hw_doloop_hooks Struct Reference
#include <hw-doloop.h>
Collaboration diagram for hw_doloop_hooks:
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
Examine INSN. If it is a suitable doloop_end pattern, return the
iteration register, which should be a single hard register.
Otherwise, return NULL_RTX.
Referenced by discover_loops().
| void(* hw_doloop_hooks::fail)(hwloop_info loop) |
Handle a loop that was marked bad for any reason. This could be
used to split the doloop_end pattern.
| bool(* hw_doloop_hooks::opt)(hwloop_info loop) |
Optimize LOOP. The target should perform any additional analysis
(e.g. checking that the loop isn't too long), and then perform
its transformations. Return true if successful, false if the
loop should be marked bad. If it returns false, the FAIL
function is called.
The documentation for this struct was generated from the following file:
