libgcc/config/t-softfp

   1 # Copyright (C) 2006-2024 Free Software Foundation, Inc.
   2
   3 # This file is part of GCC.
   4
   5 # GCC is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 3, or (at your option)
   8 # any later version.
   9
  10 # GCC is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14
  15 # You should have received a copy of the GNU General Public License
  16 # along with GCC; see the file COPYING3.  If not see
  17 # <http://www.gnu.org/licenses/>.
  18
  19 # Targets using soft-fp should define the following variables:
  20 #
  21 # softfp_float_modes: a list of soft-float floating-point modes,
  22 #                     e.g. sf df
  23 # softfp_int_modes: a list of integer modes for which to define conversions,
  24 #                   e.g. si di
  25 # softfp_extensions: a list of extensions between floating-point modes,
  26 #                    e.g. sfdf
  27 # softfp_truncations: a list of truncations between floating-point modes,
  28 #                     e.g. dfsf
  29 #
  30 # Extensions and truncations should include those where only one mode
  31 # is a soft-float mode; for example, sftf where sf is hard-float and
  32 # tf is soft-float.
  33 #
  34 # If some additional functions should be built that are not implied by
  35 # the above settings, also define softfp_extras as a list of those
  36 # functions, e.g. unorddf2.
  37 #
  38 # If the functions should only be built as compat symbols for shared
  39 # libgcc, not available for new links, also define:
  40 #
  41 # softfp_compat := y
  42 #
  43 # If the libgcc2.c functions should not be replaced, also define:
  44 #
  45 # softfp_exclude_libgcc2 := y
  46 #
  47 # Avoiding replacing the libgcc2.c functions is a temporary measure
  48 # for targets with both hard-float and soft-float multilibs, since
  49 # these variables apply for all multilibs.  With toplevel libgcc,
  50 # soft-fp can be used conditionally on the multilib instead.
  51 #
  52 # If the code should not be compiled at all for some multilibs, define:
  53 #
  54 # softfp_wrap_start: text to put at the start of wrapper source files,
  55 #                    output with echo
  56 #                    e.g. '#ifndef __powerpc64__'
  57 # softfp_wrap_end: text to put at the end of wrapper source files,
  58 #                  e.g. '#endif'
  59 #
  60 # This is another temporary measure, and cannot be used together with
  61 # softfp_compat.
  62
  63 softfp_float_funcs = add$(m)3 div$(m)3 eq$(m)2 ge$(m)2 le$(m)2 mul$(m)3 \
  64   neg$(m)2 sub$(m)3 unord$(m)2
  65 softfp_floatint_funcs = fix$(m)$(i) fixuns$(m)$(i) \
  66   float$(i)$(m) floatun$(i)$(m)
  67 softfp_floatbitint_funcs = fix$(m)bitint floatbitint$(m)
  68 softfp_bid_list :=
  69 ifeq ($(decimal_float),yes)
  70 ifeq ($(enable_decimal_float),bid)
  71 softfp_bid_list += bitintpow10 \
  72                    $(foreach m,sd dd td,fix$(m)bitint floatbitint$(m) \
  73                                         fix$(m)ti fixuns$(m)ti \
  74                                         floatti$(m) floatunti$(m))
  75 endif
  76 endif
  77
  78 softfp_func_list := \
  79   $(foreach m,$(softfp_float_modes), \
  80               $(softfp_float_funcs) \
  81               $(foreach i,$(softfp_int_modes), \
  82                           $(softfp_floatint_funcs))) \
  83   $(foreach m,sf df,$(softfp_floatbitint_funcs)) \
  84   $(foreach e,$(softfp_extensions),extend$(e)2) \
  85   $(foreach t,$(softfp_truncations),trunc$(t)2) \
  86   $(softfp_extras)
  87
  88 ifeq ($(softfp_exclude_libgcc2),y)
  89 # This list is taken from mklibgcc.in and doesn't presently allow for
  90 # 64-bit targets where si should become di and di should become ti.
  91 softfp_func_list := $(filter-out floatdidf floatdisf fixunsdfsi fixunssfsi \
  92   fixunsdfdi fixdfdi fixunssfdi fixsfdi fixxfdi fixunsxfdi \
  93   floatdixf fixunsxfsi fixtfdi fixunstfdi floatditf \
  94   floatundidf floatundisf floatundixf floatunditf,$(softfp_func_list))
  95 endif
  96
  97 ifeq ($(softfp_compat),y)
  98 softfp_file_list := $(addsuffix .c,$(softfp_func_list))
  99
 100 ifeq ($(enable_shared),yes)
 101 softfp_map_dep := libgcc.map.in
 102 else
 103 softfp_map_dep :=
 104 endif
 105 softfp_set_symver = echo "asm (\".symver $(1),$(1)@`$(AWK) -f $(srcdir)/find-symver.awk -v symbol=$(1) libgcc.map.in`\");" >> $@
 106 $(softfp_file_list): $(softfp_map_dep)
 107         echo '#ifdef SHARED' > $@
 108         echo '#include "soft-fp/$@"' >> $@
 109 ifeq ($(enable_shared),yes)
 110         $(call softfp_set_symver,__$(*F))
 111         if grep strong_alias $(srcdir)/soft-fp/$@ > /dev/null; then \
 112           alias=`grep strong_alias $(srcdir)/soft-fp/$@ | sed -e 's/.*, *//' -e 's/).*//'`; \
 113           $(call softfp_set_symver,$$alias); \
 114         fi
 115 endif
 116         echo '#endif' >> $@
 117 else
 118 ifneq ($(softfp_wrap_start),)
 119 softfp_file_list := $(addsuffix .c,$(softfp_func_list))
 120
 121 $(softfp_file_list):
 122         echo $(softfp_wrap_start) > $@
 123         echo '#include "soft-fp/$@"' >> $@
 124         echo $(softfp_wrap_end) >> $@
 125 else
 126 softfp_file_list := \
 127   $(addsuffix .c,$(addprefix $(srcdir)/soft-fp/,$(softfp_func_list)))
 128 endif
 129 endif
 130 softfp_bid_file_list := \
 131   $(addsuffix .c,$(addprefix $(srcdir)/soft-fp/,$(softfp_bid_list)))
 132
 133 # Disable missing prototype and type limit warnings.  The prototypes
 134 # for the functions in the soft-fp files have not been brought across
 135 # from glibc.
 136
 137 soft-fp-objects-base = $(basename $(notdir $(softfp_file_list)))
 138
 139 soft-fp-objects = $(addsuffix $(objext), $(soft-fp-objects-base)) \
 140   $(addsuffix _s$(objext), $(soft-fp-objects-base))
 141
 142 $(soft-fp-objects) : INTERNAL_CFLAGS += -Wno-missing-prototypes -Wno-type-limits
 143
 144 LIB2ADD += $(softfp_file_list)
 145 LIB2ADD_ST += $(softfp_bid_file_list)
 146
 147 ifneq ($(softfp_exclude_libgcc2),y)
 148 # Functions in libgcc2.c are excluded for each soft-float mode (a
 149 # target may have both soft-float and hard-float modes), for the fixed
 150 # list of integer modes (si and di) for which libgcc2.c defines any
 151 # such functions.  Depending on the target, the si and di symbols may
 152 # in fact define di and ti functions.
 153
 154 LIB2FUNCS_EXCLUDE += \
 155   $(addprefix _,$(foreach m,$(softfp_float_modes), \
 156                             $(foreach i,si di, \
 157                                         $(softfp_floatint_funcs))))
 158 endif