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68 lines
1.3 KiB
68 lines
1.3 KiB
8 years ago
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#include <AudioStream.h>
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.cpu cortex-m4
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.syntax unified
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.thumb
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.text
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.align 2
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/* void memcpy_tointerleaveLRwLen(short *dst, short *srcL, short *srcR, short len); */
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.global memcpy_tointerleaveLRwLen
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.thumb_func
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memcpy_tointerleaveLRwLen:
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@ r0: dst
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@ r1: srcL
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@ r2: srcR
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@ r3: len
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#if AUDIO_BLOCK_SAMPLES > 8
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push {r4-r11,r14}
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// add r14,r0,#(AUDIO_BLOCK_SAMPLES*2)
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add r14,r0,r3 //add the number of samples (which is 1/4 of the 16-bit words to move)
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add r14,r14,r3 //again (half)
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add r14,r14,r3 //again (3/4)
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add r14,r14,r3 //again (all)
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.align 2
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.loopLR:
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//Load 2*4 words
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ldmia r1!, {r5,r7,r9,r11} //1+4
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ldmia r2!, {r6,r8,r10,r12} //1+4
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pkhbt r3,r5,r6,LSL #16 //1
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pkhtb r4,r6,r5,ASR #16 //1
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pkhbt r5,r7,r8,LSL #16 //1
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pkhtb r6,r8,r7,ASR #16 //1
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pkhbt r7,r9,r10,LSL #16 //1
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pkhtb r8,r10,r9,ASR #16 //1
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pkhbt r9,r11,r12,LSL #16 //1
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pkhtb r10,r12,r11,ASR #16 //1
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//Write 8 Words
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stmia r0!, {r3,r4,r5,r6,r7,r8,r9,r10} //1+8 -> 5+5+8+9 = 27 Cycles to interleave 32 bytes.
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cmp r14, r0
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bne .loopLR
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pop {r4-r11,r14}
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#elif AUDIO_BLOCK_SAMPLES == 8
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push {r4-r8,r14}
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ldmia r1!, {r5,r7}
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ldmia r2!, {r6,r8}
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pkhbt r3,r5,r6,LSL #16
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pkhtb r4,r6,r5,ASR #16
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pkhbt r5,r7,r8,LSL #16
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pkhtb r6,r8,r7,ASR #16
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stmia r0!, {r3,r4,r5,r6}
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pop {r4-r8,r14}
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#endif
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BX lr
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