On Thursday 14 July 2016 10:32:48 Thomas Preudhomme wrote: > On Friday 08 July 2016 09:05:55 Mike Stump wrote: > > On Jul 8, 2016, at 8:07 AM, Thomas Preudhomme > > <thomas.preudho...@foss.arm.com> wrote: > > > While investigating the root cause a testsuite regression for the > > > ARM/embedded-5-branch GCC in gcc.dg/vect/slp-perm-5.c, we found that the > > > bug seems to also affect trunk. > > > > Hum... If in 6.x, and safe to back port to 6, a back port would be > > nice... > > I use LRA in 6.x, and seems like I'd be susceptible to this sort of thing, > > but, I didn't test it. > > It should affect 6.x as well yes since there is no special protection > against it in the code being modified. However I only ever managed to > reproduce this on the ARM/embedded-5-branch.
I've created PR71878 for this problem with more details on how to reproduce the issue. it only requires to backport a single commit to gcc-5-branch, build gcc for arm-none-eabi (make all-gcc is enough) and compile the testcase attached in the PR with the given options. Please let me know if you need any more details. Best regards, Thomas
