lots of `-Warray-bounds=` warnings in `llvm/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp`

[firewave]

In function ‘DecodeStatus decodeRegisterClass(llvm::MCInst&, uint64_t, const llvm::MCPhysReg (&)[N]) [with long unsigned int N = 32]’,
    inlined from ‘DecodeStatus decodeRegisterClass(llvm::MCInst&, uint64_t, const llvm::MCPhysReg (&)[N]) [with long unsigned int N = 8]’ at /home/user/CLionProjects/llvm-project/llvm/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp:84:21,
    inlined from ‘DecodeStatus DecodeCRRCRegisterClass(llvm::MCInst&, uint64_t, uint64_t, const llvm::MCDisassembler*)’ at /home/user/CLionProjects/llvm-project/llvm/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp:95:29,
    inlined from ‘DecodeStatus DecodeCRRCRegisterClass(llvm::MCInst&, uint64_t, uint64_t, const llvm::MCDisassembler*)’ at /home/user/CLionProjects/llvm-project/llvm/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp:92:21,
    inlined from ‘DecodeStatus llvm::decodeToMCInst(DecodeStatus, unsigned int, InsnType, MCInst&, uint64_t, const MCDisassembler*, bool&) [with InsnType = long unsigned int]’ at /home/user/CLionProjects/llvm-project/build/lib/Target/PowerPC/PPCGenDisassemblerTables.inc:6610:15:
/home/user/CLionProjects/llvm-project/llvm/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp:88:44: warning: array subscript ‘const llvm::MCPhysReg [32] {aka const short unsigned int [32]}[0]’ is partly outside array bounds of ‘const llvm::MCPhysReg [8]’ {aka ‘const short unsigned int [8]’} [-Warray-bounds=]
   88 |   Inst.addOperand(MCOperand::createReg(Regs[RegNo]));
      |                                        ~~~~^
/home/user/CLionProjects/llvm-project/llvm/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp: In function ‘DecodeStatus llvm::decodeToMCInst(DecodeStatus, unsigned int, InsnType, MCInst&, uint64_t, const MCDisassembler*, bool&) [with InsnType = long unsigned int]’:
/home/user/CLionProjects/llvm-project/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.h:279:26: note: object ‘CRRegs’ of size 16
  279 |   static const MCPhysReg CRRegs[8] = PPC_REGS0_7(PPC::CR);                     \
      |                          ^~~~~~
/home/user/CLionProjects/llvm-project/llvm/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp:20:1: note: in expansion of macro ‘DEFINE_PPC_REGCLASSES’
   20 | DEFINE_PPC_REGCLASSES
      | ^~~~~~~~~~~~~~~~~~~~~

This is just a excerpt. There are lots of them.

I am using gcc (GCC) 14.2.1 20240910 on Manjaro Linux.

[llvmbot]

@llvm/issue-subscribers-backend-powerpc

Author: Oliver Stöneberg (firewave)

``` In function ‘DecodeStatus decodeRegisterClass(llvm::MCInst&, uint64_t, const llvm::MCPhysReg (&)[N]) [with long unsigned int N = 32]’, inlined from ‘DecodeStatus decodeRegisterClass(llvm::MCInst&, uint64_t, const llvm::MCPhysReg (&)[N]) [with long unsigned int N = 8]’ at /home/user/CLionProjects/llvm-project/llvm/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp:84:21, inlined from ‘DecodeStatus DecodeCRRCRegisterClass(llvm::MCInst&, uint64_t, uint64_t, const llvm::MCDisassembler*)’ at /home/user/CLionProjects/llvm-project/llvm/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp:95:29, inlined from ‘DecodeStatus DecodeCRRCRegisterClass(llvm::MCInst&, uint64_t, uint64_t, const llvm::MCDisassembler*)’ at /home/user/CLionProjects/llvm-project/llvm/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp:92:21, inlined from ‘DecodeStatus llvm::decodeToMCInst(DecodeStatus, unsigned int, InsnType, MCInst&, uint64_t, const MCDisassembler*, bool&) [with InsnType = long unsigned int]’ at /home/user/CLionProjects/llvm-project/build/lib/Target/PowerPC/PPCGenDisassemblerTables.inc:6610:15: /home/user/CLionProjects/llvm-project/llvm/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp:88:44: warning: array subscript ‘const llvm::MCPhysReg [32] {aka const short unsigned int [32]}[0]’ is partly outside array bounds of ‘const llvm::MCPhysReg [8]’ {aka ‘const short unsigned int [8]’} [-Warray-bounds=] 88 | Inst.addOperand(MCOperand::createReg(Regs[RegNo])); | ~~~~^ /home/user/CLionProjects/llvm-project/llvm/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp: In function ‘DecodeStatus llvm::decodeToMCInst(DecodeStatus, unsigned int, InsnType, MCInst&, uint64_t, const MCDisassembler*, bool&) [with InsnType = long unsigned int]’: /home/user/CLionProjects/llvm-project/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.h:279:26: note: object ‘CRRegs’ of size 16 279 | static const MCPhysReg CRRegs[8] = PPC_REGS0_7(PPC::CR); \ | ^~~~~~ /home/user/CLionProjects/llvm-project/llvm/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp:20:1: note: in expansion of macro ‘DEFINE_PPC_REGCLASSES’ 20 | DEFINE_PPC_REGCLASSES | ^~~~~~~~~~~~~~~~~~~~~ ```

This is just a excerpt. There are lots of them.

I am using gcc (GCC) 14.2.1 20240910 on Manjaro Linux.