github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/arm/neon/sec_tabselect.asm (about)

     1  dnl  ARM Neon mpn_sec_tabselect.
     2  
     3  dnl  Contributed to the GNU project by Torbjörn Granlund.
     4  
     5  dnl  Copyright 2011-2013 Free Software Foundation, Inc.
     6  
     7  dnl  This file is part of the GNU MP Library.
     8  dnl
     9  dnl  The GNU MP Library is free software; you can redistribute it and/or modify
    10  dnl  it under the terms of either:
    11  dnl
    12  dnl    * the GNU Lesser General Public License as published by the Free
    13  dnl      Software Foundation; either version 3 of the License, or (at your
    14  dnl      option) any later version.
    15  dnl
    16  dnl  or
    17  dnl
    18  dnl    * the GNU General Public License as published by the Free Software
    19  dnl      Foundation; either version 2 of the License, or (at your option) any
    20  dnl      later version.
    21  dnl
    22  dnl  or both in parallel, as here.
    23  dnl
    24  dnl  The GNU MP Library is distributed in the hope that it will be useful, but
    25  dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    26  dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    27  dnl  for more details.
    28  dnl
    29  dnl  You should have received copies of the GNU General Public License and the
    30  dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
    31  dnl  see https://www.gnu.org/licenses/.
    32  
    33  include(`../config.m4')
    34  
    35  
    36  C	     cycles/limb
    37  C StrongARM	 -
    38  C XScale	 -
    39  C Cortex-A7	 ?
    40  C Cortex-A8	 ?
    41  C Cortex-A9	 1.15
    42  C Cortex-A15	 0.65
    43  
    44  define(`rp',     `r0')
    45  define(`tp',     `r1')
    46  define(`n',      `r2')
    47  define(`nents',  `r3')
    48  C define(`which',  on stack)
    49  
    50  define(`i',      `r4')
    51  define(`j',      `r5')
    52  
    53  define(`maskq',  `q10')
    54  define(`maskd',  `d20')
    55  
    56  ASM_START()
    57  PROLOGUE(mpn_sec_tabselect)
    58  	push	{r4-r5}
    59  
    60  	add	  r4, sp, #8
    61  	vld1.32	  {d30[], d31[]}, [r4]	C 4 `which' copies
    62  	vmov.i32  q14, #1		C 4 copies of 1
    63  
    64  	subs	j, n, #8
    65  	bmi	L(outer_end)
    66  
    67  L(outer_top):
    68  	mov	  i, nents
    69  	mov	  r12, tp		C preserve tp
    70  	veor	  q13, q13, q13		C 4 counter copies
    71  	veor	  q2, q2, q2
    72  	veor	  q3, q3, q3
    73  	ALIGN(16)
    74  L(top):	vceq.i32  maskq, q13, q15	C compare idx copies to `which' copies
    75  	vld1.32	  {q0,q1}, [tp]
    76  	vadd.i32  q13, q13, q14
    77  	vbit	  q2, q0, maskq
    78  	vbit	  q3, q1, maskq
    79  	add	  tp, tp, n, lsl #2
    80  	subs	  i, i, #1
    81  	bne	  L(top)
    82  	vst1.32	  {q2,q3}, [rp]!
    83  	add	  tp, r12, #32		C restore tp, point to next slice
    84  	subs	  j, j, #8
    85  	bpl	  L(outer_top)
    86  L(outer_end):
    87  
    88  	tst	  n, #4
    89  	beq	  L(b0xx)
    90  L(b1xx):mov	  i, nents
    91  	mov	  r12, tp
    92  	veor	  q13, q13, q13
    93  	veor	  q2, q2, q2
    94  	ALIGN(16)
    95  L(tp4):	vceq.i32  maskq, q13, q15
    96  	vld1.32	  {q0}, [tp]
    97  	vadd.i32  q13, q13, q14
    98  	vbit	  q2, q0, maskq
    99  	add	  tp, tp, n, lsl #2
   100  	subs	  i, i, #1
   101  	bne	  L(tp4)
   102  	vst1.32	  {q2}, [rp]!
   103  	add	  tp, r12, #16
   104  
   105  L(b0xx):tst	  n, #2
   106  	beq	  L(b00x)
   107  L(b01x):mov	  i, nents
   108  	mov	  r12, tp
   109  	veor	  d26, d26, d26
   110  	veor	  d4, d4, d4
   111  	ALIGN(16)
   112  L(tp2):	vceq.i32  maskd, d26, d30
   113  	vld1.32	  {d0}, [tp]
   114  	vadd.i32  d26, d26, d28
   115  	vbit	  d4, d0, maskd
   116  	add	  tp, tp, n, lsl #2
   117  	subs	  i, i, #1
   118  	bne	  L(tp2)
   119  	vst1.32	  {d4}, [rp]!
   120  	add	  tp, r12, #8
   121  
   122  L(b00x):tst	  n, #1
   123  	beq	  L(b000)
   124  L(b001):mov	  i, nents
   125  	mov	  r12, tp
   126  	veor	  d26, d26, d26
   127  	veor	  d4, d4, d4
   128  	ALIGN(16)
   129  L(tp1):	vceq.i32  maskd, d26, d30
   130  	vld1.32	  {d0[0]}, [tp]
   131  	vadd.i32  d26, d26, d28
   132  	vbit	  d4, d0, maskd
   133  	add	  tp, tp, n, lsl #2
   134  	subs	  i, i, #1
   135  	bne	  L(tp1)
   136  	vst1.32	  {d4[0]}, [rp]
   137  
   138  L(b000):pop	{r4-r5}
   139  	bx	r14
   140  EPILOGUE()