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| author | Alexandre Oliva <aoliva@redhat.com> | 2018-11-01 01:23:08 +0000 |
|---|---|---|
| committer | Alexandre Oliva <aoliva@gcc.gnu.org> | 2018-11-01 01:23:08 +0000 |
| commit | f4baf89f7c7cef908c23081f35b3f9fc226c0d12 (patch) | |
| tree | a7962616c7cc7c1826eff04a8931a5fbc1eb2986 | |
| parent | 8ff3295bc7c28972f06a7743e005599b82aacea9 (diff) | |
| download | gcc-f4baf89f7c7cef908c23081f35b3f9fc226c0d12.zip gcc-f4baf89f7c7cef908c23081f35b3f9fc226c0d12.tar.gz gcc-f4baf89f7c7cef908c23081f35b3f9fc226c0d12.tar.bz2 | |
gOlogy: skip dbranch at -Og
Delayed slot filling moves insns without any regard to variable
location notes, causing the location information in them to become
incorrect.
Fixing that appears to be quite difficult, but filling delay slots is
hardly an essential optimization to run at -Og, so if the user wants
to privilege debuggability, skip delay slot filling.
for gcc/ChangeLog
* opts.c (default_options_table): Do not enable
OPT_fdelayed_branch at -Og.
* doc/invoke.texi (-fdelayed-branch): Document it.
From-SVN: r265708
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/doc/invoke.texi | 3 | ||||
| -rw-r--r-- | gcc/opts.c | 2 |
3 files changed, 9 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 56e802e..234457a 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2018-10-31 Alexandre Oliva <aoliva@redhat.com> + + * opts.c (default_options_table): Do not enable + OPT_fdelayed_branch at -Og. + * doc/invoke.texi (-fdelayed-branch): Document it. + 2018-10-31 Richard Henderson <richard.henderson@linaro.org> * optabs-libfuncs.c (build_libfunc_function_visibility): diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 284594d..e290128 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -8595,7 +8595,8 @@ If supported for the target machine, attempt to reorder instructions to exploit instruction slots available after delayed branch instructions. -Enabled at levels @option{-O}, @option{-O2}, @option{-O3}, @option{-Os}. +Enabled at levels @option{-O}, @option{-O2}, @option{-O3}, @option{-Os}, +but not at @option{-Og}. @item -fschedule-insns @opindex fschedule-insns @@ -442,7 +442,7 @@ static const struct default_options default_options_table[] = /* -O1 optimizations. */ { OPT_LEVELS_1_PLUS, OPT_fdefer_pop, NULL, 1 }, #if DELAY_SLOTS - { OPT_LEVELS_1_PLUS, OPT_fdelayed_branch, NULL, 1 }, + { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fdelayed_branch, NULL, 1 }, #endif { OPT_LEVELS_1_PLUS, OPT_fguess_branch_probability, NULL, 1 }, { OPT_LEVELS_1_PLUS, OPT_fcprop_registers, NULL, 1 }, |