;; up pcloads, so we need usable length information for that.
(define_insn "movdf_i4"
[(set (match_operand:DF 0 "general_movdst_operand" "=d,r,d,d,m,r,r,m,!??r,!???d")
- (match_operand:DF 1 "general_movsrc_operand" "d,r,F,m,d,FQ,m,r,d,r"))
- (use (match_operand:PSI 2 "fpscr_operand" "c,c,c,c,c,c,c,c,c,c"))
- (clobber (match_scratch:SI 3 "=X,X,&z,X,X,X,X,X,X,X"))]
+ (match_operand:DF 1 "general_movsrc_operand" "d,r,F,m,d,FQ,m,r,d,r"))
+ (use (match_operand:PSI 2 "fpscr_operand" "c,c,c,c,c,c,c,c,c,c"))
+ (clobber (match_scratch:SI 3 "=X,X,&z,X,X,X,X,X,X,X"))]
"(TARGET_SH4 || TARGET_SH2A_DOUBLE)
&& (arith_reg_operand (operands[0], DFmode)
|| arith_reg_operand (operands[1], DFmode))"
- "@
- fmov %1,%0
- #
- #
- fmov.d %1,%0
- fmov.d %1,%0
- #
- #
- #
- #
- #"
+ {
+ switch (which_alternative)
+ {
+ case 0:
+ if (TARGET_FMOVD)
+ return "fmov %1,%0";
+ else if (REGNO (operands[0]) != REGNO (operands[1]) + 1)
+ return "fmov %R1,%R0\n\tfmov %S1,%S0";
+ else
+ return "fmov %S1,%S0\n\tfmov %R1,%R0";
+ case 3:
+ case 4:
+ return "fmov.d %1,%0";
+ default:
+ return "#";
+ }
+ }
[(set_attr_alternative "length"
- [(if_then_else (eq_attr "fmovd" "yes") (const_int 2) (const_int 4))
+ [(if_then_else (eq_attr "fmovd" "yes") (const_int 4) (const_int 8))
(const_int 4)
(if_then_else (eq_attr "fmovd" "yes") (const_int 4) (const_int 6))
(if_then_else (eq_attr "fmovd" "yes") (const_int 4) (const_int 6))
"(TARGET_SH4 || TARGET_SH2A_DOUBLE) && ! TARGET_FMOVD && reload_completed
&& FP_OR_XD_REGISTER_P (true_regnum (operands[0]))"
[(const_int 0)]
- "
{
int regno = true_regnum (operands[0]);
- rtx addr, insn, adjust = NULL_RTX;
+ rtx addr, insn;
rtx mem2 = change_address (operands[1], SFmode, NULL_RTX);
- rtx reg0 = gen_rtx_REG (SFmode, regno + !! TARGET_LITTLE_ENDIAN);
- rtx reg1 = gen_rtx_REG (SFmode, regno + ! TARGET_LITTLE_ENDIAN);
+ rtx reg0 = gen_rtx_REG (SFmode, regno + (TARGET_LITTLE_ENDIAN ? 1 : 0));
+ rtx reg1 = gen_rtx_REG (SFmode, regno + (TARGET_LITTLE_ENDIAN ? 0 : 1));
operands[1] = copy_rtx (mem2);
addr = XEXP (mem2, 0);
- if (GET_CODE (addr) != POST_INC)
+
+ switch (GET_CODE (addr))
{
- /* If we have to modify the stack pointer, the value that we have
- read with post-increment might be modified by an interrupt,
- so write it back. */
- if (REGNO (addr) == STACK_POINTER_REGNUM)
- adjust = gen_push_e (reg0);
- else
- adjust = gen_addsi3 (addr, addr, GEN_INT (-4));
- XEXP (mem2, 0) = addr = gen_rtx_POST_INC (SImode, addr);
- }
- addr = XEXP (addr, 0);
- insn = emit_insn (gen_movsf_ie (reg0, mem2, operands[2]));
- add_reg_note (insn, REG_INC, addr);
- insn = emit_insn (gen_movsf_ie (reg1, operands[1], operands[2]));
- if (adjust)
- emit_insn (adjust);
- else
- add_reg_note (insn, REG_INC, addr);
+ case REG:
+ /* This is complicated. If the register is an arithmetic register
+ we can just fall through to the REG+DISP case below. Otherwise
+ we have to use a combination of POST_INC and REG addressing... */
+ if (! arith_reg_operand (operands[1], SFmode))
+ {
+ XEXP (mem2, 0) = addr = gen_rtx_POST_INC (SImode, addr);
+ insn = emit_insn (gen_movsf_ie (reg0, mem2, operands[2]));
+ add_reg_note (insn, REG_INC, XEXP (addr, 0));
+
+ emit_insn (gen_movsf_ie (reg1, operands[1], operands[2]));
+
+ /* If we have modified the stack pointer, the value that we have
+ read with post-increment might be modified by an interrupt,
+ so write it back. */
+ if (REGNO (addr) == STACK_POINTER_REGNUM)
+ emit_insn (gen_push_e (reg0));
+ else
+ emit_insn (gen_addsi3 (XEXP (operands[1], 0), XEXP (operands[1], 0), GEN_INT (-4)));
+ break;
+ }
+ /* Fall through. */
+
+ case PLUS:
+ emit_insn (gen_movsf_ie (reg0, operands[1], operands[2]));
+ operands[1] = copy_rtx (operands[1]);
+ XEXP (operands[1], 0) = plus_constant (addr, 4);
+ emit_insn (gen_movsf_ie (reg1, operands[1], operands[2]));
+ break;
+
+ case POST_INC:
+ insn = emit_insn (gen_movsf_ie (reg0, operands[1], operands[2]));
+ add_reg_note (insn, REG_INC, XEXP (addr, 0));
+
+ insn = emit_insn (gen_movsf_ie (reg1, operands[1], operands[2]));
+ add_reg_note (insn, REG_INC, XEXP (addr, 0));
+ break;
+
+ default:
+ debug_rtx (addr);
+ gcc_unreachable ();
+ }
+
DONE;
-}")
+})
(define_split
[(set (match_operand:DF 0 "memory_operand" "")
"(TARGET_SH4 || TARGET_SH2A_DOUBLE) && ! TARGET_FMOVD && reload_completed
&& FP_OR_XD_REGISTER_P (true_regnum (operands[1]))"
[(const_int 0)]
- "
{
int regno = true_regnum (operands[1]);
- rtx insn, addr, adjust = NULL_RTX;
+ rtx insn, addr;
+ rtx reg0 = gen_rtx_REG (SFmode, regno + (TARGET_LITTLE_ENDIAN ? 1 : 0));
+ rtx reg1 = gen_rtx_REG (SFmode, regno + (TARGET_LITTLE_ENDIAN ? 0 : 1));
operands[0] = copy_rtx (operands[0]);
PUT_MODE (operands[0], SFmode);
- insn = emit_insn (gen_movsf_ie (operands[0],
- gen_rtx_REG (SFmode,
- regno + ! TARGET_LITTLE_ENDIAN),
- operands[2]));
- operands[0] = copy_rtx (operands[0]);
addr = XEXP (operands[0], 0);
- if (GET_CODE (addr) != PRE_DEC)
+
+ switch (GET_CODE (addr))
{
- adjust = gen_addsi3 (addr, addr, GEN_INT (4));
- emit_insn_before (adjust, insn);
- XEXP (operands[0], 0) = addr = gen_rtx_PRE_DEC (SImode, addr);
+ case REG:
+ /* This is complicated. If the register is an arithmetic register
+ we can just fall through to the REG+DISP case below. Otherwise
+ we have to use a combination of REG and PRE_DEC addressing... */
+ if (! arith_reg_operand (operands[0], SFmode))
+ {
+ emit_insn (gen_addsi3 (addr, addr, GEN_INT (4)));
+ emit_insn (gen_movsf_ie (operands[0], reg1, operands[2]));
+
+ operands[0] = copy_rtx (operands[0]);
+ XEXP (operands[0], 0) = addr = gen_rtx_PRE_DEC (SImode, addr);
+
+ insn = emit_insn (gen_movsf_ie (operands[0], reg0, operands[2]));
+ add_reg_note (insn, REG_INC, XEXP (addr, 0));
+ break;
+ }
+ /* Fall through. */
+
+ case PLUS:
+ /* Since REG+DISP addressing has already been decided upon by gcc
+ we can rely upon it having chosen an arithmetic register as the
+ register component of the address. Just emit the lower numbered
+ register first, to the lower address, then the higher numbered
+ register to the higher address. */
+ emit_insn (gen_movsf_ie (operands[0], reg0, operands[2]));
+
+ operands[0] = copy_rtx (operands[0]);
+ XEXP (operands[0], 0) = plus_constant (addr, 4);
+
+ emit_insn (gen_movsf_ie (operands[0], reg1, operands[2]));
+ break;
+
+ case PRE_DEC:
+ /* This is easy. Output the word to go to the higher address
+ first (ie the word in the higher numbered register) then the
+ word to go to the lower address. */
+
+ insn = emit_insn (gen_movsf_ie (operands[0], reg1, operands[2]));
+ add_reg_note (insn, REG_INC, XEXP (addr, 0));
+
+ insn = emit_insn (gen_movsf_ie (operands[0], reg0, operands[2]));
+ add_reg_note (insn, REG_INC, XEXP (addr, 0));
+ break;
+
+ default:
+ /* FAIL; */
+ debug_rtx (addr);
+ gcc_unreachable ();
}
- addr = XEXP (addr, 0);
- if (! adjust)
- add_reg_note (insn, REG_INC, addr);
- insn = emit_insn (gen_movsf_ie (operands[0],
- gen_rtx_REG (SFmode,
- regno + !! TARGET_LITTLE_ENDIAN),
- operands[2]));
- add_reg_note (insn, REG_INC, addr);
+
DONE;
-}")
+})
;; If the output is a register and the input is memory or a register, we have
;; to be careful and see which word needs to be loaded first.
(const_int 0)])
(set (attr "fp_mode") (if_then_else (eq_attr "fmovd" "yes")
(const_string "single")
- (const_string "none")))])
+ (const_string "single")))])
(define_split
[(set (match_operand:SF 0 "register_operand" "")
-fgcse -fgcse-after-reload -fgcse-las -fgcse-lm @gol
-fgcse-sm -fif-conversion -fif-conversion2 -findirect-inlining @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
+-finline-small-functions -fipa-cp -fipa-cp-clone -fipa-matrix-reorg -fipa-pta @gol
-fipa-pure-const -fipa-reference -fipa-struct-reorg @gol
-fipa-type-escape -fira-algorithm=@var{algorithm} @gol
-fira-region=@var{region} -fira-coalesce -fno-ira-share-save-slots @gol
-m5-32media -m5-32media-nofpu @gol
-m5-compact -m5-compact-nofpu @gol
-mb -ml -mdalign -mrelax @gol
--mbigtable -mfmovd -mhitachi -mrenesas -mno-renesas -mnomacsave @gol
+-mbigtable -mhitachi -mrenesas -mno-renesas -mnomacsave @gol
-mieee -mbitops -misize -minline-ic_invalidate -mpadstruct -mspace @gol
-mprefergot -musermode -multcost=@var{number} -mdiv=@var{strategy} @gol
-mdivsi3_libfunc=@var{name} -mfixed-range=@var{register-range} @gol
option.
@item @var{language}
-This will display the options supported for @var{language}, where
-@var{language} is the name of one of the languages supported in this
+This will display the options supported for @var{language}, where
+@var{language} is the name of one of the languages supported in this
version of GCC.
@item @samp{common}
@opindex std
Determine the language standard. @xref{Standards,,Language Standards
Supported by GCC}, for details of these standard versions. This option
-is currently only supported when compiling C or C++.
+is currently only supported when compiling C or C++.
The compiler can accept several base standards, such as @samp{c89} or
@samp{c++98}, and GNU dialects of those standards, such as
A pointer is compared against integer zero with @samp{<}, @samp{<=},
@samp{>}, or @samp{>=}.
-@item
+@item
(C++ only) An enumerator and a non-enumerator both appear in a
conditional expression.
-@item
+@item
(C++ only) Ambiguous virtual bases.
-@item
+@item
(C++ only) Subscripting an array which has been declared @samp{register}.
-@item
+@item
(C++ only) Taking the address of a variable which has been declared
@samp{register}.
-@item
+@item
(C++ only) A base class is not initialized in a derived class' copy
constructor.
Level 1: Most aggressive, quick, least accurate.
Possibly useful when higher levels
-do not warn but -fstrict-aliasing still breaks the code, as it has very few
+do not warn but -fstrict-aliasing still breaks the code, as it has very few
false negatives. However, it has many false positives.
-Warns for all pointer conversions between possibly incompatible types,
+Warns for all pointer conversions between possibly incompatible types,
even if never dereferenced. Runs in the frontend only.
Level 2: Aggressive, quick, not too precise.
Unlike level 1, it only warns when an address is taken. Warns about
incomplete types. Runs in the frontend only.
-Level 3 (default for @option{-Wstrict-aliasing}):
-Should have very few false positives and few false
+Level 3 (default for @option{-Wstrict-aliasing}):
+Should have very few false positives and few false
negatives. Slightly slower than levels 1 or 2 when optimization is enabled.
Takes care of the common punn+dereference pattern in the frontend:
@code{*(int*)&some_float}.
-If optimization is enabled, it also runs in the backend, where it deals
+If optimization is enabled, it also runs in the backend, where it deals
with multiple statement cases using flow-sensitive points-to information.
Only warns when the converted pointer is dereferenced.
Does not warn about incomplete types.
@item -fdbg-cnt=@var{counter-value-list}
@opindex fdbg-cnt
-Set the internal debug counter upperbound. @var{counter-value-list}
+Set the internal debug counter upperbound. @var{counter-value-list}
is a comma-separated list of @var{name}:@var{value} pairs
which sets the upperbound of each debug counter @var{name} to @var{value}.
All debug counters have the initial upperbound of @var{UINT_MAX},
@opindex fdump-rtl-ce3
@option{-fdump-rtl-ce1}, @option{-fdump-rtl-ce2}, and
@option{-fdump-rtl-ce3} enable dumping after the three
-if conversion passes.
+if conversion passes.
@itemx -fdump-rtl-cprop_hardreg
@opindex fdump-rtl-cprop_hardreg
@item -fdump-rtl-seqabstr
@opindex fdump-rtl-seqabstr
-Dump after common sequence discovery.
+Dump after common sequence discovery.
@item -fdump-rtl-shorten
@opindex fdump-rtl-shorten
Not all optimizations are controlled directly by a flag. Only
optimizations that have a flag are listed in this section.
-Depending on the target and how GCC was configured, a slightly different
-set of optimizations may be enabled at each @option{-O} level than
-those listed here. You can invoke GCC with @samp{-Q --help=optimizers}
+Depending on the target and how GCC was configured, a slightly different
+set of optimizations may be enabled at each @option{-O} level than
+those listed here. You can invoke GCC with @samp{-Q --help=optimizers}
to find out the exact set of optimizations that are enabled at each level.
@xref{Overall Options}, for examples.
@item -fsel-sched-pipelining
@opindex fsel-sched-pipelining
-Enable software pipelining of innermost loops during selective scheduling.
-This option has no effect until one of @option{-fselective-scheduling} or
+Enable software pipelining of innermost loops during selective scheduling.
+This option has no effect until one of @option{-fselective-scheduling} or
@option{-fselective-scheduling2} is turned on.
@item -fsel-sched-pipelining-outer-loops
@item -fipa-struct-reorg
@opindex fipa-struct-reorg
-Perform structure reorganization optimization, that change C-like structures
-layout in order to better utilize spatial locality. This transformation is
-affective for programs containing arrays of structures. Available in two
+Perform structure reorganization optimization, that change C-like structures
+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). Require @option{-fipa-type-escape}
to provide the safety of this transformation. It works only in whole program
@opindex fipa-cp
Perform interprocedural constant propagation.
This optimization analyzes the program to determine when values passed
-to functions are constants and then optimizes accordingly.
+to functions are constants and then optimizes accordingly.
This optimization can substantially increase performance
if the application has constants passed to functions.
This flag is enabled by default at @option{-O2}, @option{-Os} and @option{-O3}.
of the matrix. The second optimization is matrix transposing that
attempts to change the order of the matrix's dimensions in order to
improve cache locality.
-Both optimizations need the @option{-fwhole-program} flag.
+Both optimizations need the @option{-fwhole-program} flag.
Transposing is enabled only if profiling information is available.
-
@item -ftree-sink
@opindex ftree-sink
Perform forward store motion on trees. This flag is
@item -ftree-builtin-call-dce
@opindex ftree-builtin-call-dce
-Perform conditional dead code elimination (DCE) for calls to builtin functions
-that may set @code{errno} but are otherwise side-effect free. This flag is
-enabled by default at @option{-O2} and higher if @option{-Os} is not also
+Perform conditional dead code elimination (DCE) for calls to builtin functions
+that may set @code{errno} but are otherwise side-effect free. This flag is
+enabled by default at @option{-O2} and higher if @option{-Os} is not also
specified.
@item -ftree-dominator-opts
@item -floop-strip-mine
Perform loop strip mining transformations on loops. Strip mining
-splits a loop into two nested loops. The outer loop has strides
-equal to the strip size and the inner loop has strides of the
+splits a loop into two nested loops. The outer loop has strides
+equal to the strip size and the inner loop has strides of the
original loop within a strip. For example, given a loop like:
@smallexample
DO I = 1, N
Set the directory to search the profile data files in to @var{path}.
This option affects only the profile data generated by
@option{-fprofile-generate}, @option{-ftest-coverage}, @option{-fprofile-arcs}
-and used by @option{-fprofile-use} and @option{-fbranch-probabilities}
+and used by @option{-fprofile-use} and @option{-fbranch-probabilities}
and its related options.
By default, GCC will use the current directory as @var{path}
thus the profile data file will appear in the same directory as the object file.
The threshold ratio (as a percentage) between a structure frequency
and the frequency of the hottest structure in the program. This parameter
is used by struct-reorg optimization enabled by @option{-fipa-struct-reorg}.
-We say that if the ratio of a structure frequency, calculated by profiling,
-to the hottest structure frequency in the program is less than this
+We say that if the ratio of a structure frequency, calculated by profiling,
+to the hottest structure frequency in the program is less than this
parameter, then structure reorganization is not applied to this structure.
The default is 10.
The default value is 50.
@item selsched-max-sched-times
-The maximum number of times that an instruction will be scheduled during
-selective scheduling. This is the limit on the number of iterations
+The maximum number of times that an instruction will be scheduled during
+selective scheduling. This is the limit on the number of iterations
through which the instruction may be pipelined. The default value is 2.
@item selsched-max-insns-to-rename
The size of L2 cache, in kilobytes.
@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 with an
+The minimum ratio between the number of instructions and the
+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
+The minimum ratio between the number of instructions and the
number of memory references to enable prefetching in a loop.
@item use-canonical-types
@cindex linker script
Use @var{script} as the linker script. This option is supported by most
systems using the GNU linker. On some targets, such as bare-board
-targets without an operating system, the @option{-T} option may be required
+targets without an operating system, the @option{-T} option may be required
when linking to avoid references to undefined symbols.
@item -Xlinker @var{option}
@option{-Xlinker "-assert definitions"}, because this passes the entire
string as a single argument, which is not what the linker expects.
-When using the GNU linker, it is usually more convenient to pass
+When using the GNU linker, it is usually more convenient to pass
arguments to linker options using the @option{@var{option}=@var{value}}
syntax than as separate arguments. For example, you can specify
@samp{-Xlinker -Map=output.map} rather than
@opindex Wl
Pass @var{option} as an option to the linker. If @var{option} contains
commas, it is split into multiple options at the commas. You can use this
-syntax to pass an argument to the option.
+syntax to pass an argument to the option.
For example, @samp{-Wl,-Map,output.map} passes @samp{-Map output.map} to the
linker. When using the GNU linker, you can also get the same effect with
@samp{-Wl,-Map=output.map}.
Specifies which floating-point ABI to use. Permissible values
are: @samp{soft}, @samp{softfp} and @samp{hard}.
-Specifying @samp{soft} causes GCC to generate output containing
+Specifying @samp{soft} causes GCC to generate output containing
library calls for floating-point operations.
-@samp{softfp} allows the generation of code using hardware floating-point
-instructions, but still uses the soft-float calling conventions.
-@samp{hard} allows generation of floating-point instructions
+@samp{softfp} allows the generation of code using hardware floating-point
+instructions, but still uses the soft-float calling conventions.
+@samp{hard} allows generation of floating-point instructions
and uses FPU-specific calling conventions.
Using @option{-mfloat-abi=hard} with VFP coprocessors is not supported.
@item -mfp16-format=@var{name}
@opindex mfp16-format
Specify the format of the @code{__fp16} half-precision floating-point type.
-Permissible names are @samp{none}, @samp{ieee}, and @samp{alternative};
-the default is @samp{none}, in which case the @code{__fp16} type is not
+Permissible names are @samp{none}, @samp{ieee}, and @samp{alternative};
+the default is @samp{none}, in which case the @code{__fp16} type is not
defined. @xref{Half-Precision}, for more information.
@item -mstructure-size-boundary=@var{n}
use the 32-bit ARM instruction set.
This option automatically enables either 16-bit Thumb-1 or
mixed 16/32-bit Thumb-2 instructions based on the @option{-mcpu=@var{name}}
-and @option{-march=@var{name}} options. This option is not passed to the
+and @option{-march=@var{name}} options. This option is not passed to the
assembler. If you want to force assembler files to be interpreted as Thumb code,
-either add a @samp{.thumb} directive to the source or pass the @option{-mthumb}
+either add a @samp{.thumb} directive to the source or pass the @option{-mthumb}
option directly to the assembler by prefixing it with @option{-Wa}.
@item -mtpcs-frame
Gives all externally visible functions in the file being compiled an ARM
instruction set header which switches to Thumb mode before executing the
rest of the function. This allows these functions to be called from
-non-interworking code. This option is not valid in AAPCS configurations
+non-interworking code. This option is not valid in AAPCS configurations
because interworking is enabled by default.
@item -mcaller-super-interworking
Allows calls via function pointers (including virtual functions) to
execute correctly regardless of whether the target code has been
compiled for interworking or not. There is a small overhead in the cost
-of executing a function pointer if this option is enabled. This option
+of executing a function pointer if this option is enabled. This option
is not valid in AAPCS configurations because interworking is enabled
by default.
and link scripts will be used to support Core B. This option
defines @code{__BFIN_COREB}. When this option is used, coreb_main
should be used instead of main. It must be used with
-@option{-mmulticore}.
+@option{-mmulticore}.
@item -msdram
@opindex msdram
libraries assume that extended precision (80 bit) floating-point operations
are enabled by default; routines in such libraries could suffer significant
loss of accuracy, typically through so-called "catastrophic cancellation",
-when this option is used to set the precision to less than extended precision.
+when this option is used to set the precision to less than extended precision.
@item -mstackrealign
@opindex mstackrealign
@end table
-
@node MIPS Options
@subsection MIPS Options
@cindex MIPS options
MIPS32 or MIPS64 architecture, it will make use of the MIPS16e ASE@.
MIPS16 code generation can also be controlled on a per-function basis
-by means of @code{mips16} and @code{nomips16} attributes.
+by means of @code{mips16} and @code{nomips16} attributes.
@xref{Function Attributes}, for more information.
@item -mflip-mips16
@itemx -mdouble-float
@opindex msingle-float
@opindex mdouble-float
-Generate code for single or double-precision floating point operations.
-@option{-mdouble-float} implies @option{-msingle-float}.
+Generate code for single or double-precision floating point operations.
+@option{-mdouble-float} implies @option{-msingle-float}.
@item -msimple-fpu
@opindex msimple-fpu
@item -mfpu
@opindex mfpu
-Specify type of floating point unit. Valid values are @var{sp_lite}
+Specify type of floating point unit. Valid values are @var{sp_lite}
(equivalent to -msingle-float -msimple-fpu), @var{dp_lite} (equivalent
to -mdouble-float -msimple-fpu), @var{sp_full} (equivalent to -msingle-float),
and @var{dp_full} (equivalent to -mdouble-float).
@item -mel
@opindex mel
-Compile code for little endian mode.
+Compile code for little endian mode.
@item -mnhwloop
@opindex mnhwloop
@item -mmac
@opindex mmac
-Enable the use of multiply-accumulate instructions. Disabled by default.
+Enable the use of multiply-accumulate instructions. Disabled by default.
@item -mscore5
@opindex mscore5
@opindex mbitops
Enable the use of bit manipulation instructions on SH2A.
-@item -mfmovd
-@opindex mfmovd
-Enable the use of the instruction @code{fmovd}.
-
@item -mhitachi
@opindex mhitachi
Comply with the calling conventions defined by Renesas.
@opindex mhint-max-distance
The encoding of the branch hint instruction limits the hint to be within
256 instructions of the branch it is effecting. By default, GCC makes
-sure it is within 125.
+sure it is within 125.
@item -msafe-hints
@opindex msafe-hints
@item -mpe-aligned-commons
@opindex mpe-aligned-commons
This option is available for Cygwin and MinGW targets. It
-specifies that the GNU extension to the PE file format that
+specifies that the GNU extension to the PE file format that
permits the correct alignment of COMMON variables should be
used when generating code. It will be enabled by default if
GCC detects that the target assembler found during configuration
In C code, controls the placement of uninitialized global variables.
Unix C compilers have traditionally permitted multiple definitions of
such variables in different compilation units by placing the variables
-in a common block.
-This is the behavior specified by @option{-fcommon}, and is the default
-for GCC on most targets.
+in a common block.
+This is the behavior specified by @option{-fcommon}, and is the default
+for GCC on most targets.
On the other hand, this behavior is not required by ISO C, and on some
targets may carry a speed or code size penalty on variable references.
-The @option{-fno-common} option specifies that the compiler should place
+The @option{-fno-common} option specifies that the compiler should place
uninitialized global variables in the data section of the object file,
rather than generating them as common blocks.
-This has the effect that if the same variable is declared
+This has the effect that if the same variable is declared
(without @code{extern}) in two different compilations,
you will get a multiple-definition error when you link them.
-In this case, you must compile with @option{-fcommon} instead.
-Compiling with @option{-fno-common} is useful on targets for which
+In this case, you must compile with @option{-fcommon} instead.
+Compiling with @option{-fno-common} is useful on targets for which
it provides better performance, or if you wish to verify that the
program will work on other systems which always treat uninitialized
variable declarations this way.
projects / platform / upstream / gcc.git / commitdiff