Basic Block Execution Frequency

Execution frequencies specify how often a basic block is expected to get executed during execution of a function. More...

Functions
void	ir_estimate_execfreq (ir_graph *irg)
	Estimates execution frequency of a graph. More...
double	get_block_execfreq (const ir_node *block)
	Returns execution frequency of block block. More...

Detailed Description

Execution frequencies specify how often a basic block is expected to get executed during execution of a function.

For example the start block has a natural execution frequency of 1.0, the two branches of a simple if 0.5, nodes in a simple loop 10.0 ... Execution frequencies can either get estimated based on the structure of the control flow graph or can be calculated based on profile information.

Function Documentation

double get_block_execfreq

(

const ir_node *

block

)

Returns execution frequency of block block.

void ir_estimate_execfreq

(

ir_graph *

irg

)

Estimates execution frequency of a graph.

You can query the frequencies with get_block_execfreq().