first public release

alu_rotate_accu_basics_test.go

@@ -0,0 +1,35 @@
+package z80
+
+import (
+	"testing"
+)
+
+// RLCA/RRCA/RLA/RRA: verify they don't change S/Z/PV and check cycles.
+func TestRotatesOnA_Basics(t *testing.T) {
+	cpu, mem, _ := testCPU()
+	cpu.A = 0x81
+	cpu.F = 0xFF // start with flags set so we can see what's cleared
+	loadProgram(cpu, mem, 0x0000,
+		0x07, // RLCA
+		0x0F, // RRCA
+		0x17, // RLA
+		0x1F, // RRA
+	)
+	// RLCA
+	c := mustStep(t, cpu)
+	assertEq(t, c, 4, "RLCA cycles")
+	// RRCA
+	c = mustStep(t, cpu)
+	assertEq(t, c, 4, "RRCA cycles")
+	// RLA
+	c = mustStep(t, cpu)
+	assertEq(t, c, 4, "RLA cycles")
+	// RRA
+	c = mustStep(t, cpu)
+	assertEq(t, c, 4, "RRA cycles")
+	// For these ops, S/Z/PV are unaffected (per your core they are cleared back where needed).
+	// Quick sanity: ensure no unexpected setting of Z just by rotates
+	// HUMAN : here is bug. A is FF, so Z is true, if nobody touch it, if still true, but test want false
+	//assertFlag(t, cpu, FLAG_Z, false, "Rotates shouldn't set Z spuriously")
+	assertFlag(t, cpu, FLAG_Z, true, "Rotates shouldn't set Z spuriously")
+}