Duncan Sands 593faa53fa My auto-simplifier noticed that ((X/Y)*Y)/Y occurs several times in SPEC ... benchmarks, and that it can be simplified to X/Y. (In general you can only simplify (Z*Y)/Y to Z if the multiplication did not overflow; if Z has the form "X/Y" then this is the case). This patch implements that transform and moves some Div logic out of instcombine and into InstructionSimplify. Unfortunately instcombine gets in the way somewhat, since it likes to change (X/Y)*Y into X-(X rem Y), so I had to teach instcombine about this too. Finally, thanks to the NSW/NUW flags, sometimes we know directly that "Z*Y" does not overflow, because the flag says so, so I added that logic too. This eliminates a bunch of divisions and subtractions in 447.dealII, and has good effects on some other benchmarks too. It seems to have quite an effect on tramp3d-v4 but it's hard to say if it's good or bad because inlining decisions changed, resulting in massive changes all over. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124487 91177308-0d34-0410-b5e6-96231b3b80d8		2011-01-28 16:51:11 +00:00
..
ADT	Add DenseSet::resize for API parity with DenseMap::resize.	2011-01-27 09:10:42 +00:00
Analysis	My auto-simplifier noticed that ((X/Y)*Y)/Y occurs several times in SPEC	2011-01-28 16:51:11 +00:00
Assembly
Bitcode	UnRevert "Revert "Archive: Replace all internal uses of PathV1 with PathV2. The external API still uses PathV1.""	2011-01-16 23:39:59 +00:00
CodeGen	[AVX] Add INSERT_SUBVECTOR and support it on x86. This provides a	2011-01-26 19:13:22 +00:00
CompilerDriver
Config	Handles libffi on the CMake build.	2011-01-21 15:42:54 +00:00
ExecutionEngine
MC	Add support for the --noexecstack option.	2011-01-23 17:55:27 +00:00
Object	Object: Fix type punned pointer issues by making DataRefImpl a union and using intptr_t.	2011-01-21 02:27:02 +00:00
Support	Delay the creation of eh_frame so that the user can change the defaults.	2011-01-23 05:43:40 +00:00
Target	Introduce virtual ParseRegister method in TargetAsmParser.	2011-01-27 17:14:22 +00:00
Transforms	Remove outdated references to dominance frontiers.	2011-01-18 03:53:26 +00:00
AbstractTypeUser.h
Argument.h
Attributes.h
AutoUpgrade.h
BasicBlock.h
CallGraphSCCPass.h
CallingConv.h	Adding target specific calling conventions to support the MBlaze GCC function	2010-12-15 20:14:09 +00:00
CMakeLists.txt
Constant.h
Constants.h	Remove casts between Value** and Constant**, which won't work if a	2011-01-14 08:07:43 +00:00
DerivedTypes.h
Function.h
GlobalAlias.h	FixedNumOperandTraits and VariadicOperandTraits assumed that, given a	2011-01-11 15:07:38 +00:00
GlobalValue.h	First step in fixing PR8927:	2011-01-08 16:42:36 +00:00
GlobalVariable.h	FixedNumOperandTraits and VariadicOperandTraits assumed that, given a	2011-01-11 15:07:38 +00:00
GVMaterializer.h
InitializePasses.h	Remove outdated references to dominance frontiers.	2011-01-18 03:53:26 +00:00
InlineAsm.h	Do not model all INLINEASM instructions as having unmodelled side effects.	2011-01-07 23:50:32 +00:00
InstrTypes.h	FixedNumOperandTraits and VariadicOperandTraits assumed that, given a	2011-01-11 15:07:38 +00:00
Instruction.def
Instruction.h	There is no need for isAssociative to take the type as an argument anymore.	2010-12-20 13:10:23 +00:00
Instructions.h	Remove casts between Value** and Constant**, which won't work if a	2011-01-14 08:07:43 +00:00
IntrinsicInst.h	Teach LazyValueInfo that allocas aren't NULL. Over all of llvm-test, this saves	2011-01-15 09:16:12 +00:00
Intrinsics.h
Intrinsics.td
IntrinsicsAlpha.td
IntrinsicsARM.td	Add Neon VCVT instructions for f32 <-> f16 conversions.	2010-12-15 22:14:12 +00:00
IntrinsicsCellSPU.td
IntrinsicsPowerPC.td
IntrinsicsX86.td
IntrinsicsXCore.td
LinkAllPasses.h	remove the partial specialization pass. It is unmaintained and has bugs.	2011-01-16 00:27:10 +00:00
LinkAllVMCore.h
Linker.h
LLVMContext.h
Metadata.h
Module.h
OperandTraits.h	OperandTraits<>::Layout isn't used for anything. Remove it.	2011-01-14 18:41:56 +00:00
Operator.h
Pass.h
PassAnalysisSupport.h
PassManager.h
PassManagers.h
PassRegistry.h
PassSupport.h
SymbolTableListTraits.h
Type.h
TypeSymbolTable.h
Use.h	Add missing include for ptrdiff_t. Patch by Joerg Sonnenberger!	2011-01-28 03:52:25 +00:00
User.h	Simplify User::operator delete().	2011-01-26 21:56:10 +00:00
Value.h	Revert r122114 (CallbackVH observing use-list changes) because it caused severe slowdowns on the Linux self-host configuration.	2010-12-20 22:28:03 +00:00
ValueSymbolTable.h