From 7cbd2996964abf782dd4bdfe9b582fd7c8af36b2 Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Sat, 20 Jan 2024 21:15:28 +0200
Subject: [PATCH] lightrec: implement clock cache clear on cycle_multiplier
 change

libretro/pcsx_rearmed#818
---
 Makefile                         |  3 ++-
 libpcsxcore/lightrec/internals.c | 16 ++++++++++++++++
 libpcsxcore/lightrec/internals.h |  2 ++
 libpcsxcore/lightrec/plugin.c    | 15 ++++++++++++---
 4 files changed, 32 insertions(+), 4 deletions(-)
 create mode 100644 libpcsxcore/lightrec/internals.c
 create mode 100644 libpcsxcore/lightrec/internals.h

diff --git a/Makefile b/Makefile
index 4786a922..bb183a42 100644
--- a/Makefile
+++ b/Makefile
@@ -119,7 +119,8 @@ OBJS += deps/lightrec/recompiler.o \
 	deps/lightrec/reaper.o
 endif
 OBJS += deps/lightrec/tlsf/tlsf.o
-OBJS += libpcsxcore/lightrec/plugin.o
+OBJS += libpcsxcore/lightrec/plugin.o \
+	libpcsxcore/lightrec/internals.o
 OBJS += deps/lightning/lib/jit_disasm.o \
 		deps/lightning/lib/jit_memory.o \
 		deps/lightning/lib/jit_names.o \
diff --git a/libpcsxcore/lightrec/internals.c b/libpcsxcore/lightrec/internals.c
new file mode 100644
index 00000000..e37d5905
--- /dev/null
+++ b/libpcsxcore/lightrec/internals.c
@@ -0,0 +1,16 @@
+// internals: stuff lightrec's public API doesn't provide
+#include <assert.h>
+#include "lightrec-private.h"
+#include "blockcache.h"
+#include "internals.h"
+
+void lightrec_plugin_clear_block_caches(struct lightrec_state *state)
+{
+	if (state == NULL)
+		return;
+
+	lightrec_invalidate_all(state);
+	lightrec_free_block_cache(state->block_cache);
+	state->block_cache = lightrec_blockcache_init(state);
+	assert(state->block_cache);
+}
diff --git a/libpcsxcore/lightrec/internals.h b/libpcsxcore/lightrec/internals.h
new file mode 100644
index 00000000..27480168
--- /dev/null
+++ b/libpcsxcore/lightrec/internals.h
@@ -0,0 +1,2 @@
+struct lightrec_state;
+void lightrec_plugin_clear_block_caches(struct lightrec_state *state);
diff --git a/libpcsxcore/lightrec/plugin.c b/libpcsxcore/lightrec/plugin.c
index 27fdc476..0b8e618b 100644
--- a/libpcsxcore/lightrec/plugin.c
+++ b/libpcsxcore/lightrec/plugin.c
@@ -1,4 +1,3 @@
-#include <lightrec.h>
 #include <errno.h>
 #include <stdbool.h>
 #include <stdio.h>
@@ -10,6 +9,8 @@
 #include <sys/mman.h>
 #endif
 
+#include "lightrec.h"
+#include "internals.h"
 #include "../cdrom.h"
 #include "../gpu.h"
 #include "../gte.h"
@@ -601,11 +602,19 @@ static void lightrec_plugin_notify(enum R3000Anote note, void *data)
 
 static void lightrec_plugin_apply_config()
 {
+	static u32 cycles_per_op_old;
 	u32 cycle_mult = Config.cycle_multiplier_override && Config.cycle_multiplier == CYCLE_MULT_DEFAULT
 		? Config.cycle_multiplier_override : Config.cycle_multiplier;
-	assert(cycle_mult);
+	u32 cycles_per_op = cycle_mult * 1024 / 100;
+	assert(cycles_per_op);
 
-	lightrec_set_cycles_per_opcode(lightrec_state, cycle_mult * 1024 / 100);
+	if (cycles_per_op_old && cycles_per_op_old != cycles_per_op) {
+		SysPrintf("lightrec: reinit block cache for cycles_per_op %.2f\n",
+			cycles_per_op / 1024.f);
+		lightrec_plugin_clear_block_caches(lightrec_state);
+	}
+	cycles_per_op_old = cycles_per_op;
+	lightrec_set_cycles_per_opcode(lightrec_state, cycles_per_op);
 }
 
 static void lightrec_plugin_shutdown(void)
-- 
2.39.2