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/* Function exp2f vectorized with AVX2.
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:
*
* exp2(x) = 2^n * T[j] * (1 + P(y))
* where
* x = m*(1/K) + y, y in [-1/K..1/K]
* m = n*K + j, m, n,j - signed integer, j in [-K/2..K/2]
*
* values of 2^j/K are tabulated
*
* P(y) is a minimax polynomial approximation of exp2(x)-1
* on small interval [-1/K..1/K]
*
* Special cases:
*
* exp2(NaN) = NaN
* exp2(+INF) = +INF
* exp2(-INF) = 0
* exp2(x) = 1 for subnormals
* For IEEE float
* if x >= 128.0 then exp2f(x) overflow
* if x < -151.0 then exp2f(x) underflow
*
*/
/* Offsets for data table __svml_sexp2_data_internal
*/
#define _sShifter 0
#define _sPC0 32
#define _sPC1 64
#define _sPC2 96
#define _sPC3 128
#define _sPC4 160
#define _sPC5 192
#define _sPC6 224
#define _iAbsMask 256
#define _iDomainRange 288
#include <sysdep.h>
.section .text.avx2, "ax", @progbits
ENTRY(_ZGVdN8v_exp2f_avx2)
pushq %rbp
cfi_def_cfa_offset(16)
movq %rsp, %rbp
cfi_def_cfa(6, 16)
cfi_offset(6, -16)
andq $-32, %rsp
subq $96, %rsp
vmovups __svml_sexp2_data_internal(%rip), %ymm1
/* Check for overflow\underflow */
vmovups _sPC6+__svml_sexp2_data_internal(%rip), %ymm7
/* Implementation */
vaddps %ymm1, %ymm0, %ymm6
vsubps %ymm1, %ymm6, %ymm4
/* 2^N */
vpslld $23, %ymm6, %ymm8
/* R */
vsubps %ymm4, %ymm0, %ymm5
/* Polynomial */
vfmadd213ps _sPC5+__svml_sexp2_data_internal(%rip), %ymm5, %ymm7
vfmadd213ps _sPC4+__svml_sexp2_data_internal(%rip), %ymm5, %ymm7
vfmadd213ps _sPC3+__svml_sexp2_data_internal(%rip), %ymm5, %ymm7
vfmadd213ps _sPC2+__svml_sexp2_data_internal(%rip), %ymm5, %ymm7
vfmadd213ps _sPC1+__svml_sexp2_data_internal(%rip), %ymm5, %ymm7
vfmadd213ps _sPC0+__svml_sexp2_data_internal(%rip), %ymm5, %ymm7
/* Check for overflow\underflow */
vandps _iAbsMask+__svml_sexp2_data_internal(%rip), %ymm0, %ymm2
vpcmpgtd _iDomainRange+__svml_sexp2_data_internal(%rip), %ymm2, %ymm3
vmovmskps %ymm3, %edx
/* Reconstruction */
vpaddd %ymm8, %ymm7, %ymm1
testl %edx, %edx
/* Go to special inputs processing branch */
jne L(SPECIAL_VALUES_BRANCH)
# LOE rbx r12 r13 r14 r15 edx ymm0 ymm1
/* Restore registers
* and exit the function
*/
L(EXIT):
vmovaps %ymm1, %ymm0
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 %ymm0, 32(%rsp)
vmovups %ymm1, 64(%rsp)
# LOE rbx r12 r13 r14 r15 edx ymm1
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: -32; DW_OP_and; DW_OP_const4s: -80; DW_OP_plus) */
.cfi_escape 0x10, 0x0c, 0x0e, 0x38, 0x1c, 0x0d, 0xe0, 0xff, 0xff, 0xff, 0x1a, 0x0d, 0xb0, 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: -32; DW_OP_and; DW_OP_const4s: -88; DW_OP_plus) */
.cfi_escape 0x10, 0x0d, 0x0e, 0x38, 0x1c, 0x0d, 0xe0, 0xff, 0xff, 0xff, 0x1a, 0x0d, 0xa8, 0xff, 0xff, 0xff, 0x22
movl %edx, %r13d
movq %r14, (%rsp)
/* DW_CFA_expression: r14 (r14) (DW_OP_lit8; DW_OP_minus; DW_OP_const4s: -32; DW_OP_and; DW_OP_const4s: -96; DW_OP_plus) */
.cfi_escape 0x10, 0x0e, 0x0e, 0x38, 0x1c, 0x0d, 0xe0, 0xff, 0xff, 0xff, 0x1a, 0x0d, 0xa0, 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 $8, %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 64(%rsp), %ymm1
/* Go to exit */
jmp L(EXIT)
/* DW_CFA_expression: r12 (r12) (DW_OP_lit8; DW_OP_minus; DW_OP_const4s: -32; DW_OP_and; DW_OP_const4s: -80; DW_OP_plus) */
.cfi_escape 0x10, 0x0c, 0x0e, 0x38, 0x1c, 0x0d, 0xe0, 0xff, 0xff, 0xff, 0x1a, 0x0d, 0xb0, 0xff, 0xff, 0xff, 0x22
/* DW_CFA_expression: r13 (r13) (DW_OP_lit8; DW_OP_minus; DW_OP_const4s: -32; DW_OP_and; DW_OP_const4s: -88; DW_OP_plus) */
.cfi_escape 0x10, 0x0d, 0x0e, 0x38, 0x1c, 0x0d, 0xe0, 0xff, 0xff, 0xff, 0x1a, 0x0d, 0xa8, 0xff, 0xff, 0xff, 0x22
/* DW_CFA_expression: r14 (r14) (DW_OP_lit8; DW_OP_minus; DW_OP_const4s: -32; DW_OP_and; DW_OP_const4s: -96; DW_OP_plus) */
.cfi_escape 0x10, 0x0e, 0x0e, 0x38, 0x1c, 0x0d, 0xe0, 0xff, 0xff, 0xff, 0x1a, 0x0d, 0xa0, 0xff, 0xff, 0xff, 0x22
# LOE rbx r12 r13 r14 r15 ymm1
/* Scalar math function call
* to process special input
*/
L(SCALAR_MATH_CALL):
movl %r12d, %r14d
vmovss 32(%rsp, %r14, 4), %xmm0
call exp2f@PLT
# LOE rbx r14 r15 r12d r13d xmm0
vmovss %xmm0, 64(%rsp, %r14, 4)
/* Process special inputs in loop */
jmp L(SPECIAL_VALUES_LOOP)
# LOE rbx r15 r12d r13d
END(_ZGVdN8v_exp2f_avx2)
.section .rodata, "a"
.align 32
#ifdef __svml_sexp2_data_internal_typedef
typedef unsigned int VUINT32;
typedef struct {
__declspec(align(32)) VUINT32 _sShifter[8][1];
__declspec(align(32)) VUINT32 _sPC0[8][1];
__declspec(align(32)) VUINT32 _sPC1[8][1];
__declspec(align(32)) VUINT32 _sPC2[8][1];
__declspec(align(32)) VUINT32 _sPC3[8][1];
__declspec(align(32)) VUINT32 _sPC4[8][1];
__declspec(align(32)) VUINT32 _sPC5[8][1];
__declspec(align(32)) VUINT32 _sPC6[8][1];
__declspec(align(32)) VUINT32 _iAbsMask[8][1];
__declspec(align(32)) VUINT32 _iDomainRange[8][1];
} __svml_sexp2_data_internal;
#endif
__svml_sexp2_data_internal:
.long 0x4b400000, 0x4b400000, 0x4b400000, 0x4b400000, 0x4b400000, 0x4b400000, 0x4b400000, 0x4b400000 /* _sShifter */
.align 32
.long 0x3F800000, 0x3F800000, 0x3F800000, 0x3F800000, 0x3F800000, 0x3F800000, 0x3F800000, 0x3F800000 /* _sPC0 */
.align 32
.long 0x3f317218, 0x3f317218, 0x3f317218, 0x3f317218, 0x3f317218, 0x3f317218, 0x3f317218, 0x3f317218 /* _sPC1 */
.align 32
.long 0x3e75fdef, 0x3e75fdef, 0x3e75fdef, 0x3e75fdef, 0x3e75fdef, 0x3e75fdef, 0x3e75fdef, 0x3e75fdef /* _sPC2 */
.align 32
.long 0x3d6357cf, 0x3d6357cf, 0x3d6357cf, 0x3d6357cf, 0x3d6357cf, 0x3d6357cf, 0x3d6357cf, 0x3d6357cf /* _sPC3 */
.align 32
.long 0x3c1d962c, 0x3c1d962c, 0x3c1d962c, 0x3c1d962c, 0x3c1d962c, 0x3c1d962c, 0x3c1d962c, 0x3c1d962c /* _sPC4 */
.align 32
.long 0x3aaf7a51, 0x3aaf7a51, 0x3aaf7a51, 0x3aaf7a51, 0x3aaf7a51, 0x3aaf7a51, 0x3aaf7a51, 0x3aaf7a51 /* _sPC5 */
.align 32
.long 0x39213c8c, 0x39213c8c, 0x39213c8c, 0x39213c8c, 0x39213c8c, 0x39213c8c, 0x39213c8c, 0x39213c8c /* _sPC6 */
//common
.align 32
.long 0x7fffffff, 0x7fffffff, 0x7fffffff, 0x7fffffff, 0x7fffffff, 0x7fffffff, 0x7fffffff, 0x7fffffff /* _iAbsMask */
.align 32
.long 0x42fc0000, 0x42fc0000, 0x42fc0000, 0x42fc0000, 0x42fc0000, 0x42fc0000, 0x42fc0000, 0x42fc0000 /* _iDomainRange=126.0 */
.align 32
.type __svml_sexp2_data_internal, @object
.size __svml_sexp2_data_internal, .-__svml_sexp2_data_internal
|
