ARM DSP: Halving parallel add/sub and multiply add/sub #535
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Add: - `shsub8`: Signed halving parallel byte-wise subtraction. - `shsub16`: Signed halving parallel halfword-wise subtraction.
- `shadd8`: Signed halving parallel byte-wise add. - `shadd16`: Signed halving parallel halfword-wise add.
- `SMUAD`: Signed Dual Multiply Add. - `SMUADX`: Signed Dual Multiply Add Reversed. - `SMUSD`: Signed Dual Multiply Subtract. - `SMUSDX`: Signed Dual Multiply Subtract Reversed.
Restrict everything to Cortex-A/R till We found a better way manage thumb* targets. Add 'dox' to generate docs.
Quote '[' and ']' where are not part of the Markdown syntax.
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First of this PR restrict everything to Cortex-A/R devices till We found a better way to manage
thumb*targets.Then add a set of halving parallel add/sub and multiply add/sub widely used in DSP algorithms:
shsub8: Signed halving parallel byte-wise subtraction.shsub16: Signed halving parallel halfword-wise subtraction.shadd8: Signed halving parallel byte-wise add.shadd16: Signed halving parallel halfword-wise add.smuad: Signed dual multiply add.smuadx: Signed dual multiply add reversed.smusd: Signed dual multiply subtract.smusdx: Signed dual multiply subtract reversed.