The implementation is in assembly and just calls the scalar math code.
This ensures that old compiler without vector call abi support can
build libmvec. The abi is supported since GCC 9.1, the specification is
https://developer.arm.com/tools-and-software/server-and-hpc/arm-architecture-tools/arm-compiler-for-hpc/vector-function-abi
Vector functions require a STO_AARCH64_VARIANT_PCS marking in the
dynamic symbol table for lazy bound calls to work. This will be
missing in libmvec, which works because the marking only affects
the behaviour if there are calls to the symbols in the binary.
Testing requires vector call abi support, which is detected.
Header declarations are not added yet, so the symbols will not be used
by the compiler: they are just added so the abi is in place which
enables backporting later. Currently we cannot add correct declarations
that only declare the specific symbols we provide: the OpenMP pragma
mechanism would declare both AdvSIMD and SVE variants.
2019-07-15 Steve Ellcey <sellcey@marvell.com>
Szabolcs Nagy <szabolcs.nagy@arm.com>
* sysdeps/aarch64/configure.ac (build_mathvec): Enable.
(test-mathvec): Enable if ABI is supported.
* sysdeps/aarch64/configure: Regenerate.
* sysdeps/aarch64/fpu/Makefile
(libmvec-support): Add libmvec_double_vlen2_exp,
libmvec_float_vlen4_expf to list.
(libmvec_nonshared.a): Use make-dummy-lib.
(libmvec-tests): Add double-vlen2, float-vlen4 to list.
(double-vlen2-funcs): Add new vector function name.
(float-vlen4-funcs): Add new vector function name.
* sysdeps/aarch64/fpu/Versions: New file.
* sysdeps/aarch64/fpu/libmvec_double_vlen2.h: New file.
* sysdeps/aarch64/fpu/libmvec_double_vlen2_exp.S: New file.
* sysdeps/aarch64/fpu/libmvec_float_vlen4.h: New file.
* sysdeps/aarch64/fpu/libmvec_float_vlen4_expf.S: New file.
* sysdeps/aarch64/fpu/test-double-vlen2-wrappers.c: New file.
* sysdeps/aarch64/fpu/test-float-vlen4-wrappers.c: New file.
* sysdeps/aarch64/libm-test-ulps (exp_vlen2): New entry.
(exp_vlen4): Likewise.
* sysdeps/unix/sysv/linux/aarch64/libmvec.abilist: New file.
config_vars="$config_vars
default-abi = lp64"
fi
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for pcs attribute support" >&5
+$as_echo_n "checking for pcs attribute support... " >&6; }
+if ${libc_cv_gcc_pcs_attribute+:} false; then :
+ $as_echo_n "(cached) " >&6
+else
+ cat > conftest.c <<EOF
+__attribute__((aarch64_vector_pcs)) extern void foo (void);
+EOF
+libc_cv_gcc_pcs_attribute=no
+if ${CC-cc} -c -Wall -Werror conftest.c -o conftest.o 1>&5 \
+ 2>&5 ; then
+ libc_cv_gcc_pcs_attribute=yes
+fi
+rm -f conftest*
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_gcc_pcs_attribute" >&5
+$as_echo "$libc_cv_gcc_pcs_attribute" >&6; }
+
+# Enable libmvec by default.
+if test x"$build_mathvec" = xnotset; then
+ build_mathvec=yes
+fi
+
+# Only test libmvec if the compiler supports aarch64_vector_pcs.
+if test x"$build_mathvec" = xyes; then
+ if test $libc_cv_gcc_pcs_attribute = yes; then
+ config_vars="$config_vars
+test-mathvec = yes"
+ fi
+fi
else
LIBC_CONFIG_VAR([default-abi], [lp64])
fi
+
+AC_CACHE_CHECK([for pcs attribute support],
+ libc_cv_gcc_pcs_attribute, [dnl
+cat > conftest.c <<EOF
+__attribute__((aarch64_vector_pcs)) extern void foo (void);
+EOF
+libc_cv_gcc_pcs_attribute=no
+if ${CC-cc} -c -Wall -Werror conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \
+ 2>&AS_MESSAGE_LOG_FD ; then
+ libc_cv_gcc_pcs_attribute=yes
+fi
+rm -f conftest*])
+
+# Enable libmvec by default.
+if test x"$build_mathvec" = xnotset; then
+ build_mathvec=yes
+fi
+
+# Only test libmvec if the compiler supports aarch64_vector_pcs.
+if test x"$build_mathvec" = xyes; then
+ if test $libc_cv_gcc_pcs_attribute = yes; then
+ LIBC_CONFIG_VAR([test-mathvec], [yes])
+ fi
+fi
CFLAGS-s_fmin.c += -ffinite-math-only
CFLAGS-s_fminf.c += -ffinite-math-only
endif
+
+ifeq ($(subdir),mathvec)
+libmvec-support += \
+ libmvec_double_vlen2_exp \
+ libmvec_float_vlen4_expf \
+
+install-lib += libmvec_nonshared.a
+$(objpfx)libmvec_nonshared.a: $(dep-dummy-lib); $(make-dummy-lib)
+endif
+
+ifeq ($(subdir),math)
+ifeq ($(build-mathvec),yes)
+double-vlen2-funcs = exp
+float-vlen4-funcs = exp
+ifeq ($(test-mathvec),yes)
+libmvec-tests += double-vlen2 float-vlen4
+endif
+endif
+endif
--- /dev/null
+libmvec {
+ GLIBC_2.30 {
+ _ZGVnN2v_exp; _ZGVnN4v_expf;
+ }
+}
--- /dev/null
+/* Double-precision 2 element vector function template.
+ Copyright (C) 2019 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 <sysdep.h>
+
+ENTRY (VECTOR_FUNCTION)
+ stp x29, x30, [sp, -288]!
+ cfi_adjust_cfa_offset (288)
+ cfi_rel_offset (x29, 0)
+ cfi_rel_offset (x30, 8)
+ mov x29, sp
+ stp q8, q9, [sp, 16]
+ stp q10, q11, [sp, 48]
+ stp q12, q13, [sp, 80]
+ stp q14, q15, [sp, 112]
+ stp q16, q17, [sp, 144]
+ stp q18, q19, [sp, 176]
+ stp q20, q21, [sp, 208]
+ stp q22, q23, [sp, 240]
+
+ // Use per lane load/store to avoid endianness issues.
+ str q0, [sp, 272]
+ ldr d0, [sp, 272]
+ bl SCALAR_FUNCTION
+ str d0, [sp, 272]
+ ldr d0, [sp, 280]
+ bl SCALAR_FUNCTION
+ str d0, [sp, 280]
+ ldr q0, [sp, 272]
+
+ ldp q8, q9, [sp, 16]
+ ldp q10, q11, [sp, 48]
+ ldp q12, q13, [sp, 80]
+ ldp q14, q15, [sp, 112]
+ ldp q16, q17, [sp, 144]
+ ldp q18, q19, [sp, 176]
+ ldp q20, q21, [sp, 208]
+ ldp q22, q23, [sp, 240]
+ ldp x29, x30, [sp], 288
+ cfi_adjust_cfa_offset (288)
+ cfi_restore (x29)
+ cfi_restore (x30)
+ ret
+END (VECTOR_FUNCTION)
--- /dev/null
+/* Double-precision 2 element vector e^x function.
+ Copyright (C) 2019 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/>. */
+
+#define SCALAR_FUNCTION exp
+#define VECTOR_FUNCTION _ZGVnN2v_exp
+#include "libmvec_double_vlen2.h"
--- /dev/null
+/* Single-precision 4 element vector function template.
+ Copyright (C) 2019 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 <sysdep.h>
+
+ENTRY (VECTOR_FUNCTION)
+ stp x29, x30, [sp, -288]!
+ cfi_adjust_cfa_offset (288)
+ cfi_rel_offset (x29, 0)
+ cfi_rel_offset (x30, 8)
+ mov x29, sp
+ stp q8, q9, [sp, 16]
+ stp q10, q11, [sp, 48]
+ stp q12, q13, [sp, 80]
+ stp q14, q15, [sp, 112]
+ stp q16, q17, [sp, 144]
+ stp q18, q19, [sp, 176]
+ stp q20, q21, [sp, 208]
+ stp q22, q23, [sp, 240]
+
+ // Use per lane load/store to avoid endianness issues.
+ str q0, [sp, 272]
+ ldr s0, [sp, 272]
+ bl SCALAR_FUNCTION
+ str s0, [sp, 272]
+ ldr s0, [sp, 276]
+ bl SCALAR_FUNCTION
+ str s0, [sp, 276]
+ ldr s0, [sp, 280]
+ bl SCALAR_FUNCTION
+ str s0, [sp, 280]
+ ldr s0, [sp, 284]
+ bl SCALAR_FUNCTION
+ str s0, [sp, 284]
+ ldr q0, [sp, 272]
+
+ ldp q8, q9, [sp, 16]
+ ldp q10, q11, [sp, 48]
+ ldp q12, q13, [sp, 80]
+ ldp q14, q15, [sp, 112]
+ ldp q16, q17, [sp, 144]
+ ldp q18, q19, [sp, 176]
+ ldp q20, q21, [sp, 208]
+ ldp q22, q23, [sp, 240]
+ ldp x29, x30, [sp], 288
+ cfi_adjust_cfa_offset (288)
+ cfi_restore (x29)
+ cfi_restore (x30)
+ ret
+END (VECTOR_FUNCTION)
--- /dev/null
+/* Single-precision 4 element vector e^x function.
+ Copyright (C) 2019 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/>. */
+
+#define SCALAR_FUNCTION expf
+#define VECTOR_FUNCTION _ZGVnN4v_expf
+#include "libmvec_float_vlen4.h"
--- /dev/null
+/* Wrapper part of tests for aarch64 double vector math functions.
+ Copyright (C) 2019 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 <arm_neon.h>
+#include "test-double-vlen2.h"
+
+#define VEC_TYPE float64x2_t
+
+/* Hack: VECTOR_WRAPPER declares the vector function without the pcs attribute,
+ placing it here happens to work, should be fixed in test-math-vector.h. */
+__attribute__ ((aarch64_vector_pcs))
+
+VECTOR_WRAPPER (WRAPPER_NAME (exp), _ZGVnN2v_exp)
--- /dev/null
+/* Wrapper part of tests for float aarch64 vector math functions.
+ Copyright (C) 2019 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 <arm_neon.h>
+#include "test-float-vlen4.h"
+
+#define VEC_TYPE float32x4_t
+
+/* Hack: VECTOR_WRAPPER declares the vector function without the pcs attribute,
+ placing it here happens to work, should be fixed in test-math-vector.h. */
+__attribute__ ((aarch64_vector_pcs))
+
+VECTOR_WRAPPER (WRAPPER_NAME (expf), _ZGVnN4v_expf)
idouble: 1
ifloat: 1
+Function: "exp_vlen2":
+double: 1
+
+Function: "exp_vlen4":
+float: 1
+
Function: "expm1":
double: 1
float: 1
--- /dev/null
+GLIBC_2.30 _ZGVnN2v_exp F
+GLIBC_2.30 _ZGVnN4v_expf F
projects / thirdparty / glibc.git / commitdiff
