Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-6482634

storeI_reversed still spill on stack for pre- and post-loop

    Details

    • Subcomponent:
    • Introduced In Build:
      b02
    • Introduced In Version:
      7
    • CPU:
      sparc
    • OS:
      generic

      Description

      See Test.java of test/compiler/6431242, the function:
        public void test_copy_longs_store_reversed(long[] dst, long[] src) {
          for(int i=0; i<src.length; i++) {
            dst[i] = Long.reverseBytes(1 + src[i]);
          }
        }

      -XX:PrintOptoAssembly :
      02c B3: # B16 B4 <- B2 B6 Loop: B3-B6 inner stride: not constant pre of N164 Freq: 13469.202c + SLL R
      _L5,#2,R_L2
      030 + CMP R_L5,R_L1 ! unsigned
      034 BPuge icc_U,B16 P=0.000001 C=-1.000000
      034 ADD R_I2,R_L2,R_L0
      034
      03c B4: # B15 B5 <- B3 Freq: 13469.2
      03c + LDUW [R_L0 + #12],R_L0
      040 + ADD R_L0,#1,R_L3
      044 + STW R_L3,[SP + #64] !stk
      048 + LDUWA [SP + #64], R_L4 !asi
      050 LDUW [R_I1 + #8],R_L3 ! range
      054 NullCheck R_I1
      054
      054 B5: # B14 B6 <- B4 Freq: 13469.1
      054 + CMP R_L5,R_L3 ! unsigned
      058 BPuge icc_U,B14 P=0.000001 C=-1.000000
      058
      060 B6: # B3 B7 <- B5 Freq: 13469.1
      060 + ADD R_I1,R_L2,R_L2
      064 + ADD R_L5,#1,R_L5
      068 + CMP R_L5,#1
      06c BPlt ccr,B3 ! Loop end P=0.888820 C=7131.000000
      06c STW R_L4,[R_L2 + #12]

      The problem for pre- and post- loop where generated code still spill on stack first and read back reversely. The expected result is take the addI(P) result and store byte reversely into destination.
      test_copy_ints_store_reversed and test_copy_long_store_reversed have same result.

        Attachments

          Issue Links

            Activity

              People

              • Assignee:
                Unassigned
                Reporter:
                minqi Yumin Qi
              • Votes:
                0 Vote for this issue
                Watchers:
                0 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Imported:
                  Indexed: