From ff7fc5dabef6931e7d23ee0613aa60e1d09dfbb0 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sun, 6 May 2007 00:35:24 +0000
Subject: implement the 'string constant' optimization.  This shrinks kc.bit
 from 2878544 to 2815788

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36818 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Bitcode/Writer/BitcodeWriter.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'lib/Bitcode/Writer/BitcodeWriter.cpp')

diff --git a/lib/Bitcode/Writer/BitcodeWriter.cpp b/lib/Bitcode/Writer/BitcodeWriter.cpp
index 7198bc0060..a29f23ddfc 100644
--- a/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -484,6 +484,12 @@ static void WriteConstants(unsigned FirstVal, unsigned LastVal,
         assert (CFP->getType() == Type::DoubleTy && "Unknown FP type!");
         Record.push_back(DoubleToBits((double)CFP->getValue()));
       }
+    } else if (isa<ConstantArray>(C) && cast<ConstantArray>(C)->isString()) {
+      // Emit constant strings specially.
+      Code = bitc::CST_CODE_STRING;
+      for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
+        Record.push_back(cast<ConstantInt>(C->getOperand(i))->getZExtValue());
+      
     } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(V) ||
                isa<ConstantVector>(V)) {
       Code = bitc::CST_CODE_AGGREGATE;
-- 
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