| dnl HP-PA 2.0 mpn_rshift -- Right shift. |
| |
| dnl Copyright 1997, 2000, 2002, 2003 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/. |
| |
| |
| dnl This runs at 1.5 cycles/limb on PA8000 and 1.0 cycles/limb on PA8500. |
| |
| include(`../config.m4') |
| |
| dnl INPUT PARAMETERS |
| define(`rp',`%r26') |
| define(`up',`%r25') |
| define(`n',`%r24') |
| define(`cnt',`%r23') |
| |
| ifdef(`HAVE_ABI_2_0w', |
| ` .level 2.0w |
| ',` .level 2.0 |
| ') |
| PROLOGUE(mpn_rshift) |
| mtsar cnt |
| ldd 0(up), %r21 |
| addib,= -1, n, L(end) |
| shrpd %r21, %r0, %sar, %r29 C compute carry out limb |
| depw,z n, 31, 3, %r28 C r28 = (size & 7) |
| sub %r0, n, %r22 |
| depw,z %r22, 28, 3, %r22 C r22 = 8 * (-size & 7) |
| sub up, %r22, up C offset up |
| blr %r28, %r0 C branch into jump table |
| sub rp, %r22, rp C offset rp |
| b L(0) |
| nop |
| b L(1) |
| copy %r21, %r20 |
| b L(2) |
| nop |
| b L(3) |
| copy %r21, %r20 |
| b L(4) |
| nop |
| b L(5) |
| copy %r21, %r20 |
| b L(6) |
| nop |
| b L(7) |
| copy %r21, %r20 |
| |
| LDEF(loop) |
| LDEF(0) ldd 8(up), %r20 |
| shrpd %r20, %r21, %sar, %r21 |
| std %r21, 0(rp) |
| LDEF(7) ldd 16(up), %r21 |
| shrpd %r21, %r20, %sar, %r20 |
| std %r20, 8(rp) |
| LDEF(6) ldd 24(up), %r20 |
| shrpd %r20, %r21, %sar, %r21 |
| std %r21, 16(rp) |
| LDEF(5) ldd 32(up), %r21 |
| shrpd %r21, %r20, %sar, %r20 |
| std %r20, 24(rp) |
| LDEF(4) ldd 40(up), %r20 |
| shrpd %r20, %r21, %sar, %r21 |
| std %r21, 32(rp) |
| LDEF(3) ldd 48(up), %r21 |
| shrpd %r21, %r20, %sar, %r20 |
| std %r20, 40(rp) |
| LDEF(2) ldd 56(up), %r20 |
| shrpd %r20, %r21, %sar, %r21 |
| std %r21, 48(rp) |
| LDEF(1) ldd 64(up), %r21 |
| ldo 64(up), up |
| shrpd %r21, %r20, %sar, %r20 |
| std %r20, 56(rp) |
| addib,> -8, n, L(loop) |
| ldo 64(rp), rp |
| |
| LDEF(end) |
| shrpd %r0, %r21, %sar, %r21 |
| std %r21, 0(rp) |
| bve (%r2) |
| ifdef(`HAVE_ABI_2_0w', |
| ` copy %r29,%r28 |
| ',` extrd,u %r29, 31, 32, %r28 |
| ') |
| EPILOGUE(mpn_rshift) |
