bf7b94d407
Hardware multipliers that support widening 32-bit multiplication can
be used to perform a 64-bit * 64-bit multiplication more efficiently
than a software implementation.
The following equation is used to perform 64-bit multiplication for
devices with "32bit" or "f5series" hardware multiply versions:
64bit_result = (low32_op0 * lop32_op1)
+ ((low32_op0 * high32_op1) << 32)
+ ((high32_op0 * low32_op1) << 32)
libgcc/ChangeLog:
* config/msp430/lib2hw_mul.S (mult64_hw): New.
(if MUL_32): Use mult64_hw for __muldi3.
(if MUL_F5): Use mult64_hw for __muldi3.
* config/msp430/lib2mul.c (__muldi3): New.
* config/msp430/t-msp430 (LIB2FUNCS_EXCLUDE): Define.
89 lines
2.9 KiB
Plaintext
89 lines
2.9 KiB
Plaintext
# Makefile fragment for building LIBGCC for the TI MSP430 processor.
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# Copyright (C) 2011-2020 Free Software Foundation, Inc.
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# Contributed by Red Hat.
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#
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# This file is part of GCC.
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#
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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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#
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# GCC is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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# the GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public
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# License along with GCC; see the file COPYING3. If not see
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# <http://www.gnu.org/licenses/>.
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# Note - we have separate versions of the lib2div<mode> files
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# as the functions are quite large and we do not want to pull
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# in unneeded division routines.
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LIB2ADD = \
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$(srcdir)/config/msp430/lib2divQI.c \
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$(srcdir)/config/msp430/lib2divHI.c \
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$(srcdir)/config/msp430/lib2divSI.c \
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$(srcdir)/config/msp430/lib2bitcountHI.c \
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$(srcdir)/config/msp430/lib2mul.c \
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$(srcdir)/config/msp430/lib2shift.c \
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$(srcdir)/config/msp430/epilogue.S \
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$(srcdir)/config/msp430/slli.S \
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$(srcdir)/config/msp430/srai.S \
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$(srcdir)/config/msp430/srli.S \
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$(srcdir)/config/msp430/cmpsi2.S \
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$(srcdir)/config/msp430/floatunhisf.c \
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$(srcdir)/config/msp430/floatunhidf.c \
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$(srcdir)/config/msp430/floathidf.c \
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$(srcdir)/config/msp430/floathisf.c \
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$(srcdir)/config/msp430/cmpd.c
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# 32-bit and F5series hardware multiply have their own version of this function.
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# To handle the case when there is no hardware multiply or only 16-bit hardware
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# multiply, the libgcc version has been copied to lib2mul.c.
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LIB2FUNCS_EXCLUDE += _muldi3
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HOST_LIBGCC2_CFLAGS += -Os -ffunction-sections -fdata-sections -mhwmult=none
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crtbegin_no_eh.o: $(srcdir)/crtstuff.c
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$(crt_compile) -U__LIBGCC_EH_FRAME_SECTION_NAME__ -c $< -DCRT_BEGIN
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crtend_no_eh.o: $(srcdir)/crtstuff.c
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$(crt_compile) -U__LIBGCC_EH_FRAME_SECTION_NAME__ -c $< -DCRT_END
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mpy.o: $(srcdir)/config/msp430/mpy.c
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$(gcc_compile) $< -c
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lib2_mul_none.o: $(srcdir)/config/msp430/lib2mul.c
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$(gcc_compile) $< -c -DMUL_NONE
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lib2_mul_16bit.o: $(srcdir)/config/msp430/lib2mul.c
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$(gcc_compile) $< -c -DMUL_16
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lib2hw_mul_16.o: $(srcdir)/config/msp430/lib2hw_mul.S
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$(gcc_compile) $< -c -DMUL_16
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lib2hw_mul_32.o: $(srcdir)/config/msp430/lib2hw_mul.S
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$(gcc_compile) $< -c -DMUL_32
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lib2hw_mul_f5.o: $(srcdir)/config/msp430/lib2hw_mul.S
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$(gcc_compile) $< -c -DMUL_F5
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libmul_none.a: lib2_mul_none.o mpy.o
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$(AR_CREATE_FOR_TARGET) $@ $(filter %.o,$^)
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libmul_16.a: lib2hw_mul_16.o lib2_mul_16bit.o
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$(AR_CREATE_FOR_TARGET) $@ $(filter %.o,$^)
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libmul_32.a: lib2hw_mul_32.o
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$(AR_CREATE_FOR_TARGET) $@ $(filter %.o,$^)
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libmul_f5.a: lib2hw_mul_f5.o
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$(AR_CREATE_FOR_TARGET) $@ $(filter %.o,$^)
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# Local Variables:
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# mode: Makefile
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# End:
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