This attribute indicates that the inliner should attempt to inline
this function into callers whenever possible, ignoring any active
inlining size threshold for this caller.
-``cold``
- This attribute indicates that this function is rarely called. When
- computing edge weights, basic blocks post-dominated by a cold
- function call are also considered to be cold; and, thus, given low
- weight.
``builtin``
This indicates that the callee function at a call site should be
recognized as a built-in function, even though the function's declaration
- uses the ``nobuiltin'' attribute. This is only valid at call sites for
+ uses the ``nobuiltin`` attribute. This is only valid at call sites for
direct calls to functions which are declared with the ``nobuiltin``
attribute.
+``cold``
+ This attribute indicates that this function is rarely called. When
+ computing edge weights, basic blocks post-dominated by a cold
+ function call are also considered to be cold; and, thus, given low
+ weight.
``nonlazybind``
This attribute suppresses lazy symbol binding for the function. This
may make calls to the function faster, at the cost of extra program
passes make choices that keep the code size of this function low,
and otherwise do optimizations specifically to reduce code size.
``readnone``
- This attribute indicates that the function computes its result (or
- decides to unwind an exception) based strictly on its arguments,
+ On a function, this attribute indicates that the function computes its
+ result (or decides to unwind an exception) based strictly on its arguments,
without dereferencing any pointer arguments or otherwise accessing
any mutable state (e.g. memory, control registers, etc) visible to
caller functions. It does not write through any pointer arguments
(including ``byval`` arguments) and never changes any state visible
to callers. This means that it cannot unwind exceptions by calling
the ``C++`` exception throwing methods.
+
+ On an argument, this attribute indicates that the function does not
+ dereference that pointer argument, even though it may read or write the
+ memory that the pointer points to if accessed through other pointers.
``readonly``
- This attribute indicates that the function does not write through
- any pointer arguments (including ``byval`` arguments) or otherwise
+ On a function, this attribute indicates that the function does not write
+ through any pointer arguments (including ``byval`` arguments) or otherwise
modify any state (e.g. memory, control registers, etc) visible to
caller functions. It may dereference pointer arguments and read
state that may be set in the caller. A readonly function always
called with the same set of arguments and global state. It cannot
unwind an exception by calling the ``C++`` exception throwing
methods.
+
+ On an argument, this attribute indicates that the function does not write
+ through this pointer argument, even though it may write to the memory that
+ the pointer points to.
``returns_twice``
This attribute indicates that this function can return twice. The C
``setjmp`` is an example of such a function. The compiler disables