/* Function log2f vectorized with AVX-512.
   Copyright (C) 2021-2022 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
   https://www.gnu.org/licenses/.  */

/*
 * ALGORITHM DESCRIPTION:
 *
 *    Get short reciprocal approximation Rcp ~ 1/mantissa(x)
 *    R = Rcp*x - 1.0
 *    log2(x) = k - log2(Rcp) + poly_approximation(R)
 *       log2(Rcp) is tabulated
 *
 *
 */

/* Offsets for data table __svml_slog2_data_internal_avx512
 */
#define One                           	0
#define coeff4                        	64
#define coeff3                        	128
#define coeff2                        	192
#define coeff1                        	256

#include <sysdep.h>

        .text
	.section .text.exex512,"ax",@progbits
ENTRY(_ZGVeN16v_log2f_skx)
        pushq     %rbp
        cfi_def_cfa_offset(16)
        movq      %rsp, %rbp
        cfi_def_cfa(6, 16)
        cfi_offset(6, -16)
        andq      $-64, %rsp
        subq      $192, %rsp
        vgetmantps $11, {sae}, %zmm0, %zmm3
        vmovups   __svml_slog2_data_internal_avx512(%rip), %zmm1
        vgetexpps {sae}, %zmm0, %zmm5

/* x<=0? */
        vfpclassps $94, %zmm0, %k0
        vsubps    {rn-sae}, %zmm1, %zmm3, %zmm9
        vpsrld    $19, %zmm3, %zmm7
        vgetexpps {sae}, %zmm3, %zmm6
        vpermps   coeff4+__svml_slog2_data_internal_avx512(%rip), %zmm7, %zmm1
        vpermps   coeff3+__svml_slog2_data_internal_avx512(%rip), %zmm7, %zmm2
        vpermps   coeff2+__svml_slog2_data_internal_avx512(%rip), %zmm7, %zmm4
        vpermps   coeff1+__svml_slog2_data_internal_avx512(%rip), %zmm7, %zmm8
        vsubps    {rn-sae}, %zmm6, %zmm5, %zmm10
        vfmadd213ps {rn-sae}, %zmm2, %zmm9, %zmm1
        kmovw     %k0, %edx
        vfmadd213ps {rn-sae}, %zmm4, %zmm9, %zmm1
        vfmadd213ps {rn-sae}, %zmm8, %zmm9, %zmm1
        vfmadd213ps {rn-sae}, %zmm10, %zmm9, %zmm1
        testl     %edx, %edx

/* Go to special inputs processing branch */
        jne       L(SPECIAL_VALUES_BRANCH)
                                # LOE rbx r12 r13 r14 r15 edx zmm0 zmm1

/* Restore registers
 * and exit the function
 */

L(EXIT):
        vmovaps   %zmm1, %zmm0
        movq      %rbp, %rsp
        popq      %rbp
        cfi_def_cfa(7, 8)
        cfi_restore(6)
        ret
        cfi_def_cfa(6, 16)
        cfi_offset(6, -16)

/* Branch to process
 * special inputs
 */

L(SPECIAL_VALUES_BRANCH):
        vmovups   %zmm0, 64(%rsp)
        vmovups   %zmm1, 128(%rsp)
                                # LOE rbx r12 r13 r14 r15 edx zmm1

        xorl      %eax, %eax
                                # LOE rbx r12 r13 r14 r15 eax edx

        vzeroupper
        movq      %r12, 16(%rsp)
        /*  DW_CFA_expression: r12 (r12) (DW_OP_lit8; DW_OP_minus; DW_OP_const4s: -64; DW_OP_and; DW_OP_const4s: -176; DW_OP_plus)  */
        .cfi_escape 0x10, 0x0c, 0x0e, 0x38, 0x1c, 0x0d, 0xc0, 0xff, 0xff, 0xff, 0x1a, 0x0d, 0x50, 0xff, 0xff, 0xff, 0x22
        movl      %eax, %r12d
        movq      %r13, 8(%rsp)
        /*  DW_CFA_expression: r13 (r13) (DW_OP_lit8; DW_OP_minus; DW_OP_const4s: -64; DW_OP_and; DW_OP_const4s: -184; DW_OP_plus)  */
        .cfi_escape 0x10, 0x0d, 0x0e, 0x38, 0x1c, 0x0d, 0xc0, 0xff, 0xff, 0xff, 0x1a, 0x0d, 0x48, 0xff, 0xff, 0xff, 0x22
        movl      %edx, %r13d
        movq      %r14, (%rsp)
        /*  DW_CFA_expression: r14 (r14) (DW_OP_lit8; DW_OP_minus; DW_OP_const4s: -64; DW_OP_and; DW_OP_const4s: -192; DW_OP_plus)  */
        .cfi_escape 0x10, 0x0e, 0x0e, 0x38, 0x1c, 0x0d, 0xc0, 0xff, 0xff, 0xff, 0x1a, 0x0d, 0x40, 0xff, 0xff, 0xff, 0x22
                                # LOE rbx r15 r12d r13d

/* Range mask
 * bits check
 */

L(RANGEMASK_CHECK):
        btl       %r12d, %r13d

/* Call scalar math function */
        jc        L(SCALAR_MATH_CALL)
                                # LOE rbx r15 r12d r13d

/* Special inputs
 * processing loop
 */

L(SPECIAL_VALUES_LOOP):
        incl      %r12d
        cmpl      $16, %r12d

/* Check bits in range mask */
        jl        L(RANGEMASK_CHECK)
                                # LOE rbx r15 r12d r13d

        movq      16(%rsp), %r12
        cfi_restore(12)
        movq      8(%rsp), %r13
        cfi_restore(13)
        movq      (%rsp), %r14
        cfi_restore(14)
        vmovups   128(%rsp), %zmm1

/* Go to exit */
        jmp       L(EXIT)
        /*  DW_CFA_expression: r12 (r12) (DW_OP_lit8; DW_OP_minus; DW_OP_const4s: -64; DW_OP_and; DW_OP_const4s: -176; DW_OP_plus)  */
        .cfi_escape 0x10, 0x0c, 0x0e, 0x38, 0x1c, 0x0d, 0xc0, 0xff, 0xff, 0xff, 0x1a, 0x0d, 0x50, 0xff, 0xff, 0xff, 0x22
        /*  DW_CFA_expression: r13 (r13) (DW_OP_lit8; DW_OP_minus; DW_OP_const4s: -64; DW_OP_and; DW_OP_const4s: -184; DW_OP_plus)  */
        .cfi_escape 0x10, 0x0d, 0x0e, 0x38, 0x1c, 0x0d, 0xc0, 0xff, 0xff, 0xff, 0x1a, 0x0d, 0x48, 0xff, 0xff, 0xff, 0x22
        /*  DW_CFA_expression: r14 (r14) (DW_OP_lit8; DW_OP_minus; DW_OP_const4s: -64; DW_OP_and; DW_OP_const4s: -192; DW_OP_plus)  */
        .cfi_escape 0x10, 0x0e, 0x0e, 0x38, 0x1c, 0x0d, 0xc0, 0xff, 0xff, 0xff, 0x1a, 0x0d, 0x40, 0xff, 0xff, 0xff, 0x22
                                # LOE rbx r12 r13 r14 r15 zmm1

/* Scalar math fucntion call
 * to process special input
 */

L(SCALAR_MATH_CALL):
        movl      %r12d, %r14d
        movss     64(%rsp,%r14,4), %xmm0
        call      log2f@PLT
                                # LOE rbx r14 r15 r12d r13d xmm0

        movss     %xmm0, 128(%rsp,%r14,4)

/* Process special inputs in loop */
        jmp       L(SPECIAL_VALUES_LOOP)
                                # LOE rbx r15 r12d r13d
END(_ZGVeN16v_log2f_skx)

        .section .rodata, "a"
        .align 64

#ifdef __svml_slog2_data_internal_avx512_typedef
typedef unsigned int VUINT32;
typedef struct {
        __declspec(align(64)) VUINT32 One[16][1];
        __declspec(align(64)) VUINT32 coeff4[16][1];
        __declspec(align(64)) VUINT32 coeff3[16][1];
        __declspec(align(64)) VUINT32 coeff2[16][1];
        __declspec(align(64)) VUINT32 coeff1[16][1];
    } __svml_slog2_data_internal_avx512;
#endif
__svml_slog2_data_internal_avx512:
        /*== One ==*/
        .long 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000
        // c4
        .align 64
        .long 0xbea77e4a, 0xbe8aae3d
        .long 0xbe67fe32, 0xbe43d1b6
        .long 0xbe26a589, 0xbe0ee09b
        .long 0xbdf6a8a1, 0xbdd63b49
        .long 0xbf584e51, 0xbf3e80a1
        .long 0xbf2892f0, 0xbf15d377
        .long 0xbf05b525, 0xbeef8e30
        .long 0xbed75c8f, 0xbec24184
        // c3
        .align 64
        .long 0x3ef5910c, 0x3ef045a1
        .long 0x3ee7d87e, 0x3eddbb84
        .long 0x3ed2d6df, 0x3ec7bbd2
        .long 0x3ebcc42f, 0x3eb22616
        .long 0x3e8f3399, 0x3eb1223e
        .long 0x3ec9db4a, 0x3edb7a09
        .long 0x3ee79a1a, 0x3eef77cb
        .long 0x3ef407a4, 0x3ef607b4
        // c2
        .align 64
        .long 0xbf38a934, 0xbf387de6
        .long 0xbf37f6f0, 0xbf37048b
        .long 0xbf35a88a, 0xbf33ed04
        .long 0xbf31df56, 0xbf2f8d82
        .long 0xbf416814, 0xbf3daf58
        .long 0xbf3b5c08, 0xbf39fa2a
        .long 0xbf393713, 0xbf38d7e1
        .long 0xbf38b2cd, 0xbf38aa62
        // c1
        .align 64
        .long 0x3fb8aa3b, 0x3fb8a9c0
        .long 0x3fb8a6e8, 0x3fb89f4e
        .long 0x3fb890cb, 0x3fb879b1
        .long 0x3fb858d8, 0x3fb82d90
        .long 0x3fb8655e, 0x3fb8883a
        .long 0x3fb89aea, 0x3fb8a42f
        .long 0x3fb8a848, 0x3fb8a9c9
        .long 0x3fb8aa2f, 0x3fb8aa3b
        .align 64
        .type	__svml_slog2_data_internal_avx512,@object
        .size	__svml_slog2_data_internal_avx512,.-__svml_slog2_data_internal_avx512
