From c7363f1147f8d06c34683480b0cb7e24a395a534 Mon Sep 17 00:00:00 2001
From: "Duncan P. N. Exon Smith" <dexonsmith@apple.com>
Date: Fri, 13 Feb 2015 01:10:38 +0000
Subject: AsmWriter/Bitcode: MDSubrange

llvm-svn: 229003
---
 llvm/lib/Bitcode/Writer/BitcodeWriter.cpp | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

(limited to 'llvm/lib/Bitcode/Writer')

diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
index 1c2424ce11b..3d1e82d8f8c 100644
--- a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -809,11 +809,23 @@ static void WriteGenericDebugNode(const GenericDebugNode *N,
   Record.clear();
 }
 
-static void WriteMDSubrange(const MDSubrange *, const ValueEnumerator &,
-                            BitstreamWriter &, SmallVectorImpl<uint64_t> &,
-                            unsigned) {
-  llvm_unreachable("write not implemented");
+static uint64_t rotateSign(int64_t I) {
+  uint64_t U = I;
+  return I < 0 ? ~(U << 1) : U << 1;
+}
+
+static void WriteMDSubrange(const MDSubrange *N, const ValueEnumerator &,
+                            BitstreamWriter &Stream,
+                            SmallVectorImpl<uint64_t> &Record,
+                            unsigned Abbrev) {
+  Record.push_back(N->isDistinct());
+  Record.push_back(N->getCount());
+  Record.push_back(rotateSign(N->getLo()));
+
+  Stream.EmitRecord(bitc::METADATA_SUBRANGE, Record, Abbrev);
+  Record.clear();
 }
+
 static void WriteMDEnumerator(const MDEnumerator *, const ValueEnumerator &,
                               BitstreamWriter &, SmallVectorImpl<uint64_t> &,
                               unsigned) {
-- 
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