On 11/08/13 09:02, Måns Rullgård wrote:
> Stephen Boyd writes:
>
>> +int __aeabi_idiv(int numerator, int denominator)
>> +{
>> +if (static_key_false(&cpu_has_idiv)) {
>> +int ret;
>> +
>> +asm volatile (
>> +".arch_extension idiv\n"
>> +"sdiv %0,
On 11/08/13 08:52, Russell King - ARM Linux wrote:
> On Fri, Nov 08, 2013 at 10:58:42AM +0100, Jean-Christophe PLAGNIOL-VILLARD
> wrote:
>> On 11:20 Thu 07 Nov , Stephen Boyd wrote:
>>> @@ -381,6 +384,13 @@ static void __init cpuid_init_hwcaps(void)
>>> elf_hwcap |= HWCAP_IDIVT;
>>
On 11/08/13 08:48, Christopher Covington wrote:
> Hi Stephen,
>
> On 11/07/2013 02:20 PM, Stephen Boyd wrote:
>> If we're running on a v7 ARM CPU, detect if the CPU supports the
>> sdiv/udiv instructions and replace the signed and unsigned
>> division library functions with an sdiv/udiv instruction
On 11/08/13 08:54, Russell King - ARM Linux wrote:
> On Fri, Nov 08, 2013 at 12:50:04PM +0100, Jean-Christophe PLAGNIOL-VILLARD
> wrote:
>> On 19:34 Thu 07 Nov , Rob Herring wrote:
>>> On Thu, Nov 7, 2013 at 1:20 PM, Stephen Boyd wrote:
If we're running on a v7 ARM CPU, detect if the CPU
Stephen Boyd writes:
> +int __aeabi_idiv(int numerator, int denominator)
> +{
> + if (static_key_false(&cpu_has_idiv)) {
> + int ret;
> +
> + asm volatile (
> + ".arch_extension idiv\n"
> + "sdiv %0, %1, %2"
> + : "=&r" (ret)
There
On Fri, Nov 08, 2013 at 12:50:04PM +0100, Jean-Christophe PLAGNIOL-VILLARD
wrote:
> On 19:34 Thu 07 Nov , Rob Herring wrote:
> > On Thu, Nov 7, 2013 at 1:20 PM, Stephen Boyd wrote:
> > > If we're running on a v7 ARM CPU, detect if the CPU supports the
> > > sdiv/udiv instructions and replace
On Fri, Nov 08, 2013 at 10:58:42AM +0100, Jean-Christophe PLAGNIOL-VILLARD
wrote:
> On 11:20 Thu 07 Nov , Stephen Boyd wrote:
> > @@ -381,6 +384,13 @@ static void __init cpuid_init_hwcaps(void)
> > elf_hwcap |= HWCAP_IDIVT;
> > }
> >
> > +#ifdef CONFIG_THUMB2_KERNEL
> if (IS_
Hi Stephen,
On 11/07/2013 02:20 PM, Stephen Boyd wrote:
> If we're running on a v7 ARM CPU, detect if the CPU supports the
> sdiv/udiv instructions and replace the signed and unsigned
> division library functions with an sdiv/udiv instruction.
[...]
> +++ b/arch/arm/lib/div-v7.c
> @@ -0,0 +1,58
On 19:34 Thu 07 Nov , Rob Herring wrote:
> On Thu, Nov 7, 2013 at 1:20 PM, Stephen Boyd wrote:
> > If we're running on a v7 ARM CPU, detect if the CPU supports the
> > sdiv/udiv instructions and replace the signed and unsigned
> > division library functions with an sdiv/udiv instruction.
>
>
On 11:20 Thu 07 Nov , Stephen Boyd wrote:
> If we're running on a v7 ARM CPU, detect if the CPU supports the
> sdiv/udiv instructions and replace the signed and unsigned
> division library functions with an sdiv/udiv instruction.
>
> Running the perf messaging benchmark in pipe mode
>
> $ pe
On Thu, Nov 7, 2013 at 1:20 PM, Stephen Boyd wrote:
> If we're running on a v7 ARM CPU, detect if the CPU supports the
> sdiv/udiv instructions and replace the signed and unsigned
> division library functions with an sdiv/udiv instruction.
[snip]
> diff --git a/arch/arm/lib/Makefile b/arch/arm/l
If we're running on a v7 ARM CPU, detect if the CPU supports the
sdiv/udiv instructions and replace the signed and unsigned
division library functions with an sdiv/udiv instruction.
Running the perf messaging benchmark in pipe mode
$ perf bench sched messaging -p
shows a modest improvement on m
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