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powerpc64le: Enforce -mabi=ibmlongdouble when -mfloat128 used

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I have observed a bug on 7.4.0 whereby __mulkc3 calls are
swapped with __multc3 depending on ABI selection.  For the
sake of being overly cautious, build all _Float128 files
with ibm128 to workaround these compilers.  This has been
noted in GCC BZ 84914, and will not be fixed for GCC 7.

Likewise, non-math files built with _Float128 are assumed
to have ibm long double.  Explicilty preserve this
assumption.

Finally, add some bootstrapping code to avoid applying
these options until IEEE long double is enabled as they
require GCC 7 and above.

Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
This commit is contained in:
Paul E. Murphy 2020-02-07 14:08:12 -06:00
parent 25ee3931f0
commit 6f82d05034
2 changed files with 53 additions and 43 deletions
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88
sysdeps/powerpc/powerpc64/le/Makefile
View File

@ -1,5 +1,6 @@
# When building float128 we need to ensure -mfloat128 is # When building float128 we need to ensure -mfloat128 is
# passed to all such object files. # passed to all such object files.
type-float128-CFLAGS := -mfloat128
# Bootstrapping code for enabling IEEE 128. This can be removed and # Bootstrapping code for enabling IEEE 128. This can be removed and
# any indirections simplified once IEEE 128 long double is enabled. # any indirections simplified once IEEE 128 long double is enabled.
@ -11,28 +12,33 @@ type-ldouble-CFLAGS += $(ibm128-abi-CFLAGS)
no-gnu-attribute-CFLAGS = -mno-gnu-attribute no-gnu-attribute-CFLAGS = -mno-gnu-attribute
endif endif
# All _Float128 files should be built assuming an ibm128 long double.
# Likewise, this avoids some old GCC 7 compiler bugs whereby calls
# to __mulkc3 are swapped with __multc3, or worse. This is noted in
# GCC BZ 84914, and marked as will-not-fix.
type-float128-CFLAGS += $(type-ldouble-CFLAGS)
ifeq ($(subdir),math) ifeq ($(subdir),math)
# sqrtf128 requires emulation before POWER9. # sqrtf128 requires emulation before POWER9.
CPPFLAGS += -I../soft-fp CPPFLAGS += -I../soft-fp
# float128 requires adding a handful of extra flags. # float128 requires adding a handful of extra flags.
# Similarly, disable # Similarly, disable
$(foreach suf,$(all-object-suffixes),%f128$(suf)): CFLAGS += -mfloat128 $(no-gnu-attribute-CFLAGS) $(foreach suf,$(all-object-suffixes),%f128$(suf)): CFLAGS += $(type-float128-CFLAGS) $(no-gnu-attribute-CFLAGS)
$(foreach suf,$(all-object-suffixes),%f128_r$(suf)): CFLAGS += -mfloat128 $(no-gnu-attribute-CFLAGS) $(foreach suf,$(all-object-suffixes),%f128_r$(suf)): CFLAGS += $(type-float128-CFLAGS) $(no-gnu-attribute-CFLAGS)
$(foreach suf,$(all-object-suffixes),$(objpfx)test-float128%$(suf)): CFLAGS += -mfloat128 $(foreach suf,$(all-object-suffixes),$(objpfx)test-float128%$(suf)): CFLAGS += $(type-float128-CFLAGS)
$(foreach suf,$(all-object-suffixes),$(objpfx)test-float64x%$(suf)): CFLAGS += -mfloat128 $(foreach suf,$(all-object-suffixes),$(objpfx)test-float64x%$(suf)): CFLAGS += $(type-float128-CFLAGS)
# Pairs of types with _Float128 / _Float64x as the wider type but not # Pairs of types with _Float128 / _Float64x as the wider type but not
# the narrower one. # the narrower one.
f128-pairs = float32-float64x float32-float128 float64-float64x \ f128-pairs = float32-float64x float32-float128 float64-float64x \
float64-float128 float32x-float64x float32x-float128 float64-float128 float32x-float64x float32x-float128
$(foreach suf,$(all-object-suffixes),$(foreach pair,$(f128-pairs),$(objpfx)test-$(pair)%$(suf))): CFLAGS += -mfloat128 $(foreach suf,$(all-object-suffixes),$(foreach pair,$(f128-pairs),$(objpfx)test-$(pair)%$(suf))): CFLAGS += $(type-float128-CFLAGS)
CFLAGS-libm-test-support-float128.c += $(type-float128-CFLAGS)
CFLAGS-libm-test-support-float128.c += -mfloat128 CFLAGS-libm-test-support-float64x.c += $(type-float128-CFLAGS)
CFLAGS-libm-test-support-float64x.c += -mfloat128 CFLAGS-test-math-iscanonical.cc += $(type-float128-CFLAGS)
CFLAGS-test-math-iscanonical.cc += -mfloat128 CFLAGS-test-math-iseqsig.cc += $(type-float128-CFLAGS)
CFLAGS-test-math-iseqsig.cc += -mfloat128 CFLAGS-test-math-issignaling.cc += $(type-float128-CFLAGS)
CFLAGS-test-math-issignaling.cc += -mfloat128 CFLAGS-test-math-iszero.cc += $(type-float128-CFLAGS)
CFLAGS-test-math-iszero.cc += -mfloat128
CFLAGS-s_logbl-power7.c += $(type-ldouble-CFLAGS) CFLAGS-s_logbl-power7.c += $(type-ldouble-CFLAGS)
CFLAGS-s_logbl-ppc64.c += $(type-ldouble-CFLAGS) CFLAGS-s_logbl-ppc64.c += $(type-ldouble-CFLAGS)
@ -71,45 +77,49 @@ $(foreach suf,$(all-object-suffixes),\
): sysdep-CFLAGS := $(filter-out -mabi=ieeelongdouble,$(sysdep-CFLAGS)) ): sysdep-CFLAGS := $(filter-out -mabi=ieeelongdouble,$(sysdep-CFLAGS))
endif endif
# Append flags to string <-> _Float128 routines. # Append flags to string <-> _Float128 routines.
ifneq ($(filter $(subdir),wcsmbs stdlib),) ifneq ($(filter $(subdir),wcsmbs stdlib),)
$(foreach suf,$(all-object-suffixes),%f128$(suf)): CFLAGS += -mfloat128 $(no-gnu-attribute-CFLAGS) $(foreach suf,$(all-object-suffixes),%f128$(suf)): CFLAGS += $(type-float128-CFLAGS) $(no-gnu-attribute-CFLAGS)
$(foreach suf,$(all-object-suffixes),%f128_l$(suf)): CFLAGS += -mfloat128 $(no-gnu-attribute-CFLAGS) $(foreach suf,$(all-object-suffixes),%f128_l$(suf)): CFLAGS += $(type-float128-CFLAGS) $(no-gnu-attribute-CFLAGS)
$(foreach suf,$(all-object-suffixes),%f128_nan$(suf)): CFLAGS += -mfloat128 $(no-gnu-attribute-CFLAGS) $(foreach suf,$(all-object-suffixes),%f128_nan$(suf)): CFLAGS += $(type-float128-CFLAGS) $(no-gnu-attribute-CFLAGS)
$(foreach suf,$(all-object-suffixes),%float1282mpn$(suf)): CFLAGS += -mfloat128 $(no-gnu-attribute-CFLAGS) $(foreach suf,$(all-object-suffixes),%float1282mpn$(suf)): CFLAGS += $(type-float128-CFLAGS) $(no-gnu-attribute-CFLAGS)
$(foreach suf,$(all-object-suffixes),%mpn2float128$(suf)): CFLAGS += -mfloat128 $(no-gnu-attribute-CFLAGS) $(foreach suf,$(all-object-suffixes),%mpn2float128$(suf)): CFLAGS += $(type-float128-CFLAGS) $(no-gnu-attribute-CFLAGS)
CFLAGS-bug-strtod.c += -mfloat128 CFLAGS-bug-strtod.c += $(type-float128-CFLAGS)
CFLAGS-bug-strtod2.c += -mfloat128 CFLAGS-bug-strtod2.c += $(type-float128-CFLAGS)
CFLAGS-tst-strtod-round.c += -mfloat128 CFLAGS-tst-strtod-round.c += $(type-float128-CFLAGS)
CFLAGS-tst-wcstod-round.c += -mfloat128 CFLAGS-tst-wcstod-round.c += $(type-float128-CFLAGS)
CFLAGS-tst-strtod-nan-locale.c += -mfloat128 CFLAGS-tst-strtod-nan-locale.c += $(type-float128-CFLAGS)
CFLAGS-tst-wcstod-nan-locale.c += -mfloat128 CFLAGS-tst-wcstod-nan-locale.c += $(type-float128-CFLAGS)
CFLAGS-tst-strtod6.c += -mfloat128 CFLAGS-tst-strtod6.c += $(type-float128-CFLAGS)
CFLAGS-tst-strfrom.c += -mfloat128 CFLAGS-tst-strfrom.c += $(type-float128-CFLAGS)
CFLAGS-tst-strfrom-locale.c += -mfloat128 CFLAGS-tst-strfrom-locale.c += $(type-float128-CFLAGS)
CFLAGS-strfrom-skeleton.c += -mfloat128 CFLAGS-strfrom-skeleton.c += $(type-float128-CFLAGS)
CFLAGS-tst-strtod-nan-sign.c += -mfloat128 CFLAGS-tst-strtod-nan-sign.c += $(type-float128-CFLAGS)
CFLAGS-tst-wcstod-nan-sign.c += -mfloat128 CFLAGS-tst-wcstod-nan-sign.c += $(type-float128-CFLAGS)
# When building glibc with support for _Float128, the powers of ten tables in # When building glibc with support for _Float128, the powers of ten tables in
# fpioconst.c and in the string conversion functions must be extended. Some # fpioconst.c and in the string conversion functions must be extended. Some
# Makefiles (e.g.: wcsmbs/Makefile) override CFLAGS defined by the Makefiles in # Makefiles (e.g.: wcsmbs/Makefile) override CFLAGS defined by the Makefiles in
# sysdeps. This is avoided with the use sysdep-CFLAGS instead of CFLAGS. # sysdeps. This is avoided with the use sysdep-CFLAGS instead of CFLAGS.
sysdep-CFLAGS += $(sysdep-CFLAGS-$(<F)) sysdep-CFLAGS += $(sysdep-CFLAGS-$(<F))
sysdep-CFLAGS-fpioconst.c += -mfloat128 sysdep-CFLAGS-fpioconst.c += $(type-float128-CFLAGS)
sysdep-CFLAGS-strtod_l.c += -mfloat128 sysdep-CFLAGS-strtod_l.c += $(type-float128-CFLAGS)
sysdep-CFLAGS-strtof_l.c += -mfloat128 sysdep-CFLAGS-strtof_l.c += $(type-float128-CFLAGS)
sysdep-CFLAGS-strtold_l.c += -mfloat128 sysdep-CFLAGS-strtold_l.c += $(type-float128-CFLAGS)
sysdep-CFLAGS-wcstod_l.c += -mfloat128 sysdep-CFLAGS-wcstod_l.c += $(type-float128-CFLAGS)
sysdep-CFLAGS-wcstof_l.c += -mfloat128 sysdep-CFLAGS-wcstof_l.c += $(type-float128-CFLAGS)
sysdep-CFLAGS-wcstold_l.c += -mfloat128 sysdep-CFLAGS-wcstold_l.c += $(type-float128-CFLAGS)
# Build any ibm128 specific stdlib tests with ibm128 ABI.
$(foreach suf,$(all-object-suffixes),%128ibm$(suf)): CFLAGS += $(type-ldouble-CFLAGS)
endif endif
# Append flags to printf routines. # Append flags to printf routines.
ifeq ($(subdir),stdio-common) ifeq ($(subdir),stdio-common)
CFLAGS-printf_fp.c = -mfloat128 CFLAGS-printf_fp.c = $(type-float128-CFLAGS)
CFLAGS-printf_fphex.c = -mfloat128 CFLAGS-printf_fphex.c = $(type-float128-CFLAGS)
CFLAGS-printf_size.c = -mfloat128 CFLAGS-printf_size.c = $(type-float128-CFLAGS)
endif endif
# Disable linker noise on files using ieee128 long double internally # Disable linker noise on files using ieee128 long double internally

8
sysdeps/powerpc/powerpc64/le/fpu/multiarch/Makefile
View File

@ -2,9 +2,9 @@ ifeq ($(subdir),math)
libm-sysdep_routines += s_fmaf128-ppc64 s_fmaf128-power9 \ libm-sysdep_routines += s_fmaf128-ppc64 s_fmaf128-power9 \
w_sqrtf128-power9 w_sqrtf128-ppc64le w_sqrtf128-power9 w_sqrtf128-ppc64le
CFLAGS-s_fmaf128-ppc64.c += -mfloat128 $(no-gnu-attribute-CFLAGS) CFLAGS-s_fmaf128-ppc64.c += $(type-float128-CFLAGS) $(no-gnu-attribute-CFLAGS)
CFLAGS-s_fmaf128-power9.c += -mfloat128 -mcpu=power9 $(no-gnu-attribute-CFLAGS) CFLAGS-s_fmaf128-power9.c += $(type-float128-CFLAGS) -mcpu=power9 $(no-gnu-attribute-CFLAGS)
CFLAGS-w_sqrtf128-ppc64le.c += -mfloat128 $(no-gnu-attribute-CFLAGS) CFLAGS-w_sqrtf128-ppc64le.c += $(type-float128-CFLAGS) $(no-gnu-attribute-CFLAGS)
CFLAGS-w_sqrtf128-power9.c += -mfloat128 -mcpu=power9 $(no-gnu-attribute-CFLAGS) CFLAGS-w_sqrtf128-power9.c += $(type-float128-CFLAGS) -mcpu=power9 $(no-gnu-attribute-CFLAGS)
endif endif