/* Function exp 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_d_exp_data.h"

	.text

ENTRY (_ZGVdN4v_exp_avx2)

/*

   ALGORITHM DESCRIPTION:

     Argument representation:

     N = rint(X*2^k/ln2) = 2^k*M+j

     X = N*ln2/2^k + r = M*ln2 + ln2*(j/2^k) + r

     then -ln2/2^(k+1) < r < ln2/2^(k+1)

     Alternatively:

     N = trunc(X*2^k/ln2)

     then 0 < r < ln2/2^k

     Result calculation:

     exp(X) = exp(M*ln2 + ln2*(j/2^k) + r)

     = 2^M * 2^(j/2^k) * exp(r)

     2^M is calculated by bit manipulation

     2^(j/2^k) is stored in table

     exp(r) is approximated by polynomial

     The table lookup is skipped if k = 0.  */

        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_dexp_data@GOTPCREL(%rip), %rax

        vmovdqa   %ymm0, %ymm2

        vmovupd __dbInvLn2(%rax), %ymm3

        vmovupd __dbShifter(%rax), %ymm1

        vmovupd __lIndexMask(%rax), %ymm4

/* dM = X*dbInvLn2+dbShifter, dbInvLn2 = 2^k/Ln2 */

        vfmadd213pd %ymm1, %ymm2, %ymm3

/* iAbsX = (int)(lX>>32), lX = *(longlong*)&X */

        vextracti128 $1, %ymm2, %xmm5

        vshufps   $221, %xmm5, %xmm2, %xmm6

/* iAbsX = iAbsX&iAbsMask */

        vandps __iAbsMask(%rax), %xmm6, %xmm7

/* dN = dM-dbShifter, dN = rint(X*2^k/Ln2) */

        vsubpd    %ymm1, %ymm3, %ymm6

/* iRangeMask = (iAbsX>iDomainRange) */

        vpcmpgtd __iDomainRange(%rax), %xmm7, %xmm0

        vmovupd __dbLn2hi(%rax), %ymm1

        vmovupd __dPC0(%rax), %ymm7

/* Mask = iRangeMask?1:0, set mask for overflow/underflow */

        vmovmskps %xmm0, %ecx

        vmovupd __dPC2(%rax), %ymm0

/* dR = X - dN*dbLn2hi, dbLn2hi is 52-8-k hi bits of ln2/2^k */

        vmovdqa   %ymm2, %ymm5

        vfnmadd231pd %ymm6, %ymm1, %ymm5

/* dR = dR - dN*dbLn2lo, dbLn2lo is 40..94 bits of lo part of ln2/2^k */

        vfnmadd132pd __dbLn2lo(%rax), %ymm5, %ymm6

/* exp(r) = b0+r*(b0+r*(b1+r*b2)) */

        vfmadd213pd __dPC1(%rax), %ymm6, %ymm0

        vfmadd213pd %ymm7, %ymm6, %ymm0

        vfmadd213pd %ymm7, %ymm6, %ymm0

/* lIndex = (*(longlong*)&dM)&lIndexMask, lIndex is the lower K bits of lM */

        vandps    %ymm4, %ymm3, %ymm1

/* table lookup for dT[j] = 2^(j/2^k) */

        vxorpd    %ymm6, %ymm6, %ymm6

        vpcmpeqd  %ymm5, %ymm5, %ymm5

        vgatherqpd %ymm5, (%rax,%ymm1,8), %ymm6

/* lM = (*(longlong*)&dM)&(~lIndexMask) */

        vpandn    %ymm3, %ymm4, %ymm3

/* 2^(j/2^k) * exp(r) */

        vmulpd    %ymm0, %ymm6, %ymm0

/* lM = lM<<(52-K), 2^M */

        vpsllq    $42, %ymm3, %ymm4

/* multiply by 2^M through integer add */

        vpaddq    %ymm4, %ymm0, %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

        vmovupd   %ymm2, 320(%rsp)

        vmovupd   %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

        vmovupd   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

        shlq      $4, %r15

        vmovsd    328(%rsp,%r15), %xmm0

        vzeroupper

        call      JUMPTARGET(__exp_finite)

        vmovsd    %xmm0, 392(%rsp,%r15)

        jmp       .LBL_1_8

.LBL_1_12:

        movzbl    %r12b, %r15d

        shlq      $4, %r15

        vmovsd    320(%rsp,%r15), %xmm0

        vzeroupper

        call      JUMPTARGET(__exp_finite)

        vmovsd    %xmm0, 384(%rsp,%r15)

        jmp       .LBL_1_7

END (_ZGVdN4v_exp_avx2)