Fixes #137 Benchmark CPU Module

src/Makefile

@@ -39,10 +39,15 @@ SCR_TEST_SOURCES=cpu.c ins.c mem.c fmt.c two.c scr.c dsk.c chr.c alc.c utl.c scr
 SCR_TEST_OBJECTS=$(SCR_TEST_SOURCES:.c=.o)
 SCR_TEST_LIBS=-lSDL2
 
-all: $(EWM_SOURCES) $(EWM_EXECUTABLE) $(CPU_TEST_SOURCES) $(CPU_TEST_EXECUTABLE) $(SCR_TEST_EXECUTABLE)
+CPU_BENCH=cpu_bench
+CPU_BENCH_SOURCES=cpu.c ins.c mem.c fmt.c cpu_bench.c
+CPU_BENCH_OBJECTS=$(CPU_BENCH_SOURCES:.c=.o)
+CPU_BENCH_LIBS=
+
+all: $(EWM_SOURCES) $(EWM_EXECUTABLE) $(CPU_TEST_SOURCES) $(CPU_TEST_EXECUTABLE) $(SCR_TEST_EXECUTABLE) $(CPU_BENCH)
 
 clean:
-	rm -f $(EWM_OBJECTS) $(EWM_EXECUTABLE) $(CPU_TEST_OBJECTS) $(CPU_TEST_EXECUTABLE) $(SCR_TEST_OBJECTS) $(SCR_TEST_EXECUTABLE)
+	rm -f $(EWM_OBJECTS) $(EWM_EXECUTABLE) $(CPU_TEST_OBJECTS) $(CPU_TEST_EXECUTABLE) $(SCR_TEST_OBJECTS) $(SCR_TEST_EXECUTABLE) $(CPU_BENCH)
 
 $(EWM_EXECUTABLE): $(EWM_OBJECTS)
 	$(CC) $(LDFLAGS) $(EWM_OBJECTS) $(EWM_LIBS) -o $@
@@ -53,5 +58,8 @@ $(CPU_TEST_EXECUTABLE): $(CPU_TEST_OBJECTS)
 $(SCR_TEST_EXECUTABLE): $(SCR_TEST_OBJECTS)
 	$(CC) $(LDFLAGS) $(SCR_TEST_OBJECTS) $(SCR_TEST_LIBS) -o $@
 
+$(CPU_BENCH): $(CPU_BENCH_OBJECTS)
+	$(CC) $(LDFLAGS) $(CPU_BENCH_OBJECTS) $(CPU_BENCH_LIBS) -o $@
+
 .c.o:
 	$(CC) $(CFLAGS) $< -c -o $@

src/cpu.c

@@ -37,12 +37,6 @@
 #include "mem.h"
 #include "fmt.h"
 
-/* Private API */
-
-typedef void (*cpu_instruction_handler_t)(struct cpu_t *cpu);
-typedef void (*cpu_instruction_handler_byte_t)(struct cpu_t *cpu, uint8_t oper);
-typedef void (*cpu_instruction_handler_word_t)(struct cpu_t *cpu, uint16_t oper);
-
 // Stack management.
 
 void _cpu_push_byte(struct cpu_t *cpu, uint8_t b) {

src/cpu.h

@@ -56,6 +56,10 @@ struct cpu_t {
    uint64_t counter;
 };
 
+typedef void (*cpu_instruction_handler_t)(struct cpu_t *cpu);
+typedef void (*cpu_instruction_handler_byte_t)(struct cpu_t *cpu, uint8_t oper);
+typedef void (*cpu_instruction_handler_word_t)(struct cpu_t *cpu, uint16_t oper);
+
 #define MEM_FLAGS_READ  0x01
 #define MEM_FLAGS_WRITE 0x02
 

src/cpu_bench.c

@@ -0,0 +1,88 @@
+// The MIT License (MIT)
+//
+// Copyright (c) 2015 Stefan Arentz - http://github.com/st3fan/ewm
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <time.h>
+
+#include "cpu.h"
+#include "ins.h"
+#include "mem.h"
+
+#define CPU_BENCH_ITERATIONS (100 * 1000 * 1000)
+
+void test(struct cpu_t *cpu, uint8_t opcode) {
+   uint64_t runs[3];
+
+   struct cpu_instruction_t *ins = &cpu->instructions[opcode];
+
+   for (int run = 0; run < 3; run++) {
+      struct timespec start;
+      if (clock_gettime(CLOCK_REALTIME, &start) != 0) {
+         perror("Cannot get time");
+         exit(1);
+      }
+
+      switch (ins->bytes) {
+         case 1:
+            for (uint64_t i = 0; i < CPU_BENCH_ITERATIONS; i++) {
+               ((cpu_instruction_handler_t) ins->handler)(cpu);
+            }
+            break;
+         case 2:
+            for (uint64_t i = 0; i < CPU_BENCH_ITERATIONS; i++) {
+               ((cpu_instruction_handler_byte_t) ins->handler)(cpu, 0x12);
+            }
+            break;
+         case 3:
+            for (uint64_t i = 0; i < CPU_BENCH_ITERATIONS; i++) {
+               ((cpu_instruction_handler_word_t) ins->handler)(cpu, 0x1234);
+            }
+            break;
+      }
+
+      struct timespec now;
+      if (clock_gettime(CLOCK_REALTIME, &now) != 0) {
+         perror("Cannot get time");
+         exit(1);
+      }
+
+      uint64_t duration_ms = (now.tv_sec * 1000 + (now.tv_nsec / 1000000))
+         - (start.tv_sec * 1000 + (start.tv_nsec / 1000000));
+
+      runs[run] = duration_ms;
+   }
+
+   printf("$%.2X %s %8llu %8llu %8llu -> %8llu\n",
+          opcode, ins->name, runs[0], runs[1], runs[2],
+          (runs[0] + runs[1] + runs[2]) / 3);
+}
+
+int main(int argc, char **argv) {
+   struct cpu_t *cpu = cpu_create(EWM_CPU_MODEL_65C02);
+   cpu_add_ram_data(cpu, 0, 0xffff, malloc(0xffff));
+   cpu_reset(cpu);
+
+   for (int opcode = 0; opcode <= 255; opcode++) {
+      test(cpu, opcode);
+   }
+}