5 files changed, 186 insertions, 7 deletions

diff --git a/src/nissy.h b/src/nissy.h
index 336130c..63e7a90 100644
--- a/src/nissy.h
+++ b/src/nissy.h
@@ -86,6 +86,13 @@ int64_t nissy_gendata(
         void *generated_data
 );
 
+/* Temporarily added to test h48 intermediate tables */
+int64_t nissy_derivedata(
+        const char *options,
+        const void *fulltable,
+        void *generated_data
+);
+
 /* Print information on a data table via the provided callback writer */
 int64_t nissy_datainfo(
         const void *table,
diff --git a/src/solvers/h48/gendata_h48.h b/src/solvers/h48/gendata_h48.h
index 3445570..a88eb4f 100644
--- a/src/solvers/h48/gendata_h48.h
+++ b/src/solvers/h48/gendata_h48.h
@@ -103,7 +103,7 @@ STATIC_INLINE bool gendata_h48k2_dfs_stop(cube_t, int8_t, h48k2_dfs_arg_t *);
 STATIC size_t gendata_h48k2_realcoord(gendata_h48_arg_t *);
 STATIC void gendata_h48k2_dfs(h48k2_dfs_arg_t *arg);
 STATIC void * gendata_h48k2_runthread(void *);
-STATIC tableinfo_t makeinfo_h48k2(gendata_h48_arg_t *, uint8_t);
+STATIC tableinfo_t makeinfo_h48k2(gendata_h48_arg_t *);
 
 STATIC uint32_t *get_cocsepdata_ptr(const void *);
 STATIC uint8_t *get_h48data_ptr(const void *);
@@ -112,6 +112,8 @@ STATIC_INLINE uint8_t get_h48_pval(const uint8_t *, int64_t, uint8_t);
 STATIC_INLINE void set_h48_pval(uint8_t *, int64_t, uint8_t, uint8_t);
 STATIC_INLINE uint8_t get_h48_bound(cube_t, uint32_t, uint8_t, uint8_t, uint8_t *);
 
+size_t gendata_h48_derive(uint8_t, const void *, void *);
+
 STATIC uint64_t
 gendata_h48short(gendata_h48short_arg_t *arg)
 {
@@ -387,7 +389,7 @@ gendata_h48k2(gendata_h48_arg_t *arg)
                 [11] = 10
         };
 
-        uint8_t t, selectedbase, *table;
+        uint8_t t, *table;
         int64_t j;
         uint64_t i, ii, inext, count;
         h48map_t shortcubes;
@@ -414,8 +416,9 @@ gendata_h48k2(gendata_h48_arg_t *arg)
         };
         gendata_h48short(&shortarg);
 
-        selectedbase = arg->base < 20 ? arg->base : base[arg->h];
-        arg->info = makeinfo_h48k2(arg, selectedbase);
+        if (arg->base >= 20)
+                arg->base = base[arg->h];
+        arg->info = makeinfo_h48k2(arg);
 
         inext = count = 0;
         pthread_mutex_init(&shortcubes_mutex, NULL);
@@ -425,7 +428,7 @@ gendata_h48k2(gendata_h48_arg_t *arg)
                 dfsarg[i] = (h48k2_dfs_arg_t){
                         .h = arg->h,
                         .k = arg->k,
-                        .base = selectedbase,
+                        .base = arg->base,
                         .shortdepth = shortdepth,
                         .cocsepdata = arg->cocsepdata,
                         .table = table,
@@ -637,7 +640,7 @@ gendata_h48k2_realcoord_runthread(void *arg)
 }
 
 STATIC tableinfo_t
-makeinfo_h48k2(gendata_h48_arg_t *arg, uint8_t base)
+makeinfo_h48k2(gendata_h48_arg_t *arg)
 {
         tableinfo_t info;
 
@@ -651,7 +654,7 @@ makeinfo_h48k2(gendata_h48_arg_t *arg, uint8_t base)
                 .classes = 0,
                 .h48h = arg->h,
                 .bits = 2,
-                .base = base,
+                .base = arg->base,
                 .maxvalue = 3,
                 .next = 0,
         };
@@ -695,3 +698,81 @@ get_h48_bound(cube_t cube, uint32_t cdata, uint8_t h, uint8_t k, uint8_t *table)
         coord = coord_h48_edges(cube, COCLASS(cdata), TTREP(cdata), h);
         return get_h48_pval(table, coord, k);
 }
+
+size_t
+gendata_h48_derive(uint8_t h, const void *fulltable, void *buf)
+{
+        size_t cocsepsize, h48size;
+        uint8_t val_full, val_derive, val_new, *h48full, *h48derive;
+        int64_t i, j, h48max;
+        gendata_h48_arg_t arg;
+        tableinfo_t cocsepinfo, fulltableinfo;
+
+        /* Initializing values in case of error */
+        fulltableinfo.bits = 2;
+        fulltableinfo.base = 8;
+
+        readtableinfo_n(fulltable, 2, &fulltableinfo);
+        arg.h = h;
+        arg.k = fulltableinfo.bits;
+        arg.maxdepth = 20;
+        arg.buf = buf;
+        arg.cocsepdata = (uint32_t *)((char *)buf + INFOSIZE);
+        arg.base = fulltableinfo.base;
+        arg.info = makeinfo_h48k2(&arg);
+
+        /* Technically this step is redundant, except that we
+           need selfsim and crep */
+        cocsepsize = gendata_cocsep(buf, arg.selfsim, arg.crep);
+        arg.h48buf = (char *)buf + cocsepsize;
+        h48size = H48_TABLESIZE(h, arg.k) + INFOSIZE;
+
+        if (buf == NULL)
+                goto gendata_h48_derive_return_size;
+
+        if (!readtableinfo(buf, &cocsepinfo)) {
+                LOG("gendata_h48: could not read info for cocsep table\n");
+                goto gendata_h48_derive_error;
+        }
+
+        cocsepinfo.next = cocsepsize;
+        if (!writetableinfo(&cocsepinfo, buf)) {
+                LOG("gendata_h48_derive: could not write info for cocsep table"
+                    " with updated 'next' value\n");
+                goto gendata_h48_derive_error;
+        }
+
+        h48full = (uint8_t *)fulltable + INFOSIZE;
+        h48derive = (uint8_t *)arg.h48buf + INFOSIZE;
+        memset(h48derive, 0xFF, H48_TABLESIZE(h, arg.k));
+        memset(arg.info.distribution, 0,
+            INFO_DISTRIBUTION_LEN * sizeof(uint64_t));
+
+        h48max = H48_COORDMAX(11);
+        for (i = 0; i < h48max; i++) {
+                if (i % INT64_C(1000000000) == 0)
+                        LOG("Processing %" PRId64 "th coordinate\n", i);
+                j = i >> (int64_t)(11-h);
+                val_full = get_h48_pval(h48full, i, arg.k);
+                val_derive = get_h48_pval(h48derive, j, arg.k);
+                val_new = MIN(val_full, val_derive);
+                set_h48_pval(h48derive, j, arg.k, val_new);
+        }
+
+        h48max = H48_COORDMAX(h);
+        for (i = 0; i < h48max; i++) {
+                val_derive = get_h48_pval(h48derive, i, arg.k);
+                arg.info.distribution[val_derive]++;
+        }
+
+        if (!writetableinfo(&arg.info, buf)) {
+                LOG("gendata_h48_derive: could not write info for table\n");
+                goto gendata_h48_derive_error;
+        }
+
+gendata_h48_derive_return_size:
+        return cocsepsize + h48size;
+
+gendata_h48_derive_error:
+        return 0;
+}
diff --git a/tools/1002_derive_h48h0k2/derive_h48h0k2.c b/tools/1002_derive_h48h0k2/derive_h48h0k2.c
new file mode 100644
index 0000000..73fab2e
--- /dev/null
+++ b/tools/1002_derive_h48h0k2/derive_h48h0k2.c
@@ -0,0 +1,21 @@
+#include "../tool.h"
+
+uint64_t expected[21] = {
+        /* Base value is 8 */
+        [0] = 5473562,
+        [1] = 34776317,
+        [2] = 68566704,
+        [3] = 8750867,
+};
+
+void run(void) {
+        derivedata_run(0, "tables/h48h0k2_derived", expected);
+}
+
+int main(void) {
+        nissy_setlogger(log_stderr);
+
+        timerun(run, "benchmark derivedata_h48 h = 0, k = 2");
+
+        return 0;
+}
diff --git a/tools/nissy_extra.h b/tools/nissy_extra.h
new file mode 100644
index 0000000..4294c24
--- /dev/null
+++ b/tools/nissy_extra.h
@@ -0,0 +1,6 @@
+/*
+This header file exposes certain functions that are meant to be used
+for testing purposes only.
+*/
+
+size_t gendata_h48_derive(uint8_t, const void *, void *);
diff --git a/tools/tool.h b/tools/tool.h
index 757657b..59407b6 100644
--- a/tools/tool.h
+++ b/tools/tool.h
@@ -6,14 +6,17 @@
 #include <stdlib.h>
 
 #include "../src/nissy.h"
+#include "nissy_extra.h"
 
 static void log_stderr(const char *, ...);
 static void log_stdout(const char *, ...);
 static double timerun(void (*)(void), const char *);
 static void writetable(const char *, int64_t, const char *);
 static int64_t generatetable(const char *, const char *, char **);
+static int64_t derivetable(uint8_t, char **);
 static int getdata(const char *, const char *, char **, const char *);
 static void gendata_run(const char *, const char *, const char *, uint64_t[static 21]);
+static void derivedata_run(uint8_t, const char *, uint64_t[static 21]);
 
 static void
 log_stderr(const char *str, ...)
@@ -109,6 +112,41 @@ generatetable(const char *solver, const char *options, char **buf)
         return gensize;
 }
 
+static int64_t
+derivetable(uint8_t h, char **buf)
+{
+        int64_t size, gensize;
+        char *fulltable;
+
+        char options[20] = " ;2;20"; /* Fixed for k = 2 for now */
+        options[0] = (char)(h + '0'); /* h = 10 not supported for now */
+
+        /* Support only b8 for now */
+        if (getdata("h48", "11;2;20", &fulltable, "tables/h48h11k2_b8") != 0) {
+                printf("Error reading full table.\n");
+                return -1;
+        }
+
+        size = nissy_datasize("h48", options);
+        if (size == -1) {
+                printf("Error getting table size.\n");
+                free(fulltable);
+                return -1;
+        }
+
+        *buf = malloc(size);
+        gensize = gendata_h48_derive(h, fulltable, *buf);
+
+        if (gensize != size) {
+                fprintf(stderr, "Error deriving table\n");
+                free(fulltable);
+                return -2;
+        }
+
+        free(fulltable);
+        return gensize;
+}
+
 static int
 getdata(
         const char *solver,
@@ -182,3 +220,29 @@ gendata_run(
 gendata_run_finish:
         free(buf);
 }
+
+static void
+derivedata_run(uint8_t h, const char *filename, uint64_t expected[static 21])
+{
+        int64_t size;
+        char *buf;
+
+        size = derivetable(h, &buf);
+        switch (size) {
+        case -1:
+                return;
+        case -2:
+                goto derivedata_run_finish;
+        default:
+                nissy_datainfo(buf, write_stdout);
+                printf("\n");
+                printf("Succesfully generated %" PRId64 " bytes. "
+                       "See above for details on the tables.\n", size);
+
+                writetable(buf, size, filename);
+                break;
+        }
+
+derivedata_run_finish:
+        free(buf);
+}