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35 lines
533 B
35 lines
533 B
/* Wrapper for the MMX version of peakval
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* Copyright 2004 Phil Karn, KA9Q
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*/
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#include <stdlib.h>
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int peakval_mmx_assist(signed short *,int);
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int peakval_mmx(signed short *b,int cnt){
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int peak = 0;
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int a;
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while(((int)b & 7) != 0 && cnt != 0){
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a = abs(*b);
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if(a > peak)
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peak = a;
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b++;
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cnt--;
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}
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a = peakval_mmx_assist(b,cnt);
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if(a > peak)
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peak = a;
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b += cnt & ~3;
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cnt &= 3;
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while(cnt != 0){
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a = abs(*b);
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if(a > peak)
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peak = a;
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b++;
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cnt--;
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}
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return peak;
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}
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