From 92fc41226f784b251f41eab7e75c13075e980a54 Mon Sep 17 00:00:00 2001
From: Scott Gasch <scott@gasch.org>
Date: Fri, 4 Sep 2026 16:46:27 -0700
Subject: Land bitboard move generation (Part A+B) and movesup.c bitboard
 queries; default on

Implements the full board_representation/MOVEGEN_MIGRATION.md scope:
bitboard-backed generators for all six not-in-check piece types plus
the JumpTable-avoiding whole-node dispatch fork (_GenerateAllMovesBB),
the in-check escape path (king flight + block/capture), and
movesup.c's ExposesCheck/FasterExposesCheck/ExposesCheckEp/IsAttacked/
InCheck bitboard equivalents. Nine toggles total
(GENERATE_{KNIGHT,KING,ROOK,BISHOP,QUEEN,PAWN}_BITBOARD,
GENERATE_ESCAPES_{KING,BLOCK}_BITBOARD, EXPOSESCHECK_BITBOARD,
ISATTACKED_BITBOARD), all now on by default in GNUmakefile --
DISABLE_BITBOARD_MOVEGEN=1 opts back into the mailbox path, which
remains fully present and compiled either way.

Correctness verified via perft (Kiwipete, Position 4), the move-set
comparison harness across 20,000 random positions, all nine toggles
combined cleanly (15/15 runs, after fixing a GenerateRandomLegalPosition
en-passant-sentinel bug in the test harness), and sd10 on all three
curated suites showing zero solve-count regression vs head_reference
(the ecm_hard_quick delta traced to unrelated intervening commits).
Speed: most individual generators land near parity by design (mailbox's
per-square walk was already close to O(destination count)); the real,
consistent wins are the dispatch-layer fork (up to 23% in dense
positions) and IsAttackedBB (0.73x-0.93x of mailbox).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AbHkVrm5KUyzLwWd3GHmo6
---
 src/main.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

(limited to 'src/main.c')

diff --git a/src/main.c b/src/main.c
index 9abc407..d697532 100755
--- a/src/main.c
+++ b/src/main.c
@@ -451,7 +451,11 @@ Return value:
 
 **/
 {
-    srand((unsigned int)time(0));
+    {
+        unsigned int uSeed = (unsigned int)time(0);
+        Trace("srand seed: %u\n", uSeed);
+        srand(uSeed);
+    }
     InitializeOptions(argc, argv);
     InitializeTreeDump();
     InitializeEGTB();
@@ -464,7 +468,9 @@ Return value:
     InitializeRookRayTables();
     InitializeBishopRayTables();
     InitializeKnightAttackTables();
+    InitializeKingAttackTables();
     InitializePawnAttackOriginTable();
+    InitMagic();
     InitializeOpeningBook();
     InitializeDynamicMoveOrdering();
     InitLMRTable();
@@ -588,8 +594,15 @@ Return value:
     TestSan();
     TestIcs();
     TestGetAttacks();
+    TestIsAttackedBB();
     TestMoveGenerator();
     TestLegalMoveGenerator();
+    TestGenerateKnightSpeed();
+    TestGenerateKingSpeed();
+    TestGenerateRookSpeed();
+    TestGenerateBishopSpeed();
+    TestGenerateQueenSpeed();
+    TestGenerateAllMovesSpeed();
     TestFenCode();
     TestLiftPlaceSlidePiece();
     TestExposesCheck();
-- 
cgit v1.3