[llvm-dev] Segmentation fault in lowerVectorShuffle

[hameeza ahmed via llvm-dev]

Hello,

I am getting segmentation fault in vshuffle implementation
(lowerV32I64VectorShuffle) for v32i64.

After debugging and using bt i am getting the following messages;

(gdb) bt
#0  llvm::SDNode::isUndef (this=0x7fff00000001)
    at /include/llvm/CodeGen/SelectionDAGNodes.h:556
#1  0x00000000009b8038 in llvm::SDValue::isUndef (this=0x7fffffff9d90)
    at /include/llvm/CodeGen/SelectionDAGNodes.h:989
#2  0x0000000000970fed in lowerV16X128VectorShuffle (DL=..., VT=...,
Mask=...,
    V1=..., V2=..., DAG=...)
    at /lib/Target/X86/X86ISelLowering.cpp:13902
#3  0x000000000096f263 in lowerV32I64VectorShuffle (DL=..., Mask=...,
    Zeroable=..., V1=..., V2=..., Subtarget=..., DAG=...)
    at /lib/Target/X86/X86ISelLowering.cpp:13995
#4  0x00000000009368ff in lower2048BitVectorShuffle (DL=..., Mask=...,
VT=...,
    V1=..., V2=..., Zeroable=..., Subtarget=..., DAG=...)
    at /lib/Target/X86/X86ISelLowering.cpp:14159
#5  0x00000000008bd6ff in lowerVectorShuffle (Op=..., Subtarget=...,
DAG=...)
    at /lib/Target/X86/X86ISelLowering.cpp:15065
#6  0x00000000008b9573 in llvm::X86TargetLowering::LowerOperation (
    this=0x3079f08, Op=..., DAG=...)
    at /lib/Target/X86/X86ISelLowering.cpp:24922
#7  0x00000000016fc710 in (anonymous
namespace)::SelectionDAGLegalize::LegalizeOp (this=0x7fffffffb7f0,
Node=0x310e500)
    at /lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:1111
#8  0x00000000016fb54c in llvm::SelectionDAG::Legalize (this=0x304ca70)
    at /lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:4542
#9  0x0000000001815d45 in llvm::SelectionDAGISel::CodeGenAndEmitDAG (
    this=0x304c5b0)
    at /lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:831
#10 0x000000000181476e in llvm::SelectionDAGISel::SelectBasicBlock (
---Type <return> to continue, or q <return> to quit---
    this=0x304c5b0, Begin=..., End=..., HadTailCall=@0x7fffffffc4fd: false)
    at /lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:683
#11 0x00000000018145a5 in llvm::SelectionDAGISel::SelectAllBasicBlocks (
    this=0x304c5b0, Fn=...)
    at /lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:1558

#12 0x0000000001812459 in llvm::SelectionDAGISel::runOnMachineFunction (
    this=0x304c5b0, mf=...)
    at /lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:504
#13 0x0000000000834c6b in (anonymous
namespace)::X86DAGToDAGISel::runOnMachineFunction (this=0x304c5b0, MF=...)
    at /lib/Target/X86/X86ISelDAGToDAG.cpp:176
#14 0x000000000104dce1 in llvm::MachineFunctionPass::runOnFunction (
    this=0x304c5b0, F=...)
    at /lib/CodeGen/MachineFunctionPass.cpp:62
#15 0x000000000147823f in llvm::FPPassManager::runOnFunction
(this=0x3049b70,
    F=...) at /lib/IR/LegacyPassManager.cpp:1513
#16 0x0000000001478555 in llvm::FPPassManager::runOnModule (this=0x3049b70,
    M=...) at /lib/IR/LegacyPassManager.cpp:1534
#17 0x0000000001478cea in (anonymous namespace)::MPPassManager::runOnModule
(
    this=0x3034e50, M=...)
    at /lib/IR/LegacyPassManager.cpp:1590
#18 0x0000000001478816 in llvm::legacy::PassManagerImpl::run
(this=0x303f4d0,
    M=...) at /lib/IR/LegacyPassManager.cpp:1693
#19 0x0000000001479201 in llvm::legacy::PassManager::run
(this=0x7fffffffd788,
    M=...) at /lib/IR/LegacyPassManager.cpp:1724
#20 0x000000000076be0e in compileModule (argv=0x7fffffffdf78, Context=...)
    at /tools/llc/llc.cpp:528
---Type <return> to continue, or q <return> to quit---
#21 0x000000000076a2f9 in main (argc=4, argv=0x7fffffffdf78)
    at /tools/llc/llc.cpp:285
(gdb)

How to resolve this issue? Please help.

Thank You
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