CODEWITHSUNDEEP
iphonexcodeneon
Krav
Krav

Reputation: 61

How to enable Neon instruction in Xcode

I want to use Neon SIMD instruction for the iphone. I heard we have to put flags "-mfloat-abi=softfp -mfpu=neon" in the "Other C Flags" field of the Target inspector, but when building I get "error: unrecognized command line option "-mfpu=neon"" .

Is there anything else special that has to be done to allow this flag? (I have Xcode 3.2.1 and iphone sdk 3.1.3)

Thanks !!

Upvotes: 6

Views: 7975

Answers (2)

Jake 'Alquimista' LEE
Jake 'Alquimista' LEE

Reputation: 6354

NEON is enabled by default.

The target has to be ARMv7 for that. (3GS or later)

In order to utilize NEON, the easiest way is writing assembly codes with NEON instructions.

It isn't that hard. ARM provides NEON guide in PDF on their homepage.

Upvotes: 1

Nick Toumpelis
Nick Toumpelis

Reputation: 2714

The NEON set is an extension on the Cortex-A series, therefore not supported in iPhone 3G. You probably cannot specify this directly.

Upvotes: 1

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