[RTEMS Project] #4712: powerpc: Add AltiVec VRSAVE support

[RTEMS trac]

#4712: powerpc: Add AltiVec VRSAVE support
-----------------------------+------------------------------
 Reporter:  Sebastian Huber  |       Owner:  Sebastian Huber
     Type:  enhancement      |      Status:  assigned
 Priority:  normal           |   Milestone:  6.1
Component:  arch/powerpc     |     Version:  6
 Severity:  normal           |  Resolution:
 Keywords:                   |  Blocked By:
 Blocking:                   |
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Comment (by Sebastian Huber <sebastian.huber@…>):

 In [changeset:"d907c2294a438f07099730b88ff88a659e940de7/rtems"
 d907c22/rtems]:
 {{{
 #!CommitTicketReference repository="rtems"
 revision="d907c2294a438f07099730b88ff88a659e940de7"
 powerpc: Add support for VRSAVE

 The VRSAVE feature of the Altivec unit can be used to reduce the amount of
 Altivec registers which need to be saved/restored during interrupt
 processing
 and context switches.

 In order to use the VRSAVE optimization a corresponding multilib
 (-mvrsave) is
 required, see GCC configuration.  The -mvrsave option must be added to the
 ABI_FLAGS of the BSP.

 Currently only the -mcpu=e6500 based QorIQ BSP support this optimization.

 Update #4712.
 }}}

--
Ticket URL: <http://devel.rtems.org/ticket/4712#comment:2>
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