@c Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
-@c 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+@c 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
@c Free Software Foundation, Inc.
@c This is part of the GCC manual.
@c For copying conditions, see the file gcc.texi.
@c man begin COPYRIGHT
Copyright @copyright{} 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
-1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document
-Wstrict-overflow -Wstrict-overflow=@var{n} @gol
-Wswitch -Wswitch-default -Wswitch-enum -Wsync-nand @gol
-Wsystem-headers -Wtrigraphs -Wtype-limits -Wundef -Wuninitialized @gol
--Wunknown-pragmas -Wno-pragmas -Wunreachable-code @gol
+-Wunknown-pragmas -Wno-pragmas @gol
-Wunsuffixed-float-constants -Wunused -Wunused-function @gol
-Wunused-label -Wunused-parameter -Wno-unused-result -Wunused-value -Wunused-variable @gol
-Wvariadic-macros -Wvla @gol
@opindex Wno-nested-externs
Warn if an @code{extern} declaration is encountered within a function.
-@item -Wunreachable-code
-@opindex Wunreachable-code
-@opindex Wno-unreachable-code
-Warn if the compiler detects that code will never be executed.
-
-This option is intended to warn when the compiler detects that at
-least a whole line of source code will never be executed, because
-some condition is never satisfied or because it is after a
-procedure that never returns.
-
-It is possible for this option to produce a warning even though there
-are circumstances under which part of the affected line can be executed,
-so care should be taken when removing apparently-unreachable code.
-
-For instance, when a function is inlined, a warning may mean that the
-line is unreachable in only one inlined copy of the function.
-
-This option is not made part of @option{-Wall} because in a debugging
-version of a program there is often substantial code which checks
-correct functioning of the program and is, hopefully, unreachable
-because the program does work. Another common use of unreachable
-code is to provide behavior which is selectable at compile-time.
-
@item -Winline
@opindex Winline
@opindex Wno-inline
Not all optimizations are controlled directly by a flag. Only
optimizations that have a flag are listed in this section.
-Most of the optimizations are not enabled if a @option{-O} level is not set on
-the command line, even if individual optimization flags are specified.
+Most optimizations are only enabled if an @option{-O} level is set on
+the command line. Otherwise they are disabled, even if individual
+optimization flags are specified.
Depending on the target and how GCC was configured, a slightly different
set of optimizations may be enabled at each @option{-O} level than
strict version check, so bytecode files generated in one version of
GCC will not work with an older/newer version of GCC.
+Link time optimization does not play well with generating debugging
+information. Combining @option{-flto} or @option{-fwhopr} with
+@option{-g} is experimental.
+
This option is disabled by default.
@item -fwhopr
Disabled by default.
+This option is experimental.
+
@item -fwpa
@opindex fwpa
This is an internal option used by GCC when compiling with
parameter, then structure reorganization is not applied to this structure.
The default is 10.
-@item predictable-branch-cost-outcome
+@item predictable-branch-outcome
When branch is predicted to be taken with probability lower than this threshold
(in percent), then it is considered well predictable. The default is 10.
@samp{603e}, @samp{604}, @samp{604e}, @samp{620}, @samp{630}, @samp{740},
@samp{7400}, @samp{7450}, @samp{750}, @samp{801}, @samp{821}, @samp{823},
@samp{860}, @samp{970}, @samp{8540}, @samp{a2}, @samp{e300c2},
-@samp{e300c3}, @samp{e500mc}, @samp{ec603e}, @samp{G3}, @samp{G4}, @samp{G5},
-@samp{power}, @samp{power2}, @samp{power3}, @samp{power4},
-@samp{power5}, @samp{power5+}, @samp{power6}, @samp{power6x}, @samp{power7},
-@samp{common}, @samp{powerpc}, @samp{powerpc64}, @samp{rios},
+@samp{e300c3}, @samp{e500mc}, @samp{e500mc64}, @samp{ec603e}, @samp{G3},
+@samp{G4}, @samp{G5}, @samp{power}, @samp{power2}, @samp{power3},
+@samp{power4}, @samp{power5}, @samp{power5+}, @samp{power6}, @samp{power6x},
+@samp{power7}, @samp{common}, @samp{powerpc}, @samp{powerpc64}, @samp{rios},
@samp{rios1}, @samp{rios2}, @samp{rsc}, and @samp{rs64}.
@option{-mcpu=common} selects a completely generic processor. Code
signals may get corrupted data.
@item -mavoid-indexed-addresses
-@item -mno-avoid-indexed-addresses
+@itemx -mno-avoid-indexed-addresses
@opindex mavoid-indexed-addresses
@opindex mno-avoid-indexed-addresses
Generate code that tries to avoid (not avoid) the use of indexed load
@subsection RX Options
@cindex RX Options
-These @option{-m} options are defined for RX implementations:
+These command line options are defined for RX targets:
@table @gcctabopt
@item -m64bit-doubles
@itemx -m32bit-doubles
-@itemx -fpu
-@itemx -nofpu
@opindex m64bit-doubles
@opindex m32bit-doubles
-@opindex fpu
-@opindex nofpu
Make the @code{double} data type be 64-bits (@option{-m64bit-doubles})
or 32-bits (@option{-m32bit-doubles}) in size. The default is
-@option{-m64bit-doubles}. @emph{Note} the RX's hardware floating
-point instructions are only used for 32-bit floating point values, and
-then only if @option{-ffast-math} has been specified on the command
-line. This is because the RX FPU instructions do not properly support
-denormal (or sub-normal) values.
-
-The options @option{-fpu} and @option{-nofpu} have been provided at
-the request of Rensas for compatibility with their toolchain. The
-@option{-mfpu} option enables the use of RX FPU instructions by
-selecting 32-bit doubles and enabling unsafe math optimizations. The
-@option{-mnofpu} option disables the use of RX FPU instructions, even
-if @option{-m32bit-doubles} is active and unsafe math optimizations
-have been enabled.
+@option{-m32bit-doubles}. @emph{Note} RX floating point hardware only
+works on 32-bit values, which is why the default is
+@option{-m32bit-doubles}.
+
+@item -fpu
+@itemx -nofpu
+@opindex fpu
+@opindex nofpu
+Enables (@option{-fpu}) or disables (@option{-nofpu}) the use of RX
+floating point hardware. The default is enabled for the @var{RX600}
+series and disabled for the @var{RX200} series.
+
+Floating point instructions will only be generated for 32-bit floating
+point values however, so if the @option{-m64bit-doubles} option is in
+use then the FPU hardware will not be used for doubles.
+
+@emph{Note} If the @option{-fpu} option is enabled then
+@option{-funsafe-math-optimizations} is also enabled automatically.
+This is because the RX FPU instructions are themselves unsafe.
@item -mcpu=@var{name}
@itemx -patch=@var{name}
@opindex -mcpu
@opindex -patch
-Selects the type of RX CPU to be targeted. Currently on two types are
-supported, the generic @var{RX600} and the specific @var{RX610}. The
-only difference between them is that the @var{RX610} does not support
-the @code{MVTIPL} instruction.
+Selects the type of RX CPU to be targeted. Currently three types are
+supported, the generic @var{RX600} and @var{RX200} series hardware and
+the specific @var{RX610} cpu. The default is @var{RX600}.
+
+The only difference between @var{RX600} and @var{RX610} is that the
+@var{RX610} does not support the @code{MVTIPL} instruction.
+
+The @var{RX200} series does not have a hardware floating point unit
+and so @option{-nofpu} is enabled by default when this type is
+selected.
@item -mbig-endian-data
@itemx -mlittle-endian-data
Note, common variables (variables which have not been initialised) and
constants are not placed into the small data area as they are assigned
-to other sections in the output executeable.
+to other sections in the output executable.
The default value is zero, which disables this feature. Note, this
feature is not enabled by default with higher optimization levels
-(@option{-O2} etc) because of the potentially deterimental effects of
+(@option{-O2} etc) because of the potentially detrimental effects of
reserving register @code{r13}. It is up to the programmer to
experiment and discover whether this feature is of benefit to their
program.
@item -msim
-@item -mno-sim
+@itemx -mno-sim
@opindex msim
@opindex mno-sim
Use the simulator runtime. The default is to use the libgloss board
specific runtime.
@item -mas100-syntax
-@item -mno-as100-syntax
+@itemx -mno-as100-syntax
@opindex mas100-syntax
@opindex mno-as100-syntax
When generating assembler output use a syntax that is compatible with
@opindex mmax-constant-size
Specifies the maxium size, in bytes, of a constant that can be used as
an operand in a RX instruction. Although the RX instruction set does
-allow consants of up to 4 bytes in length to be used in instructions,
+allow constants of up to 4 bytes in length to be used in instructions,
a longer value equates to a longer instruction. Thus in some
circumstances it can be beneficial to restrict the size of constants
that are used in instructions. Constants that are too big are instead
placed into a constant pool and referenced via register indirection.
-The value @var{N} can be between 0 and 3. A value of 0, the default,
-means that constants of any size are allowed.
+The value @var{N} can be between 0 and 4. A value of 0 (the default)
+or 4 means that constants of any size are allowed.
@item -mrelax
@opindex mrelax
@opindex municode
This option is available for mingw-w64 targets. It specifies
that the UNICODE macro is getting pre-defined and that the
-unicode capable runtime startup code is choosen.
+unicode capable runtime startup code is chosen.
@item -mwin32
@opindex mwin32
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