Add getpayload, getpayloadf, getpayloadl.

TS 18661-1 defines functions for manipulating the payloads of NaNs.
This patch implements the getpayload functions for glibc; these
extract the NaN payload (from an argument passed as a pointer, for
which corresponding libm-test support is added) and return it in the
same floating-point type.  The return value of these functions is
unspecified for non-NaN arguments; the patch does the simplest thing
to implement, which is that the functions do not check whether the
argument is a NaN and just treat the relevant bits of the
representation as a payload regardless.  A conversion from integer to
floating-point is used to produce the required return value, except in
the ldbl-128 case; as 128-bit integers are not supported for all
configurations using ldbl-128, the code constructs the required
floating-point representation of the return value directly instead.

Tested for x86_64, x86, mips64 and powerpc.

	* math/bits/mathcalls.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
	(getpayload): New declaration.
	* math/Versions (getpayload): New libm symbol at version
	GLIBC_2.25.
	(getpayloadf): Likewise.
	(getpayloadl): Likewise.
	* math/Makefile (libm-calls): Add s_getpayloadF.
	* math/libm-test.inc: Include <nan-high-order-bit.h>.
	(struct test_f_f_data): Add comment.
	(RUN_TEST_fp_f): New macro.
	(RUN_TEST_LOOP_fp_f): Likewise.
	(getpayload_test_data): New array.
	(getpayload_test): New function.
	(main): Call getpayload_test.
	* math/gen-libm-test.pl (parse_args): Handle 'p' in argument
	descriptor.
	* manual/arith.texi (FP Bit Twiddling): Document getpayload,
	getpayloadf and getpayloadl.
	* manual/libm-err-tab.pl: Update comment on interfaces without
	ulps tabulated.
	* sysdeps/ieee754/dbl-64/s_getpayload.c: New file.
	* sysdeps/ieee754/dbl-64/wordsize-64/s_getpayload.c: Likewise.
	* sysdeps/ieee754/flt-32/s_getpayloadf.c: Likewise.
	* sysdeps/ieee754/ldbl-128/s_getpayloadl.c: Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_getpayloadl.c: Likewise.
	* sysdeps/ieee754/ldbl-96/s_getpayloadl.c: Likewise.
	* sysdeps/nacl/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/aarch64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/alpha/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/arm/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/hppa/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/i386/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/ia64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/microblaze/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/nios2/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sh/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/tile/tilepro/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Likewise.

42 files changed, 491 insertions, 7 deletions

diff --git a/ChangeLog b/ChangeLog
index adc4df985d..9b226786af 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,65 @@
+2016-10-19  Joseph Myers  <joseph@codesourcery.com>
+
+	* math/bits/mathcalls.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
+	(getpayload): New declaration.
+	* math/Versions (getpayload): New libm symbol at version
+	GLIBC_2.25.
+	(getpayloadf): Likewise.
+	(getpayloadl): Likewise.
+	* math/Makefile (libm-calls): Add s_getpayloadF.
+	* math/libm-test.inc: Include <nan-high-order-bit.h>.
+	(struct test_f_f_data): Add comment.
+	(RUN_TEST_fp_f): New macro.
+	(RUN_TEST_LOOP_fp_f): Likewise.
+	(getpayload_test_data): New array.
+	(getpayload_test): New function.
+	(main): Call getpayload_test.
+	* math/gen-libm-test.pl (parse_args): Handle 'p' in argument
+	descriptor.
+	* manual/arith.texi (FP Bit Twiddling): Document getpayload,
+	getpayloadf and getpayloadl.
+	* manual/libm-err-tab.pl: Update comment on interfaces without
+	ulps tabulated.
+	* sysdeps/ieee754/dbl-64/s_getpayload.c: New file.
+	* sysdeps/ieee754/dbl-64/wordsize-64/s_getpayload.c: Likewise.
+	* sysdeps/ieee754/flt-32/s_getpayloadf.c: Likewise.
+	* sysdeps/ieee754/ldbl-128/s_getpayloadl.c: Likewise.
+	* sysdeps/ieee754/ldbl-128ibm/s_getpayloadl.c: Likewise.
+	* sysdeps/ieee754/ldbl-96/s_getpayloadl.c: Likewise.
+	* sysdeps/nacl/libm.abilist: Update.
+	* sysdeps/unix/sysv/linux/aarch64/libm.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/alpha/libm.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/arm/libm.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/hppa/libm.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/i386/libm.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/ia64/libm.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/microblaze/libm.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/mips/mips32/libm.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/nios2/libm.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist:
+	Likewise.
+	* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist:
+	Likewise.
+	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist:
+	Likewise.
+	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist:
+	Likewise.
+	* sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/sh/libm.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libm.abilist:
+	Likewise.
+	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libm.abilist:
+	Likewise.
+	* sysdeps/unix/sysv/linux/tile/tilepro/libm.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Likewise.
+
 2016-10-18  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
 
 	* sysdeps/unix/sysv/linux/Makefile [$(subdir) = math] (tests): Move
diff --git a/NEWS b/NEWS
index 5251242736..6439040a28 100644
--- a/NEWS
+++ b/NEWS
@@ -58,6 +58,8 @@ Version 2.25
   - Total order functions: totalorder, totalorderf, totalorderl,
     totalordermag, totalordermagf, totalordermagl.
 
+  - NaN functions: getpayload, getpayloadf, getpayloadl.
+
 * The <sys/quota.h> header now includes the <linux/quota.h> header.  Support
   for the Linux quota interface which predates kernel version 2.4.22 has
   been removed.
diff --git a/manual/arith.texi b/manual/arith.texi
index 282ca45e08..e53988a083 100644
--- a/manual/arith.texi
+++ b/manual/arith.texi
@@ -1854,6 +1854,26 @@ The argument @var{tagp} is used in an unspecified manner.  On @w{IEEE
 selects one.  On other systems it may do nothing.
 @end deftypefun
 
+@comment math.h
+@comment ISO
+@deftypefun double getpayload (const double *@var{x})
+@comment math.h
+@comment ISO
+@deftypefunx float getpayloadf (const float *@var{x})
+@comment math.h
+@comment ISO
+@deftypefunx {long double} getpayloadl (const long double *@var{x})
+@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
+IEEE 754 defines the @dfn{payload} of a NaN to be an integer value
+encoded in the representation of the NaN.  Payloads are typically
+propagated from NaN inputs to the result of a floating-point
+operation.  These functions, defined by TS 18661-1:2014, return the
+payload of the NaN pointed to by @var{x} (returned as a positive
+integer, or positive zero, represented as a floating-point number); if
+@var{x} is not a NaN, they return an unspecified value.  They raise no
+floating-point exceptions even for signaling NaNs.
+@end deftypefun
+
 @node FP Comparison Functions
 @subsection Floating-Point Comparison Functions
 @cindex unordered comparison
diff --git a/manual/libm-err-tab.pl b/manual/libm-err-tab.pl
index 102ff7b03a..59c53720b3 100755
--- a/manual/libm-err-tab.pl
+++ b/manual/libm-err-tab.pl
@@ -77,9 +77,10 @@ use vars qw (%results @all_floats %suffices @all_functions);
     "nextup", "pow", "remainder", "remquo", "rint", "round", "scalb",
     "scalbn", "sin", "sincos", "sinh", "sqrt", "tan", "tanh", "tgamma",
     "trunc", "y0", "y1", "yn" );
-# fpclassify, iscanonical, isnormal, isfinite, isinf, isnan, issignaling,
-# issubnormal, iszero, signbit, iseqsig, isgreater, isgreaterequal, isless,
-# islessequal, islessgreater, isunordered, totalorder, totalordermag
+# fpclassify, getpayload, iscanonical, isnormal, isfinite, isinf, isnan,
+# issignaling, issubnormal, iszero, signbit, iseqsig, isgreater,
+# isgreaterequal, isless, islessequal, islessgreater, isunordered,
+# totalorder, totalordermag
 # are not tabulated.
 
 if ($#ARGV == 0) {
diff --git a/math/Makefile b/math/Makefile
index 7c378fc5c3..2aa6a344e5 100644
--- a/math/Makefile
+++ b/math/Makefile
@@ -72,7 +72,8 @@ libm-calls =								  \
 	s_fmaF s_lrintF s_llrintF s_lroundF s_llroundF e_exp10F w_log2F	  \
 	s_issignalingF $(calls:s_%=m_%) x2y2m1F				  \
 	gamma_productF lgamma_negF lgamma_productF			  \
-	s_nextupF s_totalorderF s_totalordermagF $(gen-libm-calls)
+	s_nextupF s_totalorderF s_totalordermagF s_getpayloadF		  \
+	$(gen-libm-calls)
 
 libm-compat-calls-ldouble-yes = w_lgamma_compatl k_standardl
 libm-compat-calls = w_lgamma_compatf w_lgamma_compat k_standard k_standardf \
diff --git a/math/Versions b/math/Versions
index 67e826a40e..a2e0d900ad 100644
--- a/math/Versions
+++ b/math/Versions
@@ -219,5 +219,6 @@ libm {
     __iscanonicall; __iseqsigf; __iseqsig; __iseqsigl;
     totalorder; totalorderf; totalorderl;
     totalordermag; totalordermagf; totalordermagl;
+    getpayload; getpayloadf; getpayloadl;
   }
 }
diff --git a/math/bits/mathcalls.h b/math/bits/mathcalls.h
index 030130656c..c5853a325f 100644
--- a/math/bits/mathcalls.h
+++ b/math/bits/mathcalls.h
@@ -394,6 +394,9 @@ __MATHDECL_1 (int, totalorder,, (_Mdouble_ __x, _Mdouble_ __y))
 /* Total order operation on absolute values.  */
 __MATHDECL_1 (int, totalordermag,, (_Mdouble_ __x, _Mdouble_ __y))
      __attribute__ ((__const__));
+
+/* Get NaN payload.  */
+__MATHCALL (getpayload,, (const _Mdouble_ *__x));
 #endif
 
 #if defined __USE_MISC || (defined __USE_XOPEN_EXTENDED \
diff --git a/math/gen-libm-test.pl b/math/gen-libm-test.pl
index 4d02873c6f..25e69a8998 100755
--- a/math/gen-libm-test.pl
+++ b/math/gen-libm-test.pl
@@ -229,6 +229,10 @@ sub parse_args {
       ++$current_arg;
       next;
     }
+    # Argument passed via pointer.
+    if ($descr[$i] =~ /p/) {
+      next;
+    }
     # &FLOAT, &int - simplify call by not showing argument.
     if ($descr[$i] =~ /F|I/) {
       next;
@@ -294,8 +298,8 @@ sub parse_args {
       $current_arg++;
       next;
     }
-    # &FLOAT, &int
-    if ($descr[$i] =~ /F|I/) {
+    # &FLOAT, &int, argument passed via pointer
+    if ($descr[$i] =~ /F|I|p/) {
       next;
     }
     # complex
diff --git a/math/libm-test.inc b/math/libm-test.inc
index 91451bfa99..89e0e59638 100644
--- a/math/libm-test.inc
+++ b/math/libm-test.inc
@@ -45,7 +45,7 @@
    acos, acosh, asin, asinh, atan, atan2, atanh,
    cbrt, ceil, copysign, cos, cosh, drem, erf, erfc, exp, exp10, exp2, expm1,
    fabs, fdim, finite, floor, fma, fmax, fmin, fmod, fpclassify,
-   frexp, gamma, hypot,
+   frexp, gamma, getpayload, hypot,
    ilogb, iscanonical, isfinite, isinf, isnan, isnormal, issignaling,
    issubnormal, iszero, iseqsig, isless, islessequal, isgreater,
    isgreaterequal, islessgreater, isunordered, j0, j1, jn,
@@ -131,6 +131,7 @@
 #include <tininess.h>
 #include <math-tests.h>
 #include <math-tests-arch.h>
+#include <nan-high-order-bit.h>
 
 /* This header defines func_ulps, func_real_ulps and func_imag_ulps
    arrays.  */
@@ -1075,6 +1076,7 @@ enable_test (int exceptions)
 }
 
 /* Structures for each kind of test.  */
+/* Used for both RUN_TEST_LOOP_f_f and RUN_TEST_LOOP_fp_f.  */
 struct test_f_f_data
 {
   const char *arg_str;
@@ -1352,6 +1354,24 @@ struct test_fFF_11_data
 		    (ARRAY)[i].RM_##ROUNDING_MODE.expected,		\
 		    (ARRAY)[i].RM_##ROUNDING_MODE.exceptions);		\
   ROUND_RESTORE_ ## ROUNDING_MODE
+#define RUN_TEST_fp_f(ARG_STR, FUNC_NAME, ARG, EXPECTED,		\
+		     EXCEPTIONS)					\
+  do									\
+    if (enable_test (EXCEPTIONS))					\
+      {									\
+	COMMON_TEST_SETUP (ARG_STR);					\
+	check_float (test_name,	FUNC_TEST (FUNC_NAME) (&(ARG)),		\
+		     EXPECTED, EXCEPTIONS);				\
+	COMMON_TEST_CLEANUP;						\
+      }									\
+  while (0)
+#define RUN_TEST_LOOP_fp_f(FUNC_NAME, ARRAY, ROUNDING_MODE)		\
+  IF_ROUND_INIT_ ## ROUNDING_MODE					\
+    for (size_t i = 0; i < sizeof (ARRAY) / sizeof (ARRAY)[0]; i++)	\
+      RUN_TEST_fp_f ((ARRAY)[i].arg_str, FUNC_NAME, (ARRAY)[i].arg,	\
+		    (ARRAY)[i].RM_##ROUNDING_MODE.expected,		\
+		    (ARRAY)[i].RM_##ROUNDING_MODE.exceptions);		\
+  ROUND_RESTORE_ ## ROUNDING_MODE
 #define RUN_TEST_2_f(ARG_STR, FUNC_NAME, ARG1, ARG2, EXPECTED,	\
 		     EXCEPTIONS)				\
   do								\
@@ -8046,6 +8066,66 @@ frexp_test (void)
   ALL_RM_TEST (frexp, 1, frexp_test_data, RUN_TEST_LOOP_fI_f1, END, x);
 }
 
+
+static const struct test_f_f_data getpayload_test_data[] =
+  {
+    TEST_fp_f (getpayload, plus_infty, IGNORE, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_fp_f (getpayload, minus_infty, IGNORE, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_fp_f (getpayload, plus_zero, IGNORE, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_fp_f (getpayload, minus_zero, IGNORE, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_fp_f (getpayload, 1000, IGNORE, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+    TEST_fp_f (getpayload, max_value, IGNORE, NO_I