PR25416: Improve performance of processing inline assembly consisting of many

implicitly-concatenated string literals. When looking for the start of a token
in the inline assembly, start from the end of the previous token, not the start
of the entire string.

Patch by Yunlian Jiang!

llvm-svn: 255198

1 files changed, 5 insertions, 3 deletions

diff --git a/clang/lib/CodeGen/CGStmt.cpp b/clang/lib/CodeGen/CGStmt.cpp
index 1cbdeffd7c4..b0ca80e9414 100644
--- a/clang/lib/CodeGen/CGStmt.cpp
+++ b/clang/lib/CodeGen/CGStmt.cpp
@@ -1714,13 +1714,15 @@ static llvm::MDNode *getAsmSrcLocInfo(const StringLiteral *Str,
   if (!StrVal.empty()) {
     const SourceManager &SM = CGF.CGM.getContext().getSourceManager();
     const LangOptions &LangOpts = CGF.CGM.getLangOpts();
+    unsigned StartToken = 0;
+    unsigned ByteOffset = 0;
 
     // Add the location of the start of each subsequent line of the asm to the
     // MDNode.
-    for (unsigned i = 0, e = StrVal.size()-1; i != e; ++i) {
+    for (unsigned i = 0, e = StrVal.size() - 1; i != e; ++i) {
       if (StrVal[i] != '\n') continue;
-      SourceLocation LineLoc = Str->getLocationOfByte(i+1, SM, LangOpts,
-                                                      CGF.getTarget());
+      SourceLocation LineLoc = Str->getLocationOfByte(
+          i + 1, SM, LangOpts, CGF.getTarget(), &StartToken, &ByteOffset);
       Locs.push_back(llvm::ConstantAsMetadata::get(
           llvm::ConstantInt::get(CGF.Int32Ty, LineLoc.getRawEncoding())));
     }