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NEON conditional execution

Note: This was originally posted on 17th February 2012 at http://forums.arm.com

Hi, I would like to perform the following operation simultaneously on 8x16bits registers:

Q0 = Q0 + Q1
if (Q0 >= Q2) Q0 = Q3

I am not clear if this is possible to do that ?
In normal mode, I know it is since the mov can be conditional, but in SIMD I don't know.

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Marcus Harnisch over 12 years ago

Note: This was originally posted on 17th February 2012 at http://forums.arm.com

This untested sequence should do what you want. Depending on the greater context you may be able to reuse some registers.
; Q0 = Q0 + Q1 VADD.U16 q0, q0, q1 ; if (Q0 >= Q2) Q0 = Q3 VCGE.U16 q4, q0, q2 VBIT q0, q3, q4
--
Marcus
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Marcus Harnisch over 12 years ago

Note: This was originally posted on 17th February 2012 at http://forums.arm.com

This untested sequence should do what you want. Depending on the greater context you may be able to reuse some registers.
; Q0 = Q0 + Q1 VADD.U16 q0, q0, q1 ; if (Q0 >= Q2) Q0 = Q3 VCGE.U16 q4, q0, q2 VBIT q0, q3, q4
--
Marcus
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