[LLVMbugs] [Bug 2255] New: getCopyRegToReg() does not support ST(1) as dest register

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Sun Apr 27 16:35:52 PDT 2008


           Summary: getCopyRegToReg() does not support ST(1) as dest
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Backend: X86
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: asl at math.spbu.ru
                CC: llvmbugs at cs.uiuc.edu

Created an attachment (id=1607)
 --> (http://llvm.org/bugs/attachment.cgi?id=1607)
Test bytecode

Consider attached testcase. I'm having:

llc: /home/asl/proj/llvm/src/lib/Target/X86/X86InstrInfo.cpp:1593: virtual void
llvm::ilist_iterator<llvm::MachineInstr>, unsigned int, unsigned int, const
llvm::TargetRegisterClass*, const llvm::TargetRegisterClass*) const: Assertion
`DestReg == X86::ST0 && "Can only copy to TOS right now"' failed.

This currently prevents mingw64 CRT bootstrap with llvm-gcc

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