Add int-sub instruction

2 files changed, 13 insertions, 0 deletions

diff --git a/src/test/java/org/shedlang/compiler/stackir/InstructionSerializerTests.java b/src/test/java/org/shedlang/compiler/stackir/InstructionSerializerTests.java
index 3f8398cc..c6046847 100644
--- a/src/test/java/org/shedlang/compiler/stackir/InstructionSerializerTests.java
+++ b/src/test/java/org/shedlang/compiler/stackir/InstructionSerializerTests.java
@@ -103,6 +103,15 @@ public class InstructionSerializerTests {
     }
 
     @Test
+    public void canSerializeIntSub() {
+        var instruction = Instructions.intSub();
+
+        var string = serialize(instruction);
+
+        assertThat(string, equalTo("(int-sub)"));
+    }
+
+    @Test
     public void canSerializeLocalLoad() {
         var instruction = Instructions.localLoad("x");
 
diff --git a/src/test/java/org/shedlang/compiler/stackir/instructions/Instructions.java b/src/test/java/org/shedlang/compiler/stackir/instructions/Instructions.java
index 5b155878..6f769591 100644
--- a/src/test/java/org/shedlang/compiler/stackir/instructions/Instructions.java
+++ b/src/test/java/org/shedlang/compiler/stackir/instructions/Instructions.java
@@ -34,6 +34,10 @@ public class Instructions {
         return new IntNotEqualInstruction(Sources.NULL);
     }
 
+    public static Instruction intSub() {
+        return new IntSubInstruction(Sources.NULL);
+    }
+
     public static Instruction localLoad(String name) {
         return new LocalLoadInstruction(name, Sources.NULL);
     }