Add _Float16 as a C/C++ source language type

This adds _Float16 as a source language type, which is a 16-bit floating point
type defined in C11 extension ISO/IEC TS 18661-3.

In follow up patches documentation and more tests will be added.

Differential Revision: https://reviews.llvm.org/D33719

llvm-svn: 312781

1 files changed, 9 insertions, 0 deletions

diff --git a/clang/lib/Lex/LiteralSupport.cpp b/clang/lib/Lex/LiteralSupport.cpp
index f1738483f0a..5f6e5efa232 100644
--- a/clang/lib/Lex/LiteralSupport.cpp
+++ b/clang/lib/Lex/LiteralSupport.cpp
@@ -544,6 +544,7 @@ NumericLiteralParser::NumericLiteralParser(StringRef TokSpelling,
   isHalf = false;
   isFloat = false;
   isImaginary = false;
+  isFloat16 = false;
   isFloat128 = false;
   MicrosoftInteger = 0;
   hadError = false;
@@ -588,6 +589,13 @@ NumericLiteralParser::NumericLiteralParser(StringRef TokSpelling,
       if (!isFPConstant) break;  // Error for integer constant.
       if (isHalf || isFloat || isLong || isFloat128)
         break; // HF, FF, LF, QF invalid.
+
+      if (s + 2 < ThisTokEnd && s[1] == '1' && s[2] == '6') {
+          s += 2; // success, eat up 2 characters.
+          isFloat16 = true;
+          continue;
+      }
+
       isFloat = true;
       continue;  // Success.
     case 'q':    // FP Suffix for "__float128"
@@ -681,6 +689,7 @@ NumericLiteralParser::NumericLiteralParser(StringRef TokSpelling,
         isUnsigned = false;
         isLongLong = false;
         isFloat = false;
+        isFloat16 = false;
         isHalf = false;
         isImaginary = false;
         MicrosoftInteger = 0;