[LLVMbugs] [Bug 2604] New: mfocrf definition in PPCInstrInfo. td contradicts PowerPC spec

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2604

           Summary: mfocrf definition in PPCInstrInfo.td contradicts PowerPC
                    spec
           Product: libraries
           Version: 2.3
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Backend: PowerPC
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: maxburke at gmail.com
                CC: llvmbugs at cs.uiuc.edu


The definition for the "mfocrf" instruction in PPCInstrInfo.td appears to be
incorrect:

def MFOCRF: XFXForm_5a<31, 19, (outs GPRC:$rT), (ins crbitm:$FXM),
                       "mfcr $rT, $FXM", SprMFCR>,

According to the PowerPC programming environment manual, there is only one form
of mfcr which takes only a destination register as a parameter. This should
read as follows:

def MFOCRF: XFXForm_5a<31, 19, (outs GPRC:$rT), (ins crbitm:$FXM),
                       "mfocrf $rT, $FXM", SprMFCR>,


Reference link:
http://publib.boulder.ibm.com/infocenter/systems/topic/com.ibm.aix.aixassem/doc/alangref/mfocrf.htm


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