[LLVMbugs] [Bug 17372] New: Emitting PLD for stack data on ARM Thumb2

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17372

            Bug ID: 17372
           Summary: Emitting PLD for stack data on ARM Thumb2
           Product: new-bugs
           Version: trunk
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: weimingz at codeaurora.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 11281
  --> http://llvm.org/bugs/attachment.cgi?id=11281&action=edit
test case

Currently, LLVM does not handle t2PLDi12, t2PLDi8 and
    t2PLDs, so an opcode of 0 is returned, which causes compiler crash in
    debug build or missing PLD in release build.

For example, for the given test case:

./Debug+Asserts/bin/llc -march=thumb -mattr=+v7 <
/prj/llvm-arm/home/weimingz/llvm-src/community-tip/prefetch.ll 

    llc:
/local/scratch/llvm-build/community-tip/lib/Target/ARM/InstPrinter/../ARMGenAsmWriter.inc:6119:
void llvm::ARMInstPrinter::printInstruction(const llvm::MCInst*,
llvm::raw_ostream&): Assertion `Bits != 0 && "Cannot print this instruction."'
failed.
0  llc             0x00000000011d2177 llvm::sys::PrintStackTrace(_IO_FILE*) +
38
1  llc             0x00000000011d23f4
2  llc             0x00000000011d1e2a
3  libpthread.so.0 0x00007f393a3088f0
4  libc.so.6       0x00007f39391aca75 gsignal + 53
5  libc.so.6       0x00007f39391b05c0 abort + 384
6  libc.so.6       0x00007f39391a5941 __assert_fail + 241

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