You have been subscribed to a public bug: On Little Endian systems, GCC performs optimizations to remove unnecessary element reversals of vectors that are sometimes required to adjust for behavior of the lxvd2x, etc., instructions. In one not uncommon case, such optimizations are defeated when we perform a vector convert from double-precision to single-precision followed by a vector splat word. I have pushed patches upstream to fix this, implemented using the following revisions:
GCC trunk (6.0): 222351 GCC 5.1: 222394 GCC 4.9: 222420 GCC 4.8: 222427 I would like to see the backported patch applied to the gcc shipped with the Ubuntu 15.10 release. We should probably have a conversation about the next service pack for the 14.04 LTS release as well. ** Affects: gcc-4.8 (Ubuntu) Importance: Undecided Assignee: Matthias Klose (doko) Status: In Progress ** Tags: architecture-ppc64le bot-comment bugnameltc-124330 severity-medium targetmilestone-inin1510 -- [Ubuntu 15.10] gcc: Optimize swap removal in presence of floating-point vector convert/splat sequence https://bugs.launchpad.net/bugs/1449119 You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to gcc-4.8 in Ubuntu. -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp