On Thu, Sep 18, 2014 at 11:55:31PM +0100, Russell King - ARM Linux wrote:

On Thu, Sep 18, 2014 at 02:43:12PM -0700, Stephen Boyd wrote:

quoted

From: Stepan Moskovchenko <redacted>

Certain ARM CPU implementations (e.g. Cortex-A15) may not raise a
floating- point exception whenever deprecated short-vector VFP
instructions are executed. Instead these instructions are treated
as UNALLOCATED. Change the VFP exception handling code to emulate
short-vector instructions even if FPEXC exception bits are not
set.

Purely out of interest, how much use do these instructions have in
real programs?

They're seldom used, but there are apps in the app store that use short
vectors to play music.

Will