similar to: [LLVMdev] builtin_apply?

Interesting. Just having __builtin_apply_args() (and a correspoding __builtin_apply_args_size()), would make it possible to do a memcpy store of arguments to a (varargs) function, which sometimes is useful for our users (for debug/trace purposes). /Patrik Hägglund From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On Behalf Of Eric Christopher Sent: den 2 oktober 2013

Indeed. However, I wouldn't have called variable number of arguments a "sophisticated feature". :-) /Patrik Hägglund -----Original Message----- From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On Behalf Of Krzysztof Parzyszek Sent: den 2 oktober 2013 19:12 To: llvmdev at cs.uiuc.edu Subject: Re: [LLVMdev] builtin_apply? I think varargs functions would

I would also like so tee support for __builtin_apply*. We use it in macros and such. If others are interested, please speak up. -Jan On 02/10/2013 20:51, Patrik Hägglund H wrote: > Indeed. However, I wouldn't have called variable number of arguments a "sophisticated feature". :-) > > /Patrik Hägglund > > -----Original Message----- > From: llvmdev-bounces at

I think varargs functions would be an example of where this builtin would not work. -K On 10/2/2013 2:32 AM, Patrik Hägglund H wrote: > Interesting. Just having __builtin_apply_args() (and a correspoding > __builtin_apply_args_size()), would make it possible to do a memcpy > store of arguments to a (varargs) function, which sometimes is useful > for our users (for debug/trace

__builtin_apply is an abomination. Even in GCC it is held to have been a bad idea. --eric On Oct 1, 2013 10:03 PM, "reed kotler" <rkotler at mips.com> wrote: > why does clang not support builtin_apply? > > 6.5 Constructing Function Calls > > Using the built-in functions described below, you can record the arguments > a function received, and call another

The __builtin_va_arg_pack() and __builtin_va_arg_pack_len() builtins are useful in this context and, unlike __builtin_apply(), are possible to implement correctly in the general case. I believe that some GNU system headers use them when they are available, so they are probably worth supporting. I'd love to see __builtin_apply() implemented and working properly too, but on most architectures