92 lines
1.9 KiB
C
92 lines
1.9 KiB
C
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/*
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* Replacements for common memory block managing functions.
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*
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* 30.08.2016 (dd.mm.yyyy)
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*/
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// TOP
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// TODO(allen): make these as fast as possible
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// with per architecture implementations.
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void
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block_copy(void *a, void *b, int32_t size){
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int32_t size8 = size/8;
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uint64_t *a8 = (uint64_t*)a;
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uint64_t *b8 = (uint64_t*)b;
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uint64_t *a8_end = a8 + size8;
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uint8_t *a1 = 0, *b1 = 0;
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for (;a8 < a8_end; ++a8, ++b8){
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*a8 = *b8;
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}
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a1 = (uint8_t*)a8;
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b1 = (uint8_t*)b8;
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switch (size % 8){
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case 7: *a1++ = *b1++;
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case 6: *a1++ = *b1++;
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case 5: *a1++ = *b1++;
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case 4: *a1++ = *b1++;
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case 3: *a1++ = *b1++;
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case 2: *a1++ = *b1++;
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case 1: *a1 = *b1;
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}
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}
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int64_t
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block_compare(void *a, void *b, int32_t size){
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int64_t r = 0;
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int32_t size8 = size/4;
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uint32_t *a8 = (uint32_t*)a;
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uint32_t *b8 = (uint32_t*)b;
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uint32_t *a8_end = a8 + size8;
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uint8_t *a1 = 0, *b1 = 0;
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for (;a8 < a8_end; ++a8, ++b8){
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if (*a8 != *b8){
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r = (*a8 - *b8);
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goto end;
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}
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}
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a1 = (uint8_t*)a8;
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b1 = (uint8_t*)b8;
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switch (size % 4){
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case 3: if (*a1 != *b1){r = (*a1 - *b1); goto end;} ++a1, ++b1;
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case 2: if (*a1 != *b1){r = (*a1 - *b1); goto end;} ++a1, ++b1;
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case 1: if (*a1 != *b1){r = (*a1 - *b1); goto end;}
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}
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end:;
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return(r);
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}
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void
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block_zero(void *a, int32_t size){
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int32_t size8 = size/8;
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uint64_t *a8 = (uint64_t*)a;
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uint64_t *a8_end = a8 + size8;
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uint8_t *a1 = 0;
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for (;a8 < a8_end; ++a8){
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*a8 = 0;
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}
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a1 = (uint8_t*)a8;
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switch (size % 8){
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case 7: *a1++ = 0;
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case 6: *a1++ = 0;
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case 5: *a1++ = 0;
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case 4: *a1++ = 0;
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case 3: *a1++ = 0;
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case 2: *a1++ = 0;
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case 1: *a1 = 0;
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}
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}
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// BOTTOM
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