[LLVMdev] Wrong encoding/decoding for POPC instruction of Sparc

[Jun Koi]

Any ideas on this bug?

Thanks.


On Wed, Jul 29, 2015 at 12:17 AM, Jun Koi <junkoi2004 at gmail.com> wrote:

> Hello,
>
> There is an issue in the latest Sparc code: while we can encode POPC,
> decode results in crash in llvm-mc
>
> $ echo "popc %g1, %g2" | ./Release+Asserts/bin/llvm-mc -assemble
> -triple=sparcv9 -show-encoding
>     .text
>     popc %g1, %g2                   ! encoding: [0x85,0x70,0x00,0x01]
>
> $ echo "0x85,0x70,0x00,0x01"|./Release+Asserts/bin/llvm-mc -disassemble
> -triple=sparcv9
>     .text
>     popc Assertion failed: (idx < size()), function operator[], file
> /Users/jun/projects/llvm/sparc-2.git/include/llvm/ADT/SmallVector.h, line
> 143.
> 0  llvm-mc                  0x00000001096a5099
> llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 57
> 1  llvm-mc                  0x00000001096a45c6
> llvm::sys::RunSignalHandlers() + 102
> 2  llvm-mc                  0x00000001096a5b95 SignalHandler(int) + 693
> 3  libsystem_platform.dylib 0x00007fff86d78f1a _sigtramp + 26
> 4  libsystem_platform.dylib 0x0000000000000002 _sigtramp + 2032693506
> 5  llvm-mc                  0x00000001096a5836 abort + 22
> 6  llvm-mc                  0x00000001096a5811 __assert_rtn + 81
> 7  llvm-mc                  0x000000010963f4e8
> llvm::SparcInstPrinter::printOperand(llvm::MCInst const*, int,
> llvm::MCSubtargetInfo const&, llvm::raw_ostream&) + 136
> 8  llvm-mc                  0x000000010963eae0
> llvm::SparcInstPrinter::printInstruction(llvm::MCInst const*,
> llvm::MCSubtargetInfo const&, llvm::raw_ostream&) + 256
> 9  llvm-mc                  0x000000010964f5e6
> llvm::SparcInstPrinter::printInst(llvm::MCInst const*, llvm::raw_ostream&,
> llvm::StringRef, llvm::MCSubtargetInfo const&) + 86
> 10 llvm-mc                  0x000000010965f90f (anonymous
> namespace)::MCAsmStreamer::EmitInstruction(llvm::MCInst const&,
> llvm::MCSubtargetInfo const&) + 2879
> 11 llvm-mc                  0x00000001096043b3
> llvm::Disassembler::disassemble(llvm::Target const&,
> std::__1::basic_string<char, std::__1::char_traits<char>,
> std::__1::allocator<char> > const&, llvm::MCSubtargetInfo&,
> llvm::MCStreamer&, llvm::MemoryBuffer&, llvm::SourceMgr&,
> llvm::raw_ostream&) + 2147
> 12 llvm-mc                  0x0000000109607460 main + 9760
> 13 libdyld.dylib            0x00007fff8f34d5c9 start + 1
> 14 libdyld.dylib            0x0000000000000003 start + 1892362811
> Stack dump:
> 0.    Program arguments: ./Release+Asserts/bin/llvm-mc -disassemble
> -triple=sparcv9
> Illegal instruction: 4
>
>
> Any ideas on what is wrong, and how to fix this?
>
>
> Thank you.
>
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