invoke.texi: Document -Ofast.
2010-05-25 Richard Guenther <rguenther@suse.de> * doc/invoke.texi: Document -Ofast. * target.h (struct gcc_target): Add handle_ofast. * target-def.h (TARGET_HANDLE_OFAST): Add. (TARGET_INITIALIZER): Adjust. * opts.c (decode_options): Handle -Ofast. Enable -ffast-math with it. * common.opt (Ofast): Add. From-SVN: r159815
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@ -1,3 +1,13 @@
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2010-05-25 Richard Guenther <rguenther@suse.de>
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* doc/invoke.texi: Document -Ofast.
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* target.h (struct gcc_target): Add handle_ofast.
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* target-def.h (TARGET_HANDLE_OFAST): Add.
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(TARGET_INITIALIZER): Adjust.
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* opts.c (decode_options): Handle -Ofast. Enable
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-ffast-math with it.
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* common.opt (Ofast): Add.
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2010-05-25 Paolo Bonzini <bonzini@gnu.org>
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* doc/tm.texi (STORE_FLAG_VALUE): Do not refer to sCC patterns.
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@ -69,6 +69,10 @@ Os
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Common Optimization
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Optimize for space rather than speed
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Ofast
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Common Optimization
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Optimize for speed disregarding exact standards compliance
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W
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Common RejectNegative Var(extra_warnings) Warning
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This switch is deprecated; use -Wextra instead
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@ -393,7 +393,7 @@ Objective-C and Objective-C++ Dialects}.
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-fvariable-expansion-in-unroller -fvect-cost-model -fvpt -fweb @gol
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-fwhole-program -fwhopr[=@var{n}] -fwpa -fuse-linker-plugin @gol
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--param @var{name}=@var{value}
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-O -O0 -O1 -O2 -O3 -Os}
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-O -O0 -O1 -O2 -O3 -Os -Ofast}
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@item Preprocessor Options
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@xref{Preprocessor Options,,Options Controlling the Preprocessor}.
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@ -5891,6 +5891,13 @@ optimizations designed to reduce code size.
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-falign-labels -freorder-blocks -freorder-blocks-and-partition @gol
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-fprefetch-loop-arrays -ftree-vect-loop-version}
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@item -Ofast
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@opindex Ofast
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Disregard strict standards compliance. @option{-Ofast} enables all
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@option{-O3} optimizations. It also enables optimizations that are not
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valid for all standard compliant programs.
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It turns on @option{-ffast-math}.
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If you use multiple @option{-O} options, with or without level numbers,
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the last such option is the one that is effective.
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@end table
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24
gcc/opts.c
24
gcc/opts.c
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@ -63,7 +63,7 @@ bool warn_larger_than;
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HOST_WIDE_INT larger_than_size;
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/* True to warn about any function whose frame size is larger
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* than N bytes. */
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than N bytes. */
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bool warn_frame_larger_than;
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HOST_WIDE_INT frame_larger_than_size;
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@ -804,6 +804,7 @@ decode_options (unsigned int argc, const char **argv)
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int opt2;
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int opt3;
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int opt1_max;
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int ofast = 0;
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if (first_time_p)
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{
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@ -831,6 +832,7 @@ decode_options (unsigned int argc, const char **argv)
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{
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optimize = 1;
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optimize_size = 0;
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ofast = 0;
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}
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else if (argv[i][0] == '-' && argv[i][1] == 'O')
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{
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@ -843,6 +845,14 @@ decode_options (unsigned int argc, const char **argv)
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/* Optimizing for size forces optimize to be 2. */
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optimize = 2;
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ofast = 0;
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}
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else if (strcmp (p, "fast") == 0)
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{
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/* -Ofast only adds flags to -O3. */
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optimize_size = 0;
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optimize = 3;
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ofast = 1;
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}
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else
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{
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@ -853,6 +863,7 @@ decode_options (unsigned int argc, const char **argv)
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if ((unsigned int) optimize > 255)
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optimize = 255;
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optimize_size = 0;
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ofast = 0;
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}
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}
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}
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@ -967,6 +978,17 @@ decode_options (unsigned int argc, const char **argv)
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else
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set_param_value ("min-crossjump-insns", initial_min_crossjump_insns);
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/* -Ofast adds optimizations to -O3. */
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if (ofast)
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{
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/* Which is -ffast-math for now. */
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set_fast_math_flags (1);
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/* Allow targets to enable extra options with -Ofast
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before general options processing so disabling them
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again afterwards works. */
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targetm.handle_ofast ();
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}
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/* Enable -Werror=coverage-mismatch by default */
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enable_warning_as_error("coverage-mismatch", 1, lang_mask);
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@ -431,6 +431,7 @@
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#define TARGET_OVERRIDE_OPTIONS_AFTER_CHANGE hook_void_void
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#define TARGET_HANDLE_OPTION hook_bool_size_t_constcharptr_int_true
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#define TARGET_HANDLE_OFAST hook_void_void
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#define TARGET_HELP NULL
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/* In except.c */
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TARGET_DEFAULT_TARGET_FLAGS, \
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TARGET_OVERRIDE_OPTIONS_AFTER_CHANGE, \
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TARGET_HANDLE_OPTION, \
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TARGET_HANDLE_OFAST, \
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TARGET_HELP, \
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TARGET_EH_RETURN_FILTER_MODE, \
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TARGET_LIBGCC_CMP_RETURN_MODE, \
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@ -531,6 +531,9 @@ struct gcc_target
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form was. Return true if the switch was valid. */
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bool (* handle_option) (size_t code, const char *arg, int value);
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/* Handle target-specific parts of specifying -Ofast. */
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void (* handle_ofast) (void);
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/* Display extra, target specific information in response to a
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--target-help switch. */
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void (* target_help) (void);
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