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author | Bill Schmidt <wschmidt@linux.ibm.com> | 2012-07-18 15:15:36 +0000 |
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committer | William Schmidt <wschmidt@gcc.gnu.org> | 2012-07-18 15:15:36 +0000 |
commit | 75cfe445d9e4e31043757b9aaec0fa9e33d7d7f1 (patch) | |
tree | 70fc9421478cd9042bf16fdfce0894709050cc2b /gcc/doc | |
parent | a712b009c56fde0f26e757509b1019d6fb7b6ed6 (diff) | |
download | gcc-75cfe445d9e4e31043757b9aaec0fa9e33d7d7f1.zip gcc-75cfe445d9e4e31043757b9aaec0fa9e33d7d7f1.tar.gz gcc-75cfe445d9e4e31043757b9aaec0fa9e33d7d7f1.tar.bz2 |
invoke.texi: Add -fhoist-adjacent-loads and -ftree-slsr to list of flags controlling...
2012-07-18 Bill Schmidt <wschmidt@linux.ibm.com>
* doc/invoke.texi: Add -fhoist-adjacent-loads and -ftree-slsr to list
of flags controlling optimization; add -ftree-slsr to list of flags
enabled by default at -O; add -fhoist-adjacent-loads to list of flags
enabled by default at -O2; add -fvect-cost-model to list of flags
enabled by default at -O3; document -fhoist-adjacent-loads and
-ftree-slsr.
* opts.c (default_option): Make -ftree-slsr default at -O1 and above.
* gimple-ssa-strength-reduction.c (gate_strength_reduction): Use
flag_tree_slsr.
* common.opt: Add -ftree-slsr with flag_tree_slsr.
From-SVN: r189617
Diffstat (limited to 'gcc/doc')
-rw-r--r-- | gcc/doc/invoke.texi | 27 |
1 files changed, 23 insertions, 4 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index bbd99b7..d83f589 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -364,7 +364,8 @@ Objective-C and Objective-C++ Dialects}. -ffast-math -ffinite-math-only -ffloat-store -fexcess-precision=@var{style} @gol -fforward-propagate -ffp-contract=@var{style} -ffunction-sections @gol -fgcse -fgcse-after-reload -fgcse-las -fgcse-lm -fgraphite-identity @gol --fgcse-sm -fif-conversion -fif-conversion2 -findirect-inlining @gol +-fgcse-sm -fhoist-adjacent-loads -fif-conversion @gol +-fif-conversion2 -findirect-inlining @gol -finline-functions -finline-functions-called-once -finline-limit=@var{n} @gol -finline-small-functions -fipa-cp -fipa-cp-clone -fipa-matrix-reorg @gol -fipa-pta -fipa-profile -fipa-pure-const -fipa-reference @gol @@ -413,8 +414,8 @@ Objective-C and Objective-C++ Dialects}. -ftree-phiprop -ftree-loop-distribution -ftree-loop-distribute-patterns @gol -ftree-loop-ivcanon -ftree-loop-linear -ftree-loop-optimize @gol -ftree-parallelize-loops=@var{n} -ftree-pre -ftree-partial-pre -ftree-pta @gol --ftree-reassoc @gol --ftree-sink -ftree-sra -ftree-switch-conversion -ftree-tail-merge @gol +-ftree-reassoc -ftree-sink -ftree-slsr -ftree-sra @gol +-ftree-switch-conversion -ftree-tail-merge @gol -ftree-ter -ftree-vect-loop-version -ftree-vectorize -ftree-vrp @gol -funit-at-a-time -funroll-all-loops -funroll-loops @gol -funsafe-loop-optimizations -funsafe-math-optimizations -funswitch-loops @gol @@ -6260,6 +6261,7 @@ compilation time. -ftree-forwprop @gol -ftree-fre @gol -ftree-phiprop @gol +-ftree-slsr @gol -ftree-sra @gol -ftree-pta @gol -ftree-ter @gol @@ -6287,6 +6289,7 @@ also turns on the following optimization flags: -fdevirtualize @gol -fexpensive-optimizations @gol -fgcse -fgcse-lm @gol +-fhoist-adjacent-loads @gol -finline-small-functions @gol -findirect-inlining @gol -fipa-sra @gol @@ -6312,6 +6315,7 @@ Optimize yet more. @option{-O3} turns on all optimizations specified by @option{-O2} and also turns on the @option{-finline-functions}, @option{-funswitch-loops}, @option{-fpredictive-commoning}, @option{-fgcse-after-reload}, @option{-ftree-vectorize}, +@option{-fvect-cost-model}, @option{-ftree-partial-pre} and @option{-fipa-cp-clone} options. @item -O0 @@ -7130,6 +7134,13 @@ This flag is enabled by default at @option{-O} and higher. Perform hoisting of loads from conditional pointers on trees. This pass is enabled by default at @option{-O} and higher. +@item -fhoist-adjacent-loads +@opindex hoist-adjacent-loads +Speculatively hoist loads from both branches of an if-then-else if the +loads are from adjacent locations in the same structure and the target +architecture has a conditional move instruction. This flag is enabled +by default at @option{-O2} and higher. + @item -ftree-copy-prop @opindex ftree-copy-prop Perform copy propagation on trees. This pass eliminates unnecessary @@ -7530,6 +7541,13 @@ defining expression. This results in non-GIMPLE code, but gives the expanders much more complex trees to work on resulting in better RTL generation. This is enabled by default at @option{-O} and higher. +@item -ftree-slsr +@opindex ftree-slsr +Perform straight-line strength reduction on trees. This recognizes related +expressions involving multiplications and replaces them by less expensive +calculations when possible. This is enabled by default at @option{-O} and +higher. + @item -ftree-vectorize @opindex ftree-vectorize Perform loop vectorization on trees. This flag is enabled by default at @@ -7551,7 +7569,8 @@ except at level @option{-Os} where it is disabled. @item -fvect-cost-model @opindex fvect-cost-model -Enable cost model for vectorization. +Enable cost model for vectorization. This option is enabled by default at +@option{-O3}. @item -ftree-vrp @opindex ftree-vrp |