On Tue, Oct 9, 2012 at 5:21 PM, Matthew Gretton-Dann <
matthew.gretton-d...@linaro.org> wrote:
> On 9 October 2012 11:58, Jubi Taneja <jubitan...@gmail.com> wrote:
> > Hi Matt,
> >
> > Thanks for sharing the information.
> >
> > On Tue, Oct 9, 2012 at 3:51 PM, Matthew Gretton-Dann
> > <matthew.gretton-d...@linaro.org> wrote:
> >>
> >> On 9 October 2012 10:37, Jubi Taneja <jubitan...@gmail.com> wrote:
> >> > Hi All,
> >> >
> >> > I wanted to see the difference in objdump of an application where I
> can
> >> > make
> >> > the difference between the VFPV3 and VFPV4 support. I tried enabling
> the
> >> > flag -mfpu=vfpv3 and -mfpu=vfpv4 for ARM Cortex A15 toolchain in my
> test
> >> > code but cannot see the difference in two objdumps.
> >>
> >> Try the following (tested against FSF GCC:
> >>
> >> /* arm-none-linux-gnueabi-gcc -mcpu=cortex-a15 -mfpu=vfpv4 -S -o-
> >> /tmp/fma.c -mfloat-abi=hard -O2 */
> >> float f(float a, float b, float c)
> >> {
> >> return a * b + c;
> >> }
> >> /* end of tmp.c */
> >>
> >> (Note that -mfloat-abi=softfp will also work in this example. Which
> >> one you want to use depends on whether you have configured your system
> >> for hard or soft-float ABIs).
> >>
> > I checked both with -mfpu=vfpv3 and -mfpu=vfpv4 and it generates the same
> > assembly code. VMLA insn is emitted for both the cases. I was wondering
> if I
> > can get any test case so that I may observe the difference in the two
> > objdumps.
>
> Which compiler are you using? VFMA support is only in trunk FSF GCC.
> Linaro has not yet backported support to 4.7.
>
I am using FSF GCC only.
>
> Thanks,
>
> Matt
>
> --
> Matthew Gretton-Dann
> Linaro Toolchain Working Group
> matthew.gretton-d...@linaro.org
>
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