[cfe-commits] r47120 - /cfe/trunk/NOTES.txt

[Nate Begeman]

Author: sampo
Date: Thu Feb 14 02:19:48 2008
New Revision: 47120

URL: http://llvm.org/viewvc/llvm-project?rev=47120&view=rev
Log:
Completed note

Modified:
    cfe/trunk/NOTES.txt

Modified: cfe/trunk/NOTES.txt
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/NOTES.txt?rev=47120&r1=47119&r2=47120&view=diff

==============================================================================
--- cfe/trunk/NOTES.txt (original)
+++ cfe/trunk/NOTES.txt Thu Feb 14 02:19:48 2008
@@ -28,32 +28,6 @@
 
 //===---------------------------------------------------------------------===//
 
-When we go to reimplement <tgmath.h>, we should do it more intelligently than
-the GCC-supplied header.  EDG has an interesting __generic builtin that provides
-overloading for C:
-http://www.edg.com/docs/edg_cpp.pdf
-
-For example, they have:
- #define sin(x) __generic(x,,, sin, sinf, sinl, csin, csinf,csinl)(x) 
-
-It's unclear to me why you couldn't just have a builtin like: 
-  __builtin_overload(1, arg1,              impl1, impl2, impl3)
-  __builtin_overload(2, arg1, arg2,        impl1, impl2, impl3)
-  __builtin_overload(3, arg1, arg2, arg3,  impl1, impl2, impl3)
-  
-Where the compiler would just pick the right "impl" based on the arguments
-provided.  One nasty detail is that some arithmetic promotions most be done for
-use by the tgmath.h stuff, but it would be nice to be able to handle vectors
-etc as well without huge globs of macros.  With the above scheme, you could
-use:
-
- #define sin(x) __builtin_overload(1, x, sin, sinf, sinl, csin, csinf,csinl)(x) 
-
-and not need to keep track of which argument to "__generic" corresponds to which
-type, etc.
-
-//===---------------------------------------------------------------------===//
-
 To time GCC preprocessing speed without output, use:
    "time gcc -MM file"
 This is similar to -Eonly.