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/* Function logf vectorized with SSE4.
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 (_ZGVbN4v_logf_sse4)
/*
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 $320, %rsp
/* reduction: compute r,n */
movaps %xmm0, %xmm2
/* check for working range,
set special argument mask (denormals/zero/Inf/NaN) */
movq __svml_slog_data@GOTPCREL(%rip), %rax
movdqu _iHiDelta(%rax), %xmm1
movdqu _iLoRange(%rax), %xmm4
paddd %xmm0, %xmm1
movdqu _iBrkValue(%rax), %xmm3
pcmpgtd %xmm1, %xmm4
movdqu _iOffExpoMask(%rax), %xmm1
psubd %xmm3, %xmm2
pand %xmm2, %xmm1
/* exponent_x (mantissa_x<4/3) or exponent_x+1 (mantissa_x>4/3) */
psrad $23, %xmm2
paddd %xmm3, %xmm1
movups _sPoly_7(%rax), %xmm5
/* mantissa_x (mantissa_x<4/3), or 0.5*mantissa_x (mantissa_x>4/3) */
cvtdq2ps %xmm2, %xmm6
/* reduced argument R */
subps _sOne(%rax), %xmm1
movmskps %xmm4, %ecx
/* final reconstruction:
add exponent_value*log2 to polynomial result */
mulps _sLn2(%rax), %xmm6
/* polynomial evaluation starts here */
mulps %xmm1, %xmm5
addps _sPoly_6(%rax), %xmm5
mulps %xmm1, %xmm5
addps _sPoly_5(%rax), %xmm5
mulps %xmm1, %xmm5
addps _sPoly_4(%rax), %xmm5
mulps %xmm1, %xmm5
addps _sPoly_3(%rax), %xmm5
mulps %xmm1, %xmm5
addps _sPoly_2(%rax), %xmm5
mulps %xmm1, %xmm5
addps _sPoly_1(%rax), %xmm5
mulps %xmm1, %xmm5
/* polynomial evaluation end */
mulps %xmm1, %xmm5
addps %xmm5, %xmm1
addps %xmm6, %xmm1
testl %ecx, %ecx
jne .LBL_1_3
.LBL_1_2:
cfi_remember_state
movdqa %xmm1, %xmm0
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
movups %xmm0, 192(%rsp)
movups %xmm1, 256(%rsp)
je .LBL_1_2
xorb %dl, %dl
xorl %eax, %eax
movups %xmm8, 112(%rsp)
movups %xmm9, 96(%rsp)
movups %xmm10, 80(%rsp)
movups %xmm11, 64(%rsp)
movups %xmm12, 48(%rsp)
movups %xmm13, 32(%rsp)
movups %xmm14, 16(%rsp)
movups %xmm15, (%rsp)
movq %rsi, 136(%rsp)
movq %rdi, 128(%rsp)
movq %r12, 168(%rsp)
cfi_offset_rel_rsp (12, 168)
movb %dl, %r12b
movq %r13, 160(%rsp)
cfi_offset_rel_rsp (13, 160)
movl %ecx, %r13d
movq %r14, 152(%rsp)
cfi_offset_rel_rsp (14, 152)
movl %eax, %r14d
movq %r15, 144(%rsp)
cfi_offset_rel_rsp (15, 144)
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
movups 112(%rsp), %xmm8
movups 96(%rsp), %xmm9
movups 80(%rsp), %xmm10
movups 64(%rsp), %xmm11
movups 48(%rsp), %xmm12
movups 32(%rsp), %xmm13
movups 16(%rsp), %xmm14
movups (%rsp), %xmm15
movq 136(%rsp), %rsi
movq 128(%rsp), %rdi
movq 168(%rsp), %r12
cfi_restore (%r12)
movq 160(%rsp), %r13
cfi_restore (%r13)
movq 152(%rsp), %r14
cfi_restore (%r14)
movq 144(%rsp), %r15
cfi_restore (%r15)
movups 256(%rsp), %xmm1
jmp .LBL_1_2
.LBL_1_10:
cfi_restore_state
movzbl %r12b, %r15d
movss 196(%rsp,%r15,8), %xmm0
call JUMPTARGET(__logf_finite)
movss %xmm0, 260(%rsp,%r15,8)
jmp .LBL_1_8
.LBL_1_12:
movzbl %r12b, %r15d
movss 192(%rsp,%r15,8), %xmm0
call JUMPTARGET(__logf_finite)
movss %xmm0, 256(%rsp,%r15,8)
jmp .LBL_1_7
END (_ZGVbN4v_logf_sse4)
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