RFR: aarch32: Another version of SoftFP implementation

[Edward Nevill]

On Thu, 2016-10-27 at 12:43 +0000, Sergey Nazarkin wrote:
> Hi Ed,
> 
> I’ve updated webrev  and introduce UseFPU variable 
> http://cr.openjdk.java.net/~snazarki/softfp/src/cpu/aarch32/vm/globals_aarch32.hpp.sdiff.html
> http://cr.openjdk.java.net/~snazarki/softfp/src/cpu/aarch32/vm/vm_version_aarch32.hpp.sdiff.html
> 

Hi Sergey,

The logic here seems broken? Or maybe I am misunderstanding something?

from globals_aarch32.hpp

 100   product(bool, UseFPU, true, "Enable FPU utilization at floating point ops." \
 101       "Affects SoftFP mode only.")

So UseFPU defaults to true.

from vm_version_aarch32.hpp

  88 #ifdef HARD_FLOAT_CC
  89 inline const bool hasFPU(void) { return true; }
  90 #else
  91 inline bool hasFPU(void) { return (UseFPU); }
  92 #endif
  93 
  94

So by default hasFPU returns true in both cases. This will cause problems running on a genuine FPU less target?

If you want to push without this change that is fine, I can submit a subsequent patch to add the UseFPU option.

All the best,
Ed.