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| 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/doc | |
| 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/doc')
| -rw-r--r-- | gcc/doc/tm.texi | 8 | ||||
| -rw-r--r-- | gcc/doc/tm.texi.in | 2 |
2 files changed, 10 insertions, 0 deletions
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi index 622e8cf..c2aa4d0 100644 --- a/gcc/doc/tm.texi +++ b/gcc/doc/tm.texi @@ -11610,6 +11610,14 @@ function version at run-time for a given set of function versions. body must be generated. @end deftypefn +@deftypefn {Target Hook} bool TARGET_PREDICT_DOLOOP_P (struct loop *@var{loop}) +Return true if we can predict it is possible to use a low-overhead loop +for a particular loop. The parameter @var{loop} is a pointer to the loop. +This target hook is required only when the target supports low-overhead +loops, and will help ivopts to make some decisions. +The default version of this hook returns false. +@end deftypefn + @deftypefn {Target Hook} bool TARGET_CAN_USE_DOLOOP_P (const widest_int @var{&iterations}, const widest_int @var{&iterations_max}, unsigned int @var{loop_depth}, bool @var{entered_at_top}) Return true if it is possible to use low-overhead loops (@code{doloop_end} and @code{doloop_begin}) for a particular loop. @var{iterations} gives the diff --git a/gcc/doc/tm.texi.in b/gcc/doc/tm.texi.in index 17560fc..b4d57b8 100644 --- a/gcc/doc/tm.texi.in +++ b/gcc/doc/tm.texi.in @@ -7944,6 +7944,8 @@ to by @var{ce_info}. @hook TARGET_GENERATE_VERSION_DISPATCHER_BODY +@hook TARGET_PREDICT_DOLOOP_P + @hook TARGET_CAN_USE_DOLOOP_P @hook TARGET_INVALID_WITHIN_DOLOOP |