[LLVMbugs] [Bug 2916] New: SubReg implementation can not be used to insert the hi sub-register.

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2916

           Summary: SubReg implementation can not be used to insert the hi
                    sub-register.
           Product: tools
           Version: trunk
          Platform: PC
               URL: http://lists.cs.uiuc.edu/pipermail/llvmdev/2008-
                    October/017786.html
        OS/Version: Linux
            Status: NEW
          Keywords: portability
          Severity: normal
          Priority: P2
         Component: llc
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sanjiv.gupta at microchip.com
                CC: llvmbugs at cs.uiuc.edu


We have 16-bit register class and want to set both the lo and high parts using
INSERT_SUBREG. The hi part can not be inserted using SubIdx 2 unless you
declare the sub register class twice in the SubRegClassList.

def FSR16: RegisterClass <"PIC16", [i16], 8, [FSR0, FSR1]> {
  let SubRegClassList = [FSR8, FSR8];   // HERE.
}

For more details refer to the email thread.


-- 
Configure bugmail: http://llvm.org/bugs/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.