rshift.asm
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上传日期:2022-08-06
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- dnl Alpha mpn_rshift -- Shift a number right.
- dnl Copyright 1994, 1995, 2000, 2009 Free Software Foundation, Inc.
- dnl This file is part of the GNU MP Library.
- dnl The GNU MP Library is free software; you can redistribute it and/or modify
- dnl it under the terms of the GNU Lesser General Public License as published
- dnl by the Free Software Foundation; either version 3 of the License, or (at
- dnl your option) any later version.
- dnl The GNU MP Library is distributed in the hope that it will be useful, but
- dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- dnl License for more details.
- dnl You should have received a copy of the GNU Lesser General Public License
- dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
- include(`../config.m4')
- C cycles/limb
- C EV4: ?
- C EV5: 3.25
- C EV6: 1.75
- C INPUT PARAMETERS
- C rp r16
- C up r17
- C n r18
- C cnt r19
- ASM_START()
- PROLOGUE(mpn_rshift)
- ldq r4,0(r17) C load first limb
- subq r31,r19,r20
- subq r18,1,r18
- and r18,4-1,r28 C number of limbs in first loop
- sll r4,r20,r0 C compute function result
- beq r28,L(L0)
- subq r18,r28,r18
- ALIGN(8)
- L(top0):
- ldq r3,8(r17)
- addq r16,8,r16
- srl r4,r19,r5
- addq r17,8,r17
- subq r28,1,r28
- sll r3,r20,r6
- bis r3,r3,r4
- bis r5,r6,r8
- stq r8,-8(r16)
- bne r28,L(top0)
- L(L0): srl r4,r19,r24
- beq r18,L(end)
- C warm up phase 1
- ldq r1,8(r17)
- subq r18,4,r18
- ldq r2,16(r17)
- ldq r3,24(r17)
- ldq r4,32(r17)
- C warm up phase 2
- sll r1,r20,r7
- srl r1,r19,r21
- sll r2,r20,r8
- beq r18,L(end1)
- ldq r1,40(r17)
- srl r2,r19,r22
- ldq r2,48(r17)
- sll r3,r20,r5
- bis r7,r24,r7
- srl r3,r19,r23
- bis r8,r21,r8
- sll r4,r20,r6
- ldq r3,56(r17)
- srl r4,r19,r24
- ldq r4,64(r17)
- subq r18,4,r18
- beq r18,L(end2)
- ALIGN(16)
- C main loop
- L(top): stq r7,0(r16)
- bis r5,r22,r5
- stq r8,8(r16)
- bis r6,r23,r6
- sll r1,r20,r7
- subq r18,4,r18
- srl r1,r19,r21
- unop C ldq r31,-96(r17)
- sll r2,r20,r8
- ldq r1,72(r17)
- srl r2,r19,r22
- ldq r2,80(r17)
- stq r5,16(r16)
- bis r7,r24,r7
- stq r6,24(r16)
- bis r8,r21,r8
- sll r3,r20,r5
- unop C ldq r31,-96(r17)
- srl r3,r19,r23
- addq r16,32,r16
- sll r4,r20,r6
- ldq r3,88(r17)
- srl r4,r19,r24
- ldq r4,96(r17)
- addq r17,32,r17
- bne r18,L(top)
- C cool down phase 2/1
- L(end2):
- stq r7,0(r16)
- bis r5,r22,r5
- stq r8,8(r16)
- bis r6,r23,r6
- sll r1,r20,r7
- srl r1,r19,r21
- sll r2,r20,r8
- srl r2,r19,r22
- stq r5,16(r16)
- bis r7,r24,r7
- stq r6,24(r16)
- bis r8,r21,r8
- sll r3,r20,r5
- srl r3,r19,r23
- sll r4,r20,r6
- srl r4,r19,r24
- C cool down phase 2/2
- stq r7,32(r16)
- bis r5,r22,r5
- stq r8,40(r16)
- bis r6,r23,r6
- stq r5,48(r16)
- stq r6,56(r16)
- C cool down phase 2/3
- stq r24,64(r16)
- ret r31,(r26),1
- C cool down phase 1/1
- L(end1):
- srl r2,r19,r22
- sll r3,r20,r5
- bis r7,r24,r7
- srl r3,r19,r23
- bis r8,r21,r8
- sll r4,r20,r6
- srl r4,r19,r24
- C cool down phase 1/2
- stq r7,0(r16)
- bis r5,r22,r5
- stq r8,8(r16)
- bis r6,r23,r6
- stq r5,16(r16)
- stq r6,24(r16)
- stq r24,32(r16)
- ret r31,(r26),1
- L(end): stq r24,0(r16)
- ret r31,(r26),1
- EPILOGUE(mpn_rshift)
- ASM_END()