Hello!
Attached patch enables soft-float multilibs for x86-32 RTEMS. The
patch activates SFmode and DFmode soft-float support routines. The
XFmode is mapped to DFmode due to lack of XFmode support in
soft-float. We already disable FPU return registers for -mno-80387, so
ABI is already changed for soft-float. The XFmode->DFmode mapping just
rides on this change.
gcc/
2013-11-05 Uros Bizjak <ubiz...@gmail.com>
* config/i386/i386-c.c (ix86_target_macros): Define _SOFT_FLOAT
for !TARGET_80387.
* config/i386/rtemself.h (TARGET_OS_CPP_BUILTINS): Do not define
_SOFT_FLOAT here.
(LONG_DOUBLE_TYPE_SIZE): New define.
(LIBGCC2_LONG_DOUBLE_TYPE_SIZE): Ditto.
libgcc/
2013-11-05 Uros Bizjak <ubiz...@gmail.com>
* config/i386/32/sfp-machine.h (_FP_MUL_MEAT_S): Define.
(_FP_MUL_MEAT_D): Ditto.
(_FP_DIV_MEAT_S): Ditto.
(_FP_DIV_MEAT_D): Ditto.
* config.host (i[34567]86-*-rtems*): Remove i386/t-softfp, add
t-softfp-sfdf and t-softfp to tmake_file.
Patch was tested by Ralf on RTEMS (currently, -march=pentiumpro
multilib ICEs during build due to PR 58853 [1]).
It should be relatively straightforward to implement x86-32 Android
soft-fp multilib following the above RTEMS example. Let's leave this
implementation to an interested reader ;)
Patch was committed to mainline SVN.
[1] http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58853
Uros.
Index: gcc/config/i386/i386-c.c
===================================================================
--- gcc/config/i386/i386-c.c (revision 204324)
+++ gcc/config/i386/i386-c.c (working copy)
@@ -467,6 +467,9 @@
builtin_define_std ("i386");
}
+ if (!TARGET_80387)
+ cpp_define (parse_in, "_SOFT_FLOAT");
+
if (TARGET_LONG_DOUBLE_64)
cpp_define (parse_in, "__LONG_DOUBLE_64__");
Index: gcc/config/i386/rtemself.h
===================================================================
--- gcc/config/i386/rtemself.h (revision 204324)
+++ gcc/config/i386/rtemself.h (working copy)
@@ -26,7 +26,15 @@
builtin_define ("__rtems__"); \
builtin_define ("__USE_INIT_FINI__"); \
builtin_assert ("system=rtems"); \
- if (!TARGET_80387) \
- builtin_define ("_SOFT_FLOAT"); \
} \
while (0)
+
+#undef LONG_DOUBLE_TYPE_SIZE
+#define LONG_DOUBLE_TYPE_SIZE (TARGET_80387 ? 80 : 64)
+
+#undef LIBGCC2_LONG_DOUBLE_TYPE_SIZE
+#ifdef _SOFT_FLOAT
+#define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 64
+#else
+#define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 80
+#endif
Index: gcc/config/i386/t-rtems
===================================================================
--- gcc/config/i386/t-rtems (revision 204324)
+++ gcc/config/i386/t-rtems (working copy)
@@ -17,9 +17,9 @@
# <http://www.gnu.org/licenses/>.
#
-MULTILIB_OPTIONS = mtune=i486/mtune=pentium/mtune=pentiumpro \
+MULTILIB_OPTIONS = mtune=i486/mtune=pentium \
msoft-float
-MULTILIB_DIRNAMES= m486 mpentium mpentiumpro soft-float
+MULTILIB_DIRNAMES= m486 mpentium soft-float
MULTILIB_MATCHES = msoft-float=mno-m80387
MULTILIB_MATCHES += mtune?pentium=mtune?k6 mtune?pentiumpro=mtune?mathlon
MULTILIB_EXCEPTIONS = \
Index: libgcc/config/i386/32/sfp-machine.h
===================================================================
--- libgcc/config/i386/32/sfp-machine.h (revision 204324)
+++ libgcc/config/i386/32/sfp-machine.h (working copy)
@@ -65,9 +65,15 @@
"g" ((USItype) (y0)))
+#define _FP_MUL_MEAT_S(R,X,Y) \
+ _FP_MUL_MEAT_1_wide(_FP_WFRACBITS_S,R,X,Y,umul_ppmm)
+#define _FP_MUL_MEAT_D(R,X,Y) \
+ _FP_MUL_MEAT_2_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
#define _FP_MUL_MEAT_Q(R,X,Y) \
_FP_MUL_MEAT_4_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
+#define _FP_DIV_MEAT_S(R,X,Y) _FP_DIV_MEAT_1_loop(S,R,X,Y)
+#define _FP_DIV_MEAT_D(R,X,Y) _FP_DIV_MEAT_2_udiv(D,R,X,Y)
#define _FP_DIV_MEAT_Q(R,X,Y) _FP_DIV_MEAT_4_udiv(Q,R,X,Y)
#define _FP_NANFRAC_S _FP_QNANBIT_S
Index: libgcc/config.host
===================================================================
--- libgcc/config.host (revision 204324)
+++ libgcc/config.host (working copy)
@@ -564,7 +564,7 @@
extra_parts=crtbegin.o
;;
i[34567]86-*-rtems*)
- tmake_file="$tmake_file i386/t-softfp i386/t-crtstuff"
+ tmake_file="$tmake_file i386/t-crtstuff t-softfp-sfdf t-softfp"
extra_parts="$extra_parts crti.o crtn.o"
;;
i[34567]86-*-solaris2* | x86_64-*-solaris2.1[0-9]*)
