2006-11-03 Paolo Bonzini <bonzini@gnu.org>

[pf3gnuchains/gcc-fork.git] / gcc / doc / invoke.texi

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 5bbbfc5..2e0de41 100644 (file)
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -310,7 +310,7 @@ Objective-C and Objective-C++ Dialects}.
 -fcse-skip-blocks  -fcx-limited-range  -fdata-sections @gol
 -fdelayed-branch  -fdelete-null-pointer-checks -fearly-inlining @gol
 -fexpensive-optimizations  -ffast-math  -ffloat-store @gol
--fforce-addr  -ffunction-sections @gol
+-fforce-addr  -fforward-propagate  -ffunction-sections @gol
 -fgcse  -fgcse-lm  -fgcse-sm  -fgcse-las  -fgcse-after-reload @gol
 -fcrossjumping  -fif-conversion  -fif-conversion2 @gol
 -finline-functions  -finline-functions-called-once @gol
@@ -4621,6 +4621,16 @@ register-load. This option is now a nop and will be removed in 4.2.
 Force memory address constants to be copied into registers before
 doing arithmetic on them.
 
+@item -fforward-propagate
+@opindex fforward-propagate
+Perform a forward propagation pass on RTL.  The pass tries to combine two
+instructions and checks if the result can be simplified.  If loop unrolling
+is active, two passes are performed and the second is scheduled after
+loop unrolling.
+
+This option is enabled by default at optimization levels @option{-O2},
+@option{-O3}, @option{-Os}.
+
 @item -fomit-frame-pointer
 @opindex fomit-frame-pointer
 Don't keep the frame pointer in a register for functions that