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llvm-project/llvm/lib/Target/AArch64
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Jun Bum Lim 2ecb7ba4c6 [CodeGen] Add a new pass for PostRA sink 
Summary:
This pass sinks COPY instructions into a successor block, if the COPY is not
used in the current block and the COPY is live-in to a single successor
(i.e., doesn't require the COPY to be duplicated).  This avoids executing the
the copy on paths where their results aren't needed.  This also exposes
additional opportunites for dead copy elimination and shrink wrapping.

These copies were either not handled by or are inserted after the MachineSink
pass. As an example of the former case, the MachineSink pass cannot sink
COPY instructions with allocatable source registers; for AArch64 these type
of copy instructions are frequently used to move function parameters (PhyReg)
into virtual registers in the entry block..

For the machine IR below, this pass will sink %w19 in the entry into its
successor (%bb.1) because %w19 is only live-in in %bb.1.

```
   %bb.0:
      %wzr = SUBSWri %w1, 1
      %w19 = COPY %w0
      Bcc 11, %bb.2
    %bb.1:
      Live Ins: %w19
      BL @fun
      %w0 = ADDWrr %w0, %w19
      RET %w0
    %bb.2:
      %w0 = COPY %wzr
      RET %w0
```
As we sink %w19 (CSR in AArch64) into %bb.1, the shrink-wrapping pass will be
able to see %bb.0 as a candidate.

With this change I observed 12% more shrink-wrapping candidate and 13% more dead copies deleted  in spec2000/2006/2017 on AArch64.

Reviewers: qcolombet, MatzeB, thegameg, mcrosier, gberry, hfinkel, john.brawn, twoh, RKSimon, sebpop, kparzysz

Reviewed By: sebpop

Subscribers: evandro, sebpop, sfertile, aemerson, mgorny, javed.absar, kristof.beyls, llvm-commits

Differential Revision: https://reviews.llvm.org/D41463

llvm-svn: 328237
 		2018-03-22 20:06:47 +00:00
..
AsmParser [AArch64] Add support for secrel add/load/store relocations for COFF 2018-03-01 20:42:28 +00:00
Disassembler [AArch64][SVE] Asm: Add AND_ZI instructions and aliases 2018-02-06 13:13:21 +00:00
InstPrinter [AArch64][AsmParser] NFC: Generalize LogicalImm[Not](32|64) code 2018-01-29 13:05:38 +00:00
MCTargetDesc Delete code that is probably dead since r249303. 2018-03-08 00:17:13 +00:00
TargetInfo Add backend name to Target to enable runtime info to be fed back into TableGen 2017-11-15 23:55:44 +00:00
Utils [AArch64][SVE] Asm: Predicate patterns 2018-01-22 10:46:00 +00:00
AArch64.h [AArch64] Avoid SIMD interleaved store instruction for Exynos. 2017-12-08 00:58:49 +00:00
AArch64.td [PATCH] [AArch64] Add new target feature to fuse conditional select 2018-02-23 19:27:43 +00:00
AArch64A53Fix835769.cpp Target/TargetInstrInfo.h -> CodeGen/TargetInstrInfo.h to match layering 2017-11-08 01:01:31 +00:00
AArch64A57FPLoadBalancing.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
AArch64AdvSIMDScalarPass.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
AArch64AsmPrinter.cpp [CodeGen] Hoist common AsmPrinter code out of X86, ARM, and AArch64 2018-01-17 23:55:23 +00:00
AArch64CallLowering.cpp [GISel]: Don't assert when constraining RegisterOperands which are uses. 2018-02-26 22:56:21 +00:00
AArch64CallLowering.h GlobalISel (AArch64): fix ABI at border between GPRs and SP. 2017-08-21 21:56:11 +00:00
AArch64CallingConvention.h Target/TargetInstrInfo.h -> CodeGen/TargetInstrInfo.h to match layering 2017-11-08 01:01:31 +00:00
AArch64CallingConvention.td [AArch64] Implement dynamic stack probing for windows 2018-02-17 14:26:32 +00:00
AArch64CleanupLocalDynamicTLSPass.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
AArch64CollectLOH.cpp Revert "[CodeGen] Move printing '\n' from MachineInstr::print to MachineBasicBlock::print" 2018-02-19 15:08:49 +00:00
AArch64CondBrTuning.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
AArch64ConditionOptimizer.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
AArch64ConditionalCompares.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
AArch64DeadRegisterDefinitionsPass.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
AArch64ExpandPseudoInsts.cpp [AArch64] Fold adds with tprel_lo12_nc and secrel_lo12 into a following ldr/str 2018-03-12 18:47:43 +00:00
AArch64FalkorHWPFFix.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
AArch64FastISel.cpp [AArch64FastISel] Replace deprecated calls to MemoryIntrinsic::getAlignment() (NFCI) 2018-02-09 21:49:29 +00:00
AArch64FrameLowering.cpp [AArch64] Emit CSR loads in the same order as stores 2018-03-14 20:34:03 +00:00
AArch64FrameLowering.h Move TargetFrameLowering.h to CodeGen where it's implemented 2017-11-03 22:32:11 +00:00
AArch64GenRegisterBankInfo.def [AArch64][RegisterBankInfo] Teach instruction mapping about gpr32 -> fpr16 cross copies 2017-11-18 04:28:56 +00:00
AArch64ISelDAGToDAG.cpp [AArch64] Fix UB about shift amount exceeds data bit-width 2018-03-08 00:28:25 +00:00
AArch64ISelLowering.cpp [ARM, AArch64] Check the no-stack-arg-probe attribute for dynamic stack probes 2018-03-19 20:06:50 +00:00
AArch64ISelLowering.h [AArch64] Implement native TLS for Windows 2018-03-10 19:05:21 +00:00
AArch64InstrAtomics.td [AArch64] Improve v8.1-A code-gen for atomic load-and 2018-02-12 17:03:11 +00:00
AArch64InstrFormats.td TableGen: Check the dynamic type of !cast<Rec>(string) 2018-03-19 14:14:20 +00:00
AArch64InstrInfo.cpp [MachineOutliner] AArch64: Emit CFI instructions when outlining calls 2018-03-19 22:48:40 +00:00
AArch64InstrInfo.h [AArch64] Refactor stand alone methods (NFC) 2018-02-09 16:14:41 +00:00
AArch64InstrInfo.td [AArch64] Fold adds with tprel_lo12_nc and secrel_lo12 into a following ldr/str 2018-03-12 18:47:43 +00:00
AArch64InstructionSelector.cpp [AArch64][GlobalISel] When copying from a gpr32 to an fpr16 reg, convert to fpr32 first. 2018-02-20 05:11:57 +00:00
AArch64LegalizerInfo.cpp [globalisel][legalizerinfo] Follow up on post-commit review comments after r323681 2018-02-13 23:02:44 +00:00
AArch64LegalizerInfo.h [aarch64][globalisel] Define G_ATOMIC_CMPXCHG and G_ATOMICRMW_* and make them legal 2017-11-28 20:21:15 +00:00
AArch64LoadStoreOptimizer.cpp [CodeGen] Add a new pass for PostRA sink 2018-03-22 20:06:47 +00:00
AArch64MCInstLower.cpp [AArch64] Implement native TLS for Windows 2018-03-10 19:05:21 +00:00
AArch64MCInstLower.h [COFF, ARM64] Add support for Windows ARM64 COFF format 2017-06-27 23:58:19 +00:00
AArch64MachineFunctionInfo.h [AArch64] Fix some Clang-tidy modernize-use-using and Include What You Use warnings; other minor fixes (NFC). 2017-07-25 23:51:02 +00:00
AArch64MacroFusion.cpp [PATCH] [AArch64] Add new target feature to fuse conditional select 2018-02-23 19:27:43 +00:00
AArch64MacroFusion.h Recommit rL305677: [CodeGen] Add generic MacroFusion pass 2017-06-19 12:53:31 +00:00
AArch64PBQPRegAlloc.cpp Rename LiveIntervalAnalysis.h to LiveIntervals.h 2017-12-13 02:51:04 +00:00
AArch64PBQPRegAlloc.h [CodeGen] Fix some Clang-tidy modernize-use-using and Include What You Use warnings; other minor fixes (NFC). 2017-06-01 23:25:02 +00:00
AArch64PerfectShuffle.h
…
AArch64PromoteConstant.cpp [AArch64] Fix some Clang-tidy modernize-use-using and Include What You Use warnings; other minor fixes (NFC). 2017-07-25 23:51:02 +00:00
AArch64RedundantCopyElimination.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
AArch64RegisterBankInfo.cpp [AArch64] Map G_LOAD on FPR when the definition goes to a copy to FPR 2017-11-18 04:28:59 +00:00
AArch64RegisterBankInfo.h [AArch64][RegisterBankInfo] Add mapping for G_FPEXT. 2017-11-02 23:38:19 +00:00
AArch64RegisterBanks.td [aarch64][globalisel] Register banks and classes should have distinct names. 2017-10-18 00:12:43 +00:00
AArch64RegisterInfo.cpp [AArch64] Implement dynamic stack probing for windows 2018-02-17 14:26:32 +00:00
AArch64RegisterInfo.h [AArch64] Implement dynamic stack probing for windows 2018-02-17 14:26:32 +00:00
AArch64RegisterInfo.td [AArch64][SVE] Asm: Add restricted register classes for SVE predicate vectors. 2018-01-03 10:15:46 +00:00
AArch64SIMDInstrOpt.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
AArch64SVEInstrInfo.td [AArch64][SVE] Asm: Add AND_ZI instructions and aliases 2018-02-06 13:13:21 +00:00
AArch64SchedA53.td [AArch64] Fix a few InstRWs in the A53 scheduler model and enable FullInstRWOverlapCheck. 2018-03-18 22:16:53 +00:00
AArch64SchedA57.td [AArch64][SVE] Asm: Set SVE as unsupported feature for existing scheduler models. 2017-11-07 15:03:11 +00:00
AArch64SchedA57WriteRes.td
…
AArch64SchedCyclone.td [AArch64][SVE] Asm: Set SVE as unsupported feature for existing scheduler models. 2017-11-07 15:03:11 +00:00
AArch64SchedExynosM1.td [AArch64][NFC] Make all ProcResource definitions include their SchedModel. 2018-02-01 12:12:01 +00:00
AArch64SchedExynosM3.td [AArch64] Adjust the cost model for Exynos M3 2018-03-20 20:00:29 +00:00
AArch64SchedFalkor.td [TableGen] When trying to reuse a scheduler class for instructions from an InstRW, make sure we haven't already seen another InstRW containing this instruction on this CPU. 2018-03-18 19:56:15 +00:00
AArch64SchedFalkorDetails.td [AArch64][Falkor] Correct load/store increment scheduling details 2018-03-20 13:46:35 +00:00
AArch64SchedKryo.td [TableGen] When trying to reuse a scheduler class for instructions from an InstRW, make sure we haven't already seen another InstRW containing this instruction on this CPU. 2018-03-18 19:56:15 +00:00
AArch64SchedKryoDetails.td [AArch64][Kryo] Add missing write latency for LDAXP, LDXP second destination. 2017-06-19 21:57:42 +00:00
AArch64SchedThunderX.td [TableGen] When trying to reuse a scheduler class for instructions from an InstRW, make sure we haven't already seen another InstRW containing this instruction on this CPU. 2018-03-18 19:56:15 +00:00
AArch64SchedThunderX2T99.td [TableGen] When trying to reuse a scheduler class for instructions from an InstRW, make sure we haven't already seen another InstRW containing this instruction on this CPU. 2018-03-18 19:56:15 +00:00
AArch64Schedule.td
…
AArch64SelectionDAGInfo.cpp AArch64/X86: Factor out common bzero logic; NFC 2017-12-18 23:14:28 +00:00
AArch64SelectionDAGInfo.h
…
AArch64StorePairSuppress.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
AArch64Subtarget.cpp [AArch64] Properly handle dllimport of variables when using fast-isel 2018-01-30 19:50:51 +00:00
AArch64Subtarget.h [PATCH] [AArch64] Add new target feature to fuse conditional select 2018-02-23 19:27:43 +00:00
AArch64SystemOperands.td [AArch64] Fix spelling of ICH_ELRSR_EL2 system register 2018-02-06 09:39:04 +00:00
AArch64TargetMachine.cpp Add a TargetOption to enable/disable GlobalISel 2018-01-17 22:34:21 +00:00
AArch64TargetMachine.h (Re-landing) Expose a TargetMachine::getTargetTransformInfo function 2017-12-22 18:21:59 +00:00
AArch64TargetObjectFile.cpp Move Object format code to lib/BinaryFormat. 2017-06-07 03:48:56 +00:00
AArch64TargetObjectFile.h Fix a bunch more layering of CodeGen headers that are in Target 2017-11-17 01:07:10 +00:00
AArch64TargetTransformInfo.cpp [AArch64] Implement getArithmeticReductionCost 2018-03-16 11:34:15 +00:00
AArch64TargetTransformInfo.h [AArch64] Implement getArithmeticReductionCost 2018-03-16 11:34:15 +00:00
CMakeLists.txt [AArch64] Rename AArch64VecorByElementOpt.cpp into AArch64SIMDInstrOpt.cpp to reflect the recently added features. 2017-12-08 22:04:13 +00:00
LLVMBuild.txt
…
SVEInstrFormats.td [AArch64][SVE] Asm: Add AND_ZI instructions and aliases 2018-02-06 13:13:21 +00:00