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powerpc64le: Enable support for IEEE long double

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On platforms where long double may have two different formats, i.e.: the
same format as double (64-bits) or something else (128-bits), building
with -mlong-double-128 is the default and function calls in the user
program match the name of the function in Glibc.  When building with
-mlong-double-64, Glibc installed headers redirect such calls to the
appropriate function.

Likewise, the internals of glibc are now built against IEEE long double.
However, the only (minimally) notable usage of long double is difftime.

Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
This commit is contained in:
Gabriel F. T. Gomes 2019-07-11 11:48:28 -03:00 committed by Paul E. Murphy
parent 5c7ccc2983
commit 051be01f6b
7 changed files with 232 additions and 0 deletions
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5
NEWS
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@ -18,6 +18,11 @@ Major new features:
* The GNU C Library now loads audit modules listed in the DT_AUDIT and
DT_DEPAUDIT dynamic section entries of the main executable.
* powerpc64le supports IEEE128 long double libm/libc redirects when
using the -mabi=ieeelongdouble to compile C code on supported GCC
toolchains. It is recommended to use GCC 8 or newer when testing
this option.
Deprecated and removed features, and other changes affecting compatibility:
* The deprecated <sys/sysctl.h> header and the sysctl function have been

4
sysdeps/powerpc/fpu/libm-test-ulps
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@ -1266,21 +1266,25 @@ ldouble: 1
Function: "gamma":
double: 3
float: 4
float128: 5
ldouble: 3
Function: "gamma_downward":
double: 4
float: 4
float128: 8
ldouble: 15
Function: "gamma_towardzero":
double: 4
float: 3
float128: 5
ldouble: 16
Function: "gamma_upward":
double: 4
float: 5
float128: 8
ldouble: 11
Function: "hypot":

1
sysdeps/powerpc/powerpc64/le/Implies-before
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@ -1,4 +1,5 @@
# On PowerPC we use the IBM extended long double format.
ieee754/ldbl-128ibm-compat
ieee754/ldbl-128ibm
ieee754/ldbl-opt
ieee754/dbl-64

4
sysdeps/powerpc/powerpc64/le/Makefile
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@ -20,6 +20,10 @@ no-gnu-attribute-CFLAGS = -mno-gnu-attribute
# We built an object file and extract the desired .gnu.attributes section
# to be inserted into lib{c,m}.so.
ifeq ($(build-shared),yes)
# Build everything with IEEE 128-bit long double.
sysdep-CFLAGS += -mabi=ieeelongdouble -Wno-psabi $(no-gnu-attribute-CFLAGS)
before-compile += $(common-objpfx)no_ldbl_gnu_attribute.bin
$(common-objpfx)no_ldbl_gnu_attribute.bin: $(..)sysdeps/powerpc/powerpc64/le/no_ldbl_gnu_attribute.c

8
sysdeps/unix/sysv/linux/powerpc/powerpc64/le/ldbl-128ibm-compat-abi.h Normal file
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@ -0,0 +1,8 @@
/* ABI version for long double switch to IEEE 128-bit floating point..
This is used by the Versions and math_ldbl_opt.h files in
sysdeps/ieee754/ldbl-128ibm-compat/. It gives the ABI version where
long double == ibm128 was replaced with long double == _Float128
for libm *l functions and libc functions using long double. */
#define LDBL_IBM128_VERSION GLIBC_2.32
#define LDBL_IBM128_COMPAT_VERSION GLIBC_2_32

93
sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
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@ -2248,4 +2248,97 @@ GLIBC_2.30 getdents64 F
GLIBC_2.30 gettid F
GLIBC_2.30 tgkill F
GLIBC_2.30 twalk_r F
GLIBC_2.32 __argp_errorieee128 F
GLIBC_2.32 __argp_failureieee128 F
GLIBC_2.32 __asprintf_chkieee128 F
GLIBC_2.32 __asprintfieee128 F
GLIBC_2.32 __dprintf_chkieee128 F
GLIBC_2.32 __dprintfieee128 F
GLIBC_2.32 __errieee128 F
GLIBC_2.32 __error_at_lineieee128 F
GLIBC_2.32 __errorieee128 F
GLIBC_2.32 __errxieee128 F
GLIBC_2.32 __fprintf_chkieee128 F
GLIBC_2.32 __fprintfieee128 F
GLIBC_2.32 __fscanfieee128 F
GLIBC_2.32 __fwprintf_chkieee128 F
GLIBC_2.32 __fwprintfieee128 F
GLIBC_2.32 __fwscanfieee128 F
GLIBC_2.32 __isoc99_fscanfieee128 F
GLIBC_2.32 __isoc99_fwscanfieee128 F
GLIBC_2.32 __isoc99_scanfieee128 F
GLIBC_2.32 __isoc99_sscanfieee128 F
GLIBC_2.32 __isoc99_swscanfieee128 F
GLIBC_2.32 __isoc99_vfscanfieee128 F
GLIBC_2.32 __isoc99_vfwscanfieee128 F
GLIBC_2.32 __isoc99_vscanfieee128 F
GLIBC_2.32 __isoc99_vsscanfieee128 F
GLIBC_2.32 __isoc99_vswscanfieee128 F
GLIBC_2.32 __isoc99_vwscanfieee128 F
GLIBC_2.32 __isoc99_wscanfieee128 F
GLIBC_2.32 __obstack_printf_chkieee128 F
GLIBC_2.32 __obstack_printfieee128 F
GLIBC_2.32 __obstack_vprintf_chkieee128 F
GLIBC_2.32 __obstack_vprintfieee128 F
GLIBC_2.32 __printf_chkieee128 F
GLIBC_2.32 __printf_sizeieee128 F
GLIBC_2.32 __printfieee128 F
GLIBC_2.32 __qecvtieee128 F
GLIBC_2.32 __qecvtieee128_r F
GLIBC_2.32 __qfcvtieee128 F
GLIBC_2.32 __qfcvtieee128_r F
GLIBC_2.32 __qgcvtieee128 F
GLIBC_2.32 __scanfieee128 F
GLIBC_2.32 __snprintf_chkieee128 F
GLIBC_2.32 __snprintfieee128 F
GLIBC_2.32 __sprintf_chkieee128 F
GLIBC_2.32 __sprintfieee128 F
GLIBC_2.32 __sscanfieee128 F
GLIBC_2.32 __strfmon_lieee128 F
GLIBC_2.32 __strfmonieee128 F
GLIBC_2.32 __strfromieee128 F
GLIBC_2.32 __strtoieee128 F
GLIBC_2.32 __strtoieee128_l F
GLIBC_2.32 __swprintf_chkieee128 F
GLIBC_2.32 __swprintfieee128 F
GLIBC_2.32 __swscanfieee128 F
GLIBC_2.32 __syslog_chkieee128 F
GLIBC_2.32 __syslogieee128 F
GLIBC_2.32 __vasprintf_chkieee128 F
GLIBC_2.32 __vasprintfieee128 F
GLIBC_2.32 __vdprintf_chkieee128 F
GLIBC_2.32 __vdprintfieee128 F
GLIBC_2.32 __verrieee128 F
GLIBC_2.32 __verrxieee128 F
GLIBC_2.32 __vfprintf_chkieee128 F
GLIBC_2.32 __vfprintfieee128 F
GLIBC_2.32 __vfscanfieee128 F
GLIBC_2.32 __vfwprintf_chkieee128 F
GLIBC_2.32 __vfwprintfieee128 F
GLIBC_2.32 __vfwscanfieee128 F
GLIBC_2.32 __vprintf_chkieee128 F
GLIBC_2.32 __vprintfieee128 F
GLIBC_2.32 __vscanfieee128 F
GLIBC_2.32 __vsnprintf_chkieee128 F
GLIBC_2.32 __vsnprintfieee128 F
GLIBC_2.32 __vsprintf_chkieee128 F
GLIBC_2.32 __vsprintfieee128 F
GLIBC_2.32 __vsscanfieee128 F
GLIBC_2.32 __vswprintf_chkieee128 F
GLIBC_2.32 __vswprintfieee128 F
GLIBC_2.32 __vswscanfieee128 F
GLIBC_2.32 __vsyslog_chkieee128 F
GLIBC_2.32 __vsyslogieee128 F
GLIBC_2.32 __vwarnieee128 F
GLIBC_2.32 __vwarnxieee128 F
GLIBC_2.32 __vwprintf_chkieee128 F
GLIBC_2.32 __vwprintfieee128 F
GLIBC_2.32 __vwscanfieee128 F
GLIBC_2.32 __warnieee128 F
GLIBC_2.32 __warnxieee128 F
GLIBC_2.32 __wcstoieee128 F
GLIBC_2.32 __wcstoieee128_l F
GLIBC_2.32 __wprintf_chkieee128 F
GLIBC_2.32 __wprintfieee128 F
GLIBC_2.32 __wscanfieee128 F
GLIBC_2.32 pthread_sigmask F

117
sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libm.abilist
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@ -1097,3 +1097,120 @@ GLIBC_2.31 totalordermagf32x F
GLIBC_2.31 totalordermagf64 F
GLIBC_2.31 totalordermagf64x F
GLIBC_2.31 totalordermagl F
GLIBC_2.32 __acoshieee128 F
GLIBC_2.32 __acosieee128 F
GLIBC_2.32 __asinhieee128 F
GLIBC_2.32 __asinieee128 F
GLIBC_2.32 __atan2ieee128 F
GLIBC_2.32 __atanhieee128 F
GLIBC_2.32 __atanieee128 F
GLIBC_2.32 __cabsieee128 F
GLIBC_2.32 __cacoshieee128 F
GLIBC_2.32 __cacosieee128 F
GLIBC_2.32 __canonicalizeieee128 F
GLIBC_2.32 __cargieee128 F
GLIBC_2.32 __casinhieee128 F
GLIBC_2.32 __casinieee128 F
GLIBC_2.32 __catanhieee128 F
GLIBC_2.32 __catanieee128 F
GLIBC_2.32 __cbrtieee128 F
GLIBC_2.32 __ccoshieee128 F
GLIBC_2.32 __ccosieee128 F
GLIBC_2.32 __ceilieee128 F
GLIBC_2.32 __cexpieee128 F
GLIBC_2.32 __cimagieee128 F
GLIBC_2.32 __clog10ieee128 F
GLIBC_2.32 __clogieee128 F
GLIBC_2.32 __conjieee128 F
GLIBC_2.32 __copysignieee128 F
GLIBC_2.32 __coshieee128 F
GLIBC_2.32 __cosieee128 F
GLIBC_2.32 __cpowieee128 F
GLIBC_2.32 __cprojieee128 F
GLIBC_2.32 __crealieee128 F
GLIBC_2.32 __csinhieee128 F
GLIBC_2.32 __csinieee128 F
GLIBC_2.32 __csqrtieee128 F
GLIBC_2.32 __ctanhieee128 F
GLIBC_2.32 __ctanieee128 F
GLIBC_2.32 __erfcieee128 F
GLIBC_2.32 __erfieee128 F
GLIBC_2.32 __exp10ieee128 F
GLIBC_2.32 __exp2ieee128 F
GLIBC_2.32 __expieee128 F
GLIBC_2.32 __expm1ieee128 F
GLIBC_2.32 __f32addieee128 F
GLIBC_2.32 __f32divieee128 F
GLIBC_2.32 __f32mulieee128 F
GLIBC_2.32 __f32subieee128 F
GLIBC_2.32 __f64addieee128 F
GLIBC_2.32 __f64divieee128 F
GLIBC_2.32 __f64mulieee128 F
GLIBC_2.32 __f64subieee128 F
GLIBC_2.32 __fabsieee128 F
GLIBC_2.32 __fdimieee128 F
GLIBC_2.32 __floorieee128 F
GLIBC_2.32 __fmaieee128 F
GLIBC_2.32 __fmaxieee128 F
GLIBC_2.32 __fmaxmagieee128 F
GLIBC_2.32 __fminieee128 F
GLIBC_2.32 __fminmagieee128 F
GLIBC_2.32 __fmodieee128 F
GLIBC_2.32 __frexpieee128 F
GLIBC_2.32 __fromfpieee128 F
GLIBC_2.32 __fromfpxieee128 F
GLIBC_2.32 __getpayloadieee128 F
GLIBC_2.32 __hypotieee128 F
GLIBC_2.32 __ilogbieee128 F
GLIBC_2.32 __j0ieee128 F
GLIBC_2.32 __j1ieee128 F
GLIBC_2.32 __jnieee128 F
GLIBC_2.32 __ldexpieee128 F
GLIBC_2.32 __lgammaieee128 F
GLIBC_2.32 __lgammaieee128_r F
GLIBC_2.32 __llogbieee128 F
GLIBC_2.32 __llrintieee128 F
GLIBC_2.32 __llroundieee128 F
GLIBC_2.32 __log10ieee128 F
GLIBC_2.32 __log1pieee128 F
GLIBC_2.32 __log2ieee128 F
GLIBC_2.32 __logbieee128 F
GLIBC_2.32 __logieee128 F
GLIBC_2.32 __lrintieee128 F
GLIBC_2.32 __lroundieee128 F
GLIBC_2.32 __modfieee128 F
GLIBC_2.32 __nanieee128 F
GLIBC_2.32 __nearbyintieee128 F
GLIBC_2.32 __nextafterieee128 F
GLIBC_2.32 __nextdownieee128 F
GLIBC_2.32 __nexttoward_to_ieee128 F
GLIBC_2.32 __nexttowardf_to_ieee128 F
GLIBC_2.32 __nexttowardieee128 F
GLIBC_2.32 __nextupieee128 F
GLIBC_2.32 __powieee128 F
GLIBC_2.32 __remainderieee128 F
GLIBC_2.32 __remquoieee128 F
GLIBC_2.32 __rintieee128 F
GLIBC_2.32 __roundevenieee128 F
GLIBC_2.32 __roundieee128 F
GLIBC_2.32 __scalbieee128 F
GLIBC_2.32 __scalblnieee128 F
GLIBC_2.32 __scalbnieee128 F
GLIBC_2.32 __setpayloadieee128 F
GLIBC_2.32 __setpayloadsigieee128 F
GLIBC_2.32 __significandieee128 F
GLIBC_2.32 __sincosieee128 F
GLIBC_2.32 __sinhieee128 F
GLIBC_2.32 __sinieee128 F
GLIBC_2.32 __sqrtieee128 F
GLIBC_2.32 __tanhieee128 F
GLIBC_2.32 __tanieee128 F
GLIBC_2.32 __tgammaieee128 F
GLIBC_2.32 __totalorderieee128 F
GLIBC_2.32 __totalordermagieee128 F
GLIBC_2.32 __truncieee128 F
GLIBC_2.32 __ufromfpieee128 F
GLIBC_2.32 __ufromfpxieee128 F
GLIBC_2.32 __y0ieee128 F
GLIBC_2.32 __y1ieee128 F
GLIBC_2.32 __ynieee128 F