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| author | Richard Henderson <rth@redhat.com> | 2001-12-12 14:50:05 -0800 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 2001-12-12 14:50:05 -0800 |
| commit | 8582c27b18b4b930dc202ee851528377e2234348 (patch) | |
| tree | bbc23bebdd972d2b44a70bb56df71f814ddfbac5 /gcc/doc | |
| parent | de76a39c6e0550ed9cfc87a5e9d112f7f8dbefd7 (diff) | |
| download | gcc-8582c27b18b4b930dc202ee851528377e2234348.zip gcc-8582c27b18b4b930dc202ee851528377e2234348.tar.gz gcc-8582c27b18b4b930dc202ee851528377e2234348.tar.bz2 | |
regrename.c (copyprop_hardreg_forward): New optimization.
* regrename.c (copyprop_hardreg_forward): New optimization.
(kill_value_regno, kill_value, init_value_data, kill_clobbered_value,
kill_set_value, kill_autoinc_value, copy_value, find_oldest_value_reg,
replace_oldest_value_reg, replace_oldest_value_addr,
replace_oldest_value_mem, copyprop_hardreg_forward_1,
debug_value_data, validate_value_data): New.
* rtl.h (copyprop_hardreg_forward): Declare.
* toplev.c (flag_cprop_registers): New.
(f_options): Add -fcprop-registers
(rest_of_compilation): Invoke it.
(parse_options_and_default_flags): Set it at -O1.
* doc/invoke.texi: Document it.
From-SVN: r47951
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 66a0ddf..66314f1 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -259,7 +259,7 @@ in the following sections. @gccoptlist{ -falign-functions=@var{n} -falign-jumps=@var{n} @gol -falign-labels=@var{n} -falign-loops=@var{n} @gol --fbranch-probabilities -fcaller-saves @gol +-fbranch-probabilities -fcaller-saves -fcprop-registers @gol -fcse-follow-jumps -fcse-skip-blocks -fdata-sections @gol -fdelayed-branch -fdelete-null-pointer-checks @gol -fexpensive-optimizations -ffast-math -ffloat-store @gol @@ -3774,6 +3774,12 @@ will most benefit processors with lots of registers. It can, however, make debugging impossible, since variables will no longer stay in a ``home register''. +@item -fno-cprop-registers +@opindex fno-cprop-registers +After register allocation and post-register allocation instruction splitting, +we perform a copy-propagation pass to try to reduce scheduling dependencies +and occasionally eliminate the copy. + @item --param @var{name}=@var{value} @opindex param In some places, GCC uses various constants to control the amount of |