2016-08-09 21:48:54 +00:00
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# When building float128 we need to ensure -mfloat128 is
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# passed to all such object files.
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2017-07-17 20:48:59 +00:00
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# libgcc requires __tcb_parse_hwcap_and_convert_at_platform when built with
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# a binary128 type. That symbol is provided by the loader on dynamically
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# linked executables, forcing to link the loader after libgcc link.
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f128-loader-link = $(as-needed) $(elf-objpfx)ld.so $(no-as-needed)
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2016-08-09 21:48:54 +00:00
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ifeq ($(subdir),math)
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# sqrtf128 requires emulation before POWER9.
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CPPFLAGS += -I../soft-fp
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# float128 requires adding a handful of extra flags.
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$(foreach suf,$(all-object-suffixes),%f128$(suf)): CFLAGS += -mfloat128
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$(foreach suf,$(all-object-suffixes),%f128_r$(suf)): CFLAGS += -mfloat128
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2017-06-27 18:41:12 +00:00
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$(foreach suf,$(all-object-suffixes),$(objpfx)test-float128%$(suf)): CFLAGS += -mfloat128
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$(foreach suf,$(all-object-suffixes),$(objpfx)test-ifloat128%$(suf)): CFLAGS += -mfloat128
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2016-08-09 21:48:54 +00:00
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CFLAGS-libm-test-support-float128.c += -mfloat128
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Add C++ versions of iscanonical for ldbl-96 and ldbl-128ibm (bug 22235)
All representations of floating-point numbers in types with IEC 60559
binary exchange format are canonical. On the other hand, types with IEC
60559 extended formats, such as those implemented under ldbl-96 and
ldbl-128ibm, contain representations that are not canonical.
TS 18661-1 introduced the type-generic macro iscanonical, which returns
whether a floating-point value is canonical or not. In Glibc, this
type-generic macro is implemented using the macro __MATH_TG, which, when
support for float128 is enabled, relies on __builtin_types_compatible_p
to select between floating-point types. However, this use of
iscanonical breaks C++ applications, because the builtin is only
available in C mode.
This patch provides a C++ implementation of iscanonical that relies on
function overloading, rather than builtins, to select between
floating-point types.
Unlike the C++ implementations for iszero and issignaling, this
implementation ignores __NO_LONG_DOUBLE_MATH. The double type always
matches IEC 60559 double format, which is always canonical. Thus, when
double and long double are the same (__NO_LONG_DOUBLE_MATH), iscanonical
always returns 1 and is not implemented with __MATH_TG.
Tested for powerpc64, powerpc64le and x86_64.
[BZ #22235]
* math/math.h: Trivial fix for unbalanced parentheses in comment.
* math/Makefile [CXX] (tests): Add test-math-iscanonical.cc.
(CFLAGS-test-math-iscanonical.cc): New variable.
* math/test-math-iscanonical.cc: New file.
* sysdeps/ieee754/ldbl-96/bits/iscanonical.h (iscanonical):
Provide a C++ implementation based on function overloading,
rather than using __MATH_TG, which uses C-only builtins.
* sysdeps/ieee754/ldbl-128ibm/bits/iscanonical.h (iscanonical):
Likewise.
* sysdeps/powerpc/powerpc64le/Makefile
(CFLAGS-test-math-iscanonical.cc): New variable.
2017-10-02 17:46:35 +00:00
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CFLAGS-test-math-iscanonical.cc += -mfloat128
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2017-08-14 16:46:15 +00:00
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CFLAGS-test-math-issignaling.cc += -mfloat128
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Provide a C++ version of iszero that does not use __MATH_TG (bug 21930)
When signaling nans are enabled (with -fsignaling-nans), the C++ version
of iszero uses the fpclassify macro, which is defined with __MATH_TG.
However, when support for float128 is available, __MATH_TG uses the
builtin __builtin_types_compatible_p, which is only available in C mode.
This patch refactors the C++ version of iszero so that it uses function
overloading to select between the floating-point types, instead of
relying on fpclassify and __MATH_TG.
Tested for powerpc64le, s390x, x86_64, and with build-many-glibcs.py.
[BZ #21930]
* math/math.h [defined __cplusplus && defined __SUPPORT_SNAN__]
(iszero): New C++ implementation that does not use
fpclassify/__MATH_TG/__builtin_types_compatible_p, when
signaling nans are enabled, since __builtin_types_compatible_p
is a C-only feature.
* math/test-math-iszero.cc: When __HAVE_DISTINCT_FLOAT128 is
defined, include ieee754_float128.h for access to the union and
member ieee854_float128.ieee.
[__HAVE_DISTINCT_FLOAT128] (do_test): Call check_float128.
[__HAVE_DISTINCT_FLOAT128] (check_float128): New function.
* sysdeps/powerpc/powerpc64le/Makefile [subdir == math]
(CXXFLAGS-test-math-iszero.cc): Add -mfloat128 to the build
options of test-math-zero on powerpc64le.
2017-08-22 19:34:42 +00:00
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CFLAGS-test-math-iszero.cc += -mfloat128
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$(objpfx)test-float128% $(objpfx)test-ifloat128% $(objpfx)test-math-iszero: \
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2017-07-17 20:48:59 +00:00
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gnulib-tests += $(f128-loader-link)
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2016-08-09 21:48:54 +00:00
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endif
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# Append flags to string <-> _Float128 routines.
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ifneq ($(filter $(subdir),wcsmbs stdlib),)
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2017-06-27 18:41:12 +00:00
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$(foreach suf,$(all-object-suffixes),%f128$(suf)): CFLAGS += -mfloat128
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$(foreach suf,$(all-object-suffixes),%f128_l$(suf)): CFLAGS += -mfloat128
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$(foreach suf,$(all-object-suffixes),%f128_nan$(suf)): CFLAGS += -mfloat128
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$(foreach suf,$(all-object-suffixes),%float1282mpn$(suf)): CFLAGS += -mfloat128
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$(foreach suf,$(all-object-suffixes),%mpn2float128$(suf)): CFLAGS += -mfloat128
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2016-08-09 21:48:54 +00:00
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CFLAGS-bug-strtod.c += -mfloat128
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CFLAGS-bug-strtod2.c += -mfloat128
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CFLAGS-tst-strtod-round.c += -mfloat128
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CFLAGS-tst-wcstod-round.c += -mfloat128
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2017-09-04 15:48:31 +00:00
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CFLAGS-tst-strtod-nan-locale.c += -mfloat128
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CFLAGS-tst-wcstod-nan-locale.c += -mfloat128
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2016-08-09 21:48:54 +00:00
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CFLAGS-tst-strtod6.c += -mfloat128
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CFLAGS-tst-strfrom.c += -mfloat128
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CFLAGS-tst-strfrom-locale.c += -mfloat128
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CFLAGS-strfrom-skeleton.c += -mfloat128
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2017-07-17 20:48:59 +00:00
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$(foreach test,bug-strtod bug-strtod2 bug-strtod2 tst-strtod-round \
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tst-wcstod-round tst-strtod6 tst-strrom tst-strfrom-locale \
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2017-09-04 15:48:31 +00:00
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tst-strtod-nan-locale tst-wcstod-nan-locale \
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2017-07-17 20:48:59 +00:00
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strfrom-skeleton,$(objpfx)$(test)): gnulib-tests += $(f128-loader-link)
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2016-08-09 21:48:54 +00:00
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# When building glibc with support for _Float128, the powers of ten tables in
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2017-06-27 18:41:12 +00:00
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# fpioconst.c and in the string conversion functions must be extended. Some
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# Makefiles (e.g.: wcsmbs/Makefile) override CFLAGS defined by the Makefiles in
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# sysdeps. This is avoided with the use sysdep-CFLAGS instead of CFLAGS.
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2016-08-09 21:48:54 +00:00
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sysdep-CFLAGS += $(sysdep-CFLAGS-$(<F))
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sysdep-CFLAGS-fpioconst.c += -mfloat128
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sysdep-CFLAGS-strtod_l.c += -mfloat128
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sysdep-CFLAGS-strtof_l.c += -mfloat128
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sysdep-CFLAGS-strtold_l.c += -mfloat128
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sysdep-CFLAGS-wcstod_l.c += -mfloat128
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sysdep-CFLAGS-wcstof_l.c += -mfloat128
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sysdep-CFLAGS-wcstold_l.c += -mfloat128
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endif
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# Append flags to printf routines.
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ifeq ($(subdir),stdio-common)
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CFLAGS-printf_fp.c = -mfloat128
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CFLAGS-printf_fphex.c = -mfloat128
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CFLAGS-printf_size.c = -mfloat128
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endif
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