diff options
Diffstat (limited to 'gcc/doc/invoke.texi')
| -rw-r--r-- | gcc/doc/invoke.texi | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 027ce96..cd82544 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -343,6 +343,7 @@ Objective-C and Objective-C++ Dialects}. -fdump-tree-dse@r{[}-@var{n}@r{]} @gol -fdump-tree-phiprop@r{[}-@var{n}@r{]} @gol -fdump-tree-phiopt@r{[}-@var{n}@r{]} @gol +-fdump-tree-backprop@r{[}-@var{n}@r{]} @gol -fdump-tree-forwprop@r{[}-@var{n}@r{]} @gol -fdump-tree-nrv -fdump-tree-vect @gol -fdump-tree-sink @gol @@ -443,9 +444,9 @@ Objective-C and Objective-C++ Dialects}. -fschedule-insns -fschedule-insns2 -fsection-anchors @gol -fselective-scheduling -fselective-scheduling2 @gol -fsel-sched-pipelining -fsel-sched-pipelining-outer-loops @gol --fsemantic-interposition @gol --fshrink-wrap -fsignaling-nans -fsingle-precision-constant @gol --fsplit-ivs-in-unroller -fsplit-wide-types -fssa-phiopt @gol +-fsemantic-interposition -fshrink-wrap -fsignaling-nans @gol +-fsingle-precision-constant -fsplit-ivs-in-unroller @gol +-fsplit-wide-types -fssa-backprop -fssa-phiopt @gol -fstack-protector -fstack-protector-all -fstack-protector-strong @gol -fstack-protector-explicit -fstdarg-opt -fstrict-aliasing @gol -fstrict-overflow -fthread-jumps -ftracer -ftree-bit-ccp @gol @@ -7236,6 +7237,12 @@ name is made by appending @file{.dse} to the source file name. Dump each function after optimizing PHI nodes into straightline code. The file name is made by appending @file{.phiopt} to the source file name. +@item backprop +@opindex fdump-tree-backprop +Dump each function after back-propagating use information up the definition +chain. The file name is made by appending @file{.backprop} to the +source file name. + @item forwprop @opindex fdump-tree-forwprop Dump each function after forward propagating single use variables. The file @@ -7707,9 +7714,10 @@ compilation time. -freorder-blocks @gol -fshrink-wrap @gol -fsplit-wide-types @gol +-fssa-backprop @gol +-fssa-phiopt @gol -ftree-bit-ccp @gol -ftree-ccp @gol --fssa-phiopt @gol -ftree-ch @gol -ftree-coalesce-vars @gol -ftree-copy-prop @gol @@ -8795,6 +8803,13 @@ Perform sparse conditional constant propagation (CCP) on trees. This pass only operates on local scalar variables and is enabled by default at @option{-O} and higher. +@item -fssa-backprop +@opindex fssa-backprop +Propagate information about uses of a value up the definition chain +in order to simplify the definitions. For example, this pass strips +sign operations if the sign of a value never matters. The flag is +enabled by default at @option{-O} and higher. + @item -fssa-phiopt @opindex fssa-phiopt Perform pattern matching on SSA PHI nodes to optimize conditional |