llvm::FeatureIndex

Synopsis

Declared in <llvm/Analysis/InlineModelFeatureMaps.h>

enum class FeatureIndex : size_t;

Description

Not all features listed in FeatureIndex are used by the ML model. Specifically, callee_embedding and caller_embedding are used only when the usage of IR2Vec embeddings is explicitly enabled. Meaning, the size/number of features is not static. So, we cannot determine number of features based on the number of elements in this enum. Cost-feature indices come first and match INLINE_COST_FEATURE_ITERATOR; remaining values match INLINE_FEATURE_ITERATOR (comments cannot live inside those X-macros).

Members

Name	Description
`sroa_savings`	Savings from SROA (scalar replacement of aggregates).
`sroa_losses`	Losses from SROA (scalar replacement of aggregates).
`load_elimination`	Cost of load elimination in the call.
`call_penalty`	Accumulation of penalty applied to call sites when inlining.
`call_argument_setup`	Accumulation of call argument setup costs.
`load_relative_intrinsic`	Accumulation of costs of loading relative intrinsics.
`lowered_call_arg_setup`	Accumulation of cost of lowered call argument setups.
`indirect_call_penalty`	Accumulation of costs for indirect calls.
`jump_table_penalty`	Accumulation of costs for jump tables.
`case_cluster_penalty`	Accumulation of costs for case clusters.
`switch_default_dest_penalty`	Accumulation of costs for switch default destination.
`switch_penalty`	Accumulation of costs for switch statements.
`unsimplified_common_instructions`	Costs from unsimplified common instructions.
`num_loops`	Number of loops in the caller.
`dead_blocks`	Number of dead blocks in the caller.
`simplified_instructions`	Number of simplified instructions.
`constant_args`	Number of constant arguments in the call site.
`constant_offset_ptr_args`	Number of constant offset pointer args in the call site.
`callsite_cost`	Estimated cost of the call site.
`cold_cc_penalty`	Penalty for a cold calling convention.
`last_call_to_static_bonus`	Bonus for being the last call to static.
`is_multiple_blocks`	Boolean; is the callee multiple blocks.
`nested_inlines`	Would the default inliner perform nested inlining.
`nested_inline_cost_estimate`	Estimate of the accumulated cost of nested inlines.
`threshold`	Threshold for the heuristic inliner.
`callee_basic_block_count`	Number of basic blocks of the callee.
`callsite_height`	Position of the call site in the original call graph, measured from the farthest SCC.
`node_count`	Total current number of defined functions in the module.
`nr_ctant_params`	Number of parameters in the call site that are constants.
`cost_estimate`	Total cost estimate (threshold - free).
`edge_count`	Total number of calls in the module.
`caller_users`	Number of module-internal users of the caller, +1 if exposed externally.
`caller_conditionally_executed_blocks`	Number of blocks reached from a conditional instruction in the caller.
`caller_basic_block_count`	Number of basic blocks in the caller.
`callee_conditionally_executed_blocks`	Number of blocks reached from a conditional instruction in the callee.
`callee_users`	Number of module-internal users of the callee, +1 if exposed externally.
`is_callee_avail_external`	Whether the callee has available-externally linkage.
`is_caller_avail_external`	Whether the caller has available-externally linkage.
`callee_embedding`	IR2Vec embedding of the callee (optional).
`caller_embedding`	IR2Vec embedding of the caller (optional).

Non-Member Functions

Name	Description
`inlineCostFeatureToMlFeature`	Map an inline-cost feature index to the corresponding ML feature index.