diff options
Diffstat (limited to 'gcc/doc/invoke.texi')
| -rw-r--r-- | gcc/doc/invoke.texi | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 1d70843..510eda9 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -262,6 +262,7 @@ in the following sections. -fdump-tree-copyrename@r{[}-@var{n}@r{]} @gol -fdump-tree-nrv @gol -fdump-tree-sra@r{[}-@var{n}@r{]} @gol +-fdump-tree-fre@r{[}-@var{n}@r{]} @gol -feliminate-dwarf2-dups -feliminate-unused-debug-types @gol -feliminate-unused-debug-symbols -fmem-report -fprofile-arcs -ftree-based-profiling @gol -frandom-seed=@var{string} -fsched-verbose=@var{n} @gol @@ -313,7 +314,7 @@ in the following sections. -funswitch-loops -fold-unroll-loops -fold-unroll-all-loops @gol -ftree-pre -ftree-ccp -ftree-dce @gol -ftree-dominator-opts -ftree-dse -ftree-copyrename @gol --ftree-ch -ftree-sra -ftree-ter -ftree-lrs @gol +-ftree-ch -ftree-sra -ftree-ter -ftree-lrs -ftree-fre @gol --param @var{name}=@var{value} -O -O0 -O1 -O2 -O3 -Os} @@ -3553,6 +3554,11 @@ Dump each function after CCP. The file name is made by appending Dump trees after partial redundancy elimination. The file name is made by appending @file{.pre} to the source file name. +@item fre +@opindex fdump-tree-fre +Dump trees after full redundancy elimination. The file name is made +by appending @file{.fre} to the source file name. + @item dce @opindex fdump-tree-dce Dump each function after dead code elimination. The file name is made by @@ -4369,6 +4375,13 @@ Enabled at levels @option{-O2}, @option{-O3}, @option{-Os}. Perform Partial Redundancy Elimination (PRE) on trees. This flag is enabled by default at -O and higher. +@item -ftree-fre +Perform Full Redundancy Elimination (FRE) on trees. The difference +between FRE and PRE is that FRE only considers expressions +that are computed on all paths leading to the redundant computation. +This analysis faster than PRE, though it exposes fewer redundancies. +This flag is enabled by default at -O and higher. + @item -ftree-ccp Perform sparse conditional constant propagation (CCP) on trees. This flag is enabled by default at -O and higher. |