1 /* Function atanf vectorized with AVX2.
2 Copyright (C) 2021-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 https://www.gnu.org/licenses/. */
20 * ALGORITHM DESCRIPTION:
22 * For 0.0 <= x <= 7.0/16.0: atan(x) = atan(0.0) + atan(s), where s=(x-0.0)/(1.0+0.0*x)
23 * For 7.0/16.0 <= x <= 11.0/16.0: atan(x) = atan(0.5) + atan(s), where s=(x-0.5)/(1.0+0.5*x)
24 * For 11.0/16.0 <= x <= 19.0/16.0: atan(x) = atan(1.0) + atan(s), where s=(x-1.0)/(1.0+1.0*x)
25 * For 19.0/16.0 <= x <= 39.0/16.0: atan(x) = atan(1.5) + atan(s), where s=(x-1.5)/(1.0+1.5*x)
26 * For 39.0/16.0 <= x <= inf : atan(x) = atan(inf) + atan(s), where s=-1.0/x
27 * Where atan(s) ~= s+s^3*Poly11(s^2) on interval |s|<7.0/0.16.
31 /* Offsets for data table __svml_satan_data_internal
49 .section .text.avx2, "ax", @progbits
50 ENTRY(_ZGVdN8v_atanf_avx2)
52 * 1) If x>1, then r=-1/x, PIO2=Pi/2
53 * 2) If -1<=x<=1, then r=x, PIO2=0
54 * 3) If x<-1, then r=-1/x, PIO2=-Pi/2
56 vmovups _sONE+__svml_satan_data_internal(%rip), %ymm2
57 vmovups __svml_satan_data_internal(%rip), %ymm7
58 vmovups _sPC7+__svml_satan_data_internal(%rip), %ymm13
61 * To use minps\maxps operations for argument reduction
62 * uncomment _AT_USEMINMAX_ definition
67 vandps _sABS_MASK+__svml_satan_data_internal(%rip), %ymm0, %ymm3
68 vmaxps %ymm3, %ymm2, %ymm5
69 vminps %ymm3, %ymm2, %ymm4
70 vcmple_oqps %ymm2, %ymm3, %ymm6
71 vdivps %ymm5, %ymm4, %ymm11
72 vandps %ymm7, %ymm0, %ymm9
73 vandnps %ymm7, %ymm6, %ymm8
74 vxorps %ymm9, %ymm8, %ymm10
75 vxorps %ymm11, %ymm10, %ymm15
78 vmulps %ymm15, %ymm15, %ymm14
79 vmovups _sPC8+__svml_satan_data_internal(%rip), %ymm0
80 vmulps %ymm14, %ymm14, %ymm12
81 vfmadd213ps _sPC6+__svml_satan_data_internal(%rip), %ymm12, %ymm0
82 vfmadd213ps _sPC5+__svml_satan_data_internal(%rip), %ymm12, %ymm13
83 vfmadd213ps _sPC4+__svml_satan_data_internal(%rip), %ymm12, %ymm0
84 vfmadd213ps _sPC3+__svml_satan_data_internal(%rip), %ymm12, %ymm13
85 vfmadd213ps _sPC2+__svml_satan_data_internal(%rip), %ymm12, %ymm0
86 vfmadd213ps _sPC1+__svml_satan_data_internal(%rip), %ymm12, %ymm13
87 vfmadd213ps %ymm13, %ymm14, %ymm0
88 vfmadd213ps _sPC0+__svml_satan_data_internal(%rip), %ymm14, %ymm0
89 vandnps _sPIO2+__svml_satan_data_internal(%rip), %ymm6, %ymm1
90 vxorps %ymm9, %ymm1, %ymm1
93 vfmadd213ps %ymm1, %ymm15, %ymm0
96 END(_ZGVdN8v_atanf_avx2)
101 #ifdef __svml_satan_data_internal_typedef
102 typedef unsigned int VUINT32;
104 __declspec(align(32)) VUINT32 _sSIGN_MASK[8][1];
105 __declspec(align(32)) VUINT32 _sABS_MASK[8][1];
106 __declspec(align(32)) VUINT32 _sONE[8][1];
107 __declspec(align(32)) VUINT32 _sPIO2[8][1];
108 __declspec(align(32)) VUINT32 _sPC8[8][1];
109 __declspec(align(32)) VUINT32 _sPC7[8][1];
110 __declspec(align(32)) VUINT32 _sPC6[8][1];
111 __declspec(align(32)) VUINT32 _sPC5[8][1];
112 __declspec(align(32)) VUINT32 _sPC4[8][1];
113 __declspec(align(32)) VUINT32 _sPC3[8][1];
114 __declspec(align(32)) VUINT32 _sPC2[8][1];
115 __declspec(align(32)) VUINT32 _sPC1[8][1];
116 __declspec(align(32)) VUINT32 _sPC0[8][1];
117 } __svml_satan_data_internal;
119 __svml_satan_data_internal:
120 .long 0x80000000, 0x80000000, 0x80000000, 0x80000000, 0x80000000, 0x80000000, 0x80000000, 0x80000000 // _sSIGN_MASK
122 .long 0x7FFFFFFF, 0x7FFFFFFF, 0x7FFFFFFF, 0x7FFFFFFF, 0x7FFFFFFF, 0x7FFFFFFF, 0x7FFFFFFF, 0x7FFFFFFF // _sABS_MASK
124 .long 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000 // _sONE
126 .long 0x3FC90FDB, 0x3FC90FDB, 0x3FC90FDB, 0x3FC90FDB, 0x3FC90FDB, 0x3FC90FDB, 0x3FC90FDB, 0x3FC90FDB // _sPIO2
128 .long 0x3B322CC0, 0x3B322CC0, 0x3B322CC0, 0x3B322CC0, 0x3B322CC0, 0x3B322CC0, 0x3B322CC0, 0x3B322CC0 // _sPC8
130 .long 0xBC7F2631, 0xBC7F2631, 0xBC7F2631, 0xBC7F2631, 0xBC7F2631, 0xBC7F2631, 0xBC7F2631, 0xBC7F2631 // _sPC7
132 .long 0x3D2BC384, 0x3D2BC384, 0x3D2BC384, 0x3D2BC384, 0x3D2BC384, 0x3D2BC384, 0x3D2BC384, 0x3D2BC384 // _sPC6
134 .long 0xBD987629, 0xBD987629, 0xBD987629, 0xBD987629, 0xBD987629, 0xBD987629, 0xBD987629, 0xBD987629 // _sPC5
136 .long 0x3DD96474, 0x3DD96474, 0x3DD96474, 0x3DD96474, 0x3DD96474, 0x3DD96474, 0x3DD96474, 0x3DD96474 // _sPC4
138 .long 0xBE1161F8, 0xBE1161F8, 0xBE1161F8, 0xBE1161F8, 0xBE1161F8, 0xBE1161F8, 0xBE1161F8, 0xBE1161F8 // _sPC3
140 .long 0x3E4CB79F, 0x3E4CB79F, 0x3E4CB79F, 0x3E4CB79F, 0x3E4CB79F, 0x3E4CB79F, 0x3E4CB79F, 0x3E4CB79F // _sPC2
142 .long 0xBEAAAA49, 0xBEAAAA49, 0xBEAAAA49, 0xBEAAAA49, 0xBEAAAA49, 0xBEAAAA49, 0xBEAAAA49, 0xBEAAAA49 // _sPC1
144 .long 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000 // _sPC0
146 .type __svml_satan_data_internal, @object
147 .size __svml_satan_data_internal, .-__svml_satan_data_internal