Vector expf for x86_64 and tests.

Here is implementation of vectorized expf containing SSE, AVX,
AVX2 and AVX512 versions according to Vector ABI
<https://groups.google.com/forum/#!topic/x86-64-abi/LmppCfN1rZ4>.

    * sysdeps/unix/sysv/linux/x86_64/libmvec.abilist: New symbols added.
    * sysdeps/x86/fpu/bits/math-vector.h: Added SIMD declaration and asm
    redirections for expf.
    * sysdeps/x86_64/fpu/Makefile (libmvec-support): Added new files.
    * sysdeps/x86_64/fpu/Versions: New versions added.
    * sysdeps/x86_64/fpu/libm-test-ulps: Regenerated.
    * sysdeps/x86_64/fpu/multiarch/Makefile (libmvec-sysdep_routines): Added
    build of SSE, AVX2 and AVX512 IFUNC versions.
    * sysdeps/x86_64/fpu/multiarch/svml_s_expf16_core.S: New file.
    * sysdeps/x86_64/fpu/multiarch/svml_s_expf16_core_avx512.S: New file.
    * sysdeps/x86_64/fpu/multiarch/svml_s_expf4_core.S: New file.
    * sysdeps/x86_64/fpu/multiarch/svml_s_expf4_core_sse4.S: New file.
    * sysdeps/x86_64/fpu/multiarch/svml_s_expf8_core.S: New file.
    * sysdeps/x86_64/fpu/multiarch/svml_s_expf8_core_avx2.S: New file.
    * sysdeps/x86_64/fpu/svml_s_expf16_core.S: New file.
    * sysdeps/x86_64/fpu/svml_s_expf4_core.S: New file.
    * sysdeps/x86_64/fpu/svml_s_expf8_core.S: New file.
    * sysdeps/x86_64/fpu/svml_s_expf8_core_avx.S: New file.
    * sysdeps/x86_64/fpu/svml_s_expf_data.S: New file.
    * sysdeps/x86_64/fpu/svml_s_expf_data.h: New file.
    * sysdeps/x86_64/fpu/test-float-vlen16-wrappers.c: Vector expf tests.
    * sysdeps/x86_64/fpu/test-float-vlen16.c: Likewise.
    * sysdeps/x86_64/fpu/test-float-vlen4-wrappers.c: Likewise.
    * sysdeps/x86_64/fpu/test-float-vlen4.c: Likewise.
    * sysdeps/x86_64/fpu/test-float-vlen8-avx2-wrappers.c: Likewise.
    * sysdeps/x86_64/fpu/test-float-vlen8-avx2.c: Likewise.
    * sysdeps/x86_64/fpu/test-float-vlen8-wrappers.c: Likewise.
    * sysdeps/x86_64/fpu/test-float-vlen8.c: Likewise.
    * NEWS: Mention addition of x86_64 vector expf.

1 files changed, 63 insertions, 0 deletions

diff --git a/sysdeps/x86_64/fpu/svml_s_expf_data.S b/sysdeps/x86_64/fpu/svml_s_expf_data.S
new file mode 100644
index 0000000000..eee9d69e31
--- /dev/null
+++ b/sysdeps/x86_64/fpu/svml_s_expf_data.S
@@ -0,0 +1,63 @@
+/* Data for function expf.
+   Copyright (C) 2014-2015 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/>.  */
+
+#include "svml_s_expf_data.h"
+
+	.section .rodata, "a"
+	.align 64
+
+/* Data table for vector implementations of function expf.
+   The table may contain polynomial, reduction, lookup coefficients and
+   other coefficients obtained through different methods of research and
+   experimental work.  */
+
+	.globl __svml_sexp_data
+__svml_sexp_data:
+
+/* Range reduction coefficients:
+ * log(2) inverted */
+float_vector __sInvLn2 0x3fb8aa3b
+
+/* right shifter constant */
+float_vector __sShifter 0x4b400000
+
+/* log(2) high part */
+float_vector __sLn2hi 0x3f317200
+
+/* log(2) low part */
+float_vector __sLn2lo 0x35bfbe8e
+
+/* bias */
+float_vector __iBias 0x0000007f
+
+/* Polynomial coefficients:
+ * Here we approximate 2^x on [-0.5, 0.5] */
+float_vector __sPC0 0x3f800000
+float_vector __sPC1 0x3f7ffffe
+float_vector __sPC2 0x3effff34
+float_vector __sPC3 0x3e2aacac
+float_vector __sPC4 0x3d2b8392
+float_vector __sPC5 0x3c07d9fe
+
+/* absolute value mask */
+float_vector __iAbsMask 0x7fffffff
+
+/* working domain range */
+float_vector __iDomainRange 0x42aeac4f
+	.type	__svml_sexp_data,@object
+	.size __svml_sexp_data,.-__svml_sexp_data