From af3d0ad1926eb825f64152cf217fc9a4777f0be3 Mon Sep 17 00:00:00 2001
From: Stefan Weigl-Bosker <stefan@s00.xyz>
Date: Thu, 19 Feb 2026 18:45:44 -0500
Subject: [willow]: more cleanup, tests

---
 willow/lib/IR/Constant.cpp | 53 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 willow/lib/IR/Constant.cpp

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

diff --git a/willow/lib/IR/Constant.cpp b/willow/lib/IR/Constant.cpp
new file mode 100644
index 0000000..b9c15c7
--- /dev/null
+++ b/willow/lib/IR/Constant.cpp
@@ -0,0 +1,53 @@
+#include <willow/IR/Constant.h>
+#include <utility>
+#include <cassert>
+#include <ostream>
+
+namespace willow {
+
+ConstantInt::ConstantInt(Type ty, uint64_t val)
+    : Constant(ty, ConstantKind::Int) {
+  const size_t w = ty.getNumBits();
+  assert(w <= 64 && "Come back when im less lazy");
+  // assert(!(val >> w) && "Truncated constant");
+
+  if (w == 64)
+    bits = val;
+  else {
+    const uint64_t m = (uint64_t{1} << w) - 1;
+    bits = val & m;
+  }
+}
+
+int64_t ConstantInt::getSExtVal() const {
+  const size_t w = getType().getNumBits();
+
+  if (w == 64)
+    return static_cast<int64_t>(bits);
+
+  unsigned sh = 64 - w;
+  return (static_cast<int64_t>(bits << sh)) >> sh;
+}
+
+size_t ConstantInt::Hash::operator()(const ConstantInt::Key &k) const noexcept {
+  auto h1 = std::hash<TypeImpl *>{}(k.ty);
+  auto h2 = std::hash<uint64_t>{}(k.bits);
+
+  return h1 ^ (h2 + 0x9e3779b97f4a7c15ULL + (h1 << 6) + (h1 >> 2));
+}
+
+} // namespace willow
+
+// TODO
+std::ostream &operator<<(std::ostream &os, const willow::Constant &c) {
+  if (c.isPoison())
+    return os << "poison";
+
+  if (c.isInt()) {
+    return os << static_cast<const willow::ConstantInt *>(&c)->getSExtVal();
+  }
+
+  std::unreachable();
+
+  return os;
+}
-- 
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