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| author | Alexander Monakov <amonakov@ispras.ru> | 2018-08-29 15:39:12 +0300 |
|---|---|---|
| committer | Alexander Monakov <amonakov@gcc.gnu.org> | 2018-08-29 15:39:12 +0300 |
| commit | 1ca7a4d457a6d4769f3e6fa9f880e58a7a2eb8c8 (patch) | |
| tree | 2f0746ed968bad9b3e551d5bf692a4cfe5e4c3ed /gcc | |
| parent | f5b219ccc233001ee610d5a57ccb22ec4cb24f53 (diff) | |
| download | gcc-1ca7a4d457a6d4769f3e6fa9f880e58a7a2eb8c8.zip gcc-1ca7a4d457a6d4769f3e6fa9f880e58a7a2eb8c8.tar.gz gcc-1ca7a4d457a6d4769f3e6fa9f880e58a7a2eb8c8.tar.bz2 | |
doc: document -ftree-scev-cprop
PR other/86726
* invoke.texi (Optimization Options): List -ftree-scev-cprop.
(-O): Ditto.
(-ftree-scev-cprop): Document.
From-SVN: r263955
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 7 | ||||
| -rw-r--r-- | gcc/doc/invoke.texi | 12 |
2 files changed, 18 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 82d6659..a8a9b2d 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2018-08-29 Alexander Monakov <amonakov@ispras.ru> + + PR other/86726 + * invoke.texi (Optimization Options): List -ftree-scev-cprop. + (-O): Ditto. + (-ftree-scev-cprop): Document. + 2018-08-29 Jan Hubicka <jh@suse.cz> * sreal.h (normalize, normalize_up, normalize_down): Add new_sig/new_exp diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index e37233d..089f844 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -464,7 +464,7 @@ Objective-C and Objective-C++ Dialects}. -ftree-loop-ivcanon -ftree-loop-linear -ftree-loop-optimize @gol -ftree-loop-vectorize @gol -ftree-parallelize-loops=@var{n} -ftree-pre -ftree-partial-pre -ftree-pta @gol --ftree-reassoc -ftree-sink -ftree-slsr -ftree-sra @gol +-ftree-reassoc -ftree-scev-cprop -ftree-sink -ftree-slsr -ftree-sra @gol -ftree-switch-conversion -ftree-tail-merge @gol -ftree-ter -ftree-vectorize -ftree-vrp -funconstrained-commons @gol -funit-at-a-time -funroll-all-loops -funroll-loops @gol @@ -7813,6 +7813,7 @@ compilation time. -ftree-forwprop @gol -ftree-fre @gol -ftree-phiprop @gol +-ftree-scev-cprop @gol -ftree-sink @gol -ftree-slsr @gol -ftree-sra @gol @@ -9120,6 +9121,15 @@ determining number of iterations requires complicated analysis. Later optimizations then may determine the number easily. Useful especially in connection with unrolling. +@item -ftree-scev-cprop +@opindex ftree-scev-cprop +Perform final value replacement. If a variable is modified in a loop +in such a way that its value when exiting the loop can be determined using +only its initial value and the number of loop iterations, replace uses of +the final value by such a computation, provided it is sufficiently cheap. +This reduces data dependencies and may allow further simplifications. +Enabled by default at @option{-O} and higher. + @item -fivopts @opindex fivopts Perform induction variable optimizations (strength reduction, induction |