ARM NEON assembler error: “instruction cannot be conditional”

Question

According to the arm info center vadd can be executed condtitionally however when i try

vaddeq.f32 d0,d0,d1

Xcode returns

65:i         


        

Answer 1

The ARM Architecture Reference Manual says:

 An ARM Advanced SIMD VADD instruction must be unconditional.

I.e., if you're in ARM mode, those instructions are not conditional. You can use them conditionally in Thumb-2 if you put them in an IT block.

  .syntax unified
  .code 16
  .globl _foo
_foo:
  cmp r0, #0
  it eq
  vaddeq.f32 d0, d0, d1
  bx lr