching patterns
2014-06-26 08:57:33 +00:00
div-shift-crash.ll
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div-shift.ll
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div.ll
InstCombine: Combine mul with div.
2014-08-16 08:55:06 +00:00
double-float-shrink-1.ll
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double-float-shrink-2.ll
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enforce-known-alignment.ll
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err-rep-cold.ll
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exact.ll
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exp2-1.ll
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exp2-2.ll
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ExtractCast.ll
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extractvalue.ll
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fast-math.ll
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fcmp-select.ll
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fcmp-special.ll
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fcmp.ll
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fdiv.ll
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ffs-1.ll
[InstCombine] mark ADD with nuw if no unsigned overflow
2014-06-17 00:42:07 +00:00
float-shrink-compare.ll
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fmul.ll
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fneg-ext.ll
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fold-bin-operand.ll
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fold-calls.ll
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fold-fops-into-selects.ll
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fold-phi.ll
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fold-sqrt-sqrtf.ll
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fold-vector-select.ll
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fold-vector-zero.ll
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fp-ret-bitcast.ll
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fpcast.ll
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fpextend_x86.ll
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fpextend.ll
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fprintf-1.ll
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fputs-1.ll
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fsub.ll
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fwrite-1.ll
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gep-addrspace.ll
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gepgep.ll
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gepphigep.ll
Add support for combining GEPs across PHI nodes
2014-05-29 20:29:47 +00:00
getelementptr.ll
Allwo bitcast + struct GEP transform to work with addrspacecast
2014-08-12 19:46:13 +00:00
hoist_instr.ll
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icmp-logical.ll
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icmp-shr.ll
This patch implements optimization as mentioned in PR19753: Optimize comparisons with "ashr/lshr exact" of a constanst.
2014-07-22 19:19:36 +00:00
icmp.ll
Look through addrspacecasts when turning ptr comparisons into
2014-06-09 19:20:29 +00:00
idioms.ll
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insert-extract-shuffle.ll
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IntPtrCast.ll
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intrinsics.ll
InstCombine: Strength reduce sadd.with.overflow into a regular nsw add if we can prove that it cannot overflow.
2014-07-04 10:22:21 +00:00
invariant.ll
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invoke.ll
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isascii-1.ll
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isdigit-1.ll
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JavaCompare.ll
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known_align.ll
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LandingPadClauses.ll
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load3.ll
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load-addrspace-cast.ll
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load-cmp.ll
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load-select.ll
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load.ll
Convert test to FileCheck.
2014-07-15 00:07:27 +00:00
loadstore-alignment.ll
Teach computeKnownBits to look through addrspacecast.
2014-07-15 01:55:03 +00:00
logical-select.ll
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lshr-phi.ll
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malloc-free-delete.ll
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memcmp-1.ll
InstCombine: Annotate sub with nsw when we prove it's safe
2014-08-19 23:36:30 +00:00
memcmp-2.ll
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memcpy_chk-1.ll
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memcpy_chk-2.ll
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memcpy-1.ll
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memcpy-2.ll
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memcpy-from-global.ll
InstCombine: Canonicalize addrspacecast between different element types
2014-06-06 21:52:55 +00:00
memcpy-to-load.ll
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memcpy.ll
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memmove_chk-1.ll
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memmove_chk-2.ll
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memmove-1.ll
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memmove-2.ll
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memmove.ll
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memset2.ll
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memset_chk-1.ll
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memset_chk-2.ll
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memset-1.ll
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memset-2.ll
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memset.ll
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merge-icmp.ll
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mul-masked-bits.ll
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mul.ll
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multi-size-address-space-pointer.ll
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multi-use-or.ll
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narrow.ll
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neon-intrinsics.ll
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no-negzero.ll
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not-fcmp.ll
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not.ll
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nothrow.ll
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nsw.ll
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obfuscated_splat.ll
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objsize-64.ll
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objsize-address-space.ll
Use "weak alias" instead of "alias weak"
2014-07-30 22:51:54 +00:00
objsize.ll
Use "weak alias" instead of "alias weak"
2014-07-30 22:51:54 +00:00
odr-linkage.ll
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onehot_merge.ll
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or-fcmp.ll
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or-to-xor.ll
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or-xor.ll
InstCombine: ((A & ~B) ^ (~A & B)) to A ^ B
2014-08-19 08:19:19 +00:00
or.ll
Added InstCombine Transform for ((B | C) & A) | B -> B | (A & C)
2014-08-14 06:41:38 +00:00
osx-names.ll
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overflow-mul.ll
InstCombine: Disable umul.with.overflow recognition for vectors.
2014-06-24 10:47:52 +00:00
overflow.ll
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OverlappingInsertvalues.ll
[InstCombine] Some cleanup in optimization of redundant insertvalue instructions.
2014-05-08 19:50:24 +00:00
phi-merge-gep.ll
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phi-select-constexpr.ll
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phi.ll
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pow-1.ll
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pow-2.ll
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pow-3.ll
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pr2645-0.ll
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pr2645-1.ll
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pr2996.ll
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pr8547.ll
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pr12251.ll
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pr12338.ll
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pr17827.ll
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pr19420.ll
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pr20059.ll
removed duplicate testcase
2014-07-09 17:49:58 +00:00
pr20079.ll
IR: Fold away compares between GV GEPs and GVs
2014-07-04 22:05:26 +00:00
PR7357.ll
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preserve-sminmax.ll
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printf-1.ll
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printf-2.ll
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ptr-int-cast.ll
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puts-1.ll
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r600-intrinsics.ll
R600/SI: Add intrinsics for various math instructions.
2014-06-19 01:19:19 +00:00
README.txt
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rem.ll
Add back commit r210029.
2014-06-02 22:01:04 +00:00
round.ll
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sdiv-1.ll
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sdiv-2.ll
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select-2.ll
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select-crash.ll
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select-extractelement.ll
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select-load-call.ll
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select-select.ll
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select.ll
[InstCombine] mark ADD with nuw if no unsigned overflow
2014-06-17 00:42:07 +00:00
set.ll
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setcc-strength-reduce.ll
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sext.ll
Add back commit r210029.
2014-06-02 22:01:04 +00:00
shift-sra.ll
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shift.ll
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shufflemask-undef.ll
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shufflevec-constant.ll
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sign-test-and-or.ll
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signed-comparison.ll
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signext.ll
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simplify-demanded-bits-pointer.ll
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simplify-libcalls.ll
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sincospi.ll
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sink_instruction.ll
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sitofp.ll
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sprintf-1.ll
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sqrt.ll
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srem1.ll
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srem-simplify-bug.ll
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srem.ll
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stack-overalign.ll
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stacksaverestore.ll
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store.ll
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stpcpy_chk-1.ll
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stpcpy_chk-2.ll
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stpcpy-1.ll
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stpcpy-2.ll
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strcat-1.ll
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strcat-2.ll
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strcat-3.ll
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strchr-1.ll
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strchr-2.ll
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strcmp-1.ll
InstCombine: Annotate sub with nsw when we prove it's safe
2014-08-19 23:36:30 +00:00
strcmp-2.ll
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strcpy_chk-1.ll
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strcpy_chk-2.ll
…
strcpy_chk-64.ll
…
strcpy-1.ll
…
strcpy-2.ll
…
strcspn-1.ll
…
strcspn-2.ll
…
strlen-1.ll
Fold strlen(expr ? "str1" : "str2") to x ? len1 : len2. This fires about 330 times in a bootstrap of clang.
2014-05-02 04:11:45 +00:00
strlen-2.ll
…
strncat-1.ll
…
strncat-2.ll
…
strncat-3.ll
…
strncmp-1.ll
InstCombine: Annotate sub with nsw when we prove it's safe
2014-08-19 23:36:30 +00:00
strncmp-2.ll
…
strncpy_chk-1.ll
…
strncpy_chk-2.ll
…
strncpy-1.ll
…
strncpy-2.ll
…
strpbrk-1.ll
…
strpbrk-2.ll
…
strrchr-1.ll
…
strrchr-2.ll
…
strspn-1.ll
…
strstr-1.ll
…
strstr-2.ll
…
strto-1.ll
…
struct-assign-tbaa.ll
…
sub-xor.ll
InstCombine: Annotate sub with nsw when we prove it's safe
2014-08-19 23:36:30 +00:00
sub.ll
InstCombine: Annotate sub with nsw when we prove it's safe
2014-08-19 23:36:30 +00:00
toascii-1.ll
…
trunc.ll
…
udiv_select_to_select_shift.ll
…
udiv-simplify-bug-0.ll
…
udiv-simplify-bug-1.ll
…
udivrem-change-width.ll
…
urem-simplify-bug.ll
…
urem.ll
…
vec_demanded_elts.ll
Also handle ConstantAggregateZero when optimizing vpermilvar*.
2014-04-29 22:20:40 +00:00
vec_extract_2elts.ll
…
vec_extract_elt.ll
…
vec_extract_var_elt.ll
…
vec_insertelt.ll
…
vec_narrow.ll
…
vec_phi_extract.ll
…
vec_sext.ll
…
vec_shuffle.ll
InstCombine: Don't try to reorder shuffles where the mask is a ConstantExpr.
2014-06-24 10:38:10 +00:00
vector_gep1.ll
…
vector_gep2.ll
…
vector-casts.ll
…
vector-mul.ll
…
vector-srem.ll
…
vector-type.ll
…
volatile_store.ll
…
weak-symbols.ll
…
win-math.ll
…
x86-crc32-demanded.ll
…
xor2.ll
This patch implements transform for pattern "(A & ~B) ^ (~A) -> ~(A & B)".
2014-08-01 05:07:20 +00:00
xor-undef.ll
…
xor.ll
…
zero-point-zero-add.ll
…
zeroext-and-reduce.ll
…
zext-bool-add-sub.ll
Add back commit r210029.
2014-06-02 22:01:04 +00:00
zext-fold.ll
…
zext-or-icmp.ll
…
zext.ll
…

README.txt 

This directory contains test cases for the instcombine transformation.  The
dated tests are actual bug tests, whereas the named tests are used to test
for features that the this pass should be capable of performing.