55 lines
643 B
ArmAsm
55 lines
643 B
ArmAsm
.global _dsp_ldrc
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.global _dsp_padd
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.global _dsp_cpumul
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.global _dsp_loop
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_dsp_ldrc:
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/* Check that LDRC is available */
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ldrc #16
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rts
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nop
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_dsp_padd:
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/* Add some numbers */
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lds r4, x0
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lds r5, y0
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padd x0, y0, a0
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sts a0, r0
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rts
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nop
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_dsp_cpumul:
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/* Multiply stuff but use the CPU */
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lds r4, x0
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lds r5, y0
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/* Make it normal registers... (slow) */
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sts x0, r0
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sts y0, r1
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mul.l r0, r1
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/* Take result back directly to DSP (latency?) */
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psts macl, a0
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/* Return the result in r0 */
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sts a0, r0
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rts
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nop
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_dsp_loop:
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mov #1, r0
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lds r0, x0
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pclr y0
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ldrs 1f
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ldre 2f
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ldrc r4
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nop
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1:
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2:
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padd x0, y0, y0
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sts y0, r0
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rts
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nop
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