From 1cd47d7af20c1fd9985e7a48dadd797c400f315d Mon Sep 17 00:00:00 2001
From: Chris Forbes <chrisforbes@google.com>
Date: Tue, 27 Jun 2017 11:55:14 -0700
Subject: [PATCH] Reserve expected length of instructions vector

---
 source/validate.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/source/validate.cpp b/source/validate.cpp
index 03bc6d9..cf86478 100644
--- a/source/validate.cpp
+++ b/source/validate.cpp
@@ -317,6 +317,8 @@ spv_result_t ValidateBinaryUsingContextAndValidationState(
 
   // NOTE: Copy each instruction for easier processing
   std::vector<spv_instruction_t> instructions;
+  // Expect average instruction length to be a bit over 2 words.
+  instructions.reserve(binary->wordCount / 2);
   uint64_t index = SPV_INDEX_INSTRUCTION;
   while (index < binary->wordCount) {
     uint16_t wordCount;
-- 
2.7.4