Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-6765180

Block::is_uncommon() gives wrong answer sometimes

    Details

    • Type: Enhancement
    • Status: Closed
    • Priority: P4
    • Resolution: Cannot Reproduce
    • Affects Version/s: hs14
    • Fix Version/s: hs15
    • Component/s: hotspot
    • Labels:
      None
    • Subcomponent:
    • CPU:
      sparc
    • OS:
      solaris_10

      Description

      Block::is_uncommon() gives wrong answer sometimes.
      As result uncommon blocks could be placed in a middle of a hot code:

      0c7 B9: # B16 <- B8 Freq: 1.37622e+06
      0c7 JMP B16
      0c7
      0cc B10: # B44 B11 <- B42 Freq: 1.37622
      0cc TEST EBX,#384
      0d2 Jne B44 P=0.000001 C=-1.000000
      0d2
      0d8 B11: # B12 <- B10 Freq: 1.37622
      0d8 AND EAX,#511
      0de MOV EBX, EBP # CastP2X
      0e0 OR EBX,EAX
      0e2
      0e2 B12: # B8 B13 <- B11 B44 Freq: 1.37622
      0e2 CMPXCHG [ECX],EBX # If EAX==[ECX] Then store EBX into [ECX]
      0e6 Jeq,s B8 P=0.999999 C=-1.000000
      0e6
      0e8 B13: # B45 <- B12 Freq: 1.37622e-06
      0e8 MOV EBX,[ESP + #8]
      0ec MOV EDX,[ESP + #12]
      0f0 JMP B45
      0f0
      0f5 B14: # B45 B15 <- B6 B43 Freq: 1.37622
      0f5 LEA EDI,[ESP + #64]
      0f9 FASTLOCK ECX, EDI KILLS EAX,EBP
      140 Jne B45 P=0.000001 C=-1.000000
      140
      146 B15: # B8 <- B14 Freq: 1.37622
      146 MOV [ESP + #8],EBX
      14a MOV [ESP + #16],ESI
      14e MOV [ESP + #12],EDX
      152 MOV EBP,[ESP + #20]
      156 JMP B8
      156
      15b B16: # B57 B17 <- B9 Freq: 1.37622e+06
      15b CMPu ESI,EAX
      15d Jge,u B57 P=0.000001 C=-1.000000
      15d

        Attachments

          Issue Links

            Activity

              People

              • Assignee:
                kvn Vladimir Kozlov
                Reporter:
                kvn Vladimir Kozlov
              • Votes:
                0 Vote for this issue
                Watchers:
                0 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved:
                  Imported:
                  Indexed: