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8f90b6eb2f
llvm-6502/include/llvm
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Evan Cheng 8f90b6eb2f The coalescer does not coalesce a virtual register to a physical register if any of the physical register's sub-register live intervals overlaps with the virtual register. This is overly conservative. It prevents a extract_subreg from being coalesced away: 
v1024 = EDI  // not killed
      =
      = EDI

One possible solution is for the coalescer to examine the sub-register live intervals in the same manner as the physical register. Another possibility is to examine defs and uses (when needed) of sub-registers. Both solutions are too expensive. For now, look for "short virtual intervals" and scan instructions to look for conflict instead.

This is a small win on x86-64. e.g. It shaves 403.gcc by ~80 instructions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61847 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-07 02:08:57 +00:00
..
ADT Tidy up #includes, deleting a bunch of unnecessary #includes. 2009-01-05 17:59:02 +00:00
Analysis Extract source location info from DebugInfo. 2009-01-05 22:35:52 +00:00
Assembly Reimplement the old and horrible bison parser for .ll files with a nice 2009-01-02 07:01:27 +00:00
Bitcode Add support for writing LLVM IR to a specified BitstreamWriter. 2008-12-19 18:37:59 +00:00
CodeGen The coalescer does not coalesce a virtual register to a physical register if any of the physical register's sub-register live intervals overlaps with the virtual register. This is overly conservative. It prevents a extract_subreg from being coalesced away: 2009-01-07 02:08:57 +00:00
CompilerDriver Tidy up #includes, deleting a bunch of unnecessary #includes. 2009-01-05 17:59:02 +00:00
Config Tidy up #includes, deleting a bunch of unnecessary #includes. 2009-01-05 17:59:02 +00:00
Debugger Tidy up #includes, deleting a bunch of unnecessary #includes. 2009-01-05 17:59:02 +00:00
ExecutionEngine Tidy up #includes, deleting a bunch of unnecessary #includes. 2009-01-05 17:59:02 +00:00
Support no need to negate the APInt for 0. 2009-01-06 00:06:25 +00:00
System Update the stub and callback code to handle lazy compilation. The stub 2008-10-20 21:39:23 +00:00
Target Revert r61415 and r61484. Duncan was correct that these weren't needed. 2009-01-05 22:53:45 +00:00
Transforms Tidy up #includes, deleting a bunch of unnecessary #includes. 2009-01-05 17:59:02 +00:00
AbstractTypeUser.h implement simplify_type for PATypeHolder so that isa<FooType>(PATypeHolder) 2008-12-27 07:47:40 +00:00
Argument.h Don't analyze arguments already marked 'nocapture'. 2008-12-31 18:08:59 +00:00
Attributes.h Add a new Attribute::getAlignmentFromAttrs method. 2008-12-31 08:41:38 +00:00
AutoUpgrade.h Tidy up #includes, deleting a bunch of unnecessary #includes. 2009-01-05 17:59:02 +00:00
BasicBlock.h fix grammar, thanks Duncan! 2008-12-11 11:44:49 +00:00
CallGraphSCCPass.h Tidy up several unbeseeming casts from pointer to intptr_t. 2008-09-04 17:05:41 +00:00
CallingConv.h Add "inreg" field to CallSDNode (doesn't increase 2008-09-26 19:31:26 +00:00
CMakeLists.txt CMake: Adds header and TableGen files to Visual Studio solution. A new 2008-11-15 02:08:08 +00:00
Constant.h fix typo's 2008-10-13 10:28:12 +00:00
Constants.h Reword the comment for ConstantInt's getLimitedValue. 2008-12-20 17:06:39 +00:00
DerivedTypes.h Improve support for type-generic vector intrinsics by teaching TableGen how 2009-01-07 00:09:01 +00:00
Function.h Add utility functions for marking parameters as noalias or nocapture. 2009-01-04 18:21:35 +00:00
GlobalAlias.h Tidy up #includes, deleting a bunch of unnecessary #includes. 2009-01-05 17:59:02 +00:00
GlobalValue.h Rename isWeakForLinker to mayBeOverridden. Use it 2008-09-29 11:25:42 +00:00
GlobalVariable.h Tidy up #includes, deleting a bunch of unnecessary #includes. 2009-01-05 17:59:02 +00:00
InlineAsm.h Keep track of *which* input constraint matches an output 2008-10-17 16:47:46 +00:00
InstrTypes.h Use the opcode predicates, instead of duplicating the code. 2008-10-17 21:42:45 +00:00
Instruction.def Cosmetic. 2008-10-06 20:33:02 +00:00
Instruction.h improve const correctness. 2008-11-27 08:39:18 +00:00
Instructions.h Tidy up #includes, deleting a bunch of unnecessary #includes. 2009-01-05 17:59:02 +00:00
IntrinsicInst.h reapply Sanjiv's patch to genericize memcpy/memset/memmove to take an 2008-11-21 16:42:48 +00:00
Intrinsics.h Large mechanical patch. 2008-09-25 21:00:45 +00:00
Intrinsics.td Improve support for type-generic vector intrinsics by teaching TableGen how 2009-01-07 00:09:01 +00:00
IntrinsicsAlpha.td Modify the intrinsics pattern to separate out the "return" types from the 2008-11-13 09:08:33 +00:00
IntrinsicsARM.td Modify the intrinsics pattern to separate out the "return" types from the 2008-11-13 09:08:33 +00:00
IntrinsicsCellSPU.td Modify the intrinsics pattern to separate out the "return" types from the 2008-11-13 09:08:33 +00:00
IntrinsicsPowerPC.td Modify the intrinsics pattern to separate out the "return" types from the 2008-11-13 09:08:33 +00:00
IntrinsicsX86.td Modify the intrinsics pattern to separate out the "return" types from the 2008-11-13 09:08:33 +00:00
IntrinsicsXCore.td Add XCore intrinsics for getid (returns thread id) and bitrev (reverses 2008-11-14 10:12:16 +00:00
LinkAllPasses.h Rename AddReadAttrs to FunctionAttrs, and teach it how 2008-12-31 16:14:43 +00:00
LinkAllVMCore.h opt was not exporting the Mangler symbols 2008-11-05 22:42:50 +00:00
Linker.h * Alphabetized system headers per the style guide 2009-01-02 20:26:30 +00:00
Module.h Add a mechanism to specify attributes in getOrInsertFunction. 2009-01-04 22:54:40 +00:00
ModuleProvider.h
OperandTraits.h
Pass.h Tidy up #includes, deleting a bunch of unnecessary #includes. 2009-01-05 17:59:02 +00:00
PassAnalysisSupport.h
PassManager.h
PassManagers.h Tidy up #includes, deleting a bunch of unnecessary #includes. 2009-01-05 17:59:02 +00:00
PassSupport.h
SymbolTableListTraits.h
Type.h add a new form of Type::dump that takes a module for type names, 2008-10-01 20:16:19 +00:00
TypeSymbolTable.h Tidy up #includes, deleting a bunch of unnecessary #includes. 2009-01-05 17:59:02 +00:00
Use.h eliminate tabs from my previous commit 2009-01-05 16:28:14 +00:00
User.h Do not allow a user to set the operand for a constant. 2008-10-28 17:22:40 +00:00
Value.h Comment typeo fix, thanks Duncan! 2008-12-02 18:33:11 +00:00
ValueSymbolTable.h