>> The likely cause is __float128 operations being performed as "double >> precision" >> of two __float80 by the Intel math library for x86_64. Memcheck-3.8.1 >> implements >> __float80 operations as __float64 (ordinary IEEE-754 'double'.)
> Thanks for analyzing this! I assume this means that a fix will be rather > complex? Nearly every user whose programs utilize 80-bit x86 floating point is disappointed by memcheck's 64-bit implementation of 80-bit operations. This situation is many years old. The fix requires a major effort of design and implementation. If all of your use of 80-bit operations on x86 is indirect as the result of __float128, then perhaps you could run on s390, where memcheck has good support for the 128-bit hardware floating point. -- ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60133471&iu=/4140/ostg.clktrk _______________________________________________ Valgrind-users mailing list Valgrind-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/valgrind-users
