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774488f8 | 1 | /* Function logf vectorized with SSE4. |
dff8da6b | 2 | Copyright (C) 2014-2024 Free Software Foundation, Inc. |
774488f8 AS |
3 | This file is part of the GNU C Library. |
4 | ||
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. | |
9 | ||
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. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
774488f8 AS |
18 | |
19 | #include <sysdep.h> | |
20 | #include "svml_s_logf_data.h" | |
21 | ||
e1d082d9 | 22 | .section .text.sse4, "ax", @progbits |
774488f8 AS |
23 | ENTRY (_ZGVbN4v_logf_sse4) |
24 | /* | |
25 | ALGORITHM DESCRIPTION: | |
26 | ||
27 | log(x) = exponent_x*log(2) + log(mantissa_x), if mantissa_x<4/3 | |
28 | log(x) = (exponent_x+1)*log(2) + log(0.5*mantissa_x), if mantissa_x>4/3 | |
29 | ||
30 | R = mantissa_x - 1, if mantissa_x<4/3 | |
31 | R = 0.5*mantissa_x - 1, if mantissa_x>4/3 | |
32 | |R|< 1/3 | |
33 | ||
34 | log(1+R) is approximated as a polynomial: degree 9 for 1-ulp, | |
35 | degree 7 for 4-ulp, degree 3 for half-precision. */ | |
36 | ||
37 | pushq %rbp | |
38 | cfi_adjust_cfa_offset (8) | |
39 | cfi_rel_offset (%rbp, 0) | |
40 | movq %rsp, %rbp | |
41 | cfi_def_cfa_register (%rbp) | |
42 | andq $-64, %rsp | |
43 | subq $320, %rsp | |
44 | ||
45 | /* reduction: compute r,n */ | |
46 | movaps %xmm0, %xmm2 | |
47 | ||
48 | /* check for working range, | |
49 | set special argument mask (denormals/zero/Inf/NaN) */ | |
50 | movq __svml_slog_data@GOTPCREL(%rip), %rax | |
51 | movdqu _iHiDelta(%rax), %xmm1 | |
52 | movdqu _iLoRange(%rax), %xmm4 | |
53 | paddd %xmm0, %xmm1 | |
54 | movdqu _iBrkValue(%rax), %xmm3 | |
55 | pcmpgtd %xmm1, %xmm4 | |
56 | movdqu _iOffExpoMask(%rax), %xmm1 | |
57 | psubd %xmm3, %xmm2 | |
58 | pand %xmm2, %xmm1 | |
59 | ||
60 | /* exponent_x (mantissa_x<4/3) or exponent_x+1 (mantissa_x>4/3) */ | |
61 | psrad $23, %xmm2 | |
62 | paddd %xmm3, %xmm1 | |
63 | movups _sPoly_7(%rax), %xmm5 | |
64 | ||
65 | /* mantissa_x (mantissa_x<4/3), or 0.5*mantissa_x (mantissa_x>4/3) */ | |
66 | cvtdq2ps %xmm2, %xmm6 | |
67 | ||
68 | /* reduced argument R */ | |
69 | subps _sOne(%rax), %xmm1 | |
70 | movmskps %xmm4, %ecx | |
71 | ||
72 | /* final reconstruction: | |
73 | add exponent_value*log2 to polynomial result */ | |
74 | mulps _sLn2(%rax), %xmm6 | |
75 | ||
76 | /* polynomial evaluation starts here */ | |
77 | mulps %xmm1, %xmm5 | |
78 | addps _sPoly_6(%rax), %xmm5 | |
79 | mulps %xmm1, %xmm5 | |
80 | addps _sPoly_5(%rax), %xmm5 | |
81 | mulps %xmm1, %xmm5 | |
82 | addps _sPoly_4(%rax), %xmm5 | |
83 | mulps %xmm1, %xmm5 | |
84 | addps _sPoly_3(%rax), %xmm5 | |
85 | mulps %xmm1, %xmm5 | |
86 | addps _sPoly_2(%rax), %xmm5 | |
87 | mulps %xmm1, %xmm5 | |
88 | addps _sPoly_1(%rax), %xmm5 | |
89 | mulps %xmm1, %xmm5 | |
90 | ||
91 | /* polynomial evaluation end */ | |
92 | mulps %xmm1, %xmm5 | |
93 | addps %xmm5, %xmm1 | |
94 | addps %xmm6, %xmm1 | |
95 | testl %ecx, %ecx | |
96 | jne .LBL_1_3 | |
97 | ||
98 | .LBL_1_2: | |
99 | cfi_remember_state | |
100 | movdqa %xmm1, %xmm0 | |
101 | movq %rbp, %rsp | |
102 | cfi_def_cfa_register (%rsp) | |
103 | popq %rbp | |
104 | cfi_adjust_cfa_offset (-8) | |
105 | cfi_restore (%rbp) | |
106 | ret | |
107 | ||
108 | .LBL_1_3: | |
109 | cfi_restore_state | |
110 | movups %xmm0, 192(%rsp) | |
111 | movups %xmm1, 256(%rsp) | |
112 | je .LBL_1_2 | |
113 | ||
114 | xorb %dl, %dl | |
115 | xorl %eax, %eax | |
116 | movups %xmm8, 112(%rsp) | |
117 | movups %xmm9, 96(%rsp) | |
118 | movups %xmm10, 80(%rsp) | |
119 | movups %xmm11, 64(%rsp) | |
120 | movups %xmm12, 48(%rsp) | |
121 | movups %xmm13, 32(%rsp) | |
122 | movups %xmm14, 16(%rsp) | |
123 | movups %xmm15, (%rsp) | |
124 | movq %rsi, 136(%rsp) | |
125 | movq %rdi, 128(%rsp) | |
126 | movq %r12, 168(%rsp) | |
127 | cfi_offset_rel_rsp (12, 168) | |
128 | movb %dl, %r12b | |
129 | movq %r13, 160(%rsp) | |
130 | cfi_offset_rel_rsp (13, 160) | |
131 | movl %ecx, %r13d | |
132 | movq %r14, 152(%rsp) | |
133 | cfi_offset_rel_rsp (14, 152) | |
134 | movl %eax, %r14d | |
135 | movq %r15, 144(%rsp) | |
136 | cfi_offset_rel_rsp (15, 144) | |
137 | cfi_remember_state | |
138 | ||
139 | .LBL_1_6: | |
140 | btl %r14d, %r13d | |
141 | jc .LBL_1_12 | |
142 | ||
143 | .LBL_1_7: | |
144 | lea 1(%r14), %esi | |
145 | btl %esi, %r13d | |
146 | jc .LBL_1_10 | |
147 | ||
148 | .LBL_1_8: | |
149 | incb %r12b | |
150 | addl $2, %r14d | |
151 | cmpb $16, %r12b | |
152 | jb .LBL_1_6 | |
153 | ||
154 | movups 112(%rsp), %xmm8 | |
155 | movups 96(%rsp), %xmm9 | |
156 | movups 80(%rsp), %xmm10 | |
157 | movups 64(%rsp), %xmm11 | |
158 | movups 48(%rsp), %xmm12 | |
159 | movups 32(%rsp), %xmm13 | |
160 | movups 16(%rsp), %xmm14 | |
161 | movups (%rsp), %xmm15 | |
162 | movq 136(%rsp), %rsi | |
163 | movq 128(%rsp), %rdi | |
164 | movq 168(%rsp), %r12 | |
165 | cfi_restore (%r12) | |
166 | movq 160(%rsp), %r13 | |
167 | cfi_restore (%r13) | |
168 | movq 152(%rsp), %r14 | |
169 | cfi_restore (%r14) | |
170 | movq 144(%rsp), %r15 | |
171 | cfi_restore (%r15) | |
172 | movups 256(%rsp), %xmm1 | |
173 | jmp .LBL_1_2 | |
174 | ||
175 | .LBL_1_10: | |
176 | cfi_restore_state | |
177 | movzbl %r12b, %r15d | |
178 | movss 196(%rsp,%r15,8), %xmm0 | |
179 | ||
d0007dc5 | 180 | call JUMPTARGET(logf) |
774488f8 AS |
181 | |
182 | movss %xmm0, 260(%rsp,%r15,8) | |
183 | jmp .LBL_1_8 | |
184 | ||
185 | .LBL_1_12: | |
186 | movzbl %r12b, %r15d | |
187 | movss 192(%rsp,%r15,8), %xmm0 | |
188 | ||
d0007dc5 | 189 | call JUMPTARGET(logf) |
774488f8 AS |
190 | |
191 | movss %xmm0, 256(%rsp,%r15,8) | |
192 | jmp .LBL_1_7 | |
193 | ||
194 | END (_ZGVbN4v_logf_sse4) |