Add iseqsig.

TS 18661-1 adds an iseqsig type-generic comparison macro to <math.h>.
This macro is like the == operator except that unordered operands
result in the "invalid" exception and errno being set to EDOM.

This patch implements this macro for glibc.  Given the need to set
errno, this is implemented with out-of-line functions __iseqsigf,
__iseqsig and __iseqsigl (of which the last only exists at all if long
double is ABI-distinct from double, so no function aliases or compat
support are needed).  The present patch ignores excess precision
issues; I intend to deal with those in a followup patch.  (Like
comparison operators, type-generic comparison macros should *not*
convert operands to their semantic types but should preserve excess
range and precision, meaning that for some argument types and values
of FLT_EVAL_METHOD, an underlying function should be called for a
wider type than that of the arguments.)

The underlying functions are implemented with the type-generic
template machinery.  Comparing x <= y && x >= y is sufficient in ISO C
to achieve an equality comparison with "invalid" raised for unordered
operands (and the results of those two comparisons can also be used to
tell whether errno needs to be set).  However, some architectures have
GCC bugs meaning that unordered comparison instructions are used
instead of ordered ones.  Thus, a mechanism is provided for
architectures to use an explicit call to feraiseexcept to raise
exceptions if required.  If your architecture has such a bug you
should add a fix-fp-int-compare-invalid.h header for it, with a
comment pointing to the relevant GCC bug report; if such a GCC bug is
fixed, that header's contents should have a __GNUC_PREREQ conditional
added so that the workaround can eventually be removed for that
architecture.

Tested for x86_64, x86, mips64, arm and powerpc.

	* math/math.h [__GLIBC_USE (IEC_60559_BFP_EXT)] (iseqsig): New
	macro.
	* math/bits/mathcalls.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
	(__iseqsig): New declaration.
	* math/s_iseqsig_template.c: New file.
	* math/Versions (__iseqsigf): New libm symbol at version
	GLIBC_2.25.
	(__iseqsig): Likewise.
	(__iseqsigl): Likewise.
	* math/libm-test.inc (iseqsig_test_data): New array.
	(iseqsig_test): New function.
	(main): Call iseqsig_test.
	* math/Makefile (gen-libm-calls): Add s_iseqsigF.
	* manual/arith.texi (FP Comparison Functions): Document iseqsig.
	* manual/libm-err-tab.pl: Update comment on interfaces without
	ulps tabulated.
	* sysdeps/generic/fix-fp-int-compare-invalid.h: New file.
	* sysdeps/powerpc/fpu/fix-fp-int-compare-invalid.h: Likewise.
	* sysdeps/x86/fpu/fix-fp-int-compare-invalid.h: 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.

30 files changed, 153 insertions, 0 deletions

diff --git a/sysdeps/generic/fix-fp-int-compare-invalid.h b/sysdeps/generic/fix-fp-int-compare-invalid.h
new file mode 100644
index 0000000000..42e3d1241b
--- /dev/null
+++ b/sysdeps/generic/fix-fp-int-compare-invalid.h
@@ -0,0 +1,27 @@
+/* Fix for missing "invalid" exceptions from floating-point
+   comparisons.  Generic version.
+   Copyright (C) 2016 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 FIX_FP_INT_COMPARE_INVALID_H
+#define FIX_FP_INT_COMPARE_INVALID_H	1
+
+/* Define this macro to 1 to work around ordered comparison operators
+   in C failing to raise the "invalid" exception for NaN operands.  */
+#define FIX_COMPARE_INVALID 0
+
+#endif /* fix-fp-int-compare-invalid.h */
diff --git a/sysdeps/nacl/libm.abilist b/sysdeps/nacl/libm.abilist
index 85ee684a1a..cdc65c3069 100644
--- a/sysdeps/nacl/libm.abilist
+++ b/sysdeps/nacl/libm.abilist
@@ -380,6 +380,8 @@ GLIBC_2.24 nextup F
 GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/powerpc/fpu/fix-fp-int-compare-invalid.h b/sysdeps/powerpc/fpu/fix-fp-int-compare-invalid.h
new file mode 100644
index 0000000000..cb2a272d72
--- /dev/null
+++ b/sysdeps/powerpc/fpu/fix-fp-int-compare-invalid.h
@@ -0,0 +1,28 @@
+/* Fix for missing "invalid" exceptions from floating-point
+   comparisons.  PowerPC version.
+   Copyright (C) 2016 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 FIX_FP_INT_COMPARE_INVALID_H
+#define FIX_FP_INT_COMPARE_INVALID_H	1
+
+/* As of GCC 5, comparisons use unordered comparison instructions when
+   they should use ordered comparisons
+   <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58684>.  */
+#define FIX_COMPARE_INVALID 1
+
+#endif /* fix-fp-int-compare-invalid.h */
diff --git a/sysdeps/unix/sysv/linux/aarch64/libm.abilist b/sysdeps/unix/sysv/linux/aarch64/libm.abilist
index aee63a105c..1ec00012c8 100644
--- a/sysdeps/unix/sysv/linux/aarch64/libm.abilist
+++ b/sysdeps/unix/sysv/linux/aarch64/libm.abilist
@@ -411,6 +411,9 @@ GLIBC_2.24 nextup F
 GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
+GLIBC_2.25 __iseqsigl F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/alpha/libm.abilist b/sysdeps/unix/sysv/linux/alpha/libm.abilist
index 339b896ac7..1edbb96e87 100644
--- a/sysdeps/unix/sysv/linux/alpha/libm.abilist
+++ b/sysdeps/unix/sysv/linux/alpha/libm.abilist
@@ -421,6 +421,9 @@ GLIBC_2.24 nextup F
 GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
+GLIBC_2.25 __iseqsigl F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/arm/libm.abilist b/sysdeps/unix/sysv/linux/arm/libm.abilist
index f7b824413b..26d9cc674b 100644
--- a/sysdeps/unix/sysv/linux/arm/libm.abilist
+++ b/sysdeps/unix/sysv/linux/arm/libm.abilist
@@ -69,6 +69,8 @@ GLIBC_2.24 nextup F
 GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/hppa/libm.abilist b/sysdeps/unix/sysv/linux/hppa/libm.abilist
index 576b514a53..a191cd8e0b 100644
--- a/sysdeps/unix/sysv/linux/hppa/libm.abilist
+++ b/sysdeps/unix/sysv/linux/hppa/libm.abilist
@@ -381,6 +381,8 @@ GLIBC_2.24 nextup F
 GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/i386/libm.abilist b/sysdeps/unix/sysv/linux/i386/libm.abilist
index 19e9792931..0a0383f016 100644
--- a/sysdeps/unix/sysv/linux/i386/libm.abilist
+++ b/sysdeps/unix/sysv/linux/i386/libm.abilist
@@ -424,6 +424,9 @@ GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
 GLIBC_2.25 __iscanonicall F
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
+GLIBC_2.25 __iseqsigl F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/ia64/libm.abilist b/sysdeps/unix/sysv/linux/ia64/libm.abilist
index 1a32e2c07d..017b0f9f7a 100644
--- a/sysdeps/unix/sysv/linux/ia64/libm.abilist
+++ b/sysdeps/unix/sysv/linux/ia64/libm.abilist
@@ -353,6 +353,9 @@ GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
 GLIBC_2.25 __iscanonicall F
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
+GLIBC_2.25 __iseqsigl F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist
index f7b824413b..26d9cc674b 100644
--- a/sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist
@@ -69,6 +69,8 @@ GLIBC_2.24 nextup F
 GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist
index 2a8cba458e..945d51e325 100644
--- a/sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist
@@ -422,6 +422,9 @@ GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
 GLIBC_2.25 __iscanonicall F
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
+GLIBC_2.25 __iseqsigl F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/microblaze/libm.abilist b/sysdeps/unix/sysv/linux/microblaze/libm.abilist
index c59437fe73..deb4189844 100644
--- a/sysdeps/unix/sysv/linux/microblaze/libm.abilist
+++ b/sysdeps/unix/sysv/linux/microblaze/libm.abilist
@@ -380,6 +380,8 @@ GLIBC_2.24 nextup F
 GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/libm.abilist b/sysdeps/unix/sysv/linux/mips/mips32/libm.abilist
index 31d6f9eb70..ceb12918e9 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/libm.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/libm.abilist
@@ -382,6 +382,8 @@ GLIBC_2.24 nextup F
 GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/libm.abilist b/sysdeps/unix/sysv/linux/mips/mips64/libm.abilist
index 83e031125b..003fe7b567 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/libm.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/libm.abilist
@@ -413,6 +413,9 @@ GLIBC_2.24 nextup F
 GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
+GLIBC_2.25 __iseqsigl F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/nios2/libm.abilist b/sysdeps/unix/sysv/linux/nios2/libm.abilist
index 151574d670..d57c3ebc1c 100644
--- a/sysdeps/unix/sysv/linux/nios2/libm.abilist
+++ b/sysdeps/unix/sysv/linux/nios2/libm.abilist
@@ -380,6 +380,8 @@ GLIBC_2.24 nextup F
 GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist
index 155daf5ecd..b22ec56740 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist
@@ -424,6 +424,9 @@ GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
 GLIBC_2.25 __fe_dfl_mode D 0x8
 GLIBC_2.25 __iscanonicall F
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
+GLIBC_2.25 __iseqsigl F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist
index 7b38632475..777a39d0e1 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist
@@ -423,6 +423,9 @@ GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
 GLIBC_2.25 __fe_dfl_mode D 0x8
 GLIBC_2.25 __iscanonicall F
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
+GLIBC_2.25 __iseqsigl F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist
index 26c8d41330..1b900c7144 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist
@@ -418,6 +418,9 @@ GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
 GLIBC_2.25 __fe_dfl_mode D 0x8
 GLIBC_2.25 __iscanonicall F
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
+GLIBC_2.25 __iseqsigl F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist
index 0e76e88f7b..0a8600e29d 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist
@@ -99,6 +99,9 @@ GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
 GLIBC_2.25 __fe_dfl_mode D 0x8
 GLIBC_2.25 __iscanonicall F
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
+GLIBC_2.25 __iseqsigl F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist
index 377cea952a..d7fff5327f 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist
@@ -411,6 +411,9 @@ GLIBC_2.24 nextup F
 GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
+GLIBC_2.25 __iseqsigl F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist
index dafbff15a6..4d682e604f 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist
@@ -409,6 +409,9 @@ GLIBC_2.24 nextup F
 GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
+GLIBC_2.25 __iseqsigl F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/sh/libm.abilist b/sysdeps/unix/sysv/linux/sh/libm.abilist
index a38baceb8f..0092b62a24 100644
--- a/sysdeps/unix/sysv/linux/sh/libm.abilist
+++ b/sysdeps/unix/sysv/linux/sh/libm.abilist
@@ -381,6 +381,8 @@ GLIBC_2.24 nextup F
 GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist
index 27166beb55..4ad593cbae 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist
@@ -414,6 +414,9 @@ GLIBC_2.24 nextup F
 GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
+GLIBC_2.25 __iseqsigl F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist
index 46f7973465..90a2bd57ed 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist
@@ -412,6 +412,9 @@ GLIBC_2.24 nextup F
 GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
+GLIBC_2.25 __iseqsigl F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libm.abilist b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libm.abilist
index ec6f0b3600..5d502c0bc8 100644
--- a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libm.abilist
+++ b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libm.abilist
@@ -381,6 +381,8 @@ GLIBC_2.24 nextup F
 GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libm.abilist b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libm.abilist
index ec6f0b3600..5d502c0bc8 100644
--- a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libm.abilist
+++ b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libm.abilist
@@ -381,6 +381,8 @@ GLIBC_2.24 nextup F
 GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/tile/tilepro/libm.abilist b/sysdeps/unix/sysv/linux/tile/tilepro/libm.abilist
index ec6f0b3600..5d502c0bc8 100644
--- a/sysdeps/unix/sysv/linux/tile/tilepro/libm.abilist
+++ b/sysdeps/unix/sysv/linux/tile/tilepro/libm.abilist
@@ -381,6 +381,8 @@ GLIBC_2.24 nextup F
 GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libm.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libm.abilist
index 1965316647..3364b0271d 100644
--- a/sysdeps/unix/sysv/linux/x86_64/64/libm.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/64/libm.abilist
@@ -413,6 +413,9 @@ GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
 GLIBC_2.25 __iscanonicall F
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
+GLIBC_2.25 __iseqsigl F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist
index 82207c9d70..6a3a3ce0ca 100644
--- a/sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist
@@ -412,6 +412,9 @@ GLIBC_2.24 nextupf F
 GLIBC_2.24 nextupl F
 GLIBC_2.25 GLIBC_2.25 A
 GLIBC_2.25 __iscanonicall F
+GLIBC_2.25 __iseqsig F
+GLIBC_2.25 __iseqsigf F
+GLIBC_2.25 __iseqsigl F
 GLIBC_2.25 fegetmode F
 GLIBC_2.25 fesetexcept F
 GLIBC_2.25 fesetmode F
diff --git a/sysdeps/x86/fpu/fix-fp-int-compare-invalid.h b/sysdeps/x86/fpu/fix-fp-int-compare-invalid.h
new file mode 100644
index 0000000000..6052280371
--- /dev/null
+++ b/sysdeps/x86/fpu/fix-fp-int-compare-invalid.h
@@ -0,0 +1,28 @@
+/* Fix for missing "invalid" exceptions from floating-point
+   comparisons.  x86 version.
+   Copyright (C) 2016 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 FIX_FP_INT_COMPARE_INVALID_H
+#define FIX_FP_INT_COMPARE_INVALID_H	1
+
+/* As of GCC 5, both x87 and SSE comparisons use unordered comparison
+   instructions when they should use ordered comparisons
+   <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52451>.  */
+#define FIX_COMPARE_INVALID 1
+
+#endif /* fix-fp-int-compare-invalid.h */