GCC Middle and Back End API Reference

#include <cfgloop.h>
Data Fields  
edge  out_edge 
edge  in_edge 
bool  simple_p 
bool  const_iter 
unsigned HOST_WIDEST_INT  niter 
rtx  assumptions 
rtx  noloop_assumptions 
rtx  infinite 
bool  signed_p 
enum machine_mode  mode 
rtx  niter_expr 
The description of an exit from the loop and of the number of iterations till we take the exit.
rtx niter_desc::assumptions 
Assumptions under that the rest of the information is valid.
Referenced by check_simple_exit().
bool niter_desc::const_iter 
True if the loop iterates the constant number of times.
Referenced by decide_peel_simple().
edge niter_desc::in_edge 
The other edge leading from the condition.
rtx niter_desc::infinite 
Condition under that the loop is infinite.
Referenced by check_simple_exit().
enum machine_mode niter_desc::mode 
The mode in that niter_expr should be computed.
Referenced by split_edge_and_insert().
unsigned HOST_WIDEST_INT niter_desc::niter 
Number of iterations if constant.
Referenced by decide_peel_simple(), and split_edge_and_insert().
rtx niter_desc::niter_expr 
The number of iterations of the loop.
Referenced by decide_peel_simple(), and split_edge_and_insert().
rtx niter_desc::noloop_assumptions 
Assumptions under that the loop ends before reaching the latch, even if value of niter_expr says otherwise.
Referenced by decide_peel_simple().
edge niter_desc::out_edge 
The edge out of the loop.
bool niter_desc::signed_p 
Whether the comparison is signed.
bool niter_desc::simple_p 
True if we are able to say anything about number of iterations of the loop.
Referenced by check_simple_exit(), and decide_peel_simple().