GCC Middle and Back End API Reference
Data Fields
hw_doloop_hooks Struct Reference

#include <hw-doloop.h>

Data Fields

rtx(* end_pattern_reg )(rtx insn)
bool(* opt )(hwloop_info loop)
void(* fail )(hwloop_info loop)

Detailed Description

A set of hooks to be defined by a target that wants to use the reorg_loops
   functionality.

   reorg_loops is intended to handle cases where special hardware loop
   setup instructions are required before the loop, for example to set
   up loop counter registers that are not exposed to the register
   allocator, or to inform the hardware about loop bounds.

   reorg_loops performs analysis to discover loop_end patterns created
   by the earlier loop-doloop pass, and sets up a hwloop_info
   structure for each such insn it finds.  It then tries to discover
   the basic blocks containing the loop by tracking the lifetime of
   the iteration register.

   If a valid loop can't be found, the FAIL function is called;
   otherwise the OPT function is called for each loop, visiting
   innermost loops first and ascending.

Field Documentation

rtx(* hw_doloop_hooks::end_pattern_reg)(rtx insn)

Referenced by discover_loops().

void(* hw_doloop_hooks::fail)(hwloop_info loop)

Referenced by optimize_loop().

bool(* hw_doloop_hooks::opt)(hwloop_info loop)

Referenced by optimize_loop().

The documentation for this struct was generated from the following file: