bc1b3a8840
Continuing the cleanups of libgcc soft-fp configuration for powerpc*-*-linux* in preparation for implementing TARGET_ATOMIC_ASSIGN_EXPAND_FENV for soft-float and e500, this patch optimizes the choice of which functions to build for the e500 cases. For e500v2, use of hardfp is generally right, except that calls to __unordsf2 and __unorddf2 are actually generated by GCC from __builtin_isunordered and so they need to be implemented with soft-fp to avoid recursively calling themselves. For e500v1, hardfp is right for SFmode (except for __unordsf2) but soft-fp for DFmode (and when using soft-fp, as usual it's best for the conversions between DFmode and integers all to come directly from soft-fp rather than some coming from libgcc2.c). Thus, new variables hardfp_exclusions and softfp_extras are added that configurations using t-hardfp and t-softfp can use to achieve the desired effect of selectively mixing the two sources of functions. Tested with no regressions for crosses to powerpc-linux-gnuspe (both e500v1 and e500v2); also checked that the same set of symbols and versions is exported from shared libgcc before and after the patch. * config/t-hardfp (hardfp_exclusions): Document new variable for user to define. (hardfp_func_list): Exclude functions from $(hardfp_exclusions). * config/t-softfp (softfp_extras): Document new variable for user to define. (softfp_func_list): Add functions from $(softfp_extras). * config/rs6000/t-e500v1-fp, config/rs6000/t-e500v2-fp: New files. * config.host (powerpc*-*-linux*): For e500v1, use rs6000/t-e500v1-fp and t-hardfp; do not use t-softfp-sfdf and t-softfp-excl. For e500v2, use t-hardfp-sfdf, rs6000/t-e500v2-fp and t-hardfp; do not use t-softfp-sfdf and t-softfp-excl. From-SVN: r216835
91 lines
3.9 KiB
Plaintext
91 lines
3.9 KiB
Plaintext
# 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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# For historical reasons, some targets provide a full set of FP routines
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# even if there is native hardware support for some of them. This file
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# is used to define functions that can be implemented directly in hardware.
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# For example, an __adddf3 defined by this file will use an FPU addition.
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#
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# The following variables should be set up before including this file:
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#
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# hardfp_float_modes: a list of hardware floating-point modes.
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# e.g. sf df
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# hardfp_int_modes: a list of integer modes for which to define conversions;
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# usually this is "si", since libgcc2.c provides routines
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# for wider modes
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# hardfp_extensions: a list of extensions between hardware floating-point modes,
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# e.g. sfdf
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# hardfp_truncations: a list of truncations between hardware floating-point
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# modes, e.g. dfsf
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#
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# If some functions that would otherwise be defined should not be
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# defined by this file (typically because the target would compile
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# certain operations into a call to the libgcc function, which thus
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# needs to be defined elsewhere to use software floating point), also
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# define hardfp_exclusions to be a list of those functions,
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# e.g. unorddf2.
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# Functions parameterized by a floating-point mode M.
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hardfp_func_bases := addM3 subM3 negM2 mulM3 divM3
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hardfp_func_bases += eqM2 neM2 geM2 gtM2 leM2 ltM2 unordM2
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# Functions parameterized by both a floating-point mode M and an integer mode N.
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hardfp_int_func_bases := fixMN floatNM floatunNM
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hardfp_func_bases += $(foreach n, $(hardfp_int_modes), \
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$(subst N,$(n),$(hardfp_int_func_bases)))
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# Get the full list of functions.
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hardfp_func_list := $(foreach m, $(hardfp_float_modes), \
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$(subst M,$(m),$(hardfp_func_bases)))
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hardfp_func_list += $(foreach pair, $(hardfp_extensions), \
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$(subst M,$(pair),extendM2))
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hardfp_func_list += $(foreach pair, $(hardfp_truncations), \
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$(subst M,$(pair),truncM2))
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hardfp_func_list := $(filter-out $(hardfp_exclusions),$(hardfp_func_list))
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# Regexp for matching a floating-point mode.
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hardfp_mode_regexp := $(shell echo $(hardfp_float_modes) | sed 's/ /\\|/g')
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# Regexp for matching the end of a function name, after the last
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# floating-point mode.
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hardfp_suffix_regexp := $(shell echo $(hardfp_int_modes) 2 3 | sed 's/ /\\|/g')
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# Add -D options to define:
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# FUNC: the function name (e.g. __addsf3)
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# OP: the function name without the leading __ and with the last
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# floating-point mode removed (e.g. add3)
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# TYPE: the last floating-point mode (e.g. sf)
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hardfp_defines_for = \
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$(shell echo $1 | \
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sed 's/\(.*\)\($(hardfp_mode_regexp)\)\($(hardfp_suffix_regexp)\|\)$$/-DFUNC=__& -DOP_\1\3 -DTYPE=\2/')
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hardfp-o = $(patsubst %,%$(objext),$(hardfp_func_list))
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$(hardfp-o): %$(objext): $(srcdir)/config/hardfp.c
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@echo "Mode = $(hardfp_mode_regexp)"
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@echo "Suffix = $(hardfp_suffix_regexp)"
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$(gcc_compile) $(call hardfp_defines_for, $*) -c $< $(vis_hide) -Wno-missing-prototypes
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libgcc-objects += $(hardfp-o)
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ifeq ($(enable_shared),yes)
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hardfp-s-o = $(patsubst %,%_s$(objext),$(hardfp_func_list))
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$(hardfp-s-o): %_s$(objext): $(srcdir)/config/hardfp.c
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$(gcc_s_compile) $(call hardfp_defines_for, $*) -c $< -Wno-missing-prototypes
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libgcc-s-objects += $(hardfp-s-o)
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endif
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