Build most libm-test support code once per type.

libm-test-driver.c contains various functions used in the course of
libm testing, which are built as part of each test using this
machinery.

Currently, these functions get built for three tests for each type
(e.g. test-float, test-ifloat, test-float-finite), plus the vector
function tests.  All these tests are huge and thus slow to build; the
output of gen-libm-test.pl totals around 40 MB across all functions.
To make the individual tests built from the Makefile smaller, it makes
sense to split these tests up so the tests for each function are built
separately (thus, three tests for each (function, type) pair, plus
vector tests built only for functions that actually have vector
versions).  This improves parallelism and means that if tests fail,
the summary of failed tests makes it more obvious where the problem
might be without needing to look in the .out files to see which
functions' tests failed (though architecture maintainers still need to
keep libm-test-ulps up to date to avoid spurious failures of little
interest).

Simply including libm-test-driver.c as-is in such individual-function
tests does not work because of unused static check_* functions (those
functions only being used for the types of the outputs of the function
under test).  It also means the common code gets built over 1000 times
instead of nine (plus vector tests).  To avoid that issue, this patch
splits out the bulk of the libm-test-driver.c code into a separate
file libm-test-support.c (with a few functions made non-static).  That
separate file is built only once for each floating-point type (so at
present three times, or twice on architectures with long double =
double).  Definitions needed in both libm-test-support.c and
libm-test-driver.c go in libm-test-support.h (it's possible some of
those are in fact only needed in one of the two files).
libm-test-driver.c keeps definitions of a limited number of variables
used to configure how libm-test-support.c behaves, various macros and
structures needed by individual-function tests, and the main function.

This move is also consistent in spirit with the move away from
test-skeleton.c having all the test support code, to a small
support/test-driver.c included in individual tests with most of the
code built separately.

Tested for x86_64 and x86.

	* math/libm-test-support.c: New file.  Content from
	math/libm-test-driver.c.
	* math/libm-test-support.h: Likewise.
	* math/libm-test-support-double.c: New file.
	* math/libm-test-support-float.c: Likewise.
	* math/libm-test-support-ldouble.c: Likewise.
	* math/libm-test-driver.c: Remove main comment and header
	includes.  Include libm-test-support.h.
	[!_GNU_SOURCE] (_GNU_SOURCE): Do not define.
	(flag_test_errno): Remove static.
	(flag_test_exceptions): Likewise.
	(flag_test_finite): Likewise.
	(flag_test_inline): Likewise.
	(flag_test_mathvec): Likewise.
	(test_msg): Likewise.
	(NO_EXCEPTION): Remove.
	(INVALID_EXCEPTION): Likewise.
	(DIVIDE_BY_ZERO_EXCEPTION): Likewise.
	(OVERFLOW_EXCEPTION): Likewise.
	(UNDERFLOW_EXCEPTION): Likewise.
	(INEXACT_EXCEPTION): Likewise.
	(INVALID_EXCEPTION_OK): Likewise.
	(DIVIDE_BY_ZERO_EXCEPTION_OK): Likewise.
	(OVERFLOW_EXCEPTION_OK): Likewise.
	(UNDERFLOW_EXCEPTION_OK): Likewise.
	(NO_INEXACT_EXCEPTION): Likewise.
	(EXCEPTIONS_OK): Likewise.
	(IGNORE_ZERO_INF_SIGN): Likewise.
	(TEST_NAN_SIGN): Likewise.
	(TEST_NAN_PAYLOAD): Likewise.
	(NO_TEST_INLINE): Likewise.
	(XFAIL_TEST): Likewise.
	(ERRNO_UNCHANGED): Likewise.
	(ERRNO_EDOM): Likewise.
	(ERRNO_ERANGE): Likewise.
	(IGNORE_RESULT): Likewise.
	(NON_FINITE): Likewise.
	(TEST_SNAN): Likewise.
	(NO_TEST_MATHVEC): Likewise.
	(__CONCATX): Likewise.
	(TYPE_MIN): Likewise.
	(TYPE_TRUE_MIN): Likewise.
	(TYPE_MAX): Likewise.
	(MIN_EXP): Likewise.
	(MAX_EXP): Likewise.
	(MANT_DIG): Likewise.
	(FSTR_MAX): Likewise.
	(ulp_idx): Likewise.
	(qtype_str): Remove static.
	(TEST_COND_binary32): Remove.
	(TEST_COND_binary64): Likewise.
	(TEST_COND_binary128): Likewise.
	(TEST_COND_ibm128): Likewise.
	(TEST_COND_intel96): Likewise.
	(TEST_COND_m68k96): Likewise.
	(TEST_COND_ibm128_libgcc): Likewise.
	(XFAIL_IBM128_LIBGCC): Likewise.
	(PAYLOAD_DIG): Likewise.
	(UNDERFLOW_EXCEPTION_FLOAT): Likewise.
	(UNDERFLOW_EXCEPTION_OK_FLOAT): Likewise.
	(UNDERFLOW_EXCEPTION_DOUBLE): Likewise.
	(UNDERFLOW_EXCEPTION_OK_DOUBLE): Likewise.
	(UNDERFLOW_EXCEPTION_LDOUBLE_IBM): Likewise.
	(UNDERFLOW_EXCEPTION_BEFORE_ROUNDING): Likewise.
	(TEST_COND_long32): Likewise.
	(TEST_COND_long64): Likewise.
	(TEST_COND_before_rounding): Likewise.
	(TEST_COND_after_rounding): Likewise.
	(ulps_file_name): Likewise.
	(ulps_file): Likewise.
	(output_ulps): Likewise.
	(output_dir): Likewise.
	(noErrors): Likewise.
	(noTests): Likewise.
	(noExcTests): Likewise.
	(noErrnoTests): Likewise.
	(verbose): Likewise.
	(output_max_error): Likewise.
	(output_points): Likewise.
	(ignore_max_ulp): Likewise.
	(max_error): Likewise.
	(real_max_error): Likewise.
	(imag_max_error): Likewise.
	(prev_max_error): Likewise.
	(prev_real_max_error): Likewise.
	(prev_imag_max_error): Likewise.
	(max_valid_error): Likewise.
	(TYPE_DECIMAL_DIG): Likewise.
	(TYPE_HEX_DIG): Likewise.
	(fmt_ftostr): Likewise.
	(compare_ulp_data): Likewise.
	(find_ulps): Likewise.
	(init_max_error): Likewise.
	(set_max_error): Likewise.
	(print_float): Likewise.
	(print_screen): Likewise.
	(print_screen_max_error): Likewise.
	(update_stats): Likewise.
	(print_function_ulps): Likewise.
	(print_complex_function_ulps): Likewise.
	(fpstack_test): Likewise.
	(print_max_error): Likewise.
	(print_complex_max_error): Likewise.
	(test_single_exception): Likewise.
	(test_exceptions): Likewise.
	(test_single_errno): Likewise.
	(test_errno): Likewise.
	(ULPDIFF): Likewise.
	(ulp): Likewise.
	(check_float_internal): Likewise.
	(check_float): Likewise.
	(check_complex): Likewise.
	(check_int): Likewise.
	(check_long): Likewise.
	(check_bool): Likewise.
	(check_longlong): Likewise.
	(check_intmax_t): Likewise.
	(check_uintmax_t): Likewise.
	(enable_test): Likewise.
	(matherr): Likewise.
	(initialize): Likewise.
	(options): Likewise.
	(doc): Remove static.
	(argp): Likewise.
	(parse_opt): Remove.
	(check_ulp): Likewise.
	(libm_test_init): Likewise.
	(libm_test_finish): Likewise.
	* math/Makefile (libm-test-support): New variable.
	(test-extras): Add libm-test-support files.
	(extra-test-objs): Likewise.
	(CFLAGS-libm-test-support-float.c): New variable.
	(CFLAGS-libm-test-support-double.c): Likewise.
	(CFLAGS-libm-test-support-ldouble.c): Likewise.
	($(addprefix $(objpfx),$(libm-tests)): Depend on appropriate
	libm-test-support objects.

1 files changed, 185 insertions, 0 deletions

diff --git a/math/libm-test-support.h b/math/libm-test-support.h
new file mode 100644
index 0000000000..5c9af04f1a
--- /dev/null
+++ b/math/libm-test-support.h
@@ -0,0 +1,185 @@
+/* Support code for testing libm functions (common declarations).
+   Copyright (C) 1997-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef LIBM_TEST_SUPPORT_H
+#define LIBM_TEST_SUPPORT_H 1
+
+#include <complex.h>
+#include <math.h>
+#include <float.h>
+#include <fenv.h>
+#include <limits.h>
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <tininess.h>
+#include <math-tests.h>
+#include <math-tests-arch.h>
+#include <nan-high-order-bit.h>
+
+extern const int flag_test_errno;
+extern const int flag_test_exceptions;
+extern const int flag_test_finite;
+extern const int flag_test_inline;
+extern const int flag_test_mathvec;
+extern const char test_msg[];
+extern const char qtype_str[];
+extern const char doc[];
+
+/* Possible exceptions */
+#define NO_EXCEPTION			0x0
+#define INVALID_EXCEPTION		0x1
+#define DIVIDE_BY_ZERO_EXCEPTION	0x2
+#define OVERFLOW_EXCEPTION		0x4
+#define UNDERFLOW_EXCEPTION		0x8
+#define INEXACT_EXCEPTION		0x10
+/* The next flags signals that those exceptions are allowed but not required.   */
+#define INVALID_EXCEPTION_OK		0x20
+#define DIVIDE_BY_ZERO_EXCEPTION_OK	0x40
+#define OVERFLOW_EXCEPTION_OK		0x80
+#define UNDERFLOW_EXCEPTION_OK		0x100
+/* For "inexact" exceptions, the default is allowed but not required
+   unless INEXACT_EXCEPTION or NO_INEXACT_EXCEPTION is specified.  */
+#define NO_INEXACT_EXCEPTION		0x200
+#define EXCEPTIONS_OK INVALID_EXCEPTION_OK+DIVIDE_BY_ZERO_EXCEPTION_OK
+/* Some special test flags, passed together with exceptions.  */
+#define IGNORE_ZERO_INF_SIGN		0x400
+#define TEST_NAN_SIGN			0x800
+#define TEST_NAN_PAYLOAD		0x1000
+#define NO_TEST_INLINE			0x2000
+#define XFAIL_TEST			0x4000
+/* Indicate errno settings required or disallowed.  */
+#define ERRNO_UNCHANGED			0x8000
+#define ERRNO_EDOM			0x10000
+#define ERRNO_ERANGE			0x20000
+/* Flags generated by gen-libm-test.pl, not entered here manually.  */
+#define IGNORE_RESULT			0x40000
+#define NON_FINITE			0x80000
+#define TEST_SNAN			0x100000
+#define NO_TEST_MATHVEC			0x200000
+
+#define __CONCATX(a,b) __CONCAT(a,b)
+
+#define TYPE_MIN __CONCATX (PREFIX, _MIN)
+#define TYPE_TRUE_MIN __CONCATX (PREFIX, _TRUE_MIN)
+#define TYPE_MAX __CONCATX (PREFIX, _MAX)
+#define MIN_EXP __CONCATX (PREFIX, _MIN_EXP)
+#define MAX_EXP __CONCATX (PREFIX, _MAX_EXP)
+#define MANT_DIG __CONCATX (PREFIX, _MANT_DIG)
+
+/* Format specific test macros.  */
+#define TEST_COND_binary32 (MANT_DIG == 24	\
+			    && MIN_EXP == -125	\
+			    && MAX_EXP == 128)
+
+#define TEST_COND_binary64 (MANT_DIG == 53	\
+			    && MIN_EXP == -1021	\
+			    && MAX_EXP == 1024)
+
+#define TEST_COND_binary128 (MANT_DIG == 113		\
+			     && MIN_EXP == -16381	\
+			     && MAX_EXP == 16384)
+
+#define TEST_COND_ibm128 (MANT_DIG == 106)
+
+#define TEST_COND_intel96 (MANT_DIG == 64	\
+			   && MIN_EXP == -16381	\
+			   && MAX_EXP == 16384)
+
+#define TEST_COND_m68k96 (MANT_DIG == 64	\
+			  && MIN_EXP == -16382	\
+			  && MAX_EXP == 16384)
+
+/* The condition ibm128-libgcc is used instead of ibm128 to mark tests
+   where in principle the glibc code is OK but the tests fail because
+   of limitations of the libgcc support for that format (e.g. GCC bug
+   59666, in non-default rounding modes).  */
+#define TEST_COND_ibm128_libgcc TEST_COND_ibm128
+
+/* Mark a test as expected to fail for ibm128-libgcc.  This is used
+   via XFAIL_ROUNDING_IBM128_LIBGCC, which gen-libm-test.pl transforms
+   appropriately for each rounding mode.  */
+#define XFAIL_IBM128_LIBGCC (TEST_COND_ibm128_libgcc ? XFAIL_TEST : 0)
+
+/* Number of bits in NaN payload.  */
+#if TEST_COND_ibm128
+# define PAYLOAD_DIG (DBL_MANT_DIG - 2)
+#else
+# define PAYLOAD_DIG (MANT_DIG - 2)
+#endif
+
+/* Values underflowing only for float.  */
+#if TEST_COND_binary32
+# define UNDERFLOW_EXCEPTION_FLOAT	UNDERFLOW_EXCEPTION
+# define UNDERFLOW_EXCEPTION_OK_FLOAT	UNDERFLOW_EXCEPTION_OK
+#else
+# define UNDERFLOW_EXCEPTION_FLOAT	0
+# define UNDERFLOW_EXCEPTION_OK_FLOAT	0
+#endif
+
+/* Values underflowing only for double or types with a larger least
+   positive normal value.  */
+#if TEST_COND_binary32 || TEST_COND_binary64 || TEST_COND_ibm128
+# define UNDERFLOW_EXCEPTION_DOUBLE	UNDERFLOW_EXCEPTION
+# define UNDERFLOW_EXCEPTION_OK_DOUBLE	UNDERFLOW_EXCEPTION_OK
+#else
+# define UNDERFLOW_EXCEPTION_DOUBLE	0
+# define UNDERFLOW_EXCEPTION_OK_DOUBLE	0
+#endif
+
+/* Values underflowing only for IBM long double or types with a larger least
+   positive normal value.  */
+#if TEST_COND_binary32 || TEST_COND_ibm128
+# define UNDERFLOW_EXCEPTION_LDOUBLE_IBM	UNDERFLOW_EXCEPTION
+#else
+# define UNDERFLOW_EXCEPTION_LDOUBLE_IBM	0
+#endif
+
+/* Values underflowing on architectures detecting tininess before
+   rounding, but not on those detecting tininess after rounding.  */
+#define UNDERFLOW_EXCEPTION_BEFORE_ROUNDING	(TININESS_AFTER_ROUNDING \
+						 ? 0			\
+						 : UNDERFLOW_EXCEPTION)
+
+#if LONG_MAX == 0x7fffffff
+# define TEST_COND_long32	1
+# define TEST_COND_long64	0
+#else
+# define TEST_COND_long32	0
+# define TEST_COND_long64	1
+#endif
+#define TEST_COND_before_rounding	(!TININESS_AFTER_ROUNDING)
+#define TEST_COND_after_rounding	TININESS_AFTER_ROUNDING
+
+int enable_test (int);
+void init_max_error (const char *, int);
+void print_max_error (const char *);
+void print_complex_max_error (const char *);
+void check_float (const char *, FLOAT, FLOAT, int);
+void check_complex (const char *, __complex__ FLOAT, __complex__ FLOAT, int);
+void check_int (const char *, int, int, int);
+void check_long (const char *, long int, long int, int);
+void check_bool (const char *, int, int, int);
+void check_longlong (const char *, long long int, long long int, int);
+void check_intmax_t (const char *, intmax_t, intmax_t, int);
+void check_uintmax_t (const char *, uintmax_t, uintmax_t, int);
+void libm_test_init (int, char **);
+int libm_test_finish (void);
+
+#endif /* LIBM_TEST_SUPPORT_H.  */