From db613d38f07da20385709b8250d1a3e83b96337d Mon Sep 17 00:00:00 2001
From: Andrew Kelley <superjoe30@gmail.com>
Date: Fri, 25 Aug 2017 20:05:10 -0400
Subject: [PATCH] implement comptime bitcasting from array

---
 src/ir.cpp          | 11 ++++++++++-
 test/cases/cast.zig |  2 +-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/ir.cpp b/src/ir.cpp
index f88612a04..c39950081 100644
--- a/src/ir.cpp
+++ b/src/ir.cpp
@@ -14364,7 +14364,16 @@ static void buf_write_value_bytes(CodeGen *codegen, uint8_t *buf, ConstExprValue
                 zig_unreachable();
             }
         case TypeTableEntryIdArray:
-            zig_panic("TODO buf_write_value_bytes array type");
+            {
+                size_t buf_i = 0;
+                expand_undef_array(codegen, val);
+                for (size_t elem_i = 0; elem_i < val->type->data.array.len; elem_i += 1) {
+                    ConstExprValue *elem = &val->data.x_array.s_none.elements[elem_i];
+                    buf_write_value_bytes(codegen, &buf[buf_i], elem);
+                    buf_i += type_size(codegen, elem->type);
+                }
+            }
+            return;
         case TypeTableEntryIdStruct:
             zig_panic("TODO buf_write_value_bytes struct type");
         case TypeTableEntryIdMaybe:
diff --git a/test/cases/cast.zig b/test/cases/cast.zig
index c805c9b37..8c1df39f6 100644
--- a/test/cases/cast.zig
+++ b/test/cases/cast.zig
@@ -282,5 +282,5 @@ test "const slice widen cast" {
     const u32_value = ([]const u32)(bytes[0..])[0];
     assert(u32_value == 0x12121212);
 
-    //assert(@bitCast(u32, bytes) == 0x12121212);
+    assert(@bitCast(u32, bytes) == 0x12121212);
 }