gcc/libgcc/config/t-hardfp

# Copyright (C) 2014-2022 Free Software Foundation, Inc.

# This file is part of GCC.

# GCC is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.

# GCC is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with GCC; see the file COPYING3.  If not see
# <http://www.gnu.org/licenses/>.

# For historical reasons, some targets provide a full set of FP routines
# even if there is native hardware support for some of them.  This file
# is used to define functions that can be implemented directly in hardware.
# For example, an __adddf3 defined by this file will use an FPU addition.
#
# The following variables should be set up before including this file:
#
# hardfp_float_modes: a list of hardware floating-point modes.
#                     e.g. sf df
# hardfp_int_modes: a list of integer modes for which to define conversions;
#		    usually this is "si", since libgcc2.c provides routines
#		    for wider modes
# hardfp_extensions: a list of extensions between hardware floating-point modes,
#                    e.g. sfdf
# hardfp_truncations: a list of truncations between hardware floating-point
#                     modes, e.g. dfsf
#
# If some functions that would otherwise be defined should not be
# defined by this file (typically because the target would compile
# certain operations into a call to the libgcc function, which thus
# needs to be defined elsewhere to use software floating point), also
# define hardfp_exclusions to be a list of those functions,
# e.g. unorddf2.

# Functions parameterized by a floating-point mode M.
hardfp_func_bases := addM3 subM3 negM2 mulM3 divM3
hardfp_func_bases += eqM2 neM2 geM2 gtM2 leM2 ltM2 unordM2

# Functions parameterized by both a floating-point mode M and an integer mode N.
hardfp_int_func_bases := fixMN floatNM floatunNM
hardfp_func_bases += $(foreach n, $(hardfp_int_modes), \
			       $(subst N,$(n),$(hardfp_int_func_bases)))

# Get the full list of functions.
hardfp_func_list := $(foreach m, $(hardfp_float_modes), \
	      	 	      $(subst M,$(m),$(hardfp_func_bases)))
hardfp_func_list += $(foreach pair, $(hardfp_extensions), \
		    	      $(subst M,$(pair),extendM2))
hardfp_func_list += $(foreach pair, $(hardfp_truncations), \
		    	      $(subst M,$(pair),truncM2))

hardfp_func_list := $(filter-out $(hardfp_exclusions),$(hardfp_func_list))

# Regexp for matching a floating-point mode.
hardfp_mode_regexp := $(shell echo $(hardfp_float_modes) | sed 's/ /\\|/g')

# Regexp for matching the end of a function name, after the last
# floating-point mode.
hardfp_suffix_regexp := $(shell echo $(hardfp_int_modes) 2 3 | sed 's/ /\\|/g')

# Add -D options to define:
#   FUNC: the function name (e.g. __addsf3)
#   OP:   the function name without the leading __ and with the last
#            floating-point mode removed (e.g. add3)
#   TYPE: the last floating-point mode (e.g. sf)
hardfp_defines_for = \
  $(shell echo $1 | \
    sed 's/\(.*\)\($(hardfp_mode_regexp)\)\($(hardfp_suffix_regexp)\|\)$$/-DFUNC=__& -DOP_\1\3 -DTYPE=\2/')

hardfp-o = $(patsubst %,%$(objext),$(hardfp_func_list))
$(hardfp-o): %$(objext): $(srcdir)/config/hardfp.c
	@echo "Mode = $(hardfp_mode_regexp)"
	@echo "Suffix = $(hardfp_suffix_regexp)"
	$(gcc_compile) $(call hardfp_defines_for, $*) -c $< $(vis_hide) -Wno-missing-prototypes
libgcc-objects += $(hardfp-o)

ifeq ($(enable_shared),yes)
hardfp-s-o = $(patsubst %,%_s$(objext),$(hardfp_func_list))
$(hardfp-s-o): %_s$(objext): $(srcdir)/config/hardfp.c
	$(gcc_s_compile) $(call hardfp_defines_for, $*) -c $< -Wno-missing-prototypes
libgcc-s-objects += $(hardfp-s-o)
endif