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glsl: Mark a set of array elements as accessed using a list of array_deref_range

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Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Ian Romanick
2016-12-15 14:01:28 -08:00
parent 8d499f60c8
commit e92935089b
3 changed files with 253 additions and 0 deletions
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49
src/compiler/glsl/ir_array_refcount.h
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@@ -60,6 +60,34 @@ public:
/** Has the variable been referenced? */
bool is_referenced;
/**
* Mark a set of array elements as accessed.
*
* If every \c array_deref_range is for a single index, only a single
* element will be marked. If any \c array_deref_range is for an entire
* array-of-, then multiple elements will be marked.
*
* Items in the \c array_deref_range list appear in least- to
* most-significant order. This is the \b opposite order the indices
* appear in the GLSL shader text. An array access like
*
* x = y[1][i][3];
*
* would appear as
*
* { { 3, n }, { m, m }, { 1, p } }
*
* where n, m, and p are the sizes of the arrays-of-arrays.
*
* The set of marked array elements can later be queried by
* \c ::is_linearized_index_referenced.
*
* \param dr List of array_deref_range elements to be processed.
* \param count Number of array_deref_range elements to be processed.
*/
void mark_array_elements_referenced(const array_deref_range *dr,
unsigned count);
/** Has a linearized array index been referenced? */
bool is_linearized_index_referenced(unsigned linearized_index) const
{
@@ -80,6 +108,27 @@ private:
*/
unsigned num_bits;
/** Count of nested arrays in the type. */
unsigned array_depth;
/**
* Recursive part of the public mark_array_elements_referenced method.
*
* The recursion occurs when an entire array-of- is accessed. See the
* implementation for more details.
*
* \param dr List of array_deref_range elements to be
* processed.
* \param count Number of array_deref_range elements to be
* processed.
* \param scale Current offset scale.
* \param linearized_index Current accumulated linearized array index.
*/
void mark_array_elements_referenced(const array_deref_range *dr,
unsigned count,
unsigned scale,
unsigned linearized_index);
friend class array_refcount_test;
};