[LangRef] add note about format of FP types

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@328105 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/docs/LangRef.rst b/docs/LangRef.rst
index dce25c5..55b9621 100644 (file)
--- a/docs/LangRef.rst
+++ b/docs/LangRef.rst
@@ -2577,6 +2577,10 @@ Floating-Point Types
    * - ``ppc_fp128``
      - 128-bit floating-point value (two 64-bits)
 
+The binary format of half, float, double, and fp128 correspond to the
+IEEE-754-2008 specifications for binary16, binary32, binary64, and binary128
+respectively.
+
 X86_mmx Type
 """"""""""""