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-rw-r--r--gcc/doc/invoke.texi12
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