-Wsign-compare -Wsign-conversion -Wstack-protector @gol
-Wstrict-aliasing -Wstrict-aliasing=n @gol
-Wstrict-overflow -Wstrict-overflow=@var{n} @gol
--Wsuggest-attribute=@r{[}const@r{|}pure@r{]} @gol
-Wswitch -Wswitch-default -Wswitch-enum -Wsync-nand @gol
-Wsystem-headers -Wtrigraphs -Wtype-limits -Wundef -Wuninitialized @gol
-Wunknown-pragmas -Wno-pragmas @gol
-finline-functions -finline-functions-called-once -finline-limit=@var{n} @gol
-finline-small-functions -fipa-cp -fipa-cp-clone -fipa-matrix-reorg -fipa-pta @gol
-fipa-profile -fipa-pure-const -fipa-reference -fipa-struct-reorg @gol
--fira-algorithm=@var{algorithm} @gol
+-fipa-type-escape -fira-algorithm=@var{algorithm} @gol
-fira-region=@var{region} -fira-coalesce @gol
-fira-loop-pressure -fno-ira-share-save-slots @gol
-fno-ira-share-spill-slots -fira-verbose=@var{n} @gol
@item -###
@opindex ###
-Like @option{-v} except the commands are not executed and arguments
-are quoted unless they contain only alphanumeric characters or @code{./-_}.
-This is useful for shell scripts to capture the driver-generated command lines.
+Like @option{-v} except the commands are not executed and all command
+arguments are quoted. This is useful for shell scripts to capture the
+driver-generated command lines.
@item -pipe
@opindex pipe
ANSI/ISO C@. These include @code{ffs}, @code{alloca}, @code{_exit},
@code{index}, @code{bzero}, @code{conjf}, and other related functions.
-@item -fnothrow-opt
-@opindex fnothrow-opt
-Treat a @code{throw()} exception specification as though it were a
-@code{noexcept} specification to reduce or eliminate the text size
-overhead relative to a function with no exception specification. The
-semantic effect is that an exception thrown out of a function with
-such an exception specification will result in a call to
-@code{terminate} rather than @code{unexpected}.
-
@item -fno-operator-names
@opindex fno-operator-names
Do not treat the operator name keywords @code{and}, @code{bitand},
Emit statistics about front-end processing at the end of the compilation.
This information is generally only useful to the G++ development team.
-@item -fstrict-enums
-@opindex fstrict-enums
-Allow the compiler to optimize using the assumption that a value of
-enumeration type can only be one of the values of the enumeration (as
-defined in the C++ standard; basically, a value which can be
-represented in the minimum number of bits needed to represent all the
-enumerators). This assumption may not be valid if the program uses a
-cast to convert an arbitrary integer value to the enumeration type.
-
@item -ftemplate-depth=@var{n}
@opindex ftemplate-depth
Set the maximum instantiation depth for template classes to @var{n}.
If a source file was changed between @option{-fprofile-gen} and
@option{-fprofile-use}, the files with the profile feedback can fail
to match the source file and GCC can not use the profile feedback
-information. By default, this warning is enabled and is treated as an
-error. @option{-Wno-coverage-mismatch} can be used to disable the
-warning or @option{-Wno-error=coverage-mismatch} can be used to
-disable the error. Disable the error for this warning can result in
-poorly optimized code, so disabling the error is useful only in the
-case of very minor changes such as bug fixes to an existing code-base.
-Completely disabling the warning is not recommended.
+information. By default, GCC emits an error message in this case.
+The option @option{-Wcoverage-mismatch} emits a warning instead of an
+error. GCC does not use appropriate feedback profiles, so using this
+option can result in poorly optimized code. This option is useful
+only in the case of very minor changes such as bug fixes to an
+existing code-base.
@end table
-Wc++0x-compat @gol
-Wchar-subscripts @gol
-Wenum-compare @r{(in C/Objc; this is on by default in C++)} @gol
--Wimplicit-int @r{(C and Objective-C only)} @gol
--Wimplicit-function-declaration @r{(C and Objective-C only)} @gol
+-Wimplicit-int @gol
+-Wimplicit-function-declaration @gol
-Wcomment @gol
-Wformat @gol
-Wmain @r{(only for C/ObjC and unless} @option{-ffreestanding}@r{)} @gol
@option{-pedantic-errors}. This warning is also enabled by
@option{-Wall}.
-@item -Wimplicit @r{(C and Objective-C only)}
+@item -Wimplicit
@opindex Wimplicit
@opindex Wno-implicit
Same as @option{-Wimplicit-int} and @option{-Wimplicit-function-declaration}.
false positives.
@end table
-@item -Wsuggest-attribute=@r{[}const@r{|}pure@r{]}
-@opindex Wsuggest-attribute=
-@opindex Wno-suggest-attribute=
-Warn for cases where adding an attribute may be beneficial. The
-attributes currently supported are listed below.
-
-@table @gcctabopt
-@item -Wsuggest-attribute=pure
-@itemx -Wsuggest-attribute=const
-@opindex Wsuggest-attribute=pure
-@opindex Wno-suggest-attribute=pure
-@opindex Wsuggest-attribute=const
-@opindex Wno-suggest-attribute=const
-
-Warn about functions which might be candidates for attributes
-@code{pure} or @code{const}. The compiler only warns for functions
-visible in other compilation units or if it cannot prove that the
-function returns normally. A function returns normally if it doesn't
-contain an infinite loop nor returns abnormally by throwing, calling
-@code{abort()} or trapping. This analysis requires option
-@option{-fipa-pure-const}, which is enabled by default at @option{-O}
-and higher. Higher optimization levels improve the accuracy of the
-analysis.
-@end table
-
@item -Warray-bounds
@opindex Wno-array-bounds
@opindex Warray-bounds
This option is only active when @option{-ftree-vrp} is active
-(default for @option{-O2} and above). It warns about subscripts to arrays
+(default for -O2 and above). It warns about subscripts to arrays
that are always out of bounds. This warning is enabled by @option{-Wall}.
@item -Wno-div-by-zero
layout in order to better utilize spatial locality. This transformation is
affective for programs containing arrays of structures. Available in two
compilation modes: profile-based (enabled with @option{-fprofile-generate})
-or static (which uses built-in heuristics). It works only in whole program
+or static (which uses built-in heuristics). Require @option{-fipa-type-escape}
+to provide the safety of this transformation. It works only in whole program
mode, so it requires @option{-fwhole-program} and @option{-combine} to be
enabled. Structures considered @samp{cold} by this transformation are not
affected (see @option{--param struct-reorg-cold-struct-ratio=@var{value}}).
compile-time usage on large compilation units. It is not enabled by
default at any optimization level.
+@item -fipa-profile
+@opindex fipa-profile
+Perform interprocedural profile propagation. The functions called only from
+cold functions are marked as cold. Also functions executed once (such as
+@code{cold}, @code{noreturn}, static constructors or destructors) are identified. Cold
+functions and loop less parts of functions executed once are then optimized for
+size.
+Enabled by default at @option{-O} and higher.
+
@item -fipa-cp
@opindex fipa-cp
Perform interprocedural constant propagation.
Disabled by default.
+This option is experimental.
+
@item -fwpa
@opindex fwpa
This is an internal option used by GCC when compiling with
@item min-insn-to-prefetch-ratio
The minimum ratio between the number of instructions and the
-number of prefetches to enable prefetching in a loop.
+number of prefetches to enable prefetching in a loop with an
+unknown trip count.
@item prefetch-min-insn-to-mem-ratio
The minimum ratio between the number of instructions and the
by default. This can be overridden with the @code{section} attribute.
@xref{Variable Attributes}.
+@item -mfix-cortex-m3-ldrd
+@opindex mfix-cortex-m3-ldrd
+Some Cortex-M3 cores can cause data corruption when @code{ldrd} instructions
+with overlapping destination and base registers are used. This option avoids
+generating these instructions. This option is enabled by default when
+@option{-mcpu=cortex-m3} is specified.
+
@end table
@node ARM Options
loader imposes this restriction, and when @option{-fpic} or @option{-fPIC}
is specified.
-@item -mfix-cortex-m3-ldrd
-@opindex mfix-cortex-m3-ldrd
-Some Cortex-M3 cores can cause data corruption when @code{ldrd} instructions
-with overlapping destination and base registers are used. This option avoids
-generating these instructions. This option is enabled by default when
-@option{-mcpu=cortex-m3} is specified.
-
@end table
@node AVR Options
dump_cgraph_node_set (stderr, set);
}
+/* Simple ipa profile pass propagating frequencies across the callgraph. */
+
+static unsigned int
+ipa_profile (void)
+{
+ struct cgraph_node **order = XCNEWVEC (struct cgraph_node *, cgraph_n_nodes);
+ struct cgraph_edge *e;
+ int order_pos;
+ bool something_changed = false;
+ int i;
+
+ order_pos = cgraph_postorder (order);
+ for (i = order_pos - 1; i >= 0; i--)
+ {
+ if (order[i]->local.local && cgraph_propagate_frequency (order[i]))
+ {
+ for (e = order[i]->callees; e; e = e->next_callee)
+ if (e->callee->local.local && !e->callee->aux)
+ {
+ something_changed = true;
+ e->callee->aux = (void *)1;
+ }
+ }
+ order[i]->aux = NULL;
+ }
+
+ while (something_changed)
+ {
+ something_changed = false;
+ for (i = order_pos - 1; i >= 0; i--)
+ {
+ if (order[i]->aux && cgraph_propagate_frequency (order[i]))
+ {
+ for (e = order[i]->callees; e; e = e->next_callee)
+ if (e->callee->local.local && !e->callee->aux)
+ {
+ something_changed = true;
+ e->callee->aux = (void *)1;
+ }
+ }
+ order[i]->aux = NULL;
+ }
+ }
+ free (order);
+ return 0;
+}
+
+static bool
+gate_ipa_profile (void)
+{
+ return flag_ipa_profile;
+}
+
+struct ipa_opt_pass_d pass_ipa_profile =
+{
+ {
+ IPA_PASS,
+ "ipa-profile", /* name */
+ gate_ipa_profile, /* gate */
+ ipa_profile, /* execute */
+ NULL, /* sub */
+ NULL, /* next */
+ 0, /* static_pass_number */
+ TV_IPA_PROFILE, /* tv_id */
+ 0, /* properties_required */
+ 0, /* properties_provided */
+ 0, /* properties_destroyed */
+ 0, /* todo_flags_start */
+ 0 /* todo_flags_finish */
+ },
+ NULL, /* generate_summary */
+ NULL, /* write_summary */
+ NULL, /* read_summary */
+ NULL, /* write_optimization_summary */
+ NULL, /* read_optimization_summary */
+ NULL, /* stmt_fixup */
+ 0, /* TODOs */
+ NULL, /* function_transform */
+ NULL /* variable_transform */
+};
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