diff options
| author | Jakub Jelinek <jakub@redhat.com> | 2009-02-20 13:56:01 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2009-02-20 13:56:01 +0100 |
| commit | b1fb9f569958b2f6127f32495821a5b69c0a2c33 (patch) | |
| tree | c37b4e8fdb620aa7e10238c591d1e5c0c5753af2 /gcc/doc | |
| parent | da9c199f2cbefd192f9ec89579c7a627fa113bfc (diff) | |
| download | gcc-b1fb9f569958b2f6127f32495821a5b69c0a2c33.zip gcc-b1fb9f569958b2f6127f32495821a5b69c0a2c33.tar.gz gcc-b1fb9f569958b2f6127f32495821a5b69c0a2c33.tar.bz2 | |
re PR middle-end/39157 (Code that compiles fine in 1GB of memory with 4.1.2 requires > 20GB in 4.2.* and higher)
PR middle-end/39157
* Makefile.in (loop-invariant.o): Depend on $(PARAMS_H).
* params.h (LOOP_INVARIANT_MAX_BBS_IN_LOOP): Define.
* params.def (loop-invariant-max-bbs-in-loop): New parameter.
* opts.c (decode_options): Set loop-invariant-max-bbs-in-loop
parameter to 1000 for -O1 by default.
* doc/invoke.texi (loop-invariant-max-bbs-in-loop): Document new
parameter.
* loop-invariant.c: Include params.h.
(move_loop_invariants): Don't call move_single_loop_invariants on
very large loops.
From-SVN: r144320
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index f52b643..f12124c 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -7766,6 +7766,13 @@ lower quality register allocation algorithm will be used. The algorithm do not use pseudo-register conflicts. The default value of the parameter is 2000. +@item loop-invariant-max-bbs-in-loop +Loop invariant motion can be very expensive, both in compile time and +in amount of needed compile time memory, with very large loops. Loops +with more basic blocks than this parameter won't have loop invariant +motion optimization performed on them. The default value of the +parameter is 1000 for -O1 and 10000 for -O2 and above. + @end table @end table |