rsh1sub_n.asm
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上传日期:2022-08-06
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- dnl PowerPC-64 mpn_rsh1sub_n -- rp[] = (up[] - vp[]) >> 1
- dnl Copyright 2003, 2005 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 POWER3/PPC630: 2 (1.5 c/l should be possible)
- C POWER4/PPC970: 4 (2.0 c/l should be possible)
- C INPUT PARAMETERS
- C rp r3
- C up r4
- C vp r5
- C n r6
- define(`rp',`r3')
- define(`up',`r4')
- define(`vp',`r5')
- define(`s0',`r6')
- define(`s1',`r7')
- define(`x',`r0')
- define(`u0',`r8')
- define(`u1',`r9')
- define(`v0',`r10')
- define(`v1',`r11')
- ASM_START()
- PROLOGUE(mpn_rsh1sub_n)
- mtctr r6 C copy size to count register
- addi rp, rp, -8
- ld u1, 0(up)
- ld v1, 0(vp)
- subfc x, v1, u1
- rldicl r12, x, 0, 63 C return value
- srdi s1, x, 1
- bdz L(1)
- ld u0, 8(up)
- ld v0, 8(vp)
- bdz L(end)
- L(oop): ldu u1, 16(up)
- ldu v1, 16(vp)
- subfe x, v0, u0
- srdi s0, x, 1
- rldimi s1, x, 63, 0
- std s1, 8(rp)
- bdz L(exit)
- ld u0, 8(up)
- ld v0, 8(vp)
- subfe x, v1, u1
- srdi s1, x, 1
- rldimi s0, x, 63, 0
- stdu s0, 16(rp)
- bdnz L(oop)
- L(end): subfe x, v0, u0
- srdi s0, x, 1
- rldimi s1, x, 63, 0
- std s1, 8(rp)
- subfe x, x, x
- rldimi s0, x, 63, 0
- std s0, 16(rp)
- mr r3, r12
- blr
- L(exit): subfe x, v1, u1
- srdi s1, x, 1
- rldimi s0, x, 63, 0
- stdu s0, 16(rp)
- L(1): subfe x, x, x
- rldimi s1, x, 63, 0
- std s1, 8(rp)
- mr r3, r12
- blr
- EPILOGUE()