feat: add benchmarking code

1 files changed, 61 insertions, 0 deletions

diff --git a/benchmark/convert-instructions.ts b/benchmark/convert-instructions.ts
new file mode 100644
index 0000000..7e8e3fd
--- /dev/null
+++ b/benchmark/convert-instructions.ts
@@ -0,0 +1,61 @@
+import * as fs from 'fs';
+import * as prettier from 'prettier';
+
+const input = fs.readFileSync('src/instruction.ts', { encoding: 'utf-8' });
+let fnBody = '';
+let openingBrace = false;
+let currentInstruction = '';
+let pattern = '';
+let output = `
+import { ICPU } from '../src/cpu';
+import { u16 } from '../src/types';
+
+function isTwoWordInstruction(opcode: u16) {
+  return (
+    /* LDS */
+    (opcode & 0xfe0f) === 0x9000 ||
+    /* STS */
+    (opcode & 0xfe0f) === 0x9200 ||
+    /* CALL */
+    (opcode & 0xfe0e) === 0x940e ||
+    /* JMP */
+    (opcode & 0xfe0e) === 0x940c
+  );
+}
+`;
+for (const line of input.split('\n')) {
+  if (line.startsWith('  /* ')) {
+    currentInstruction = line
+      .trim()
+      .split(',')[0]
+      .split(' ')[1];
+    fnBody = '';
+    openingBrace = false;
+    pattern = line.split(',')[1].split('*')[0];
+    console.log(currentInstruction);
+    currentInstruction = currentInstruction.replace(/[\(\)]/g, '');
+  }
+  if (line.startsWith('  }')) {
+    output += `
+      export function inst${currentInstruction}(cpu: ICPU, opcode: number) {
+        /*${pattern}*/
+        ${fnBody}
+        cpu.cycles++;
+        if (++cpu.pc >= cpu.progMem.length) {
+          cpu.pc = 0;
+        }
+      }
+    `;
+    currentInstruction = '';
+  } else if (currentInstruction && openingBrace) {
+    fnBody += line;
+  } else if (currentInstruction && !openingBrace) {
+    openingBrace = line.includes('{');
+  }
+}
+
+const formattedOutput = prettier.format(output, { singleQuote: true, parser: 'babel' });
+
+fs.writeFileSync('benchmark/instruction-fn.ts', formattedOutput, {
+  encoding: 'utf-8'
+});