[LLVMbugs] [Bug 4226] New: ARM does not lower all vshifts

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Mon May 18 06:20:22 PDT 2009


           Summary: ARM does not lower all vshifts
           Product: libraries
           Version: 2.5
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Backend: ARM
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: xerxes at zafena.se
                CC: llvmbugs at cs.uiuc.edu

When running the included testcase in llvm test/CodeGen/X86/vshift_split.ll
using the arm backend:

llvm-as < test/CodeGen/X86/vshift_split.ll | llc -march=arm            
llvm::SDValue ExpandSRx(llvm::SDNode*, llvm::SelectionDAG&, const
llvm::ARMSubtarget*): Assertion `N->getValueType(0) == MVT::i64 &&
(N->getOpcode() == ISD::SRL || N->getOpcode() == ISD::SRA) && "Unknown shift to
lower!"' failed.
Stack dump:
0.      Program arguments: llc -march=arm 
1.      Running pass 'ARM Instruction Selection' on function '@update'
root at overo:~/llvm-test/fail# 

I have tested this on both 2.5 and svn trunk

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