Re: need help with builtin function prototypes
I'm hoping I can get it to do what I want, if only I can get the MI to treat the function definition given to it by the target as the one true definition, and not just some advisory one.
Re: need help with builtin function prototypes
DJ Delorie [EMAIL PROTECTED] writes: Is there a trick to this? I need this type of functionality because some builtins modify multiple values, so a simple return value is insufficient, plus this worked with older versions of gcc so our users are used to it syntax-wise. I've never found a good solution for builtins which return multiple values. The best approximation I found was to return a magic structure, and to provide other builtin functions to get the values from the structure (defining the structure in the backend was problematic when using C++). It doesn't sound like that will help you, though, if you are stuck with the existing syntax. Ian
Re: need help with builtin function prototypes
On Thu, 9 Aug 2007, DJ Delorie wrote: Could someone provide a hint for me? I'm trying to put in real prototypes for a builtin function where the arguments don't follow the default promotion rules. Specifically, one of the arguments is a reference type (like C++'s int). However, I'm bumping into two problems: 1. The compiler emits a compatibility warning: dj.c:4: warning: incompatible implicit declaration of built-in function 'mep_and' 2. The compiler seems to be using the implicit declaration instead of the builtin one, resulting in the builtin's arguments being incorrect, especially when optimizing: dj.c:4: error: non-lvalue passed to argument 1 of `mep_and' Is there a trick to this? I need this type of functionality because some builtins modify multiple values, so a simple return value is insufficient, plus this worked with older versions of gcc so our users are used to it syntax-wise. I don't know about using reference types, but there are several math builtins that return multiple values, the extra ones via pointer arguments. E.g. see frexp, lgamma_r, modf, remquo and/or sincos. --Kaveh -- Kaveh R. Ghazi [EMAIL PROTECTED]
Re: need help with builtin function prototypes
I don't know about using reference types, but there are several math builtins that return multiple values, the extra ones via pointer arguments. E.g. see frexp, lgamma_r, modf, remquo and/or sincos. Like I said, I'm kinda locked into the syntax. People have been using these builtins for many years now. Everything was fine when we expanded the builtins to insns before optimization, and we could block optimizations using RTL, but we don't have that option with tree optimizations.
