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This patch implements conversions between _Float128 and the 3 Decimal floating
types. It does this by extendending the dfp-bit conversions to add a new
binary floating point type (KF), and doing the conversions in the same manner
as the other binary/decimal conversions.
For conversions from _Float128 to Decimal, this patch uses a function
(__sprintfkf) instead of the sprintf function to convert long double values to
strings. The __sprintfkf function determines if GLIBC 2.32 or newer is used
and calls the IEEE 128-bit version of sprintf (__sprintfieee128). If the GLIBC
is earlier than 2.32, the code will convert _Float128 to __ibm128 and then use
the normal sprintf to convert this value.
For conversions from Decimal to _Float128, this patch uses a function
(__strtokf) instead of strtold to convert the strings from the Decimal
conversion to long double. The __strtokf function determines if GLIBC 2.32 or
newer is used, and if it is, calls the IEEE 128-bit version (__strtoieee128).
If the GLIBC is earlier than 2.32, the code will call strtold and convert the
__ibm128 value to _Float128.
These functions will primarily be used if/when the default PowerPC long double
type is changed to IEEE 128-bit, but they could also be used if the user
explicitly converts _Float128 to/from a Decimal type.
libgcc/
2021-02-22 Michael Meissner <meissner@linux.ibm.com>
* config/rs6000/_dd_to_kf.c: New file.
* config/rs6000/_kf_to_dd.c: New file.
* config/rs6000/_kf_to_sd.c: New file.
* config/rs6000/_kf_to_td.c: New file.
* config/rs6000/_sd_to_kf.c: New file.
* config/rs6000/_sprintfkf.c: New file.
* config/rs6000/_sprintfkf.h: New file.
* config/rs6000/_strtokf.h: New file.
* config/rs6000/_strtokf.c: New file.
* config/rs6000/_td_to_kf.c: New file.
* config/rs6000/quad-float128.h: Add new declarations.
* config/rs6000/t-float128 (fp128_dec_funcs): New macro.
(fp128_decstr_funcs): New macro.
(ibm128_dec_funcs): New macro.
(fp128_ppc_funcs): Add the new conversions.
(fp128_dec_objs): Force Decimal <-> __float128 conversions to be
compiled with -mabi=ieeelongdouble.
(fp128_decstr_objs): Force __float128 <-> string conversions to be
compiled with -mabi=ibmlongdouble.
(ibm128_dec_objs): Force Decimal <-> __float128 conversions to be
compiled with -mabi=ieeelongdouble.
(FP128_CFLAGS_DECIMAL): New macro.
(IBM128_CFLAGS_DECIMAL): New macro.
* dfp-bit.c (DFP_TO_BFP): Add PowerPC _Float128 support.
(BFP_TO_DFP): Add PowerPC _Float128 support.
* dfp-bit.h (BFP_KIND): Add new binary floating point kind for
IEEE 128-bit floating point.
(DFP_TO_BFP): Add PowerPC _Float128 support.
(BFP_TO_DFP): Add PowerPC _Float128 support.
(BFP_SPRINTF): New macro.
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gcc:
* config/dfp-bit.c, config/dfp-bit.h: Move to ../libgcc.
* config/t-dfprules: Move to ../libgcc/config.
* config.gcc (i[34567]86-*-linux*, i[34567]86-*-kfreebsd*-gnu,
i[34567]86-*-knetbsd*-gnu, i[34567]86-*-gnu*,
i[34567]86-*-kopensolaris*-gnu): Remove t-dfprules from tmake_file.
(x86_64-*-linux*, x86_64-*-kfreebsd*-gnu, x86_64-*-knetbsd*-gnu):
Likewise.
(i[34567]86-*-cygwin*): Likewise.
(i[34567]86-*-mingw*, x86_64-*-mingw*): Likewise.
(powerpc-*-linux*, powerpc64-*-linux*): Likewise.
* Makefile.in (D32PBIT_FUNCS, D64PBIT_FUNCS, D128PBIT_FUNCS): Remove.
(libgcc.mvars): Remove DFP_ENABLE, DFP_CFLAGS, D32PBIT_FUNCS,
D64PBIT_FUNCS, D128PBIT_FUNCS.
libgcc:
* dfp-bit.c, dfp-bit.h: New files.
* Makefile.in (D32PBIT_FUNCS, D64PBIT_FUNCS, D128PBIT_FUNCS): New
variables.
($(d32pbit-o)): Use $(srcdir) to refer to dfp-bit.c
($(d64pbit-o)): Likewise.
($(d128pbit-o)): Likewise.
* config/t-dfprules: New file.
* config.host (i[34567]86-*-linux*): Add t-dfprules to tmake_file.
(i[34567]86-*-kfreebsd*-gnu, i[34567]86-*-knetbsd*-gnu,
i[34567]86-*-gnu*, i[34567]86-*-kopensolaris*-gnu): Likewise.
(x86_64-*-linux*): Likewise.
(x86_64-*-kfreebsd*-gnu, x86_64-*-knetbsd*-gnu): Likewise.
(i[34567]86-*-cygwin*): Likewise.
(i[34567]86-*-mingw*, x86_64-*-mingw*): Likewise.
(powerpc-*-linux*, powerpc64-*-linux*): Likewise.
From-SVN: r176156
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