diff options
| author | Kewen Lin <linkw@gcc.gnu.org> | 2019-06-18 05:08:02 +0000 |
|---|---|---|
| committer | Kewen Lin <linkw@gcc.gnu.org> | 2019-06-18 05:08:02 +0000 |
| commit | 74b5fcf733823b353b331c0ca30e8b71ba98c9cf (patch) | |
| tree | b9ed33a1d95fac033d35268b37e4cf0e4bcf2ca1 /gcc/target.def | |
| parent | 702eb490a864239256203b7fad53e397d3e7fa54 (diff) | |
| download | gcc-74b5fcf733823b353b331c0ca30e8b71ba98c9cf.zip gcc-74b5fcf733823b353b331c0ca30e8b71ba98c9cf.tar.gz gcc-74b5fcf733823b353b331c0ca30e8b71ba98c9cf.tar.bz2 | |
Add predict_doloop_p target hook
Add one target hook predict_doloop_p, it return true if we can predict it
is possible to use a low-overhead loop, it can help ivopts to make some
better decisions.
PR middle-end/80791
* target.def (predict_doloop_p): New hook.
* targhooks.h (default_predict_doloop_p): New declaration.
* targhooks.c (default_predict_doloop_p): New function.
* doc/tm.texi.in (TARGET_PREDICT_DOLOOP_P): New hook.
* doc/tm.texi: Regenerate.
* config/rs6000/rs6000.c (rs6000_predict_doloop_p): New function.
(TARGET_PREDICT_DOLOOP_P): New macro.
* tree-ssa-loop-ivopts.c (generic_predict_doloop_p): New function.
From-SVN: r272405
Diffstat (limited to 'gcc/target.def')
| -rw-r--r-- | gcc/target.def | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/gcc/target.def b/gcc/target.def index 7d52102..71b6972 100644 --- a/gcc/target.def +++ b/gcc/target.def @@ -4236,6 +4236,15 @@ DEFHOOK rtx, (machine_mode mode, rtx result, rtx val, rtx failval), default_speculation_safe_value) +DEFHOOK +(predict_doloop_p, + "Return true if we can predict it is possible to use a low-overhead loop\n\ +for a particular loop. The parameter @var{loop} is a pointer to the loop.\n\ +This target hook is required only when the target supports low-overhead\n\ +loops, and will help ivopts to make some decisions.\n\ +The default version of this hook returns false.", + bool, (struct loop *loop), + default_predict_doloop_p) DEFHOOK (can_use_doloop_p, |