If the mangled name is viewed as the name emitted into IR code then the mangled name of an intrinsic is the intrinsic's name.
The name is unique because of the `llvm.` prefix. The only point is that overloaded intrinsics must be resolved earlier.
This commit moves the resolution of oveloaded intrinsics into the semantic analysis pass. The
The performance impact should be completely immeasurable,
but the main benefit is that this makes IR dumps slightly
nicer to look at (as the redundant "empty:" labels are
now omitted entirely).
If the comment about this function is still right (can be called recursively) then the assignment
to irFty should be done after all functions are called.
Takes advantage of move assignment, too.
Adds some constructors and moves the code to the header file. Uses some of the new constructors.
A big problem with the source are the different strategies used for otherwise similar classes.
E.g. a IrField registers itself with the VarDeclaration. Same is required for IrParameter, but
in this case it is done by the caller.
The remaining ones should also be easy to remove with a
closer look at the situation.
Ideally, we would get rid of all of them at some point and
use safe wrapper functions for accessing the IrDsymbol
associated with a given declaration (which would emit the
declarations on the fly if not already present).
This commit fundamentally changes the way symbol emission in
LDC works: Previously, whenever a declaration was used in some
way, the compiler would check whether it actually needs to be
defined in the currently processed module, based only on the
symbol itself. This lack of contextual information proved to
be a major problem in correctly handling emission of templates
(see e.g. #454).
Now, the DtoResolve…() family of functions and similar only
ever declare the symbols, and definition is handled by doing
a single pass over Module::members for the root module. This
is the same strategy that DMD uses as well, which should
also reduce the maintainance burden down the road (which is
important as during the last few releases, there was pretty
much always a symbol emission related problem slowing us
down).
Our old approach might have been a bit better tuned w.r.t.
avoiding emission of unneeded template instances, but 2.064
will bring improvements here (DMD: FuncDeclaration::toObjFile).
Barring such issues, the change shoud also marginally improve
compile times because of declarations no longer being emitted
when they are not needed.
In the future, we should also consider refactoring the code
so that it no longer directly accesses Dsymbol::ir but uses
wrapper functions that ensure that the appropriate
DtoResolve…() function has been called.
GitHub: Fixes#454.
The issue was that when merging in the old attributes, attrs
wasn't assigned to, thus silently dropping all of them
(leading e.g. to noinline being omitted on functions containing
inline asm).
The new code hopefully also makes the intent clearer.
Starting with LLVM 3.3 a new parameter attribute `returned` is supported.
The attribute states that the parameter is the return value, too. This is the
case in constructors. (Destructors and postblits do not return `this`.)
Attribute `returned` is now added to the `this` parameter of constructors.
