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llvm-project/llvm/lib/Target/BPF
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Yonghong Song d96c1bbaa0 [BPF] disable ReduceLoadWidth during SelectionDag phase 
The compiler may transform the following code
  ctx = ctx + reloc_offset
  ... (*(u32 *)ctx) & 0x8000 ...
to
  ctx = ctx + reloc_offset
  ... (*(u8 *)(ctx + 1)) & 0x80 ...
where reloc_offset will be replaced with a constant during
AsmPrinter phase.

The above transformed code will be rejected the kernel verifier
as it does not allow
  *(type *)((ctx + non_zero_offset1) + non_zero_offset2)
style access pattern.

It is hard at SelectionDag phase to identify whether a load
is related to context or not. Sometime, interprocedure analysis
may be needed. So let us simply prevent such optimization
from happening.

Differential Revision: https://reviews.llvm.org/D73997
 		2020-02-04 18:37:43 -08:00
..
AsmParser CMake: Make most target symbols hidden by default 2020-01-14 19:46:52 -08:00
Disassembler CMake: Make most target symbols hidden by default 2020-01-14 19:46:52 -08:00
MCTargetDesc CMake: Make most target symbols hidden by default 2020-01-14 19:46:52 -08:00
TargetInfo CMake: Make most target symbols hidden by default 2020-01-14 19:46:52 -08:00
BPF.h bpf: fix wrong truncation elimination when there is back-edge/loop 2019-10-16 15:27:59 +00:00
BPF.td
…
BPFAbstractMemberAccess.cpp [BPF] handle typedef of struct/union for CO-RE relocations 2020-02-04 08:53:03 -08:00
BPFAsmPrinter.cpp CMake: Make most target symbols hidden by default 2020-01-14 19:46:52 -08:00
BPFCORE.h [BPF] Remove relocation for patchable externs 2019-10-10 15:33:09 +00:00
BPFCallingConv.td
…
BPFFrameLowering.cpp
…
BPFFrameLowering.h [Alignment][NFC] Use Align for TargetFrameLowering/Subtarget 2019-10-17 07:49:39 +00:00
BPFISelDAGToDAG.cpp [IR] Split out target specific intrinsic enums into separate headers 2019-12-11 18:02:14 -08:00
BPFISelLowering.cpp [Alignment][NFC] Remove unneeded llvm:: scoping on Align types 2019-09-27 12:54:21 +00:00
BPFISelLowering.h [BPF] disable ReduceLoadWidth during SelectionDag phase 2020-02-04 18:37:43 -08:00
BPFInstrFormats.td
…
BPFInstrInfo.cpp [NFC] unsigned->Register in storeRegTo/loadRegFromStack 2020-02-03 14:22:16 +01:00
BPFInstrInfo.h [NFC] unsigned->Register in storeRegTo/loadRegFromStack 2020-02-03 14:22:16 +01:00
BPFInstrInfo.td [BPF] Enable relocation location for load/store/shifts 2019-12-26 09:07:39 -08:00
BPFMCInstLower.cpp
…
BPFMCInstLower.h
…
BPFMIChecking.cpp Prune a LegacyDivergenceAnalysis and MachineLoopInfo include each 2019-10-19 01:31:09 +00:00
BPFMIPeephole.cpp [BPF] Fix a recursion bug in BPF Peephole ZEXT optimization 2019-11-22 08:05:43 -08:00
BPFMISimplifyPatchable.cpp [BPF] fix a bug in BPFMISimplifyPatchable pass with -O0 2020-01-30 08:28:39 -08:00
BPFRegisterInfo.cpp Apply llvm-prefer-register-over-unsigned from clang-tidy to LLVM 2019-08-15 19:22:08 +00:00
BPFRegisterInfo.h CodeGen: Introduce a class for registers 2019-06-24 15:50:29 +00:00
BPFRegisterInfo.td
…
BPFSelectionDAGInfo.cpp
…
BPFSelectionDAGInfo.h
…
BPFSubtarget.cpp [BPF] turn on -mattr=+alu32 for cpu version v3 and later 2019-11-07 22:08:46 -08:00
BPFSubtarget.h
…
BPFTargetMachine.cpp Make llvm::StringRef to std::string conversions explicit. 2020-01-28 23:25:25 +01:00
BPFTargetMachine.h
…
BTF.def [BPF] Add BTF Var and DataSec Support 2019-03-16 15:36:31 +00:00
BTF.h [BPF] extend BTF_KIND_FUNC to cover global, static and extern funcs 2020-01-10 09:06:31 -08:00
BTFDebug.cpp Make llvm::StringRef to std::string conversions explicit. 2020-01-28 23:25:25 +01:00
BTFDebug.h [BPF] extend BTF_KIND_FUNC to cover global, static and extern funcs 2020-01-10 09:06:31 -08:00
CMakeLists.txt [BPF] Fix a typo in the file name 2019-07-09 18:35:46 +00:00
LLVMBuild.txt [BPF] Move InstPrinter files to MCTargetDesc. NFC 2019-05-11 01:13:21 +00:00