diff options
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 21 | ||||
| -rw-r--r-- | gcc/doc/passes.texi | 7 |
2 files changed, 4 insertions, 24 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 4cb1c1599d4..567dc5caf92 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -315,7 +315,7 @@ Objective-C and Objective-C++ Dialects}. -fsignaling-nans -fsingle-precision-constant -fspeculative-prefetching @gol -fstrength-reduce -fstrict-aliasing -ftracer -fthread-jumps @gol -funroll-all-loops -funroll-loops -fpeel-loops @gol --funswitch-loops -fold-unroll-loops -fold-unroll-all-loops @gol +-funswitch-loops @gol -ftree-pre -ftree-ccp -ftree-dce -ftree-loop-optimize @gol -ftree-loop-linear -ftree-loop-im -ftree-loop-ivcanon -fivopts @gol -ftree-dominator-opts -ftree-dse -ftree-copyrename @gol @@ -4423,8 +4423,7 @@ redundant spilling. @item -floop-optimize @opindex floop-optimize Perform loop optimizations: move constant expressions out of loops, simplify -exit test conditions and optionally do strength-reduction and loop unrolling as -well. +exit test conditions and optionally do strength-reduction as well. Enabled at levels @option{-O}, @option{-O2}, @option{-O3}, @option{-Os}. @@ -5222,22 +5221,6 @@ at level @option{-O1} Move branches with loop invariant conditions out of the loop, with duplicates of the loop on both branches (modified according to result of the condition). -@item -fold-unroll-loops -@opindex fold-unroll-loops -Unroll loops whose number of iterations can be determined at compile -time or upon entry to the loop, using the old loop unroller whose loop -recognition is based on notes from frontend. @option{-fold-unroll-loops} implies -both @option{-fstrength-reduce} and @option{-frerun-cse-after-loop}. This -option makes code larger, and may or may not make it run faster. - -@item -fold-unroll-all-loops -@opindex fold-unroll-all-loops -Unroll all loops, even if their number of iterations is uncertain when -the loop is entered. This is done using the old loop unroller whose loop -recognition is based on notes from frontend. This usually makes programs run more slowly. -@option{-fold-unroll-all-loops} implies the same options as -@option{-fold-unroll-loops}. - @item -fprefetch-loop-arrays @opindex fprefetch-loop-arrays If supported by the target machine, generate instructions to prefetch diff --git a/gcc/doc/passes.texi b/gcc/doc/passes.texi index f7f38738c93..00a53978a7d 100644 --- a/gcc/doc/passes.texi +++ b/gcc/doc/passes.texi @@ -540,11 +540,8 @@ are in @file{lcm.c}. @item Loop optimization -This pass moves constant expressions out of loops, -and optionally does strength-reduction and loop unrolling as well. -Its source files are @file{loop.c} and @file{unroll.c}, plus the header -@file{loop.h} used for communication between them. Loop unrolling uses -some functions in @file{integrate.c} and the header @file{integrate.h}. +This pass moves constant expressions out of loops, and optionally does +strength-reduction as well. The pass is located in @file{loop.c}. Loop dependency analysis routines are contained in @file{dependence.c}. This pass is seriously out-of-date and is supposed to be replaced by a new one described below in near future. |