diff options
| author | dnovillo <dnovillo@138bc75d-0d04-0410-961f-82ee72b054a4> | 2005-06-02 17:13:26 +0000 |
|---|---|---|
| committer | dnovillo <dnovillo@138bc75d-0d04-0410-961f-82ee72b054a4> | 2005-06-02 17:13:26 +0000 |
| commit | 7600133d975d4e391db5ed900725414cc43476b9 (patch) | |
| tree | e09fbdae484cb516c5dc0d27b422a4352d83484a /gcc/doc | |
| parent | 091b9f15c89f11e9be69d7b2b721cb9992998dc0 (diff) | |
| download | ppe42-gcc-7600133d975d4e391db5ed900725414cc43476b9.tar.gz ppe42-gcc-7600133d975d4e391db5ed900725414cc43476b9.zip | |
PR 21765
* doc/invoke.texi: Document -ftree-vrp.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@100495 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 94c4b2ead7a..0bcd3d9d85c 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -277,6 +277,7 @@ Objective-C and Objective-C++ Dialects}. -fdump-tree-sra@r{[}-@var{n}@r{]} @gol -fdump-tree-salias @gol -fdump-tree-fre@r{[}-@var{n}@r{]} @gol +-fdump-tree-vrp@r{[}-@var{n}@r{]} @gol -ftree-vectorizer-verbose=@var{n} @gol -fdump-tree-storeccp@r{[}-@var{n}@r{]} @gol -feliminate-dwarf2-dups -feliminate-unused-debug-types @gol @@ -4067,6 +4068,11 @@ file name. Dump each function after applying vectorization of loops. The file name is made by appending @file{.vect} to the source file name. +@item vrp +@opindex fdump-tree-vrp +Dump each function after Value Range Propagation (VRP). The file name +is made by appending @file{.vrp} to the source file name. + @item all @opindex fdump-tree-all Enable all the available tree dumps with the flags provided in this option. @@ -4321,6 +4327,7 @@ also turns on the following optimization flags: -funit-at-a-time @gol -falign-functions -falign-jumps @gol -falign-loops -falign-labels @gol +-ftree-vrp @gol -ftree-pre} Please note the warning under @option{-fgcse} about @@ -4963,6 +4970,15 @@ optimization later. This is enabled by default at @option{-O} and higher. @item -ftree-vectorize Perform loop vectorization on trees. +@item -ftree-vrp +Perform Value Range Propagation on trees. This is similar to the +constant propagation pass, but instead of values, ranges of values are +propagated. This allows the optimizers to remove unnecessary range +checks like array bound checks and null pointer checks. This is +enabled by default at @option{-O2} and higher. Null pointer check +elimination is only done if @option{-fdelete-null-pointer-checks} is +enabled. + @item -ftracer @opindex ftracer Perform tail duplication to enlarge superblock size. This transformation |
