Embedded forum How to implement saturation instructions in ARMv8 architecture?

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How to implement saturation instructions in ARMv8 architecture?

Natesh Raina over 7 years ago

Is there a way to write an equivalent of 32-bit saturation instruction such as QADD or QSUB without using neon saturation instructions for Armv8 architecture?

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+1 Peter Rielly over 7 years ago in reply to Natesh Raina

Ah, sorry, I missed the intent of your question.

The only way to perform saturation in a single instruction is using the SIMD&FP instructions. They do have scalar variants (effectively ignoring all but a single lane - including for flag setting,) but they still operate on the FP register bank and set flags in FPSR rather than PSTATE.
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+1 Peter Rielly over 7 years ago in reply to Natesh Raina

Ah, sorry, I missed the intent of your question.

The only way to perform saturation in a single instruction is using the SIMD&FP instructions. They do have scalar variants (effectively ignoring all but a single lane - including for flag setting,) but they still operate on the FP register bank and set flags in FPSR rather than PSTATE.
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