[LLVMbugs] [Bug 8521] New: NEON instruction VQSHLU producing bad cast

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8521

           Summary: NEON instruction VQSHLU producing bad cast
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: rengolin at gmail.com
                CC: llvmbugs at cs.uiuc.edu


When lowering vqshlu_n_s8() (file attached), Clang breaks with bad cast.

Command line:
$ clang -ccc-host-triple armv7a-none-eabi -ccc-gcc-name arm-none-eabi-gcc
-mfloat-abi=hard -w -emit-llvm -mcpu=cortex-a8 -S vqshlu_n.c -o -

Error:
clang: Constants.cpp:1174: static llvm::Constant*
llvm::ConstantExpr::getCast(unsigned int, llvm::Constant*, const llvm::Type*):
Assertion `CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!"'
failed.
(...)
7  clang           0x00000000007c2885 llvm::IRBuilder<true,
llvm::ConstantFolder, llvm::IRBuilderDefaultInserter<true>
>::CreateCast(llvm::Instruction::CastOps, llvm::Value*, llvm::Type const*,
llvm::Twine const&) + 101
8  clang           0x00000000008fd4ae
clang::CodeGen::CodeGenFunction::EmitNeonCall(llvm::Function*,
llvm::SmallVectorImpl<llvm::Value*>&, char const*, bool, unsigned int, bool) +
238
(...)

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