Michael Felt <aixto...@felt.demon.nl> added the comment:
I have been experimenting with different hardware and AIX versions. When building on AIX 5.3 - and the oldest libraries - test_math passes. When I run the test on POWER8, using either xlc or gcc test_math fails with just one element of the test. When I run the test on POWER6 I get many more errors - that I never had before. These are all after OS updates (I was not going to build for AIX 5.3 any more). An idea I have now - that may explain the sudden change in behavior is if the libraries have been optimized to always use the DFP (decimal floating point) internally - for what, from the application perspective - is the normal - no HW acceleration for FP - interface. I know there are ways to 'discover' this, but I'll need to write some tests so that I can see - if linking to different libraries actuates DFP performance counters yes and no. At this point - this feels like the a potential explanation. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue42323> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
