diff options
Diffstat (limited to 'gcc/doc/invoke.texi')
| -rw-r--r-- | gcc/doc/invoke.texi | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index a057a0cbc7f..023cf720fef 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -334,7 +334,7 @@ Objective-C and Objective-C++ Dialects}. -ffinite-math-only -fno-signed-zeros @gol -fno-toplevel-reorder -fno-trapping-math -fno-zero-initialized-in-bss @gol -fomit-frame-pointer -foptimize-register-move @gol --foptimize-sibling-calls -fprefetch-loop-arrays @gol +-foptimize-sibling-calls -fpredictive-commoning -fprefetch-loop-arrays @gol -fprofile-generate -fprofile-use @gol -fregmove -frename-registers @gol -freorder-blocks -freorder-blocks-and-partition -freorder-functions @gol @@ -4495,7 +4495,7 @@ different text / bss / data / heap / stack / dso start locations. @item -fdump-unnumbered @opindex fdump-unnumbered When doing debugging dumps (see @option{-d} option above), suppress instruction -numbers, line number note and address output. This makes it more feasible to +numbers and address output. This makes it more feasible to use diff on debugging dumps for compiler invocations with different options, in particular with and without @option{-g}. @@ -5001,7 +5001,8 @@ invoking @option{-O2} on programs that use computed gotos. @opindex O3 Optimize yet more. @option{-O3} turns on all optimizations specified by @option{-O2} and also turns on the @option{-finline-functions}, -@option{-funswitch-loops} and @option{-fgcse-after-reload} options. +@option{-funswitch-loops}, @option{-fpredictive-commoning} and +@option{-fgcse-after-reload} options. @item -O0 @opindex O0 @@ -5712,6 +5713,14 @@ This optimization is enabled by default. With this option, the compiler will create multiple copies of some local variables when unrolling a loop which can result in superior code. +@item -fpredictive-commoning +@opindex fpredictive-commoning +Perform predictive commoning optimization, i.e., reusing computations +(especially memory loads and stores) performed in previous +iterations of loops. + +This option is enabled at level @option{-O3}. + @item -fprefetch-loop-arrays @opindex fprefetch-loop-arrays If supported by the target machine, generate instructions to prefetch |