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  1. JDK
  2. JDK-8275202

C2: optimize out more redundant conditions

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    Description

      In patterns like:

      if (i >= 42) {
        if (i < 10) {

      the second test is not optimized out.
      This is also related to JDK-8272562 where a CastII optimizes to top on a branch that's never taken but optimized out.

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          duplicates

          Enhancement - null JDK-8324793 Fold simple range checks

          • P5 - Cosmetic problem like misspelt words or misaligned text.
          • Closed
          relates to

          Enhancement - null JDK-8263252 Improve fold_compares c2 optimizations

          • P3 - Major loss of function.
          • Open

          Enhancement - null JDK-8211518 C2 should optimize if diamonds that feed into Phis merging the same value

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • In Progress

          Bug - A problem which impairs or prevents the functions of the product. JDK-8321097 C2: Broken graph due to dying Cast nodes while control cannot be removed

          • P3 - Major loss of function.
          • Closed

          Enhancement - null JDK-8264879 Optimize out redundant ifs for constant test.

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Open

          Enhancement - null JDK-8303970 C2 can not merge homogeneous adjacent two If

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Open

          Enhancement - null JDK-8307768 Constant fold IfNode's based on domination information

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Open

          Enhancement - null JDK-8325674 Constant fold across compares

          • P5 - Cosmetic problem like misspelt words or misaligned text.
          • Open
          links to

          Review Review openjdk/jdk/14586

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              roland Roland Westrelin
              roland Roland Westrelin
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              Dates

                Created:
                Updated: