On 21 November 2012 03:26, Michael Hope <michael.h...@linaro.org> wrote:
> On 20 November 2012 22:10, Zhenqiang Chen <zhenqiang.c...@linaro.org> wrote:
>> Hi,
>>
>> I try ARM, MIPS, PowerPC and X86 on povray benchmark. No one can
>> shrink-wrap function Ray_In_Bound.
>>
>> Here is:
>> bool Ray_In_Bound (RAY *Ray, OBJECT *Bounding_Object)
>> {
>> ...
>> for (Bound = Bounding_Object; Bound != NULL; Bound = Bound->Sibling)
>> {...}
>> return (true);
>> }
>> For ARM O2/O3, "Bound" is allocated to "r6" during ira. So there is copy
>>
>> r6 = r1 before
>> testing Bound != NULL
>
> Could you hack the benchmark to make the early exit explicit and see
> if that changes the result? That lets us know if improving shrink
> wrap is worthwhile.
>
> Something like:
>
> bool Ray_In_Bound (RAY *Ray, OBJECT *Bounding_Object)
> {
> if (Bounding_Object == NULL) return true;
I had tried it. The result is the same with the original one. (The
hack code is optimized)
Thanks!
-Zhenqiang
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