2 files changed, 19 insertions, 0 deletions
diff --git a/chapter21/src/test/java/com/seaofnodes/simple/Chapter21Test.java b/chapter21/src/test/java/com/seaofnodes/simple/Chapter21Test.java
index 0610d294..e584f9bc 100644
--- a/chapter21/src/test/java/com/seaofnodes/simple/Chapter21Test.java
+++ b/chapter21/src/test/java/com/seaofnodes/simple/Chapter21Test.java
@@ -64,6 +64,14 @@ public class Chapter21Test {
         testCPU(src,"arm"      , "SystemV",19,null);
     }
 
+    @Test
+    public void testAntiDeps1() throws IOException {
+        String src = Files.readString(Path.of("src/test/java/com/seaofnodes/simple/progs/antiDep1.smp"));
+        testCPU(src,"x86_64_v2", "SystemV", 3,"return mov(mov(S));");
+        testCPU(src,"riscv"    , "SystemV",10,"return mov(mov(S));");
+        testCPU(src,"arm"      , "SystemV",10,"return mov(mov(S));");
+    }
+
     @Test public void testNewtonExport() throws IOException {
         String result = """
 0  0.000000
diff --git a/chapter21/src/test/java/com/seaofnodes/simple/progs/antiDep1.smp b/chapter21/src/test/java/com/seaofnodes/simple/progs/antiDep1.smp
new file mode 100644
index 00000000..b18dfd16
--- /dev/null
+++ b/chapter21/src/test/java/com/seaofnodes/simple/progs/antiDep1.smp
@@ -0,0 +1,11 @@
+// -*- mode: java;  -*-
+struct S { int f; };
+var v0 = new S;
+S? v1;
+if (arg) v1 = new S;
+if (v1) {
+    v0.f = v1.f;
+} else {
+    v0.f = 2;
+}
+return v0;