msp430.c (msp430_handle_option): Move function to msp430-common.c
* config/msp430/msp430.c (msp430_handle_option): Move function to msp430-common.c (msp430_option_override): Simplify mcu and mcpu option handling. (msp430_is_f5_mcu): Rename to msp430_use_f5_series_hwmult. Add support for -mhwmult command line option. (has_32bit_hwmult): Rename to use_32bit_hwmult. Add support for -mhwmult command line option. (msp430_hwmult_enabled): Delete. (msp43o_output_labelref): Add support for -mhwmult command line option. * config/msp430/msp430.md (mulhisi3, umulhisi3, mulsidi3) (umulsidi3): Likewise. * config/msp430/msp430.opt (mmcu): Add Report attribute. (mcpu, mlarge, msmall): Likewise. (mhwmult): New option. * config/msp430/msp430-protos.h (msp430_hwmult_enabled): Remove prototype. (msp430_is_f5_mcu): Remove prototype. (msp430_use_f5_series_hwmult): Add prototype. * config/msp430/msp430-opts.h: New file. * common/config/msp430: New directory. * common/config/msp430/msp430-common.c: New file. * config.gcc (msp430): Remove target_has_targetm_common. * doc/invoke.texi: Document -mhwmult command line option. From-SVN: r209685
This commit is contained in:
Nick Clifton
Nick Clifton
parent
8f78ecdbe0
commit
f796136458
10 changed files with 248 additions and 97 deletions
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@ -1,3 +1,30 @@
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2014-04-23 Nick Clifton <nickc@redhat.com>
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* config/msp430/msp430.c (msp430_handle_option): Move function
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to msp430-common.c
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(msp430_option_override): Simplify mcu and mcpu option handling.
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(msp430_is_f5_mcu): Rename to msp430_use_f5_series_hwmult. Add
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support for -mhwmult command line option.
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(has_32bit_hwmult): Rename to use_32bit_hwmult. Add support for
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-mhwmult command line option.
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(msp430_hwmult_enabled): Delete.
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(msp43o_output_labelref): Add support for -mhwmult command line
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option.
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* config/msp430/msp430.md (mulhisi3, umulhisi3, mulsidi3)
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(umulsidi3): Likewise.
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* config/msp430/msp430.opt (mmcu): Add Report attribute.
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(mcpu, mlarge, msmall): Likewise.
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(mhwmult): New option.
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* config/msp430/msp430-protos.h (msp430_hwmult_enabled): Remove
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prototype.
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(msp430_is_f5_mcu): Remove prototype.
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(msp430_use_f5_series_hwmult): Add prototype.
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* config/msp430/msp430-opts.h: New file.
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* common/config/msp430: New directory.
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* common/config/msp430/msp430-common.c: New file.
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* config.gcc (msp430): Remove target_has_targetm_common.
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* doc/invoke.texi: Document -mhwmult command line option.
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2014-04-23 Nick Clifton <nickc@redhat.com>
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* config/i386/cygwin.h (ENDFILE_SPEC): Include
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91
gcc/common/config/msp430/msp430-common.c
Normal file
91
gcc/common/config/msp430/msp430-common.c
Normal file
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@ -0,0 +1,91 @@
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/* Common hooks for Texas Instruments MSP430.
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Copyright (C) 2014 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "diagnostic-core.h"
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#include "tm.h"
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#include "common/common-target.h"
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#include "common/common-target-def.h"
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#include "opts.h"
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#include "flags.h"
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/* Handle -mcpu= and -mmcu= here. We want to ensure that only one
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of these two options - the last specified on the command line -
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is passed on to the msp430 backend. */
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static bool
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msp430_handle_option (struct gcc_options *opts ATTRIBUTE_UNUSED,
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struct gcc_options *opts_set ATTRIBUTE_UNUSED,
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const struct cl_decoded_option *decoded,
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location_t loc ATTRIBUTE_UNUSED)
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{
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switch (decoded->opt_index)
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{
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case OPT_mcpu_:
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if (strcasecmp (decoded->arg, "msp430x") == 0
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|| strcasecmp (decoded->arg, "msp430xv2") == 0
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|| strcasecmp (decoded->arg, "430x") == 0
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|| strcasecmp (decoded->arg, "430xv2") == 0)
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{
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target_cpu = "msp430x";
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target_mcu = NULL;
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}
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else if (strcasecmp (decoded->arg, "msp430") == 0
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|| strcasecmp (decoded->arg, "430") == 0)
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{
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target_cpu = "msp430";
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target_mcu = NULL;
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}
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else
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{
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error ("unrecognised argument of -mcpu: %s", decoded->arg);
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return false;
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}
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break;
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case OPT_mmcu_:
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/* For backwards compatibility we recognise two generic MCU
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430X names. However we want to be able to generate special C
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preprocessor defines for them, which is why we set target_mcu
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to NULL. */
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if (strcasecmp (decoded->arg, "msp430") == 0)
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{
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target_cpu = "msp430";
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target_mcu = NULL;
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}
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else if (strcasecmp (decoded->arg, "msp430x") == 0
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|| strcasecmp (decoded->arg, "msp430xv2") == 0)
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{
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target_cpu = "msp430x";
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target_mcu = NULL;
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}
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else
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target_cpu = NULL;
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break;
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}
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return true;
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}
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#undef TARGET_HANDLE_OPTION
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#define TARGET_HANDLE_OPTION msp430_handle_option
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struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;
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@ -2108,7 +2108,6 @@ msp430*-*-*)
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tm_file="dbxelf.h elfos.h newlib-stdint.h ${tm_file}"
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c_target_objs="msp430-c.o"
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cxx_target_objs="msp430-c.o"
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target_has_targetm_common=no
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tmake_file="${tmake_file} msp430/t-msp430"
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;;
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nds32le-*-*)
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32
gcc/config/msp430/msp430-opts.h
Normal file
32
gcc/config/msp430/msp430-opts.h
Normal file
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@ -0,0 +1,32 @@
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/* GCC option-handling definitions for the TI MSP430
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Copyright (C) 2014 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published
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by the Free Software Foundation; either version 3, or (at your
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option) any later version.
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GCC is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU General Public License
|
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef MSP430_OPTS_H
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#define MSP430_OPTS_H
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enum msp430_hwmult_types
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{
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NONE,
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AUTO,
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SMALL,
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LARGE,
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F5SERIES
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};
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#endif
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@ -30,11 +30,9 @@ const char * msp430x_extendhisi (rtx *);
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void msp430_fixup_compare_operands (enum machine_mode, rtx *);
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int msp430_hard_regno_mode_ok (int, enum machine_mode);
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int msp430_hard_regno_nregs (int, enum machine_mode);
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bool msp430_hwmult_enabled (void);
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rtx msp430_incoming_return_addr_rtx (void);
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void msp430_init_cumulative_args (CUMULATIVE_ARGS *, tree, rtx, tree, int);
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int msp430_initial_elimination_offset (int, int);
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bool msp430_is_f5_mcu (void);
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bool msp430_is_interrupt_func (void);
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const char * msp430x_logical_shift_right (rtx);
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const char * msp430_mcu_name (void);
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@ -45,5 +43,6 @@ rtx msp430_return_addr_rtx (int);
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void msp430_split_movsi (rtx *);
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void msp430_start_function (FILE *, const char *, tree);
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rtx msp430_subreg (enum machine_mode, rtx, enum machine_mode, int);
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bool msp430_use_f5_series_hwmult (void);
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#endif /* GCC_MSP430_PROTOS_H */
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@ -95,18 +95,6 @@ msp430_init_machine_status (void)
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return m;
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}
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#undef TARGET_HANDLE_OPTION
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#define TARGET_HANDLE_OPTION msp430_handle_option
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bool
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msp430_handle_option (struct gcc_options *opts ATTRIBUTE_UNUSED,
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struct gcc_options *opts_set ATTRIBUTE_UNUSED,
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const struct cl_decoded_option *decoded ATTRIBUTE_UNUSED,
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location_t loc ATTRIBUTE_UNUSED)
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{
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return true;
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}
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#undef TARGET_OPTION_OVERRIDE
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#define TARGET_OPTION_OVERRIDE msp430_option_override
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@ -196,19 +184,14 @@ msp430_option_override (void)
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if (target_cpu)
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{
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if (strcasecmp (target_cpu, "msp430x") == 0
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|| strcasecmp (target_cpu, "msp430xv2") == 0
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|| strcasecmp (target_cpu, "430x") == 0
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|| strcasecmp (target_cpu, "430xv2") == 0)
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if (strcasecmp (target_cpu, "msp430x") == 0)
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msp430x = true;
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else if (strcasecmp (target_cpu, "msp430") == 0
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|| strcasecmp (target_cpu, "430") == 0)
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else /* target_cpu == "msp430" - already handled by the front end. */
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msp430x = false;
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else
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error ("unrecognised argument of -mcpu: %s", target_cpu);
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}
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if (target_mcu)
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/* Note - the front end has already ensured at most
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one of target_cpu and target_mcu will be set. */
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else if (target_mcu)
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{
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int i;
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@ -217,25 +200,12 @@ msp430_option_override (void)
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supports 430. */
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msp430x = true;
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/* For backwards compatibility we recognise two generic MCU
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430X names. However we want to be able to generate special C
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preprocessor defines for them, which is why we set target_mcu
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to NULL. */
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if (strcasecmp (target_mcu, "msp430") == 0)
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{
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msp430x = false;
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target_mcu = NULL;
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}
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else if (strcasecmp (target_mcu, "msp430x") == 0
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|| strcasecmp (target_mcu, "msp430xv2") == 0)
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target_mcu = NULL;
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else
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for (i = ARRAY_SIZE (msp430_mcu_names); i--;)
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if (strcasecmp (msp430_mcu_names[i], target_mcu) == 0)
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{
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msp430x = false;
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break;
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}
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for (i = ARRAY_SIZE (msp430_mcu_names); i--;)
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if (strcasecmp (msp430_mcu_names[i], target_mcu) == 0)
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{
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msp430x = false;
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break;
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}
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/* It is not an error if we do not match the MCU name. There are
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hundreds of them. */
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}
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@ -1847,16 +1817,20 @@ static const struct
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|||
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||||
/* Returns true if the current MCU is an F5xxx series. */
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bool
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msp430_is_f5_mcu (void)
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msp430_use_f5_series_hwmult (void)
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||||
{
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if (target_mcu == NULL)
|
||||
if (msp430_hwmult_type == F5SERIES)
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return true;
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if (target_mcu == NULL || msp430_hwmult_type != AUTO)
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return false;
|
||||
|
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return strncasecmp (target_mcu, "msp430f5", 8) == 0;
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}
|
||||
|
||||
/* Returns true id the current MCU has a second generation 32-bit hardware multiplier. */
|
||||
static bool
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has_32bit_hw_mult (void)
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use_32bit_hwmult (void)
|
||||
{
|
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static const char * known_32bit_mult_mcus [] =
|
||||
{
|
||||
|
|
@ -1868,7 +1842,11 @@ has_32bit_hw_mult (void)
|
|||
"msp430f47177", "msp430f47187", "msp430f47197"
|
||||
};
|
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int i;
|
||||
if (target_mcu == NULL)
|
||||
|
||||
if (msp430_hwmult_type == LARGE)
|
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return true;
|
||||
|
||||
if (target_mcu == NULL || msp430_hwmult_type != AUTO)
|
||||
return false;
|
||||
|
||||
for (i = ARRAY_SIZE (known_32bit_mult_mcus); i--;)
|
||||
|
|
@ -1878,25 +1856,6 @@ has_32bit_hw_mult (void)
|
|||
return false;
|
||||
}
|
||||
|
||||
/* Returns true if hardware multiply is supported by the chosen MCU. */
|
||||
bool
|
||||
msp430_hwmult_enabled (void)
|
||||
{
|
||||
if (target_mcu == NULL)
|
||||
return false;
|
||||
|
||||
if (!ENABLE_HWMULT)
|
||||
return false;
|
||||
|
||||
if (msp430_is_interrupt_func ())
|
||||
return false;
|
||||
|
||||
if (msp430_is_f5_mcu () || has_32bit_hw_mult ())
|
||||
return true;
|
||||
|
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return false;
|
||||
}
|
||||
|
||||
/* This function does the same as the default, but it will replace GCC
|
||||
function names with the MSPABI-specified ones. */
|
||||
void
|
||||
|
|
@ -1913,20 +1872,20 @@ msp430_output_labelref (FILE *file, const char *name)
|
|||
|
||||
/* If we have been given a specific MCU name then we may be
|
||||
able to make use of its hardware multiply capabilities. */
|
||||
if (msp430_hwmult_enabled ())
|
||||
if (msp430_hwmult_type != NONE)
|
||||
{
|
||||
if (strcmp ("__mspabi_mpyi", name) == 0)
|
||||
{
|
||||
if (msp430_is_f5_mcu ())
|
||||
if (msp430_use_f5_series_hwmult ())
|
||||
name = "__mulhi2_f5";
|
||||
else
|
||||
name = "__mulhi2";
|
||||
}
|
||||
else if (strcmp ("__mspabi_mpyl", name) == 0)
|
||||
{
|
||||
if (msp430_is_f5_mcu ())
|
||||
if (msp430_use_f5_series_hwmult ())
|
||||
name = "__mulsi2_f5";
|
||||
else if (has_32bit_hw_mult ())
|
||||
else if (use_32bit_hwmult ())
|
||||
name = "__mulsi2_hw32";
|
||||
else
|
||||
name = "__mulsi2";
|
||||
|
|
|
|||
|
|
@ -1321,12 +1321,12 @@
|
|||
[(set (match_operand:SI 0 "register_operand" "=r")
|
||||
(mult:SI (sign_extend:SI (match_operand:HI 1 "register_operand" "%0"))
|
||||
(sign_extend:SI (match_operand:HI 2 "register_operand" "r"))))]
|
||||
"optimize > 2 && msp430_hwmult_enabled ()"
|
||||
"optimize > 2 && msp430_hwmult_type != NONE && ! msp430_is_interrupt_func ()"
|
||||
"*
|
||||
if (msp430_is_f5_mcu ())
|
||||
return \"MOV.W %1, &0x04C2 { MOV.W %2, &0x04C8 { MOV.W &0x04CA, %L0 { MOV.W &0x04CC, %H0\";
|
||||
if (msp430_use_f5_series_hwmult ())
|
||||
return \"PUSH.W sr { DINT { MOV.W %1, &0x04C2 { MOV.W %2, &0x04C8 { MOV.W &0x04CA, %L0 { MOV.W &0x04CC, %H0 { POP.W sr\";
|
||||
else
|
||||
return \"MOV.W %1, &0x0132 { MOV.W %2, &0x0138 { MOV.W &0x013A, %L0 { MOV.W &0x013C, %H0\";
|
||||
return \"PUSH.W sr { DINT { MOV.W %1, &0x0132 { MOV.W %2, &0x0138 { MOV.W &0x013A, %L0 { MOV.W &0x013C, %H0 { POP.W sr\";
|
||||
"
|
||||
)
|
||||
|
||||
|
|
@ -1334,12 +1334,12 @@
|
|||
[(set (match_operand:SI 0 "register_operand" "=r")
|
||||
(mult:SI (zero_extend:SI (match_operand:HI 1 "register_operand" "%0"))
|
||||
(zero_extend:SI (match_operand:HI 2 "register_operand" "r"))))]
|
||||
"optimize > 2 && msp430_hwmult_enabled ()"
|
||||
"optimize > 2 && msp430_hwmult_type != NONE"
|
||||
"*
|
||||
if (msp430_is_f5_mcu ())
|
||||
return \"MOV.W %1, &0x04C0 { MOV.W %2, &0x04C8 { MOV.W &0x04CA, %L0 { MOV.W &0x04CC, %H0\";
|
||||
if (msp430_use_f5_series_hwmult ())
|
||||
return \"PUSH.W sr { DINT { MOV.W %1, &0x04C0 { MOV.W %2, &0x04C8 { MOV.W &0x04CA, %L0 { MOV.W &0x04CC, %H0 { POP.W sr\";
|
||||
else
|
||||
return \"MOV.W %1, &0x0130 { MOV.W %2, &0x0138 { MOV.W &0x013A, %L0 { MOV.W &0x013C, %H0\";
|
||||
return \"PUSH.W sr { DINT { MOV.W %1, &0x0130 { MOV.W %2, &0x0138 { MOV.W &0x013A, %L0 { MOV.W &0x013C, %H0 { POP.W sr\";
|
||||
"
|
||||
)
|
||||
|
||||
|
|
@ -1347,12 +1347,12 @@
|
|||
[(set (match_operand:DI 0 "register_operand" "=r")
|
||||
(mult:DI (sign_extend:DI (match_operand:SI 1 "register_operand" "%0"))
|
||||
(sign_extend:DI (match_operand:SI 2 "register_operand" "r"))))]
|
||||
"optimize > 2 && msp430_hwmult_enabled ()"
|
||||
"optimize > 2 && msp430_hwmult_type != NONE"
|
||||
"*
|
||||
if (msp430_is_f5_mcu ())
|
||||
return \"MOV.W %L1, &0x04D4 { MOV.W %H1, &0x04D6 { MOV.W %L2, &0x04E0 { MOV.W %H2, &0x04E2 { MOV.W &0x04E4, %A0 { MOV.W &0x04E6, %B0 { MOV.W &0x04E8, %C0 { MOV.W &0x04EA, %D0\";
|
||||
if (msp430_use_f5_series_hwmult ())
|
||||
return \"PUSH.W sr { DINT { MOV.W %L1, &0x04D4 { MOV.W %H1, &0x04D6 { MOV.W %L2, &0x04E0 { MOV.W %H2, &0x04E2 { MOV.W &0x04E4, %A0 { MOV.W &0x04E6, %B0 { MOV.W &0x04E8, %C0 { MOV.W &0x04EA, %D0 { POP.W sr\";
|
||||
else
|
||||
return \"MOV.W %L1, &0x0144 { MOV.W %H1, &0x0146 { MOV.W %L2, &0x0150 { MOV.W %H2, &0x0152 { MOV.W &0x0154, %A0 { MOV.W &0x0156, %B0 { MOV.W &0x0158, %C0 { MOV.W &0x015A, %D0\";
|
||||
return \"PUSH.W sr { DINT { MOV.W %L1, &0x0144 { MOV.W %H1, &0x0146 { MOV.W %L2, &0x0150 { MOV.W %H2, &0x0152 { MOV.W &0x0154, %A0 { MOV.W &0x0156, %B0 { MOV.W &0x0158, %C0 { MOV.W &0x015A, %D0 { POP.W sr\";
|
||||
"
|
||||
)
|
||||
|
||||
|
|
@ -1360,11 +1360,11 @@
|
|||
[(set (match_operand:DI 0 "register_operand" "=r")
|
||||
(mult:DI (zero_extend:DI (match_operand:SI 1 "register_operand" "%0"))
|
||||
(zero_extend:DI (match_operand:SI 2 "register_operand" "r"))))]
|
||||
"optimize > 2 && msp430_hwmult_enabled ()"
|
||||
"optimize > 2 && msp430_hwmult_type != NONE"
|
||||
"*
|
||||
if (msp430_is_f5_mcu ())
|
||||
return \"MOV.W %L1, &0x04D0 { MOV.W %H1, &0x04D2 { MOV.W %L2, &0x04E0 { MOV.W %H2, &0x04E2 { MOV.W &0x04E4, %A0 { MOV.W &0x04E6, %B0 { MOV.W &0x04E8, %C0 { MOV.W &0x04EA, %D0\";
|
||||
if (msp430_use_f5_series_hwmult ())
|
||||
return \"PUSH.W sr { DINT { MOV.W %L1, &0x04D0 { MOV.W %H1, &0x04D2 { MOV.W %L2, &0x04E0 { MOV.W %H2, &0x04E2 { MOV.W &0x04E4, %A0 { MOV.W &0x04E6, %B0 { MOV.W &0x04E8, %C0 { MOV.W &0x04EA, %D0 { POP.W sr\";
|
||||
else
|
||||
return \"MOV.W %L1, &0x0140 { MOV.W %H1, &0x0141 { MOV.W %L2, &0x0150 { MOV.W %H2, &0x0152 { MOV.W &0x0154, %A0 { MOV.W &0x0156, %B0 { MOV.W &0x0158, %C0 { MOV.W &0x015A, %D0\";
|
||||
return \"PUSH.W sr { DINT { MOV.W %L1, &0x0140 { MOV.W %H1, &0x0141 { MOV.W %L2, &0x0150 { MOV.W %H2, &0x0152 { MOV.W &0x0154, %A0 { MOV.W &0x0156, %B0 { MOV.W &0x0158, %C0 { MOV.W &0x015A, %D0 { POP.W sr\";
|
||||
"
|
||||
)
|
||||
|
|
|
|||
|
|
@ -7,19 +7,19 @@ Target Mask(ASM_HEX)
|
|||
Force assembly output to always use hex constants
|
||||
|
||||
mmcu=
|
||||
Target ToLower Joined RejectNegative Var(target_mcu)
|
||||
Target Report ToLower Joined RejectNegative Var(target_mcu)
|
||||
Specify the MCU to build for.
|
||||
|
||||
mcpu=
|
||||
Target Joined RejectNegative Var(target_cpu)
|
||||
Target Report Joined RejectNegative Var(target_cpu)
|
||||
Specify the ISA to build for: msp430, mdsp430x, msp430xv2
|
||||
|
||||
mlarge
|
||||
Target Mask(LARGE) RejectNegative
|
||||
Target Report Mask(LARGE) RejectNegative
|
||||
Select large model - 20-bit addresses/pointers
|
||||
|
||||
msmall
|
||||
Target InverseMask(LARGE) RejectNegative
|
||||
Target Report InverseMask(LARGE) RejectNegative
|
||||
Select small model - 16-bit addresses/pointers (default)
|
||||
|
||||
mrelax
|
||||
|
|
@ -33,6 +33,27 @@ minrt
|
|||
Target Report Mask(MINRT) RejectNegative
|
||||
Use a minimum runtime (no static initializers or ctors) for memory-constrained devices.
|
||||
|
||||
mhwmult
|
||||
Target Report Var(ENABLE_HWMULT, 1) Init(1)
|
||||
Enable hardware multiply (except in interrupt routines)
|
||||
HeaderInclude
|
||||
config/msp430/msp430-opts.h
|
||||
|
||||
mhwmult=
|
||||
Target Joined RejectNegative Report ToLower Var(msp430_hwmult_type) Enum(msp430_hwmult_types) Init(AUTO)
|
||||
Specify the type of hardware multiply to support
|
||||
|
||||
Enum
|
||||
Name(msp430_hwmult_types) Type(enum msp430_hwmult_types)
|
||||
|
||||
EnumValue
|
||||
Enum(msp430_hwmult_types) String(none) Value(NONE)
|
||||
|
||||
EnumValue
|
||||
Enum(msp430_hwmult_types) String(auto) Value(AUTO)
|
||||
|
||||
EnumValue
|
||||
Enum(msp430_hwmult_types) String(16bit) Value(SMALL)
|
||||
|
||||
EnumValue
|
||||
Enum(msp430_hwmult_types) String(32bit) Value(LARGE)
|
||||
|
||||
EnumValue
|
||||
Enum(msp430_hwmult_types) String(f5series) Value(F5SERIES)
|
||||
|
|
|
|||
|
|
@ -42,8 +42,8 @@
|
|||
)
|
||||
|
||||
(define_insn "*movhi_virt"
|
||||
[(set (match_operand:HI 0 "nonimmediate_operand" "=vYS,v,Wfr")
|
||||
(match_operand:HI 1 "general_operand" "viYS,Wfr,v"))]
|
||||
[(set (match_operand:HI 0 "nonimmediate_operand" "=vS, Y, v, Wfr")
|
||||
(match_operand:HI 1 "general_operand" "viYS, viS, Wfr, v"))]
|
||||
"rl78_virt_insns_ok ()"
|
||||
"v.movw %0, %1"
|
||||
[(set_attr "valloc" "op1")]
|
||||
|
|
|
|||
|
|
@ -826,7 +826,8 @@ Objective-C and Objective-C++ Dialects}.
|
|||
@gccoptlist{-meb -mel -mno-crt0}
|
||||
|
||||
@emph{MSP430 Options}
|
||||
@gccoptlist{-msim -masm-hex -mmcu= -mcpu= -mlarge -msmall -mrelax}
|
||||
@gccoptlist{-msim -masm-hex -mmcu= -mcpu= -mlarge -msmall -mrelax @gol
|
||||
-mhwmult=}
|
||||
|
||||
@emph{NDS32 Options}
|
||||
@gccoptlist{-mbig-endian -mlittle-endian @gol
|
||||
|
|
@ -18242,6 +18243,28 @@ This option is passed to the assembler and linker, and allows the
|
|||
linker to perform certain optimizations that cannot be done until
|
||||
the final link.
|
||||
|
||||
@item mhwmult=
|
||||
@opindex mhwmult=
|
||||
Describes the type of hardware multiply supported by the target.
|
||||
Accepted values are @code{none} for no hardware multiply, @code{16bit}
|
||||
for the original 16-bit-only multiply supported by early MCUs.
|
||||
@code{32bit} for the 16/32-bit multiply supported by later MCUs and
|
||||
@code{f5series} for the 16/32-bit multiply supported by F5-series MCUs.
|
||||
A value of @code{auto} can also be given. This tells GCC to deduce
|
||||
the hardware multiply support based upon the MCU name provided by the
|
||||
@option{-mmcu} option. If no @option{-mmcu} option is specified then
|
||||
@code{32bit} hardware multiply support is assumed. @code{auto} is the
|
||||
default setting.
|
||||
|
||||
Hardware multiplies are normally performed by calling a library
|
||||
routine. This saves space in the generated code. When compiling at
|
||||
@code{-O3} or higher however the hardware multiplier is invoked
|
||||
inline. This makes for bigger, but faster code.
|
||||
|
||||
The hardware multiply routines disable interrupts whilst running and
|
||||
restore the previous interrupt state when they finish. This makes
|
||||
them safe to use inside interrupt handlers as well as in normal code.
|
||||
|
||||
@end table
|
||||
|
||||
@node NDS32 Options
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue