commit 34d512ec1e5d8fb8cf4cb72734c82a31988f5c8a
author Simon Pilgrim <llvm-dev@redking.me.uk> Sat Mar 24 21:04:20 2018 +0000
committer Simon Pilgrim <llvm-dev@redking.me.uk> Sat Mar 24 21:04:20 2018 +0000
tree edbb08b60db3b0a5b7a8d7eff7ef19e1a5c9140f
parent 31a96337249054680d6bff0d27f17417e1ddb3d3

[SchedModel] Avoid std::string creation for instregex patterns that don't contain regex metas. NFCI.

llvm-svn: 328436

llvm/utils/TableGen/CodeGenSchedule.cpp

diff --git a/llvm/utils/TableGen/CodeGenSchedule.cpp b/llvm/utils/TableGen/CodeGenSchedule.cpp
index 1b516c1..b73e076 100644
--- a/llvm/utils/TableGen/CodeGenSchedule.cpp
+++ b/llvm/utils/TableGen/CodeGenSchedule.cpp
@@ -95,9 +95,10 @@
 
       Optional<Regex> Regexpr = None;
       StringRef Prefix = Original.substr(0, FirstMeta);
-      std::string pat = Original.substr(FirstMeta);
-      if (!pat.empty()) {
+      StringRef PatStr = Original.substr(FirstMeta);
+      if (!PatStr.empty()) {
         // For the rest use a python-style prefix match.
+        std::string pat = PatStr;
         if (pat[0] != '^') {
           pat.insert(0, "^(");
           pat.insert(pat.end(), ')');