Add a better comment to explain what is going on.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2139 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/AsmParser/Lexer.l b/lib/AsmParser/Lexer.l
index a5cb4eff2658dbab93caadd7fc94a36aeb2048f5..9cfe9fd78e5ad5f0cc48bed66566ade2de99047e 100644 (file)
--- a/lib/AsmParser/Lexer.l
+++ b/lib/AsmParser/Lexer.l
@@ -70,7 +70,10 @@ static double HexToFP(const char *Buffer) {
 
   assert(sizeof(double) == sizeof(Result) &&
          "Data sizes incompatible on this target!");
-  void *ProxyPointer = &Result;  // Break TBAA correctly
+  // Behave nicely in the face of C TBAA rules... see:
+  // http://www.nullstone.com/htmls/category/aliastyp.htm
+  //
+  char *ProxyPointer = (char*)&Result;
   return *(double*)ProxyPointer;   // Cast Hex constant to double
 }