Autotuning fails on AMD drivers

[bmerry]

Reported by a user:

Tuning scan for uchar elements on Barts
!!!!!!!!!FATAL ERROR: no suitable kernel found!

Reported by: bmerry

Original Ticket: clogs/tickets/23

[bmerry]

• priority changed from blocker to major
• summary changed from Autotuning fails on Barts to Autotuning fails on AMD drivers

The original failure was due to a compiler bug in outdated AMD drivers. It now seems there is an intermittent segfault during tuning. The user originally hit it while tuning on Barts; I've not been able to reproduce that, but I've hit a segfault on the same machine while tuning for the CPU device.

Original comment by: bmerry

[bmerry]

• status changed from new to closed
• resolution set to fixed

The follow-up segfault is a bug in the AMD APP SDK, which still exists in v2.9 (it doesn't properly handle 3-element types as kernel arguments). I've reported the bug to AMD, and put in a workaround in 1.2.2.

Original comment by: bmerry