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aarch64/fpu: Add vector variants of tanh
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
This commit is contained in:
Joe Ramsay
Szabolcs Nagy
parent
eedbbca0bf
commit
3d3a4fb8e4
@ -7747,7 +7747,7 @@ tan min_subnorm
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tan -min_subnorm
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tanh 0
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tanh -0
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tanh -0 no-mathvec
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tanh 0.75
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tanh -0.75
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tanh 1.0
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@ -23,31 +23,31 @@ tanh 0
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= tanh tonearest ibm128 0x0p+0 : 0x0p+0 : inexact-ok
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= tanh towardzero ibm128 0x0p+0 : 0x0p+0 : inexact-ok
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= tanh upward ibm128 0x0p+0 : 0x0p+0 : inexact-ok
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tanh -0
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= tanh downward binary32 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh tonearest binary32 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh towardzero binary32 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh upward binary32 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh downward binary64 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh tonearest binary64 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh towardzero binary64 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh upward binary64 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh downward intel96 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh tonearest intel96 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh towardzero intel96 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh upward intel96 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh downward m68k96 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh tonearest m68k96 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh towardzero m68k96 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh upward m68k96 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh downward binary128 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh tonearest binary128 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh towardzero binary128 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh upward binary128 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh downward ibm128 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh tonearest ibm128 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh towardzero ibm128 -0x0p+0 : -0x0p+0 : inexact-ok
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= tanh upward ibm128 -0x0p+0 : -0x0p+0 : inexact-ok
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tanh -0 no-mathvec
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= tanh downward binary32 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh tonearest binary32 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh towardzero binary32 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh upward binary32 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh downward binary64 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh tonearest binary64 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh towardzero binary64 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh upward binary64 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh downward intel96 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh tonearest intel96 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh towardzero intel96 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh upward intel96 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh downward m68k96 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh tonearest m68k96 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh towardzero m68k96 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh upward m68k96 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh downward binary128 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh tonearest binary128 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh towardzero binary128 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh upward binary128 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh downward ibm128 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh tonearest ibm128 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh towardzero ibm128 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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= tanh upward ibm128 -0x0p+0 : -0x0p+0 : no-mathvec inexact-ok
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tanh 0.75
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= tanh downward binary32 0xcp-4 : 0xa.2991fp-4 : inexact-ok
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= tanh tonearest binary32 0xcp-4 : 0xa.2991fp-4 : inexact-ok
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@ -18,7 +18,8 @@ libmvec-supported-funcs = acos \
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log2 \
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sin \
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sinh \
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tan
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tan \
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tanh
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float-advsimd-funcs = $(libmvec-supported-funcs)
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double-advsimd-funcs = $(libmvec-supported-funcs)
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@ -109,5 +109,10 @@ libmvec {
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_ZGVnN4v_sinhf;
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_ZGVsMxv_sinh;
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_ZGVsMxv_sinhf;
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_ZGVnN2v_tanh;
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_ZGVnN2v_tanhf;
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_ZGVnN4v_tanhf;
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_ZGVsMxv_tanh;
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_ZGVsMxv_tanhf;
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}
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}
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@ -37,4 +37,5 @@ libmvec_hidden_proto (V_NAME_F1(log));
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libmvec_hidden_proto (V_NAME_F1(sin));
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libmvec_hidden_proto (V_NAME_F1(sinh));
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libmvec_hidden_proto (V_NAME_F1(tan));
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libmvec_hidden_proto (V_NAME_F1(tanh));
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libmvec_hidden_proto (V_NAME_F2(atan2));
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@ -113,6 +113,10 @@
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# define __DECL_SIMD_tan __DECL_SIMD_aarch64
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# undef __DECL_SIMD_tanf
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# define __DECL_SIMD_tanf __DECL_SIMD_aarch64
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# undef __DECL_SIMD_tanh
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# define __DECL_SIMD_tanh __DECL_SIMD_aarch64
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# undef __DECL_SIMD_tanhf
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# define __DECL_SIMD_tanhf __DECL_SIMD_aarch64
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#endif
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#if __GNUC_PREREQ(9, 0)
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@ -160,6 +164,7 @@ __vpcs __f32x4_t _ZGVnN4v_log2f (__f32x4_t);
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__vpcs __f32x4_t _ZGVnN4v_sinf (__f32x4_t);
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__vpcs __f32x4_t _ZGVnN4v_sinhf (__f32x4_t);
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__vpcs __f32x4_t _ZGVnN4v_tanf (__f32x4_t);
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__vpcs __f32x4_t _ZGVnN4v_tanhf (__f32x4_t);
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__vpcs __f64x2_t _ZGVnN2vv_atan2 (__f64x2_t, __f64x2_t);
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__vpcs __f64x2_t _ZGVnN2v_acos (__f64x2_t);
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@ -182,6 +187,7 @@ __vpcs __f64x2_t _ZGVnN2v_log2 (__f64x2_t);
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__vpcs __f64x2_t _ZGVnN2v_sin (__f64x2_t);
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__vpcs __f64x2_t _ZGVnN2v_sinh (__f64x2_t);
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__vpcs __f64x2_t _ZGVnN2v_tan (__f64x2_t);
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__vpcs __f64x2_t _ZGVnN2v_tanh (__f64x2_t);
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# undef __ADVSIMD_VEC_MATH_SUPPORTED
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#endif /* __ADVSIMD_VEC_MATH_SUPPORTED */
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@ -209,6 +215,7 @@ __sv_f32_t _ZGVsMxv_log2f (__sv_f32_t, __sv_bool_t);
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__sv_f32_t _ZGVsMxv_sinf (__sv_f32_t, __sv_bool_t);
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__sv_f32_t _ZGVsMxv_sinhf (__sv_f32_t, __sv_bool_t);
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__sv_f32_t _ZGVsMxv_tanf (__sv_f32_t, __sv_bool_t);
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__sv_f32_t _ZGVsMxv_tanhf (__sv_f32_t, __sv_bool_t);
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__sv_f64_t _ZGVsMxvv_atan2 (__sv_f64_t, __sv_f64_t, __sv_bool_t);
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__sv_f64_t _ZGVsMxv_acos (__sv_f64_t, __sv_bool_t);
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@ -231,6 +238,7 @@ __sv_f64_t _ZGVsMxv_log2 (__sv_f64_t, __sv_bool_t);
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__sv_f64_t _ZGVsMxv_sin (__sv_f64_t, __sv_bool_t);
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__sv_f64_t _ZGVsMxv_sinh (__sv_f64_t, __sv_bool_t);
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__sv_f64_t _ZGVsMxv_tan (__sv_f64_t, __sv_bool_t);
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__sv_f64_t _ZGVsMxv_tanh (__sv_f64_t, __sv_bool_t);
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# undef __SVE_VEC_MATH_SUPPORTED
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#endif /* __SVE_VEC_MATH_SUPPORTED */
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109
sysdeps/aarch64/fpu/tanh_advsimd.c
Normal file
109
sysdeps/aarch64/fpu/tanh_advsimd.c
Normal file
@ -0,0 +1,109 @@
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/* Double-precision vector (Advanced SIMD) tanh function
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include "v_math.h"
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#include "poly_advsimd_f64.h"
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static const struct data
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{
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float64x2_t poly[11];
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float64x2_t inv_ln2, ln2_hi, ln2_lo, shift;
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uint64x2_t onef;
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uint64x2_t thresh, tiny_bound;
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} data = {
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/* Generated using Remez, deg=12 in [-log(2)/2, log(2)/2]. */
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.poly = { V2 (0x1p-1), V2 (0x1.5555555555559p-3), V2 (0x1.555555555554bp-5),
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V2 (0x1.111111110f663p-7), V2 (0x1.6c16c16c1b5f3p-10),
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V2 (0x1.a01a01affa35dp-13), V2 (0x1.a01a018b4ecbbp-16),
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V2 (0x1.71ddf82db5bb4p-19), V2 (0x1.27e517fc0d54bp-22),
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V2 (0x1.af5eedae67435p-26), V2 (0x1.1f143d060a28ap-29), },
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.inv_ln2 = V2 (0x1.71547652b82fep0),
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.ln2_hi = V2 (-0x1.62e42fefa39efp-1),
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.ln2_lo = V2 (-0x1.abc9e3b39803fp-56),
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.shift = V2 (0x1.8p52),
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.onef = V2 (0x3ff0000000000000),
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.tiny_bound = V2 (0x3e40000000000000), /* asuint64 (0x1p-27). */
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/* asuint64(0x1.241bf835f9d5fp+4) - asuint64(tiny_bound). */
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.thresh = V2 (0x01f241bf835f9d5f),
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};
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static inline float64x2_t
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expm1_inline (float64x2_t x, const struct data *d)
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{
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/* Helper routine for calculating exp(x) - 1. Vector port of the helper from
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the scalar variant of tanh. */
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/* Reduce argument: f in [-ln2/2, ln2/2], i is exact. */
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float64x2_t j = vsubq_f64 (vfmaq_f64 (d->shift, d->inv_ln2, x), d->shift);
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int64x2_t i = vcvtq_s64_f64 (j);
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float64x2_t f = vfmaq_f64 (x, j, d->ln2_hi);
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f = vfmaq_f64 (f, j, d->ln2_lo);
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/* Approximate expm1(f) using polynomial. */
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float64x2_t f2 = vmulq_f64 (f, f);
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float64x2_t f4 = vmulq_f64 (f2, f2);
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float64x2_t p = vfmaq_f64 (
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f, f2, v_estrin_10_f64 (f, f2, f4, vmulq_f64 (f4, f4), d->poly));
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/* t = 2 ^ i. */
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float64x2_t t = vreinterpretq_f64_u64 (
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vaddq_u64 (vreinterpretq_u64_s64 (i << 52), d->onef));
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/* expm1(x) = p * t + (t - 1). */
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return vfmaq_f64 (vsubq_f64 (t, v_f64 (1)), p, t);
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}
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static float64x2_t NOINLINE VPCS_ATTR
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special_case (float64x2_t x, float64x2_t y, uint64x2_t special)
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{
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return v_call_f64 (tanh, x, y, special);
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}
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/* Vector approximation for double-precision tanh(x), using a simplified
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version of expm1. The greatest observed error is 2.77 ULP:
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_ZGVnN2v_tanh(-0x1.c4a4ca0f9f3b7p-3) got -0x1.bd6a21a163627p-3
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want -0x1.bd6a21a163624p-3. */
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float64x2_t VPCS_ATTR V_NAME_D1 (tanh) (float64x2_t x)
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{
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const struct data *d = ptr_barrier (&data);
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uint64x2_t ia = vreinterpretq_u64_f64 (vabsq_f64 (x));
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float64x2_t u = x;
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/* Trigger special-cases for tiny, boring and infinity/NaN. */
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uint64x2_t special = vcgtq_u64 (vsubq_u64 (ia, d->tiny_bound), d->thresh);
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#if WANT_SIMD_EXCEPT
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/* To trigger fp exceptions correctly, set special lanes to a neutral value.
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They will be fixed up later by the special-case handler. */
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if (__glibc_unlikely (v_any_u64 (special)))
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u = v_zerofy_f64 (u, special);
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#endif
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u = vaddq_f64 (u, u);
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/* tanh(x) = (e^2x - 1) / (e^2x + 1). */
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float64x2_t q = expm1_inline (u, d);
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float64x2_t qp2 = vaddq_f64 (q, v_f64 (2));
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if (__glibc_unlikely (v_any_u64 (special)))
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return special_case (x, vdivq_f64 (q, qp2), special);
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return vdivq_f64 (q, qp2);
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}
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100
sysdeps/aarch64/fpu/tanh_sve.c
Normal file
100
sysdeps/aarch64/fpu/tanh_sve.c
Normal file
@ -0,0 +1,100 @@
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/* Double-precision vector (SVE) tanh function
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
|
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modify it under the terms of the GNU Lesser General Public
|
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License as published by the Free Software Foundation; either
|
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version 2.1 of the License, or (at your option) any later version.
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|
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The GNU C Library is distributed in the hope that it will be useful,
|
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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
|
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<https://www.gnu.org/licenses/>. */
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#include "sv_math.h"
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#include "poly_sve_f64.h"
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static const struct data
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{
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float64_t poly[11];
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float64_t inv_ln2, ln2_hi, ln2_lo, shift;
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uint64_t thresh, tiny_bound;
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} data = {
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/* Generated using Remez, deg=12 in [-log(2)/2, log(2)/2]. */
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.poly = { 0x1p-1, 0x1.5555555555559p-3, 0x1.555555555554bp-5,
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0x1.111111110f663p-7, 0x1.6c16c16c1b5f3p-10,
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0x1.a01a01affa35dp-13, 0x1.a01a018b4ecbbp-16,
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0x1.71ddf82db5bb4p-19, 0x1.27e517fc0d54bp-22,
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0x1.af5eedae67435p-26, 0x1.1f143d060a28ap-29, },
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.inv_ln2 = 0x1.71547652b82fep0,
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.ln2_hi = -0x1.62e42fefa39efp-1,
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.ln2_lo = -0x1.abc9e3b39803fp-56,
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.shift = 0x1.8p52,
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.tiny_bound = 0x3e40000000000000, /* asuint64 (0x1p-27). */
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/* asuint64(0x1.241bf835f9d5fp+4) - asuint64(tiny_bound). */
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.thresh = 0x01f241bf835f9d5f,
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};
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static inline svfloat64_t
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expm1_inline (svfloat64_t x, const svbool_t pg, const struct data *d)
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{
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/* Helper routine for calculating exp(x) - 1. Vector port of the helper from
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the scalar variant of tanh. */
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/* Reduce argument: f in [-ln2/2, ln2/2], i is exact. */
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svfloat64_t j
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= svsub_x (pg, svmla_x (pg, sv_f64 (d->shift), x, d->inv_ln2), d->shift);
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svint64_t i = svcvt_s64_x (pg, j);
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svfloat64_t f = svmla_x (pg, x, j, d->ln2_hi);
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f = svmla_x (pg, f, j, d->ln2_lo);
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/* Approximate expm1(f) using polynomial. */
|
||||
svfloat64_t f2 = svmul_x (pg, f, f);
|
||||
svfloat64_t f4 = svmul_x (pg, f2, f2);
|
||||
svfloat64_t p = svmla_x (
|
||||
pg, f, f2,
|
||||
sv_estrin_10_f64_x (pg, f, f2, f4, svmul_x (pg, f4, f4), d->poly));
|
||||
|
||||
/* t = 2 ^ i. */
|
||||
svfloat64_t t = svscale_x (pg, sv_f64 (1), i);
|
||||
/* expm1(x) = p * t + (t - 1). */
|
||||
return svmla_x (pg, svsub_x (pg, t, 1), p, t);
|
||||
}
|
||||
|
||||
static svfloat64_t NOINLINE
|
||||
special_case (svfloat64_t x, svfloat64_t y, svbool_t special)
|
||||
{
|
||||
return sv_call_f64 (tanh, x, y, special);
|
||||
}
|
||||
|
||||
/* SVE approximation for double-precision tanh(x), using a simplified
|
||||
version of expm1. The greatest observed error is 2.77 ULP:
|
||||
_ZGVsMxv_tanh(-0x1.c4a4ca0f9f3b7p-3) got -0x1.bd6a21a163627p-3
|
||||
want -0x1.bd6a21a163624p-3. */
|
||||
svfloat64_t SV_NAME_D1 (tanh) (svfloat64_t x, svbool_t pg)
|
||||
{
|
||||
const struct data *d = ptr_barrier (&data);
|
||||
|
||||
svuint64_t ia = svreinterpret_u64 (svabs_x (pg, x));
|
||||
|
||||
/* Trigger special-cases for tiny, boring and infinity/NaN. */
|
||||
svbool_t special = svcmpgt (pg, svsub_x (pg, ia, d->tiny_bound), d->thresh);
|
||||
|
||||
svfloat64_t u = svadd_x (pg, x, x);
|
||||
|
||||
/* tanh(x) = (e^2x - 1) / (e^2x + 1). */
|
||||
svfloat64_t q = expm1_inline (u, pg, d);
|
||||
svfloat64_t qp2 = svadd_x (pg, q, 2);
|
||||
|
||||
if (__glibc_unlikely (svptest_any (pg, special)))
|
||||
return special_case (x, svdiv_x (pg, q, qp2), special);
|
||||
return svdiv_x (pg, q, qp2);
|
||||
}
|
||||
76
sysdeps/aarch64/fpu/tanhf_advsimd.c
Normal file
76
sysdeps/aarch64/fpu/tanhf_advsimd.c
Normal file
@ -0,0 +1,76 @@
|
||||
/* Single-precision vector (Advanced SIMD) tanh function
|
||||
|
||||
Copyright (C) 2024 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
|
||||
<https://www.gnu.org/licenses/>. */
|
||||
|
||||
#include "v_expm1f_inline.h"
|
||||
|
||||
static const struct data
|
||||
{
|
||||
struct v_expm1f_data expm1f_consts;
|
||||
uint32x4_t boring_bound, large_bound, onef;
|
||||
} data = {
|
||||
.expm1f_consts = V_EXPM1F_DATA,
|
||||
/* 0x1.205966p+3, above which tanhf rounds to 1 (or -1 for negative). */
|
||||
.boring_bound = V4 (0x41102cb3),
|
||||
.large_bound = V4 (0x7f800000),
|
||||
.onef = V4 (0x3f800000),
|
||||
};
|
||||
|
||||
static float32x4_t NOINLINE VPCS_ATTR
|
||||
special_case (float32x4_t x, float32x4_t y, uint32x4_t special)
|
||||
{
|
||||
return v_call_f32 (tanhf, x, y, special);
|
||||
}
|
||||
|
||||
/* Approximation for single-precision vector tanh(x), using a simplified
|
||||
version of expm1f. The maximum error is 2.58 ULP:
|
||||
_ZGVnN4v_tanhf (0x1.fa5eep-5) got 0x1.f9ba02p-5
|
||||
want 0x1.f9ba08p-5. */
|
||||
float32x4_t VPCS_ATTR NOINLINE V_NAME_F1 (tanh) (float32x4_t x)
|
||||
{
|
||||
const struct data *d = ptr_barrier (&data);
|
||||
|
||||
uint32x4_t ix = vreinterpretq_u32_f32 (x);
|
||||
float32x4_t ax = vabsq_f32 (x);
|
||||
uint32x4_t iax = vreinterpretq_u32_f32 (ax);
|
||||
uint32x4_t sign = veorq_u32 (ix, iax);
|
||||
uint32x4_t is_boring = vcgtq_u32 (iax, d->boring_bound);
|
||||
float32x4_t boring = vreinterpretq_f32_u32 (vorrq_u32 (sign, d->onef));
|
||||
|
||||
#if WANT_SIMD_EXCEPT
|
||||
/* If fp exceptions are to be triggered properly, set all special and boring
|
||||
lanes to 0, which will trigger no exceptions, and fix them up later. */
|
||||
uint32x4_t special = vorrq_u32 (vcgtq_u32 (iax, d->large_bound),
|
||||
vcltq_u32 (iax, v_u32 (0x34000000)));
|
||||
x = v_zerofy_f32 (x, is_boring);
|
||||
if (__glibc_unlikely (v_any_u32 (special)))
|
||||
x = v_zerofy_f32 (x, special);
|
||||
#else
|
||||
uint32x4_t special = vcgtq_u32 (iax, d->large_bound);
|
||||
#endif
|
||||
|
||||
/* tanh(x) = (e^2x - 1) / (e^2x + 1). */
|
||||
float32x4_t q = expm1f_inline (vmulq_n_f32 (x, 2), &d->expm1f_consts);
|
||||
float32x4_t y = vdivq_f32 (q, vaddq_f32 (q, v_f32 (2.0)));
|
||||
if (__glibc_unlikely (v_any_u32 (special)))
|
||||
return special_case (vreinterpretq_f32_u32 (ix),
|
||||
vbslq_f32 (is_boring, boring, y), special);
|
||||
return vbslq_f32 (is_boring, boring, y);
|
||||
}
|
||||
libmvec_hidden_def (V_NAME_F1 (tanh))
|
||||
HALF_WIDTH_ALIAS_F1 (tanh)
|
||||
61
sysdeps/aarch64/fpu/tanhf_sve.c
Normal file
61
sysdeps/aarch64/fpu/tanhf_sve.c
Normal file
@ -0,0 +1,61 @@
|
||||
/* Single-precision vector (SVE) tanh function
|
||||
|
||||
Copyright (C) 2024 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
|
||||
<https://www.gnu.org/licenses/>. */
|
||||
|
||||
#include "sv_expm1f_inline.h"
|
||||
|
||||
static const struct data
|
||||
{
|
||||
struct sv_expm1f_data expm1f_consts;
|
||||
uint32_t boring_bound, onef;
|
||||
} data = {
|
||||
.expm1f_consts = SV_EXPM1F_DATA,
|
||||
/* 0x1.205966p+3, above which tanhf rounds to 1 (or -1 for negative). */
|
||||
.boring_bound = 0x41102cb3,
|
||||
.onef = 0x3f800000,
|
||||
};
|
||||
|
||||
static svfloat32_t NOINLINE
|
||||
special_case (svfloat32_t x, svfloat32_t y, svbool_t special)
|
||||
{
|
||||
return sv_call_f32 (tanhf, x, y, special);
|
||||
}
|
||||
|
||||
/* Approximation for single-precision SVE tanh(x), using a simplified
|
||||
version of expm1f. The maximum error is 2.57 ULP:
|
||||
_ZGVsMxv_tanhf (0x1.fc1832p-5) got 0x1.fb71a4p-5
|
||||
want 0x1.fb71aap-5. */
|
||||
svfloat32_t SV_NAME_F1 (tanh) (svfloat32_t x, const svbool_t pg)
|
||||
{
|
||||
const struct data *d = ptr_barrier (&data);
|
||||
|
||||
svfloat32_t ax = svabs_x (pg, x);
|
||||
svuint32_t iax = svreinterpret_u32 (ax);
|
||||
svuint32_t sign = sveor_x (pg, svreinterpret_u32 (x), iax);
|
||||
svbool_t is_boring = svcmpgt (pg, iax, d->boring_bound);
|
||||
svfloat32_t boring = svreinterpret_f32 (svorr_x (pg, sign, d->onef));
|
||||
|
||||
svbool_t special = svcmpgt (pg, iax, 0x7f800000);
|
||||
|
||||
/* tanh(x) = (e^2x - 1) / (e^2x + 1). */
|
||||
svfloat32_t q = expm1f_inline (svmul_x (pg, x, 2.0), pg, &d->expm1f_consts);
|
||||
svfloat32_t y = svdiv_x (pg, q, svadd_x (pg, q, 2.0));
|
||||
if (__glibc_unlikely (svptest_any (pg, special)))
|
||||
return special_case (x, svsel_f32 (is_boring, boring, y), special);
|
||||
return svsel_f32 (is_boring, boring, y);
|
||||
}
|
||||
@ -44,3 +44,4 @@ VPCS_VECTOR_WRAPPER (log2_advsimd, _ZGVnN2v_log2)
|
||||
VPCS_VECTOR_WRAPPER (sin_advsimd, _ZGVnN2v_sin)
|
||||
VPCS_VECTOR_WRAPPER (sinh_advsimd, _ZGVnN2v_sinh)
|
||||
VPCS_VECTOR_WRAPPER (tan_advsimd, _ZGVnN2v_tan)
|
||||
VPCS_VECTOR_WRAPPER (tanh_advsimd, _ZGVnN2v_tanh)
|
||||
|
||||
@ -63,3 +63,4 @@ SVE_VECTOR_WRAPPER (log2_sve, _ZGVsMxv_log2)
|
||||
SVE_VECTOR_WRAPPER (sin_sve, _ZGVsMxv_sin)
|
||||
SVE_VECTOR_WRAPPER (sinh_sve, _ZGVsMxv_sinh)
|
||||
SVE_VECTOR_WRAPPER (tan_sve, _ZGVsMxv_tan)
|
||||
SVE_VECTOR_WRAPPER (tanh_sve, _ZGVsMxv_tanh)
|
||||
|
||||
@ -44,3 +44,4 @@ VPCS_VECTOR_WRAPPER (log2f_advsimd, _ZGVnN4v_log2f)
|
||||
VPCS_VECTOR_WRAPPER (sinf_advsimd, _ZGVnN4v_sinf)
|
||||
VPCS_VECTOR_WRAPPER (sinhf_advsimd, _ZGVnN4v_sinhf)
|
||||
VPCS_VECTOR_WRAPPER (tanf_advsimd, _ZGVnN4v_tanf)
|
||||
VPCS_VECTOR_WRAPPER (tanhf_advsimd, _ZGVnN4v_tanhf)
|
||||
|
||||
@ -63,3 +63,4 @@ SVE_VECTOR_WRAPPER (log2f_sve, _ZGVsMxv_log2f)
|
||||
SVE_VECTOR_WRAPPER (sinf_sve, _ZGVsMxv_sinf)
|
||||
SVE_VECTOR_WRAPPER (sinhf_sve, _ZGVsMxv_sinhf)
|
||||
SVE_VECTOR_WRAPPER (tanf_sve, _ZGVsMxv_tanf)
|
||||
SVE_VECTOR_WRAPPER (tanhf_sve, _ZGVsMxv_tanhf)
|
||||
|
||||
@ -1496,11 +1496,19 @@ double: 2
|
||||
float: 2
|
||||
ldouble: 2
|
||||
|
||||
Function: "tanh_advsimd":
|
||||
double: 2
|
||||
float: 2
|
||||
|
||||
Function: "tanh_downward":
|
||||
double: 3
|
||||
float: 3
|
||||
ldouble: 4
|
||||
|
||||
Function: "tanh_sve":
|
||||
double: 2
|
||||
float: 2
|
||||
|
||||
Function: "tanh_towardzero":
|
||||
double: 2
|
||||
float: 2
|
||||
|
||||
@ -85,12 +85,15 @@ GLIBC_2.40 _ZGVnN2v_erf F
|
||||
GLIBC_2.40 _ZGVnN2v_erff F
|
||||
GLIBC_2.40 _ZGVnN2v_sinh F
|
||||
GLIBC_2.40 _ZGVnN2v_sinhf F
|
||||
GLIBC_2.40 _ZGVnN2v_tanh F
|
||||
GLIBC_2.40 _ZGVnN2v_tanhf F
|
||||
GLIBC_2.40 _ZGVnN4v_acoshf F
|
||||
GLIBC_2.40 _ZGVnN4v_asinhf F
|
||||
GLIBC_2.40 _ZGVnN4v_atanhf F
|
||||
GLIBC_2.40 _ZGVnN4v_coshf F
|
||||
GLIBC_2.40 _ZGVnN4v_erff F
|
||||
GLIBC_2.40 _ZGVnN4v_sinhf F
|
||||
GLIBC_2.40 _ZGVnN4v_tanhf F
|
||||
GLIBC_2.40 _ZGVsMxv_acosh F
|
||||
GLIBC_2.40 _ZGVsMxv_acoshf F
|
||||
GLIBC_2.40 _ZGVsMxv_asinh F
|
||||
@ -103,3 +106,5 @@ GLIBC_2.40 _ZGVsMxv_erf F
|
||||
GLIBC_2.40 _ZGVsMxv_erff F
|
||||
GLIBC_2.40 _ZGVsMxv_sinh F
|
||||
GLIBC_2.40 _ZGVsMxv_sinhf F
|
||||
GLIBC_2.40 _ZGVsMxv_tanh F
|
||||
GLIBC_2.40 _ZGVsMxv_tanhf F
|
||||
|
||||
Loading…
Reference in New Issue
Block a user