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

[Jun Koi]

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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