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/* 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)
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