| /* Function logf vectorized with AVX2. |
| Copyright (C) 2014-2018 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> |
| #include "svml_s_logf_data.h" |
| |
| .text |
| ENTRY(_ZGVdN8v_logf_avx2) |
| /* |
| ALGORITHM DESCRIPTION: |
| |
| log(x) = exponent_x*log(2) + log(mantissa_x), if mantissa_x<4/3 |
| log(x) = (exponent_x+1)*log(2) + log(0.5*mantissa_x), if mantissa_x>4/3 |
| |
| R = mantissa_x - 1, if mantissa_x<4/3 |
| R = 0.5*mantissa_x - 1, if mantissa_x>4/3 |
| |R|< 1/3 |
| |
| log(1+R) is approximated as a polynomial: degree 9 for 1-ulp, |
| degree 7 for 4-ulp, degree 3 for half-precision. */ |
| |
| pushq %rbp |
| cfi_adjust_cfa_offset (8) |
| cfi_rel_offset (%rbp, 0) |
| movq %rsp, %rbp |
| cfi_def_cfa_register (%rbp) |
| andq $-64, %rsp |
| subq $448, %rsp |
| movq __svml_slog_data@GOTPCREL(%rip), %rax |
| vmovaps %ymm0, %ymm2 |
| vmovups _iBrkValue(%rax), %ymm6 |
| vmovups _iLoRange(%rax), %ymm1 |
| /* check for working range, |
| set special argument mask (denormals/zero/Inf/NaN) */ |
| vpaddd _iHiDelta(%rax), %ymm2, %ymm7 |
| |
| /* reduction: compute r,n */ |
| vpsubd %ymm6, %ymm2, %ymm4 |
| |
| /* exponent_x (mantissa_x<4/3) or exponent_x+1 (mantissa_x>4/3) */ |
| vpsrad $23, %ymm4, %ymm3 |
| vpand _iOffExpoMask(%rax), %ymm4, %ymm5 |
| vmovups _sPoly_7(%rax), %ymm4 |
| vcvtdq2ps %ymm3, %ymm0 |
| |
| /* mantissa_x (mantissa_x<4/3), or 0.5*mantissa_x (mantissa_x>4/3) */ |
| vpaddd %ymm6, %ymm5, %ymm3 |
| |
| /* reduced argument R */ |
| vsubps _sOne(%rax), %ymm3, %ymm5 |
| |
| /* polynomial evaluation starts here */ |
| vfmadd213ps _sPoly_6(%rax), %ymm5, %ymm4 |
| vfmadd213ps _sPoly_5(%rax), %ymm5, %ymm4 |
| vfmadd213ps _sPoly_4(%rax), %ymm5, %ymm4 |
| vfmadd213ps _sPoly_3(%rax), %ymm5, %ymm4 |
| vfmadd213ps _sPoly_2(%rax), %ymm5, %ymm4 |
| vfmadd213ps _sPoly_1(%rax), %ymm5, %ymm4 |
| vmulps %ymm5, %ymm4, %ymm6 |
| |
| /* polynomial evaluation end */ |
| vfmadd213ps %ymm5, %ymm5, %ymm6 |
| vpcmpgtd %ymm7, %ymm1, %ymm1 |
| vmovmskps %ymm1, %ecx |
| |
| /* final reconstruction: |
| add exponent_value*log2 to polynomial result */ |
| vfmadd132ps _sLn2(%rax), %ymm6, %ymm0 |
| testl %ecx, %ecx |
| jne .LBL_1_3 |
| |
| .LBL_1_2: |
| cfi_remember_state |
| movq %rbp, %rsp |
| cfi_def_cfa_register (%rsp) |
| popq %rbp |
| cfi_adjust_cfa_offset (-8) |
| cfi_restore (%rbp) |
| ret |
| |
| .LBL_1_3: |
| cfi_restore_state |
| vmovups %ymm2, 320(%rsp) |
| vmovups %ymm0, 384(%rsp) |
| je .LBL_1_2 |
| |
| xorb %dl, %dl |
| xorl %eax, %eax |
| vmovups %ymm8, 224(%rsp) |
| vmovups %ymm9, 192(%rsp) |
| vmovups %ymm10, 160(%rsp) |
| vmovups %ymm11, 128(%rsp) |
| vmovups %ymm12, 96(%rsp) |
| vmovups %ymm13, 64(%rsp) |
| vmovups %ymm14, 32(%rsp) |
| vmovups %ymm15, (%rsp) |
| movq %rsi, 264(%rsp) |
| movq %rdi, 256(%rsp) |
| movq %r12, 296(%rsp) |
| cfi_offset_rel_rsp (12, 296) |
| movb %dl, %r12b |
| movq %r13, 288(%rsp) |
| cfi_offset_rel_rsp (13, 288) |
| movl %ecx, %r13d |
| movq %r14, 280(%rsp) |
| cfi_offset_rel_rsp (14, 280) |
| movl %eax, %r14d |
| movq %r15, 272(%rsp) |
| cfi_offset_rel_rsp (15, 272) |
| cfi_remember_state |
| |
| .LBL_1_6: |
| btl %r14d, %r13d |
| jc .LBL_1_12 |
| |
| .LBL_1_7: |
| lea 1(%r14), %esi |
| btl %esi, %r13d |
| jc .LBL_1_10 |
| |
| .LBL_1_8: |
| incb %r12b |
| addl $2, %r14d |
| cmpb $16, %r12b |
| jb .LBL_1_6 |
| |
| vmovups 224(%rsp), %ymm8 |
| vmovups 192(%rsp), %ymm9 |
| vmovups 160(%rsp), %ymm10 |
| vmovups 128(%rsp), %ymm11 |
| vmovups 96(%rsp), %ymm12 |
| vmovups 64(%rsp), %ymm13 |
| vmovups 32(%rsp), %ymm14 |
| vmovups (%rsp), %ymm15 |
| vmovups 384(%rsp), %ymm0 |
| movq 264(%rsp), %rsi |
| movq 256(%rsp), %rdi |
| movq 296(%rsp), %r12 |
| cfi_restore (%r12) |
| movq 288(%rsp), %r13 |
| cfi_restore (%r13) |
| movq 280(%rsp), %r14 |
| cfi_restore (%r14) |
| movq 272(%rsp), %r15 |
| cfi_restore (%r15) |
| jmp .LBL_1_2 |
| |
| .LBL_1_10: |
| cfi_restore_state |
| movzbl %r12b, %r15d |
| vmovss 324(%rsp,%r15,8), %xmm0 |
| vzeroupper |
| |
| call JUMPTARGET(__logf_finite) |
| |
| vmovss %xmm0, 388(%rsp,%r15,8) |
| jmp .LBL_1_8 |
| |
| .LBL_1_12: |
| movzbl %r12b, %r15d |
| vmovss 320(%rsp,%r15,8), %xmm0 |
| vzeroupper |
| |
| call JUMPTARGET(__logf_finite) |
| |
| vmovss %xmm0, 384(%rsp,%r15,8) |
| jmp .LBL_1_7 |
| |
| END(_ZGVdN8v_logf_avx2) |
