diff options
Diffstat (limited to 'gcc/doc/invoke.texi')
| -rw-r--r-- | gcc/doc/invoke.texi | 25 |
1 files changed, 14 insertions, 11 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 4aa4f52f0d6..6c9da5ebd25 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -365,12 +365,12 @@ Objective-C and Objective-C++ Dialects}. -freorder-blocks-and-partition -freorder-functions @gol -frerun-cse-after-loop -freschedule-modulo-scheduled-loops @gol -frounding-math -fsched2-use-superblocks @gol --fsched2-use-traces -fsched-spec-load -fsched-spec-load-dangerous @gol +-fsched2-use-traces -fsched-pressure @gol +-fsched-spec-load -fsched-spec-load-dangerous @gol -fsched-stalled-insns-dep[=@var{n}] -fsched-stalled-insns[=@var{n}] @gol -fsched-group-heuristic -fsched-critical-path-heuristic @gol --fsched-spec-insn-heuristic -fsched-reg-pressure-heuristic @gol --fsched-rank-heuristic -fsched-last-insn-heuristic @gol --fsched-dep-count-heuristic @gol +-fsched-spec-insn-heuristic -fsched-rank-heuristic @gol +-fsched-last-insn-heuristic -fsched-dep-count-heuristic @gol -fschedule-insns -fschedule-insns2 -fsection-anchors @gol -fselective-scheduling -fselective-scheduling2 @gol -fsel-sched-pipelining -fsel-sched-pipelining-outer-loops @gol @@ -6226,6 +6226,16 @@ Don't allow speculative motion of non-load instructions. This is normally enabled by default when scheduling before register allocation, i.e.@: with @option{-fschedule-insns} or at @option{-O2} or higher. +@item -fsched-pressure +@opindex fsched-pressure +Enable register pressure sensitive insn scheduling before the register +allocation. This only makes sense when scheduling before register +allocation is enabled, i.e.@: with @option{-fschedule-insns} or at +@option{-O2} or higher. Usage of this option can improve the +generated code and decrease its size by preventing register pressure +increase above the number of available hard registers and as a +consequence register spills in the register allocation. + @item -fsched-spec-load @opindex fsched-spec-load Allow speculative motion of some load instructions. This only makes @@ -6294,13 +6304,6 @@ This is enabled by default when scheduling is enabled, i.e.@: with @option{-fschedule-insns} or @option{-fschedule-insns2} or at @option{-O2} or higher. -@item -fsched-reg-pressure-heuristic -@opindex fsched-reg-pressure-heuristic -Enable the register pressure heuristic in the scheduler. This heuristic -favors the instruction with smaller contribution to register pressure. -This only makes sense when scheduling before register allocation, i.e.@: -with @option{-fschedule-insns} or at @option{-O2} or higher. - @item -fsched-rank-heuristic @opindex fsched-rank-heuristic Enable the rank heuristic in the scheduler. This heuristic favors |