[Bug 1449120] [NEW] [Ubuntu 15.10] gcc: Ensure -m[no-]crypto affects the correct subset of POWER8 instructions

[Launchpad Bug Tracker]

You have been subscribed to a public bug:

gcc 4.8 introduces support for POWER8, which among other things adds
support for cryptography instructions (section 5.11 of the 2.07 POWER
ISA).  Availability of cryptography instructions is specified with
-m[no-]crypto.  However, this switch incorrectly affects availability of
ALL instructions in section 5.11, when in fact it should only control
code generation of instructions flagged as "Category:Vector.AES" or
"Category:Vector.SHA2".  I have patches upstream to fix this,
implemented with the following revisions:

GCC trunk (6.0):  222362, 222381
GCC 5.1:  222397
GCC 4.9:  222424
GCC 4.8:  222429

I would like to see the backported patch applied to the gcc shipped with
the Ubuntu 15.10 release.  We should also discuss applying it to the
next available service pack for the 14.04 LTS release.

** Affects: gcc-defaults (Ubuntu)
     Importance: Undecided
     Assignee: Matthias Klose (doko)
         Status: In Progress


** Tags: architecture-ppc64le bot-comment bugnameltc-124331 severity-medium targetmilestone-inin1510
-- 
[Ubuntu 15.10] gcc: Ensure -m[no-]crypto affects the correct subset of POWER8 instructions
https://bugs.launchpad.net/bugs/1449120
You received this bug notification because you are a member of Ubuntu Foundations Bugs, which is subscribed to gcc-defaults in Ubuntu.