Define CAN_USE_VFP2/3_INSTRUCTIONS based on arm_neon and arm_fpu flags.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 03a0ecafddaf306d0ab439770dc982e3fc45b6de..7b51ab0acfd937bf2bf8fdc6515f6cfff83c3cfd 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -143,12 +143,14 @@
               'CAN_USE_UNALIGNED_ACCESSES=0',
             ],
           }],
-          [ 'v8_can_use_vfp2_instructions=="true"', {
+          # NEON implies VFP3 and VFP3 implies VFP2.
+          [ 'v8_can_use_vfp2_instructions=="true" or arm_neon==1 or arm_fpu=="vfpv3" or arm_fpu=="vfpv3-d16"', {

[Jakob Kummerow, 2012/12/07 15:03:45]

nit: 80 columns please. You can use \ at the end of the line.

Again below.

[ulan, 2012/12/07 15:08:54]

Done.

             'defines': [
               'CAN_USE_VFP2_INSTRUCTIONS',
             ],
           }],
-          [ 'v8_can_use_vfp3_instructions=="true"', {
+          # NEON implies VFP3.
+          [ 'v8_can_use_vfp3_instructions=="true" or arm_neon==1 or arm_fpu=="vfpv3" or arm_fpu=="vfpv3-d16"', {
             'defines': [
               'CAN_USE_VFP3_INSTRUCTIONS',
             ],