[llvm-bugs] [Bug 41660] New: ARMDisassembler.cpp - DecodeGPRPairRegisterClass - always false condition

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41660

            Bug ID: 41660
           Summary: ARMDisassembler.cpp - DecodeGPRPairRegisterClass -
                    always false condition
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: ARM
          Assignee: unassignedbugs at nondot.org
          Reporter: llvm-dev at redking.me.uk
                CC: llvm-bugs at lists.llvm.org, peter.smith at linaro.org,
                    Ties.Stuij at arm.com
            Blocks: 41655

Reported in https://www.viva64.com/en/b/0629/

static DecodeStatus DecodeGPRPairRegisterClass(MCInst &Inst, unsigned RegNo,
                                   uint64_t Address, const void *Decoder) {
  DecodeStatus S = MCDisassembler::Success;

  if (RegNo > 13)
    return MCDisassembler::Fail;

  if ((RegNo & 1) || RegNo == 0xe)
     S = MCDisassembler::SoftFail;
  ....
}

(RegNo == 0xe) can never be true as we've already returned if (RegNo > 13).


Referenced Bugs:

https://bugs.llvm.org/show_bug.cgi?id=41655
[Bug 41655] Finding Bugs in LLVM 8 with PVS-Studio
-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20190429/4a069784/attachment.html>