From 81c59c79125825989bd8d1f8a706681368b1c94d Mon Sep 17 00:00:00 2001
From: Ben Vanik <ben.vanik@gmail.com>
Date: Sun, 5 Jan 2014 02:24:16 -0800
Subject: [PATCH] Sign extend constant handling.

---
 src/alloy/hir/value.cc | 37 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/src/alloy/hir/value.cc b/src/alloy/hir/value.cc
index cd8935842..156768903 100644
--- a/src/alloy/hir/value.cc
+++ b/src/alloy/hir/value.cc
@@ -78,7 +78,42 @@ void Value::ZeroExtend(TypeName target_type) {
 }
   
 void Value::SignExtend(TypeName target_type) {
-  // TODO(benvanik): big matrix.
+  switch (type) {
+  case INT8_TYPE:
+    type = target_type;
+    switch (target_type) {
+    case INT16_TYPE:
+      constant.i16 = constant.i8;
+      break;
+    case INT32_TYPE:
+      constant.i32 = constant.i8;
+      break;
+    case INT64_TYPE:
+      constant.i64 = constant.i8;
+      break;
+    }
+    return;
+  case INT16_TYPE:
+    type = target_type;
+    switch (target_type) {
+    case INT32_TYPE:
+      constant.i32 = constant.i16;
+      break;
+    case INT64_TYPE:
+      constant.i64 = constant.i16;
+      break;
+    }
+    return;
+  case INT32_TYPE:
+    type = target_type;
+    switch (target_type) {
+    case INT64_TYPE:
+      constant.i64 = constant.i32;
+      break;
+    }
+    return;
+  }
+  // Unsupported types.
   XEASSERTALWAYS();
 }