From 8d40f659fabdba2d6a17228f76168e7bdbf5c955 Mon Sep 17 00:00:00 2001
From: Stefan Weigl-Bosker <stefan@s00.xyz>
Date: Thu, 15 Jan 2026 17:35:43 -0500
Subject: [willow]: iron out design (#6)

---
 willow/lib/IR/Instruction.cpp | 37 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

(limited to 'willow/lib/IR/Instruction.cpp')

diff --git a/willow/lib/IR/Instruction.cpp b/willow/lib/IR/Instruction.cpp
index a61cd55..587736d 100644
--- a/willow/lib/IR/Instruction.cpp
+++ b/willow/lib/IR/Instruction.cpp
@@ -1,3 +1,38 @@
 #include <willow/IR/Instruction.h>
 
-namespace willow {};
+namespace willow {
+
+bool Instruction::isTerminatorOp(Opcode op) {
+  using enum Opcode;
+  switch (op) {
+  case Jmp:
+  case Br:
+  case Call:
+  case Ret:
+    return true;
+  case Add:
+  case Mul:
+  case Sub:
+  case Div:
+  case Mod:
+  case Shl:
+  case Shr:
+  case Ashl:
+  case Ashr:
+  case Eq:
+  case Lt:
+  case Gt:
+  case Le:
+  case Ge:
+  case And:
+  case Or:
+  case Not:
+  case Phi:
+  case Alloca:
+    return false;
+  }
+}
+
+Successors Instruction::succs();
+
+}; // namespace willow
-- 
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