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  1. JDK
  2. JDK-6245564

Problem with Hotspot C2-compiled code calling long to float conversion on US-III and IV in Java 1.5

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    • Subcomponent:
    • CPU:
      sparc
    • OS:
      solaris_9

      Description


      Hotspot-compiled code on UltraSparcIII and IV can make bad conversions from long to float. It passes arguments incorrectly to SharedRuntime::l2f .

      Problem is in 1.5.0_02 and not in 1.4.2_07.

      Simple testcase below. Problem output:

      (5.10)$ java -server -Xcomp Test
      result 0 = 40.0
      result 1 = 1.71798757E11
      result 2 = 1.71798757E11
      result 3 = 1.71798757E11
      ...testcase continues (showing wrong answers)...

      problem: java -server -Xcomp Test
      no problem: java -client -Xcomp Test

      The testcase pauses for a keypress, for attaching debuggers.

      Problem happens on US-III+ and US-IV, not on an Ultra-1, for example.

      Testcase code below, attached is a version with additional comments.

      ----- start of testcase
      $ cat Test.java

      class Test {

              float [] fresults = new float[50];
              int fc = 0;

      // variable names copied from SizeRequirements.java's expandedTile function:

              private void smallTest (int allocated, long min, long pref, long max ) {
                      float totalPlay = Math.min(allocated - pref, max - pref);
                      fresults[fc] = totalPlay;
                      fc++;
              }


              public Test() {

              for (int i=0; i<5; i++) {
                      smallTest(88, 48, 48, 65582);
                      smallTest(88, 48, 48, 65582);
                      smallTest(88, 48, 48, 65582);
              }
              for (int i=0; i<15; i++) {
                      System.out.println("result " + i + " = " + fresults[i]);
              }

              try {
                      int x = System.in.read();
              } catch (Exception e) {
              }

              fc = 0;
              for (int i=0; i<5; i++) {
                      smallTest(88, 48, 48, 65582);
                      smallTest(88, 48, 48, 65582);
                      smallTest(88, 48, 48, 65582);
              }
              for (int i=0; i<15; i++) {
                      System.out.println("result " + i + " = " + fresults[i]);
              }

              } // end constructor

              public static void main(String [] args) {
                      Test t = new Test();
              } // end main



      } // end class



      ----- end of testcase


      This bug has a graphic side effect:

      Swing menus are blank with -server -Xcomp in Java 1.5 on UltraSparcIII and IV.

      .jpg attached.

      Pull-down menus in Swing applications are blank in Java 1.5, if running with the JVM option -Xcomp.


      Testcase:
      java -server -Xcomp -jar ..../demo/jfc/SwingSet2/SwingSet2.jar

      Workaround:

       .hotspot_compiler
      exclude javax/swing/SizeRequirements expandedTile

      ----------------------------------------------------
      ###@###.### 2005-03-24 16:40:46 GMT

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              Assignee:
              rasbold Chuck Rasbold
              Reporter:
              kevinw Kevin Walls
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                Updated:
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