mirror of https://gitlab.freedesktop.org/mesa/mesa
mesa: Detect and provide macros for function attributes pure and const.
These are really useful hints to the compiler in the absence of link-time optimization, and I'm going to use them in VC4. I've made the const attribute be ATTRIBUTE_CONST unlike other function attributes, because we have other things in the tree #defining CONST for their own unrelated purposes. v2: Alphabetize. Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> (v1)
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@ -205,10 +205,12 @@ AX_GCC_BUILTIN([__builtin_popcount])
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AX_GCC_BUILTIN([__builtin_popcountll])
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AX_GCC_BUILTIN([__builtin_unreachable])
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AX_GCC_FUNC_ATTRIBUTE([const])
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AX_GCC_FUNC_ATTRIBUTE([flatten])
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AX_GCC_FUNC_ATTRIBUTE([format])
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AX_GCC_FUNC_ATTRIBUTE([malloc])
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AX_GCC_FUNC_ATTRIBUTE([packed])
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AX_GCC_FUNC_ATTRIBUTE([pure])
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AX_GCC_FUNC_ATTRIBUTE([unused])
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AX_GCC_FUNC_ATTRIBUTE([warn_unused_result])
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@ -103,6 +103,17 @@ do { \
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#define assume(expr) assert(expr)
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#endif
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/* Attribute const is used for functions that have no effects other than their
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* return value, and only rely on the argument values to compute the return
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* value. As a result, calls to it can be CSEed. Note that using memory
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* pointed to by the arguments is not allowed for const functions.
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*/
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#ifdef HAVE_FUNC_ATTRIBUTE_CONST
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#define ATTRIBUTE_CONST __attribute__((__const__))
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#else
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#define ATTRIBUTE_CONST
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#endif
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#ifdef HAVE_FUNC_ATTRIBUTE_FLATTEN
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#define FLATTEN __attribute__((__flatten__))
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#else
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@ -130,6 +141,15 @@ do { \
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#define PACKED
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#endif
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/* Attribute pure is used for functions that have no effects other than their
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* return value. As a result, calls to it can be dead code eliminated.
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*/
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#ifdef HAVE_FUNC_ATTRIBUTE_PURE
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#define PURE __attribute__((__pure__))
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#else
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#define PURE
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#endif
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#ifdef __cplusplus
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/**
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* Macro function that evaluates to true if T is a trivially
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