diff options
| -rw-r--r-- | gcc/ChangeLog | 10 | ||||
| -rw-r--r-- | gcc/doc/invoke.texi | 24 | ||||
| -rw-r--r-- | gcc/toplev.c | 5 |
3 files changed, 24 insertions, 15 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 14134e9..61256fe 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,13 @@ +2004-04-20 Paolo Bonzini <bonzini@gnu.org> + + Revert part of 2004-04-17 change that moved -frename-registers + to -O1. -frename-registers is buggy. + + * toplev.c (flag_rename_registers): Initialize to 0. + * doc/invoke.texi (Optimize options): Move -frename-registers + to "Not triggered by any -O level" section. Adjust commentary + accordingly. + 2004-04-20 Anil Paranjpe <anilp1@kpitcummins.com> * toplev.c (compile_file): Move targetm.asm_out.file_end call to end. diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 570e8e7..d204cf6 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -4342,19 +4342,6 @@ If @var{n} is not specified or is zero, use a machine-dependent default. Enabled at levels @option{-O2}, @option{-O3}. -@item -frename-registers -@opindex frename-registers -Attempt to avoid false dependencies in scheduled code by making use -of registers left over after register allocation. This optimization -will most benefit processors with lots of registers. Depending on the -debug information format adopted by the target, however, it can -make debugging impossible, since variables will no longer stay in -a ``home register''. - -Enabled at levels @option{-O}, @option{-O2}, @option{-O3}, @option{-Os}, -on targets where the default format for debugging information supports -variable tracking. - @item -fweb @opindex fweb Constructs webs as commonly used for register allocation purposes and assign @@ -4575,6 +4562,17 @@ using the knowledge about the value of the denominator. Enabled with @option{-profile-generate} and @option{-profile-use}. +@item -frename-registers +@opindex frename-registers +Attempt to avoid false dependencies in scheduled code by making use +of registers left over after register allocation. This optimization +will most benefit processors with lots of registers. Depending on the +debug information format adopted by the target, however, it can +make debugging impossible, since variables will no longer stay in +a ``home register''. + +Not enabled by default at any level because it has known bugs. + @item -fnew-ra @opindex fnew-ra Use a graph coloring register allocator. Currently this option is meant diff --git a/gcc/toplev.c b/gcc/toplev.c index bdffef7..d96543d 100644 --- a/gcc/toplev.c +++ b/gcc/toplev.c @@ -268,8 +268,9 @@ int flag_reorder_functions = 0; /* Nonzero if registers should be renamed. When flag_rename_registers == AUTODETECT_FLAG_VAR_TRACKING it will be set - according to optimize and default_debug_hooks in process_options (). */ -int flag_rename_registers = AUTODETECT_FLAG_VAR_TRACKING; + according to optimize and default_debug_hooks in process_options (), + but we do not do this yet because it triggers aborts in flow.c. */ +int flag_rename_registers = 0; int flag_cprop_registers = 0; /* Nonzero for -pedantic switch: warn about anything |