mirror of git://gcc.gnu.org/git/gcc.git
re PR middle-end/65703 (-fdefer-pop documentation is confusing)
2018-11-10 Sandra Loosemore <sandra@codesourcery.com> PR middle-end/65703 gcc/ * doc/invoke.texi (Optimize Options): Add @opindex entries for the positive forms of -fno-xxx and -mno-xxx options that were lacking them. From-SVN: r266008
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Sandra Loosemore
Sandra Loosemore
parent
9b20345393
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47d591cf00
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@ -1,3 +1,10 @@
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2018-11-10 Sandra Loosemore <sandra@codesourcery.com>
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PR middle-end/65703
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* doc/invoke.texi (Optimize Options): Add @opindex entries
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for the positive forms of -fno-xxx and -mno-xxx options
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that were lacking them.
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2018-11-10 Segher Boessenkool <segher@kernel.crashing.org>
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* combine.c (make_more_copies): Only make an intermediate copy if the
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@ -2101,6 +2101,7 @@ supported for C as this construct is allowed by C++.
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@item -fno-asm
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@opindex fno-asm
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@opindex fasm
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Do not recognize @code{asm}, @code{inline} or @code{typeof} as a
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keyword, so that code can use these words as identifiers. You can use
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the keywords @code{__asm__}, @code{__inline__} and @code{__typeof__}
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@ -2116,6 +2117,7 @@ switch only affects the @code{asm} and @code{typeof} keywords, since
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@item -fno-builtin
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@itemx -fno-builtin-@var{function}
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@opindex fno-builtin
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@opindex fbuiltin
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@cindex built-in functions
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Don't recognize built-in functions that do not begin with
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@samp{__builtin_} as prefix. @xref{Other Builtins,,Other built-in
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@ -2439,6 +2441,7 @@ option is used for the warning.
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@item -fno-access-control
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@opindex fno-access-control
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@opindex faccess-control
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Turn off all access checking. This switch is mainly useful for working
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around bugs in the access control code.
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@ -2512,6 +2515,7 @@ deprecated, and may be removed in a future version of G++.
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@item -fno-elide-constructors
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@opindex fno-elide-constructors
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@opindex felide-constructors
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The C++ standard allows an implementation to omit creating a temporary
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that is only used to initialize another object of the same type.
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Specifying this option disables that optimization, and forces G++ to
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@ -2523,6 +2527,7 @@ option still affects trivial member functions.
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@item -fno-enforce-eh-specs
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@opindex fno-enforce-eh-specs
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@opindex fenforce-eh-specs
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Don't generate code to check for violation of exception specifications
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at run time. This option violates the C++ standard, but may be useful
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for reducing code size in production builds, much like defining
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@ -2556,6 +2561,7 @@ aliases, the default is @option{-fno-extern-tls-init}.
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@item -fno-gnu-keywords
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@opindex fno-gnu-keywords
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@opindex fgnu-keywords
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Do not recognize @code{typeof} as a keyword, so that code can use this
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word as an identifier. You can use the keyword @code{__typeof__} instead.
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This option is implied by the strict ISO C++ dialects: @option{-ansi},
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@ -2563,18 +2569,21 @@ This option is implied by the strict ISO C++ dialects: @option{-ansi},
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@item -fno-implicit-templates
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@opindex fno-implicit-templates
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@opindex fimplicit-templates
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Never emit code for non-inline templates that are instantiated
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implicitly (i.e.@: by use); only emit code for explicit instantiations.
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@xref{Template Instantiation}, for more information.
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@item -fno-implicit-inline-templates
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@opindex fno-implicit-inline-templates
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@opindex fimplicit-inline-templates
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Don't emit code for implicit instantiations of inline templates, either.
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The default is to handle inlines differently so that compiles with and
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without optimization need the same set of explicit instantiations.
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@item -fno-implement-inlines
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@opindex fno-implement-inlines
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@opindex fimplement-inlines
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To save space, do not emit out-of-line copies of inline functions
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controlled by @code{#pragma implementation}. This causes linker
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errors if these functions are not inlined everywhere they are called.
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@ -2601,6 +2610,7 @@ with fewer template parameters. This flag is enabled by default for
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@item -fno-nonansi-builtins
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@opindex fno-nonansi-builtins
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@opindex fnonansi-builtins
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Disable built-in declarations of functions that are not mandated by
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ANSI/ISO C@. These include @code{ffs}, @code{alloca}, @code{_exit},
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@code{index}, @code{bzero}, @code{conjf}, and other related functions.
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@ -2619,12 +2629,14 @@ to @code{terminate} rather than @code{unexpected}.
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@item -fno-operator-names
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@opindex fno-operator-names
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@opindex foperator-names
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Do not treat the operator name keywords @code{and}, @code{bitand},
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@code{bitor}, @code{compl}, @code{not}, @code{or} and @code{xor} as
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synonyms as keywords.
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@item -fno-optional-diags
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@opindex fno-optional-diags
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@opindex foptional-diags
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Disable diagnostics that the standard says a compiler does not need to
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issue. Currently, the only such diagnostic issued by G++ is the one for
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a name having multiple meanings within a class.
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@ -2637,6 +2649,7 @@ nonconforming code to compile.
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@item -fno-pretty-templates
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@opindex fno-pretty-templates
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@opindex fpretty-templates
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When an error message refers to a specialization of a function
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template, the compiler normally prints the signature of the
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template followed by the template arguments and any typedefs or
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@ -2656,6 +2669,7 @@ Instantiation}, for more information.
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@item -fno-rtti
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@opindex fno-rtti
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@opindex frtti
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Disable generation of information about every class with virtual
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functions for use by the C++ run-time type identification features
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(@code{dynamic_cast} and @code{typeid}). If you don't use those parts
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@ -2712,6 +2726,7 @@ can run out of stack space before hitting 1024 in some situations.
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@item -fno-threadsafe-statics
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@opindex fno-threadsafe-statics
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@opindex fthreadsafe-statics
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Do not emit the extra code to use the routines specified in the C++
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ABI for thread-safe initialization of local statics. You can use this
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option to reduce code size slightly in code that doesn't need to be
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@ -2727,6 +2742,7 @@ destructors, but only works if your C library supports
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@item -fno-use-cxa-get-exception-ptr
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@opindex fno-use-cxa-get-exception-ptr
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@opindex fuse-cxa-get-exception-ptr
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Don't use the @code{__cxa_get_exception_ptr} runtime routine. This
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causes @code{std::uncaught_exception} to be incorrect, but is necessary
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if the runtime routine is not available.
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@ -2795,6 +2811,7 @@ violation of the ODR to define types with the same name differently.
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@item -fno-weak
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@opindex fno-weak
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@opindex fweak
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Do not use weak symbol support, even if it is provided by the linker.
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By default, G++ uses weak symbols if they are available. This
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option exists only for testing, and should not be used by end-users;
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@ -3461,6 +3478,7 @@ used.
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@item -fno-nil-receivers
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@opindex fno-nil-receivers
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@opindex fnil-receivers
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Assume that all Objective-C message dispatches (@code{[receiver
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message:arg]}) in this translation unit ensure that the receiver is
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not @code{nil}. This allows for more efficient entry points in the
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@ -3950,6 +3968,7 @@ This flag also affects the output of the
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@item -fno-show-column
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@opindex fno-show-column
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@opindex fshow-column
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Do not print column numbers in diagnostics. This may be necessary if
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diagnostics are being scanned by a program that does not understand the
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column numbers, such as @command{dejagnu}.
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@ -8062,6 +8081,7 @@ optimizations to be performed is desired.
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@table @gcctabopt
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@item -fno-defer-pop
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@opindex fno-defer-pop
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@opindex fdefer-pop
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For machines that must pop arguments after a function call, always pop
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the arguments as soon as each function returns.
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At levels @option{-O1} and higher, @option{-fdefer-pop} is the default;
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@ -8121,6 +8141,7 @@ Enabled at levels @option{-O2}, @option{-O3}.
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@item -fno-inline
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@opindex fno-inline
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@opindex finline
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Do not expand any functions inline apart from those marked with
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the @code{always_inline} attribute. This is the default when not
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optimizing.
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@ -8217,6 +8238,7 @@ release to an another.
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@item -fno-keep-inline-dllexport
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@opindex fno-keep-inline-dllexport
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@opindex fkeep-inline-dllexport
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This is a more fine-grained version of @option{-fkeep-inline-functions},
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which applies only to functions that are declared using the @code{dllexport}
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attribute or declspec. @xref{Function Attributes,,Declaring Attributes of
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@ -8283,6 +8305,7 @@ life-range analysis. This option is effective only with
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@item -fno-branch-count-reg
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@opindex fno-branch-count-reg
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@opindex fbranch-count-reg
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Disable the optimization pass that scans for opportunities to use
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``decrement and branch'' instructions on a count register instead of
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instruction sequences that decrement a register, compare it against zero, and
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@ -8296,6 +8319,7 @@ The default is @option{-fbranch-count-reg} at @option{-O1} and higher.
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@item -fno-function-cse
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@opindex fno-function-cse
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@opindex ffunction-cse
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Do not put function addresses in registers; make each instruction that
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calls a constant function contain the function's address explicitly.
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@ -8307,6 +8331,7 @@ The default is @option{-ffunction-cse}
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@item -fno-zero-initialized-in-bss
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@opindex fno-zero-initialized-in-bss
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@opindex fzero-initialized-in-bss
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If the target supports a BSS section, GCC by default puts variables that
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are initialized to zero into BSS@. This can save space in the resulting
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code.
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@ -8543,6 +8568,7 @@ Enabled for Alpha, AArch64 and x86 at levels @option{-O2},
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@item -fno-lifetime-dse
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@opindex fno-lifetime-dse
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@opindex flifetime-dse
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In C++ the value of an object is only affected by changes within its
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lifetime: when the constructor begins, the object has an indeterminate
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value, and any changes during the lifetime of the object are dead when
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@ -8616,6 +8642,7 @@ This option is enabled at level @option{-O3} for some targets.
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@item -fno-ira-share-save-slots
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@opindex fno-ira-share-save-slots
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@opindex fira-share-save-slots
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Disable sharing of stack slots used for saving call-used hard
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registers living through a call. Each hard register gets a
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separate stack slot, and as a result function stack frames are
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@ -8623,6 +8650,7 @@ larger.
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@item -fno-ira-share-spill-slots
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@opindex fno-ira-share-spill-slots
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@opindex fira-share-spill-slots
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Disable sharing of stack slots allocated for pseudo-registers. Each
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pseudo-register that does not get a hard register gets a separate
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stack slot, and as a result function stack frames are larger.
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@ -8665,12 +8693,14 @@ Enabled at levels @option{-O2}, @option{-O3}, @option{-Os}.
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@item -fno-sched-interblock
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@opindex fno-sched-interblock
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@opindex fsched-interblock
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Disable instruction scheduling across basic blocks, which
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is normally enabled when scheduling before register allocation, i.e.@:
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with @option{-fschedule-insns} or at @option{-O2} or higher.
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@item -fno-sched-spec
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@opindex fno-sched-spec
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@opindex fsched-spec
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Disable speculative motion of non-load instructions, which
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is normally enabled when scheduling before register allocation, i.e.@:
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with @option{-fschedule-insns} or at @option{-O2} or higher.
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@ -9405,6 +9435,7 @@ Disabled at level @option{-Os}.
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@item -fno-printf-return-value
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@opindex fno-printf-return-value
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@opindex fprintf-return-value
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Do not substitute constants for known return value of formatted output
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functions such as @code{sprintf}, @code{snprintf}, @code{vsprintf}, and
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@code{vsnprintf} (but not @code{printf} of @code{fprintf}). This
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@ -9431,7 +9462,9 @@ options. The @option{-fprintf-return-value} option is enabled by default.
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@item -fno-peephole
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@itemx -fno-peephole2
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@opindex fno-peephole
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@opindex fpeephole
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@opindex fno-peephole2
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@opindex fpeephole2
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Disable any machine-specific peephole optimizations. The difference
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between @option{-fno-peephole} and @option{-fno-peephole2} is in how they
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are implemented in the compiler; some targets use one, some use the
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@ -9442,6 +9475,7 @@ other, a few use both.
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@item -fno-guess-branch-probability
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@opindex fno-guess-branch-probability
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@opindex fguess-branch-probability
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Do not guess branch probabilities using heuristics.
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GCC uses heuristics to guess branch probabilities if they are
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@ -9674,6 +9708,7 @@ Enabled by default.
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@item -fno-toplevel-reorder
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@opindex fno-toplevel-reorder
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@opindex ftoplevel-reorder
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Do not reorder top-level functions, variables, and @code{asm}
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statements. Output them in the same order that they appear in the
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input file. When this option is used, unreferenced static variables
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@ -10134,6 +10169,7 @@ that do not require the guarantees of these specifications.
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@item -fno-math-errno
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@opindex fno-math-errno
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@opindex fmath-errno
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Do not set @code{errno} after calling math functions that are executed
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with a single instruction, e.g., @code{sqrt}. A program that relies on
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IEEE exceptions for math error handling may want to use this flag
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@ -10214,6 +10250,7 @@ The default is @option{-fno-finite-math-only}.
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@item -fno-signed-zeros
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@opindex fno-signed-zeros
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@opindex fsigned-zeros
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Allow optimizations for floating-point arithmetic that ignore the
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signedness of zero. IEEE arithmetic specifies the behavior of
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distinct +0.0 and @minus{}0.0 values, which then prohibits simplification
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@ -10224,6 +10261,7 @@ The default is @option{-fsigned-zeros}.
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@item -fno-trapping-math
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@opindex fno-trapping-math
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@opindex ftrapping-math
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Compile code assuming that floating-point operations cannot generate
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user-visible traps. These traps include division by zero, overflow,
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underflow, inexact result and invalid operation. This option requires
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@ -10274,6 +10312,7 @@ disable all GCC optimizations that affect signaling NaN behavior.
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@item -fno-fp-int-builtin-inexact
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@opindex fno-fp-int-builtin-inexact
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@opindex ffp-int-builtin-inexact
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Do not allow the built-in functions @code{ceil}, @code{floor},
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@code{round} and @code{trunc}, and their @code{float} and @code{long
|
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double} variants, to generate code that raises the ``inexact''
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@ -13253,6 +13292,7 @@ unwinding from asynchronous events (such as debugger or garbage collector).
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@item -fno-gnu-unique
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@opindex fno-gnu-unique
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@opindex fgnu-unique
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On systems with recent GNU assembler and C library, the C++ compiler
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uses the @code{STB_GNU_UNIQUE} binding to make sure that definitions
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of template static data members and static local variables in inline
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|
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@ -13324,6 +13364,7 @@ Use it to conform to a non-default application binary interface.
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@item -fno-common
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@opindex fno-common
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@opindex fcommon
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@cindex tentative definitions
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In C code, this option controls the placement of global variables
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defined without an initializer, known as @dfn{tentative definitions}
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|
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@ -13353,6 +13394,7 @@ variable definitions this way.
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@item -fno-ident
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@opindex fno-ident
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@opindex fident
|
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Ignore the @code{#ident} directive.
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|
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@item -finhibit-size-directive
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|
|
@ -13521,6 +13563,7 @@ for @option{-fpie} and 2 for @option{-fPIE}.
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|
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@item -fno-plt
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@opindex fno-plt
|
||||
@opindex fplt
|
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Do not use the PLT for external function calls in position-independent code.
|
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Instead, load the callee address at call sites from the GOT and branch to it.
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This leads to more efficient code by eliminating PLT stubs and exposing
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@ -13538,6 +13581,7 @@ functions that are marked to not use the PLT to use the GOT instead.
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@item -fno-jump-tables
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@opindex fno-jump-tables
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@opindex fjump-tables
|
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Do not use jump tables for switch statements even where it would be
|
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more efficient than other code generation strategies. This option is
|
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of use in conjunction with @option{-fpic} or @option{-fPIC} for
|
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|
|
@ -15429,6 +15473,7 @@ Emit @var{num} NOPs before every other generated instruction.
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@item -mno-soft-cmpsf
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@opindex mno-soft-cmpsf
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@opindex msoft-cmpsf
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For single-precision floating-point comparisons, emit an @code{fsub} instruction
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and test the flags. This is faster than a software comparison, but can
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get incorrect results in the presence of NaNs, or when two different small
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|
|
@ -15452,6 +15497,7 @@ toolchain with the appropriate @option{--with-stack-offset=@var{num}} option.
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@item -mno-round-nearest
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@opindex mno-round-nearest
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@opindex mround-nearest
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||||
Make the scheduler assume that the rounding mode has been set to
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truncating. The default is @option{-mround-nearest}.
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|
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|
|
@ -15511,12 +15557,15 @@ integer multiply, or integer multiply-and-accumulate.
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The default is @option{-mfp-mode=caller}
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@item -mnosplit-lohi
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@item -mno-split-lohi
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@itemx -mno-postinc
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@itemx -mno-postmodify
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@opindex mnosplit-lohi
|
||||
@opindex mno-split-lohi
|
||||
@opindex msplit-lohi
|
||||
@opindex mno-postinc
|
||||
@opindex mpostinc
|
||||
@opindex mno-postmodify
|
||||
@opindex mpostmodify
|
||||
Code generation tweaks that disable, respectively, splitting of 32-bit
|
||||
loads, generation of post-increment addresses, and generation of
|
||||
post-modify addresses. The defaults are @option{msplit-lohi},
|
||||
|
|
@ -15524,6 +15573,7 @@ post-modify addresses. The defaults are @option{msplit-lohi},
|
|||
|
||||
@item -mnovect-double
|
||||
@opindex mno-vect-double
|
||||
@opindex mvect-double
|
||||
Change the preferred SIMD mode to SImode. The default is
|
||||
@option{-mvect-double}, which uses DImode as preferred SIMD mode.
|
||||
|
||||
|
|
@ -15687,6 +15737,7 @@ supported. This is always enabled for @option{-mcpu=ARC700}.
|
|||
|
||||
@item -mno-mpy
|
||||
@opindex mno-mpy
|
||||
@opindex mmpy
|
||||
Do not generate @code{mpy}-family instructions for ARC700. This option is
|
||||
deprecated.
|
||||
|
||||
|
|
@ -16055,6 +16106,7 @@ load/store operations.
|
|||
|
||||
@item -mno-sdata
|
||||
@opindex mno-sdata
|
||||
@opindex msdata
|
||||
Do not generate sdata references. This is the default for tool chains
|
||||
built for @w{@code{arc-linux-uclibc}} and @w{@code{arceb-linux-uclibc}}
|
||||
targets.
|
||||
|
|
@ -16066,6 +16118,7 @@ default.
|
|||
|
||||
@item -mno-volatile-cache
|
||||
@opindex mno-volatile-cache
|
||||
@opindex mvolatile-cache
|
||||
Enable cache bypass for volatile references.
|
||||
|
||||
@end table
|
||||
|
|
@ -16382,6 +16435,7 @@ configurations this option is meaningless.
|
|||
|
||||
@item -mno-sched-prolog
|
||||
@opindex mno-sched-prolog
|
||||
@opindex msched-prolog
|
||||
Prevent the reordering of instructions in the function prologue, or the
|
||||
merging of those instruction with the instructions in the function's
|
||||
body. This means that all functions start with a recognizable set
|
||||
|
|
@ -17775,6 +17829,7 @@ contain speculative loads after jump instructions. If this option is used,
|
|||
|
||||
@item -mno-specld-anomaly
|
||||
@opindex mno-specld-anomaly
|
||||
@opindex mspecld-anomaly
|
||||
Don't generate extra code to prevent speculative loads from occurring.
|
||||
|
||||
@item -mcsync-anomaly
|
||||
|
|
@ -17785,16 +17840,17 @@ If this option is used, @code{__WORKAROUND_SPECULATIVE_SYNCS} is defined.
|
|||
|
||||
@item -mno-csync-anomaly
|
||||
@opindex mno-csync-anomaly
|
||||
@opindex mcsync-anomaly
|
||||
Don't generate extra code to prevent CSYNC or SSYNC instructions from
|
||||
occurring too soon after a conditional branch.
|
||||
|
||||
@item -mlow-64k
|
||||
@opindex mlow-64k
|
||||
@item -mlow64k
|
||||
@opindex mlow64k
|
||||
When enabled, the compiler is free to take advantage of the knowledge that
|
||||
the entire program fits into the low 64k of memory.
|
||||
|
||||
@item -mno-low-64k
|
||||
@opindex mno-low-64k
|
||||
@item -mno-low64k
|
||||
@opindex mno-low64k
|
||||
Assume that the program is arbitrarily large. This is the default.
|
||||
|
||||
@item -mstack-check-l1
|
||||
|
|
@ -17811,6 +17867,7 @@ With a @samp{bfin-elf} target, this option implies @option{-msim}.
|
|||
|
||||
@item -mno-id-shared-library
|
||||
@opindex mno-id-shared-library
|
||||
@opindex mid-shared-library
|
||||
Generate code that doesn't assume ID-based shared libraries are being used.
|
||||
This is the default.
|
||||
|
||||
|
|
@ -17823,6 +17880,7 @@ and calls.
|
|||
|
||||
@item -mno-leaf-id-shared-library
|
||||
@opindex mno-leaf-id-shared-library
|
||||
@opindex mleaf-id-shared-library
|
||||
Do not assume that the code being compiled won't link against any ID shared
|
||||
libraries. Slower code is generated for jump and call insns.
|
||||
|
||||
|
|
@ -17842,6 +17900,7 @@ against the text section.
|
|||
|
||||
@item -mno-sep-data
|
||||
@opindex mno-sep-data
|
||||
@opindex msep-data
|
||||
Generate code that assumes that the data segment follows the text segment.
|
||||
This is the default.
|
||||
|
||||
|
|
@ -18022,6 +18081,7 @@ compare and test instructions before use of condition codes.
|
|||
|
||||
@item -mno-side-effects
|
||||
@opindex mno-side-effects
|
||||
@opindex mside-effects
|
||||
Do not emit instructions with side effects in addressing modes other than
|
||||
post-increment.
|
||||
|
||||
|
|
@ -19037,6 +19097,7 @@ Change ABI to use double word insns.
|
|||
|
||||
@item -mno-dword
|
||||
@opindex mno-dword
|
||||
@opindex mdword
|
||||
|
||||
Do not use double word instructions.
|
||||
|
||||
|
|
@ -19278,6 +19339,7 @@ compiler-generated code. It is enabled by default.
|
|||
|
||||
@item -mno-optimize-membar
|
||||
@opindex mno-optimize-membar
|
||||
@opindex moptimize-membar
|
||||
|
||||
This switch disables the automatic removal of redundant @code{membar}
|
||||
instructions from the generated code.
|
||||
|
|
@ -19384,6 +19446,7 @@ This option is valid only for H8S targets.
|
|||
|
||||
@item -mno-exr
|
||||
@opindex mno-exr
|
||||
@opindex mexr
|
||||
Extended registers are not stored on stack before execution of function
|
||||
with monitor attribute. Default option is @option{-mno-exr}.
|
||||
This option is valid only for H8S targets.
|
||||
|
|
@ -19452,6 +19515,7 @@ rather obscure problems when compiling MIG generated code under MACH@.
|
|||
|
||||
@item -mno-space-regs
|
||||
@opindex mno-space-regs
|
||||
@opindex mspace-regs
|
||||
Generate code that assumes the target has no space registers. This allows
|
||||
GCC to generate faster indirect calls and use unscaled index address modes.
|
||||
|
||||
|
|
@ -19555,6 +19619,7 @@ HP-UX GCC, i.e.@: configured with @samp{hppa*64*-*-hpux*}.
|
|||
|
||||
@item -mlong-calls
|
||||
@opindex mno-long-calls
|
||||
@opindex mlong-calls
|
||||
Generate code that uses long call sequences. This ensures that a call
|
||||
is always able to reach linker generated stubs. The default is to generate
|
||||
long calls only when the distance from the call site to the beginning
|
||||
|
|
@ -19726,6 +19791,7 @@ using the maximum throughput algorithm.
|
|||
|
||||
@item -mno-inline-int-divide
|
||||
@opindex mno-inline-int-divide
|
||||
@opindex minline-int-divide
|
||||
Do not generate inline code for divides of integer values.
|
||||
|
||||
@item -minline-sqrt-min-latency
|
||||
|
|
@ -20388,10 +20454,7 @@ harmlessly ignored.)
|
|||
The @code{rtd} instruction is supported by the 68010, 68020, 68030,
|
||||
68040, 68060 and CPU32 processors, but not by the 68000 or 5200.
|
||||
|
||||
@item -mno-rtd
|
||||
@opindex mno-rtd
|
||||
Do not use the calling conventions selected by @option{-mrtd}.
|
||||
This is the default.
|
||||
The default is @option{-mno-rtd}.
|
||||
|
||||
@item -malign-int
|
||||
@itemx -mno-align-int
|
||||
|
|
@ -22093,8 +22156,8 @@ Allow the compiler to generate @emph{Long Instruction Word}
|
|||
instructions if the target is the @samp{AM33} or later. This is the
|
||||
default. This option defines the preprocessor macro @code{__LIW__}.
|
||||
|
||||
@item -mnoliw
|
||||
@opindex mnoliw
|
||||
@item -mno-liw
|
||||
@opindex mno-liw
|
||||
Do not allow the compiler to generate @emph{Long Instruction Word}
|
||||
instructions. This option defines the preprocessor macro
|
||||
@code{__NO_LIW__}.
|
||||
|
|
@ -22105,8 +22168,8 @@ Allow the compiler to generate the @emph{SETLB} and @emph{Lcc}
|
|||
instructions if the target is the @samp{AM33} or later. This is the
|
||||
default. This option defines the preprocessor macro @code{__SETLB__}.
|
||||
|
||||
@item -mnosetlb
|
||||
@opindex mnosetlb
|
||||
@item -mno-setlb
|
||||
@opindex mno-setlb
|
||||
Do not allow the compiler to generate @emph{SETLB} or @emph{Lcc}
|
||||
instructions. This option defines the preprocessor macro
|
||||
@code{__NO_SETLB__}.
|
||||
|
|
@ -22297,27 +22360,27 @@ Generate conditional move instructions.
|
|||
Do not generate conditional move instructions.
|
||||
|
||||
@item -mext-perf
|
||||
@opindex mperf-ext
|
||||
@opindex mext-perf
|
||||
Generate performance extension instructions.
|
||||
|
||||
@item -mno-ext-perf
|
||||
@opindex mno-perf-ext
|
||||
@opindex mno-ext-perf
|
||||
Do not generate performance extension instructions.
|
||||
|
||||
@item -mext-perf2
|
||||
@opindex mperf-ext
|
||||
@opindex mext-perf2
|
||||
Generate performance extension 2 instructions.
|
||||
|
||||
@item -mno-ext-perf2
|
||||
@opindex mno-perf-ext
|
||||
@opindex mno-ext-perf2
|
||||
Do not generate performance extension 2 instructions.
|
||||
|
||||
@item -mext-string
|
||||
@opindex mperf-ext
|
||||
@opindex mext-string
|
||||
Generate string extension instructions.
|
||||
|
||||
@item -mno-ext-string
|
||||
@opindex mno-perf-ext
|
||||
@opindex mno-ext-string
|
||||
Do not generate string extension instructions.
|
||||
|
||||
@item -mv3push
|
||||
|
|
@ -27672,6 +27735,7 @@ register stack, some floating-point opcodes may be emitted even if
|
|||
|
||||
@item -mno-fp-ret-in-387
|
||||
@opindex mno-fp-ret-in-387
|
||||
@opindex mfp-ret-in-387
|
||||
Do not use the FPU registers for return values of functions.
|
||||
|
||||
The usual calling convention has functions return values of types
|
||||
|
|
@ -27684,6 +27748,7 @@ in ordinary CPU registers instead.
|
|||
|
||||
@item -mno-fancy-math-387
|
||||
@opindex mno-fancy-math-387
|
||||
@opindex mfancy-math-387
|
||||
Some 387 emulators do not support the @code{sin}, @code{cos} and
|
||||
@code{sqrt} instructions for the 387. Specify this option to avoid
|
||||
generating those instructions.
|
||||
|
|
@ -28506,6 +28571,7 @@ Here, @code{t5} takes up 2 bytes.
|
|||
|
||||
@item -mno-align-stringops
|
||||
@opindex mno-align-stringops
|
||||
@opindex malign-stringops
|
||||
Do not align the destination of inlined string operations. This switch reduces
|
||||
code size and improves performance in case the destination is already aligned,
|
||||
but GCC doesn't know about it.
|
||||
|
|
@ -28742,6 +28808,7 @@ psABI. It requires the @option{-m32} option to be turned on.
|
|||
|
||||
@item -mno-red-zone
|
||||
@opindex mno-red-zone
|
||||
@opindex mred-zone
|
||||
Do not use a so-called ``red zone'' for x86-64 code. The red zone is mandated
|
||||
by the x86-64 ABI; it is a 128-byte area beyond the location of the
|
||||
stack pointer that is not modified by signal or interrupt handlers
|
||||
|
|
@ -28843,6 +28910,7 @@ appropriately.
|
|||
|
||||
@item -fno-set-stack-executable
|
||||
@opindex fno-set-stack-executable
|
||||
@opindex fset-stack-executable
|
||||
This option is available for MinGW targets. It specifies that
|
||||
the executable flag for the stack used by nested functions isn't
|
||||
set. This is necessary for binaries running in kernel mode of
|
||||
|
|
@ -28851,6 +28919,7 @@ privileges, isn't available.
|
|||
|
||||
@item -fwritable-relocated-rdata
|
||||
@opindex fno-writable-relocated-rdata
|
||||
@opindex fwritable-relocated-rdata
|
||||
This option is available for MinGW and Cygwin targets. It specifies
|
||||
that relocated-data in read-only section is put into the @code{.data}
|
||||
section. This is a necessary for older runtimes not supporting
|
||||
|
|
|
|||
Loading…
Reference in New Issue