comment move_find_in_movelist() limitations

.gitignore

@@ -20,3 +20,4 @@ perf.data
 valgrind.out
 gmon.out
 compile_commands.json
+.lastbuild

Makefile

@@ -12,16 +12,6 @@
 
 SHELL     := /bin/bash
 
-ifeq ($(CC),)
-        CC = gcc
-endif
-ifeq ($(CC),cc)
-        CC = gcc
-endif
-ifeq ($(BUILD),)
-        BUILD = dev
-endif
-
 BEAR      := bear
 TOUCH     := touch
 RM        := rm
@@ -60,6 +50,38 @@ TARGET    := $(addprefix $(BINDIR)/,$(TARGET_FN))
 ASMFILES  := $(SRC:.c=.s) $(TSTSRC:.c=.s)
 CPPFILES  := $(SRC:.c=.i) $(TSTSRC:.c=.i)
 
+##################################### Check for compiler and requested build
+BUILDS    := release dev perf debug
+# last compilation build
+BUILDFILE := .lastbuild
+lastbuild := $(file < $(BUILDFILE))
+$(info last:$(lastbuild))
+# default to gcc
+CC        ?= cc
+ifeq ($(CC),cc)
+        CC = gcc
+endif
+
+# if no build specified, use last one
+ifeq ($(build),)
+        build := $(lastbuild)
+endif
+# if build is still undefined, set a default
+ifeq ($(build),)
+        build := release
+endif
+
+# check for valid build
+ifeq ($(filter $(build),$(BUILDS)),)
+        $(error Error: Unknown build=`$(build)`. Possible builds are: $(BUILDS))
+endif
+
+# if new build, rewrite BUILDFILE
+ifneq ($(build),$(lastbuild))
+        $(info New build:`$(build)` (was:$(lastbuild)))
+        $(file >$(BUILDFILE),$(build))
+endif
+
 ##################################### set a version string
 # inspired from:
 #  https://eugene-babichenko.github.io/blog/2019/09/28/nightly-versions-makefiles/
@@ -90,11 +112,13 @@ endif
 ##################################### pre-processor flags
 CPPFLAGS  := -I$(BRINCDIR) -I$(INCDIR) -DVERSION=\"$(VERSION)\"
 
+CPPFLAGS  += -DDIAGRAM_SYM                                  # UTF8 symbols in diagrams
+
 ifeq ($(BUILD),release)
         CPPFLAGS  += -DNDEBUG                               # assert (unused)
 else # ifeq ($(BUILD),dev)
-        CPPFLAGS  += -DWARN_ON                              # brlib bug.h
-        CPPFLAGS  += -DBUG_ON                               # brlib bug.h
+        CPPFLAGS  += -DWARN_ON=1                            # brlib bug.h
+        CPPFLAGS  += -DBUG_ON=1                             # brlib bug.h
 
         #CPPFLAGS  += -DDEBUG                               # global - unused
         #CPPFLAGS  += -DDEBUG_DEBUG                         # enable log() functions
@@ -115,8 +139,6 @@ else # ifeq ($(BUILD),dev)
         #CPPFLAGS  += -DDEBUG_SEARCH                        # move search
 endif
 
-CPPFLAGS  += -DDIAGRAM_SYM                                  # UTF8 symbols in diagrams
-
 # remove extraneous spaces (due to spaces before comments)
 CPPFLAGS  := $(strip $(CPPFLAGS))
 
@@ -132,8 +154,8 @@ CFLAGS    += -march=native
 ### dev OR release
 ifeq ($(BUILD),release)
         CFLAGS    += -O3
-        CFLAGS    += -g
-        CFLAGS    += -ginline-points                   # inlined funcs debug info
+        #CFLAGS    += -g
+        #CFLAGS    += -ginline-points                   # inlined funcs debug info
         CFLAGS    += -funroll-loops
         CFLAGS    += -flto
 else ifeq ($(BUILD),dev)
@@ -210,9 +232,9 @@ $(sort all $(MAKECMDGOALS)):
 else
 
 ##################################### General targets
-.PHONY: all release dev perf debug compile clean cleanall
+.PHONY: all release dev perf debug compile libs clean cleanall
 
-all: testing $(TARGET)
+all: libs testing $(TARGET)
 
 release:
 	$(MAKE) BUILD=release clean all
@@ -314,7 +336,7 @@ cleanobjdir: cleanobj
 # "normal" ones, but do not imply to rebuild target.
 $(OBJDIR)/%.o: $(SRCDIR)/%.c | $(OBJDIR) $(DEPDIR)
 	@echo compiling brchess module: $< "->" $@.
-	@$(CC) -c $(ALL_CFLAGS) $< -o $@
+	$(CC) -c $(ALL_CFLAGS) $< -o $@
 
 ##################################### brlib libraries
 .PHONY: cleanbrlib cleanallbrlib brlib
@@ -325,8 +347,10 @@ cleanbrlib:
 cleanallbrlib:
 	$(MAKE) -C $(BRLIB) cleanall
 
+export build
 brlib:
-	$(MAKE) -C $(BRLIB) libs
+	$(info calling with build=$(build))
+	$(MAKE) -e -C $(BRLIB) lib-static
 
 ##################################### brchess binaries
 .PHONY: targets cleanbin cleanbindir
@@ -398,7 +422,7 @@ TEST          += movedo-test perft-test tt-test
 
 PIECE_OBJS    := piece.o
 FEN_OBJS      := $(PIECE_OBJS) fen.o position.o bitboard.o board.o \
-	hq.o attack.o hash.o init.o misc.o move.o
+	hq.o attack.o hash.o init.o misc.o alloc.o move.o
 BB_OBJS       := $(FEN_OBJS)
 MOVEGEN_OBJS  := $(BB_OBJS) move-gen.o
 ATTACK_OBJS   := $(MOVEGEN_OBJS)

src/alloc.c

@@ -0,0 +1,51 @@
+/* alloc.c - various memory allocation helpers
+ *
+ * Copyright (C) 2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <brlib.h>
+
+#include "chessdefs.h"
+#include "alloc.h"
+
+/* force BUG_ON, to get a program abort for failed malloc/free
+ */
+#pragma push_macro("BUG_ON")
+#undef BUG_ON
+#define BUG_ON 1
+#include <bug.h>
+
+void *safe_alloc(size_t size)
+{
+    void *mem = malloc(size);
+    bug_on(mem == NULL);
+    return mem;
+}
+
+void *safe_alloc_page_aligned(size_t size)
+{
+    void *mem = malloc(size);
+    bug_on(mem == NULL);
+    return mem;
+}
+
+void safe_free(void *ptr)
+{
+    bug_on(ptr == NULL);
+    free(ptr);
+}
+
+/* restore BUG_ON
+ */
+#pragma pop_macro("BUG_ON")

src/alloc.h

@@ -0,0 +1,21 @@
+/* alloc.h - various memory allocation helpers
+ *
+ * Copyright (C) 2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "chessdefs.h"
+
+void *safe_alloc(size_t size);
+void *safe_alloc_page_aligned(size_t size);
+void safe_free(void *ptr);

src/bitboard.c

@@ -30,7 +30,7 @@ bitboard_t bb_line[64][64];
 bitboard_t bb_knight[64], bb_king[64], bb_pawn_attacks[2][64];
 
 /*  vectors are clockwise from N */
-static int knight_vector[] = {
+static int knight_vector[8] = {
     NORTH_EAST + NORTH, NORTH_EAST + EAST,
     SOUTH_EAST + EAST,  SOUTH_EAST + SOUTH,
     SOUTH_WEST + SOUTH, SOUTH_WEST + WEST,

src/fen.c

@@ -21,7 +21,7 @@
 #include <bug.h>
 
 #include "chessdefs.h"
-#include "misc.h"
+#include "alloc.h"
 #include "position.h"
 #include "fen.h"
 
@@ -288,7 +288,7 @@ char *pos2fen(const pos_t *pos, char *fen)
     int cur = 0;
 
     if (!fen)
-        fen = safe_malloc(92);
+        fen = safe_alloc(92);
 
     /*  1) position
      */

src/hash.c

@@ -18,7 +18,7 @@
 #include <bitops.h>
 
 #include "chessdefs.h"
-#include "misc.h"
+#include "alloc.h"
 #include "position.h"
 #include "piece.h"
 #include "hash.h"
@@ -211,7 +211,7 @@ int tt_create(s32 sizemb)
 
         hash_tt.mask     = -1ull >> (64 - nbits);
 
-        hash_tt.keys     = safe_malloc(hash_tt.bytes);
+        hash_tt.keys     = safe_alloc(hash_tt.bytes);
 
         //printf("bits=%2d size=%'15lu/%'6d Mb/%'14lu buckets ",
         //       hash_tt.nbits, hash_tt.bytes, hash_tt.mb, hash_tt.nbuckets);

src/hq.c

@@ -56,7 +56,6 @@ void hq_init()
     for (int occ = 0; occ < 64; ++occ) {
         for (int file = 0; file < 8; ++file) {
             int attacks = 0;
-            //int o = mask << 1;                    /* skip right square */
 
             /* set f left attacks */
             for (int slide = file - 1; slide >= 0; --slide) {
@@ -70,17 +69,9 @@ void hq_init()
                 int b = bb_sq[slide];
                 attacks |= b;
                 if ((occ << 1) & b)               /* piece on b, we stop */
-                    //if ((o & b) == b)
                     break;
             }
             bb_rank_attacks[(occ << 3) + file] = attacks;
-
-            //if (((occ << 3) + file) == 171) {
-            //char str[64], str2[64];
-               //printf("mask=%x=%s file=%d att=%x=%s\n",
-               //       occ, bitboard_rank_sprint(str, occ), file,
-               //       attacks, bitboard_rank_sprint(str2, attacks));
-            //}
         }
     }
 }
@@ -100,12 +91,6 @@ bitboard_t hq_rank_moves(bitboard_t occ, square_t sq)
     u32 rank = sq & SQ_RANKMASK;
     u32 file = sq & SQ_FILEMASK;
     u64 o = (occ >> rank) & 0176;                 /* 01111110 clear bits 0 & 7 */
-    //char zob[128], zob2[128];
-    //printf("rank_moves: occ=%lx=%s file=%d o=%lx=%s index=%ld=%ld attack=%lx=%s\n", occ,
-    //       bitboard_rank_sprint(zob, occ), file, o,
-    //       bitboard_rank_sprint(zob, o), (o << 2) + file, (o * 4) + file,
-    //       (bitboard_t)bb_rank_attacks[(o << 2) + file] << rank,
-    //       bitboard_rank_sprint(zob2, (bitboard_t)bb_rank_attacks[(o << 2) + file] << rank));
     return ((bitboard_t)bb_rank_attacks[(o << 2) + file]) << rank;
 }
 

src/misc.h

@@ -14,34 +14,5 @@
 #ifndef _UTIL_H
 #define _UTIL_H
 
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "chessdefs.h"
-
-#undef safe_malloc
-#undef safe_free
-
-/* force BUG_ON, to get a program abort for failed malloc/free
- */
-#pragma push_macro("BUG_ON")
-#undef BUG_ON
-#define BUG_ON
-#include <bug.h>
-
-#define safe_malloc(size) ({                   \
-            void *_ret = malloc(size);         \
-            bug_on(_ret == NULL);              \
-            _ret;                              \
-        })
-
-#define safe_free(ptr) do {                    \
-        bug_on(ptr == NULL);                   \
-        free(ptr);                             \
-    } while (0)
-
-/* restore BUG_ON
- */
-#pragma pop_macro("BUG_ON")
 
 #endif  /* UTIL_H */

src/move.c

@@ -165,8 +165,13 @@ move_t move_find_in_movelist(move_t target, movelist_t *list)
     move_t *move = list->move, *last = move + list->nmoves;
 
     for (; move < last; ++move) {
-        if (move_from(target) == move_from(*move) &&
-            move_to(target)   == move_to(*move) &&
+        /* note that we compare promoted piece without checking if the move
+         * is a promotion. But, in our move representation "promoted Knight"
+         * is encoded as zero, same as when there is no promotion. This can
+         * lead to false match is @target or some @list moves are invalid,
+         * which we do not consider.
+         */
+        if (move_fromto(target)   == move_fromto(*move) &&
             move_promoted(target) == move_promoted(*move))
             return *move;
     }
@@ -205,12 +210,13 @@ static int _moves_cmp_bysquare(const void *p1, const void *p2)
     square_t t2 = move_to(m2);
     piece_type_t prom1 = move_promoted(m1);
     piece_type_t prom2 = move_promoted(m2);
+    /* We compare origin square first */
     if (f1 < f2) return -1;
     if (f1 > f2) return 1;
-    /* f1 == f2 */
+    /* f1 == f2, we compare destination squares */
     if (t1 < t2) return -1;
     if (t1 > t2) return 1;
-    /* t1 == t2 */
+    /* t1 == t2, we compare promoted piece */
     if (prom1 < prom2) return -1;
     if (prom1 > prom2) return 1;
     return 0;

src/move.h

@@ -76,7 +76,7 @@ static inline square_t move_to(move_t move)
     return (move >> M_OFF_TO) & 077;
 }
 
-static inline square_t move_fromto(move_t move)
+static inline move_t move_fromto(move_t move)
 {
     return move & 07777;
 }

src/position.c

@@ -27,7 +27,7 @@
 #include "hq.h"
 #include "fen.h"
 #include "piece.h"
-#include "misc.h"
+#include "alloc.h"
 #include "board.h"
 #include "attack.h"
 #include "hist.h"
@@ -42,7 +42,7 @@
  */
 pos_t *pos_new(void)
 {
-    return safe_malloc(sizeof(pos_t));
+    return safe_alloc(sizeof(pos_t));
 }
 
 /**
@@ -57,7 +57,7 @@ pos_t *pos_new(void)
  */
 pos_t *pos_dup(const pos_t *pos)
 {
-    pos_t *newpos = safe_malloc(sizeof(pos_t));
+    pos_t *newpos = safe_alloc(sizeof(pos_t));
 
     *newpos = *pos;
     return newpos;