CHG: Extracted @piwi's bucketsort into separate files under /common

common/radixsort.c

@@ -0,0 +1,99 @@
+#include "radixsort.h"
+
+uint64_t * radixSort(uint64_t * array, uint32_t size) {
+    rscounts_t counts;
+    memset(&counts, 0, 256 * 8 * sizeof(uint32_t));
+    uint64_t * cpy = (uint64_t *)malloc(size * sizeof(uint64_t));
+    uint32_t o8=0, o7=0, o6=0, o5=0, o4=0, o3=0, o2=0, o1=0;
+    uint32_t t8, t7, t6, t5, t4, t3, t2, t1;
+    uint32_t x;
+    // calculate counts
+    for(x = 0; x < size; ++x) {
+        t8 = array[x] & 0xff;
+        t7 = (array[x] >> 8) & 0xff;
+        t6 = (array[x] >> 16) & 0xff;
+        t5 = (array[x] >> 24) & 0xff;
+        t4 = (array[x] >> 32) & 0xff;
+        t3 = (array[x] >> 40) & 0xff;
+        t2 = (array[x] >> 48) & 0xff;
+        t1 = (array[x] >> 56) & 0xff;
+        counts.c8[t8]++;
+        counts.c7[t7]++;
+        counts.c6[t6]++;
+        counts.c5[t5]++;
+        counts.c4[t4]++;
+        counts.c3[t3]++;
+        counts.c2[t2]++;
+        counts.c1[t1]++;
+    }
+    // convert counts to offsets
+    for(x = 0; x < 256; ++x) {
+        t8 = o8 + counts.c8[x];
+        t7 = o7 + counts.c7[x];
+        t6 = o6 + counts.c6[x];
+        t5 = o5 + counts.c5[x];
+        t4 = o4 + counts.c4[x];
+        t3 = o3 + counts.c3[x];
+        t2 = o2 + counts.c2[x];
+        t1 = o1 + counts.c1[x];
+        counts.c8[x] = o8;
+        counts.c7[x] = o7;
+        counts.c6[x] = o6;
+        counts.c5[x] = o5;
+        counts.c4[x] = o4;
+        counts.c3[x] = o3;
+        counts.c2[x] = o2;
+        counts.c1[x] = o1;
+        o8 = t8; 
+        o7 = t7; 
+        o6 = t6; 
+        o5 = t5; 
+        o4 = t4; 
+        o3 = t3; 
+        o2 = t2; 
+        o1 = t1;
+    }
+    // radix
+    for(x = 0; x < size; ++x) {
+        t8 = array[x] & 0xff;
+        cpy[counts.c8[t8]] = array[x];
+        counts.c8[t8]++;
+    }
+    for(x = 0; x < size; ++x) {
+        t7 = (cpy[x] >> 8) & 0xff;
+        array[counts.c7[t7]] = cpy[x];
+        counts.c7[t7]++;
+    }
+    for(x = 0; x < size; ++x) {
+        t6 = (array[x] >> 16) & 0xff;
+        cpy[counts.c6[t6]] = array[x];
+        counts.c6[t6]++;
+    }
+    for(x = 0; x < size; ++x) {
+        t5 = (cpy[x] >> 24) & 0xff;
+        array[counts.c5[t5]] = cpy[x];
+        counts.c5[t5]++;
+    }
+    for(x = 0; x < size; ++x) {
+        t4 = (array[x] >> 32) & 0xff;
+        cpy[counts.c4[t4]] = array[x];
+        counts.c4[t4]++;
+    }
+    for(x = 0; x < size; ++x) {
+        t3 = (cpy[x] >> 40) & 0xff;
+        array[counts.c3[t3]] = cpy[x];
+        counts.c3[t3]++;
+    }
+    for(x = 0; x < size; ++x) {
+        t2 = (array[x] >> 48) & 0xff;
+        cpy[counts.c2[t2]] = array[x];
+        counts.c2[t2]++;
+    }
+    for(x = 0; x < size; ++x) {
+        t1 = (cpy[x] >> 56) & 0xff;
+        array[counts.c1[t1]] = cpy[x];
+        counts.c1[t1]++;
+    }
+    free(cpy);
+    return array;
+}