* gcc.texi: Add info on regmove pass

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@26160 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 12 insertions, 0 deletions

diff --git a/gcc/gcc.texi b/gcc/gcc.texi
index 4f9ceeb4ea8..16828160c32 100644
--- a/gcc/gcc.texi
+++ b/gcc/gcc.texi
@@ -3458,6 +3458,18 @@ The option @samp{-dc} causes a debugging dump of the RTL code after
 this pass.  This dump file's name is made by appending @samp{.combine}
 to the input file name.
 
+@cindex register movement
+@item
+Register movement (@file{regmove.c}). This pass looks for cases where
+matching constraints would force an instruction to need a reload, and
+this reload would be a register to register move.  It them attempts
+to change the registers used by the instruction to avoid the move
+instruction.
+
+The option @samp{-dN} causes a debugging dump of the RTL code after
+this pass.  This dump file's name is made by appending @samp{.regmove}
+to the input file name.
+
 @cindex instruction scheduling
 @cindex scheduling, instruction
 @item