[cfe-commits] r145905 - /cfe/trunk/lib/CodeGen/TargetInfo.cpp

[Eli Friedman]

Author: efriedma
Date: Mon Dec  5 21:08:26 2011
New Revision: 145905

URL: http://llvm.org/viewvc/llvm-project?rev=145905&view=rev
Log:
Minor comment update.


Modified:
    cfe/trunk/lib/CodeGen/TargetInfo.cpp

Modified: cfe/trunk/lib/CodeGen/TargetInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/TargetInfo.cpp?rev=145905&r1=145904&r2=145905&view=diff
==============================================================================
--- cfe/trunk/lib/CodeGen/TargetInfo.cpp (original)
+++ cfe/trunk/lib/CodeGen/TargetInfo.cpp Mon Dec  5 21:08:26 2011
@@ -988,7 +988,9 @@
     // The default CC on x86-64 sets %al to the number of SSA
     // registers used, and GCC sets this when calling an unprototyped
     // function, so we override the default behavior.  However, don't do
-    // that when AVX types are involved.
+    // that when AVX types are involved: the ABI explicitly states it is
+    // undefined, and it doesn't work in practice because of how the ABI
+    // defines varargs anyway.
     if (FI.getCallingConvention() == llvm::CallingConv::C) {
       bool HasAVXType = false;
       for (CGFunctionInfo::const_arg_iterator it = FI.arg_begin(),