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/* Function log2f vectorized with AVX-512.
Copyright (C) 2021-2023 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>
.section .text.evex512, "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
vmovss 64(%rsp, %r14, 4), %xmm0
call log2f@PLT
# LOE rbx r14 r15 r12d r13d xmm0
vmovss %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
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