diff options
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 8 | ||||
| -rw-r--r-- | gcc/doc/passes.texi | 9 |
2 files changed, 15 insertions, 2 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index eadf22a3591..0da40754606 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -316,7 +316,7 @@ Objective-C and Objective-C++ Dialects}. -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-lim -fivcanon @gol -ftree-dominator-opts -ftree-dse -ftree-copyrename @gol -ftree-ch -ftree-sra -ftree-ter -ftree-lrs -ftree-fre -ftree-vectorize @gol --param @var{name}=@var{value} @@ -4483,6 +4483,12 @@ 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 -fivcanon +Create a canonical counter for number of iterations in the loop for that +determining number of iterations requires complicated analysis. Later +optimizations then may determine the number easily. Useful especially +in connection with unrolling. + @item -ftree-sra Perform scalar replacement of aggregates. This pass replaces structure references with scalars to prevent committing structures to memory too diff --git a/gcc/doc/passes.texi b/gcc/doc/passes.texi index 9867e7323ef..9af3659c986 100644 --- a/gcc/doc/passes.texi +++ b/gcc/doc/passes.texi @@ -375,8 +375,15 @@ 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. The pass is implemented in @file{tree-ssa-loop-im.c}. +Canonical induction variable creation. This pass creates a simple counter +for number of iterations of the loop and replaces the exit condition of the +loop using it, in case when a complicated analysis is necessary to determine +the number of iterations. Later optimizations then may determine the number +easily. The pass is implemented in @file{tree-ssa-loop-ivcanon.c}. + The optimizations also use various utility functions contained in -@file{cfgloop.c}, @file{cfgloopanal.c} and @file{cfgloopmanip.c}. +@file{tree-ssa-loop-manip.c}, @file{cfgloop.c}, @file{cfgloopanal.c} and +@file{cfgloopmanip.c}. @item Conditional constant propagation |