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Diffstat (limited to 'gcc/doc/invoke.texi')
| -rw-r--r-- | gcc/doc/invoke.texi | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index aed9010dc01..042982178bc 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -313,6 +313,7 @@ in the following sections. -funroll-all-loops -funroll-loops -fpeel-loops @gol -funswitch-loops -fold-unroll-loops -fold-unroll-all-loops @gol -ftree-pre -ftree-ccp -ftree-dce -ftree-loop-optimize @gol +-ftree-lim @gol -ftree-dominator-opts -ftree-dse -ftree-copyrename @gol -ftree-ch -ftree-sra -ftree-ter -ftree-lrs -ftree-fre @gol --param @var{name}=@var{value} @@ -4401,6 +4402,14 @@ usually increases code size. Perform loop optimizations on trees. This flag is enabled by default at -O and higher. +@item -ftree-lim +Perform loop invariant motion on trees. This pass moves only invartiants that +would be hard to handle on rtl level (function calls, operations that expand to +nontrivial sequences of insns). With @option{-funswitch-loops} it also moves +operands of conditions that are invariant out of the loop, so that we can use +just trivial invariantness analysis in loop unswitching. The pass also includes +store motion. + @item -ftree-sra Perform scalar replacement of aggregates. This pass replaces structure references with scalars to prevent committing structures to memory too @@ -5174,6 +5183,9 @@ The maximum number of insns of an unswitched loop. @item max-unswitch-level The maximum number of branches unswitched in a single loop. +@item lim-expensive +The minimum cost of an expensive expression in the loop invariant motion. + @item max-iterations-to-track The maximum number of iterations of a loop the brute force algorithm |