ecmult_gen: Tidy precomputed file and save space

bitcoin-core · Dec 9, 2021 · 6573c08 · 6573c08
1 parent 5eba83f
commit 6573c08
Showing 1 changed file with 14 additions and 7 deletions.
diff --git a/src/gen_ecmult_gen_static_prec_table.c b/src/gen_ecmult_gen_static_prec_table.c
@@ -4,6 +4,9 @@
  * file COPYING or https://www.opensource.org/licenses/mit-license.php.*
  ***********************************************************************/
 
+#include <inttypes.h>
+#include <stdio.h>
+
 /* In principle we could use ASM, but this yields only a minor speedup in
    build time and it's very complicated. In particular when cross-compiling, we'd
    need to build the ASM for the build and the host machine. */
@@ -31,12 +34,16 @@ int main(int argc, char **argv) {
         return -1;
     }
 
+    fprintf(fp, "/* This file was automatically generated by gen_ecmult_gen_static_prec_table. */\n");
+    fprintf(fp, "/* See ecmult_gen_impl.h for details about the contents of this file. */\n");
     fprintf(fp, "#ifndef SECP256K1_ECMULT_GEN_STATIC_PREC_TABLE_H\n");
     fprintf(fp, "#define SECP256K1_ECMULT_GEN_STATIC_PREC_TABLE_H\n");
 
-    fprintf(fp, "#include \"src/group.h\"\n");
+    fprintf(fp, "#include \"group.h\"\n");
 
-    fprintf(fp, "#define SC SECP256K1_GE_STORAGE_CONST\n");
+    fprintf(fp, "#define S(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) "
+            "SECP256K1_GE_STORAGE_CONST(0x##a##u,0x##b##u,0x##c##u,0x##d##u,0x##e##u,0x##f##u,0x##g##u,"
+            "0x##h##u,0x##i##u,0x##j##u,0x##k##u,0x##l##u,0x##m##u,0x##n##u,0x##o##u,0x##p##u)\n");
 
     fprintf(fp, "#ifdef EXHAUSTIVE_TEST_ORDER\n");
     fprintf(fp, "static secp256k1_ge_storage secp256k1_ecmult_gen_prec_table[ECMULT_GEN_PREC_N(ECMULT_GEN_PREC_BITS)][ECMULT_GEN_PREC_G(ECMULT_GEN_PREC_BITS)];\n");
@@ -53,14 +60,14 @@ int main(int argc, char **argv) {
 
         fprintf(fp, "#if ECMULT_GEN_PREC_BITS == %d\n", bits);
         for(outer = 0; outer != n; outer++) {
-            fprintf(fp,"{\n");
+            fprintf(fp,"{");
             for(inner = 0; inner != g; inner++) {
-                fprintf(fp,"    SC(%uu, %uu, %uu, %uu, %uu, %uu, %uu, %uu, %uu, %uu, %uu, %uu, %uu, %uu, %uu, %uu)", SECP256K1_GE_STORAGE_CONST_GET(table[outer * g + inner]));
+                fprintf(fp, "S(%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32
+                            ",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32")",
+                        SECP256K1_GE_STORAGE_CONST_GET(table[outer * g + inner]));
                 if (inner != g - 1) {
                     fprintf(fp,",\n");
-                } else {
-                    fprintf(fp,"\n");
-                }
+                } 
             }
             if (outer != n - 1) {
                 fprintf(fp,"},\n");