2023-03-09 21:35:56 -08:00
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; To be embedded within the IRQ handler.
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Push DX
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Cmp CS:Stereo, 0
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JNE TransferStereoBufferMMX
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TransferMonoBufferMMX: ; DX = number of 32 bit numbers -> 16 bit.
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Push DX
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ShR DX, 3
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JZ TransferMonoBufferMMX2
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TransferMonoBufferMMX1:
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MovD MM0, [SI]
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MovD MM4, [SI+8]
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MovD MM1, [SI+10h]
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PUnpckLDQ MM0, MM4
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MovD MM5, [SI+18h]
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PSRADI MM0, 13
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MovD MM2, [SI+20h]
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PUnpckLDQ MM1, MM5
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MovD MM6, [SI+28h]
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PSRADI MM1, 13
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MovD MM3, [SI+30h]
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PUnpckLDQ MM2, MM6
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MovD MM7, [SI+38h]
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PSRADI MM2, 13
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PUnpckLDQ MM3, MM7
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PackSSDW MM0, MM1
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PSRADI MM3, 13
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MovQM [DI], MM0
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PackSSDW MM2, MM3
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MovQM [DI+8], MM2
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Add SI, 40h
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Add DI, 10h
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Dec DX
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JNZ TransferMonoBufferMMX1
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TransferMonoBufferMMX2:
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Pop CX
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Mov DX, CX
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And CX, 7
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JZ TransferMonoBufferMMX4
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TransferMonoBufferMMX3:
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MovD MM0, [SI]
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PSRADI MM0, 13
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PackSSDW MM0, MM1
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MovDR AX, MM0
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StosW
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Add SI, 8
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Loop TransferMonoBufferMMX3
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TransferMonoBufferMMX4:
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Jmp MMXMixTransferEnd
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TransferStereoBufferMMX: ; DX is always an even number for stereo
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Push DX
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ShR DX, 3
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JZ TransferStereoBufferMMX2
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TransferStereoBufferMMX1: ; DX = number of 32 bit numbers -> 16 bit
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MovQ MM0, [SI]
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MovQ MM1, [SI+10h]
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PSRADI MM0, 12
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MovQ MM2, [SI+8]
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PSRADI MM1, 12
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MovQ MM3, [SI+18h]
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PSRADI MM2, 12
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PackSSDW MM0, MM2
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PSRADI MM3, 12
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MovQM [DI], MM0
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PackSSDW MM1, MM3
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MovQM [DI+8], MM1 ; 8 values done.
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Add SI, 20h
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Add DI, 10h
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Dec DX
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JNZ TransferStereoBufferMMX1
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TransferStereoBufferMMX2:
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Pop CX
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Mov DX, CX
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And CX, 7
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ShR CX, 1 ; Always an even number!
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JZ TransferStereoBufferMMX4
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TransferStereoBufferMMX3:
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MovQ MM0, [SI]
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PSRADI MM0, 12
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PackSSDW MM0, MM1 ; Dummy register
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MovDM [DI], MM0
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Add SI, 8
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Add DI, 4
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Dec CX
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JNZ TransferStereoBufferMMX3
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TransferStereoBufferMMX4:
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MMXMixTransferEnd:
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Pop DX
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