aco/spill: Avoid destroying local next use maps over-eagerly
Recreating these maps in a later block requires allocating fresh memory. Instead, by never shrinking the containing vector in the first place, previously allocated map memory is now re-used. Reviewed-by: Daniel Schürmann <daniel@schuermann.dev> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11925>
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@ -360,7 +360,11 @@ void
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update_local_next_uses(spill_ctx& ctx, Block* block,
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std::vector<std::map<Temp, uint32_t>>& local_next_uses)
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{
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if (local_next_uses.size() < block->instructions.size()) {
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/* Allocate more next-use-maps. Note that by never reducing the vector size, we enable
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* future calls to this function to re-use already allocated map memory. */
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local_next_uses.resize(block->instructions.size());
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}
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local_next_uses[block->instructions.size() - 1].clear();
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for (std::pair<const Temp, std::pair<uint32_t, uint32_t>>& pair :
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