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  1. JDK
  2. JDK-8295159

DSO created with -ffast-math breaks Java floating-point arithmetic

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    • b23
    • generic

        A bug in GCC causes shared libraries linked with -ffast-math to disable denormal arithmetic. This breaks Java's floating-point semantics.

        The bug is https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55522

        One solution is to save and restore the floating-point control word around System.loadLibrary(). This isn't perfect, because some shared library might load another shared library at runtime, but it's a lot better than what we do now.

          1. libfast-math.c
            1 kB
          2. TestDenormalFloat.java
            2 kB

              aph Andrew Haley
              aph Andrew Haley
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