| dnl PowerPC-64 mpn_lshift -- rp[] = up[] << cnt |
| |
| 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: 1.5 |
| C POWER4/PPC970: 3.0 |
| |
| C INPUT PARAMETERS |
| define(`rp',`r3') |
| define(`up',`r4') |
| define(`n',`r5') |
| define(`cnt',`r6') |
| |
| define(`tnc',`r5') |
| define(`v0',`r0') |
| define(`v1',`r7') |
| define(`u0',`r8') |
| define(`u1',`r9') |
| define(`h0',`r10') |
| define(`h1',`r11') |
| |
| |
| ASM_START() |
| PROLOGUE(mpn_lshift) |
| ifdef(`HAVE_ABI_mode32', |
| ` rldicl r7, r5, 0, 32 C zero extend n |
| mtctr r7', C copy n to count register |
| ` mtctr n') C copy n to count register |
| |
| ifdef(`HAVE_ABI_mode32', |
| ` rldic r0, n, 3, 32', C byte count corresponding to n |
| ` rldicr r0, n, 3, 60') C byte count corresponding to n |
| |
| add rp, rp, r0 C rp = rp + n |
| add up, up, r0 C up = up + n |
| addi rp, rp, 8 C rp now points 16 beyond end |
| addi up, up, -8 C up now points to last limb |
| subfic tnc, cnt, 64 C reverse shift count |
| |
| ld u0, 0(up) |
| sld h0, u0, cnt |
| srd r12, u0, tnc C return value |
| bdz L(1) C jump for n = 1 |
| |
| ld u1, -8(up) |
| bdz L(2) C jump for n = 2 |
| |
| ldu u0, -16(up) |
| bdz L(end) C jump for n = 3 |
| |
| L(oop): srd v1, u1, tnc |
| sld h1, u1, cnt |
| ld u1, -8(up) |
| or h0, v1, h0 |
| stdu h0, -16(rp) |
| |
| bdz L(exit) |
| |
| srd v0, u0, tnc |
| sld h0, u0, cnt |
| ldu u0, -16(up) |
| or h1, v0, h1 |
| std h1, -8(rp) |
| |
| bdnz L(oop) |
| |
| L(end): srd v1, u1, tnc |
| sld h1, u1, cnt |
| or h0, v1, h0 |
| stdu h0, -16(rp) |
| srd v0, u0, tnc |
| sld h0, u0, cnt |
| or h1, v0, h1 |
| std h1, -8(rp) |
| L(1): std h0, -16(rp) |
| ifdef(`HAVE_ABI_mode32', |
| ` srdi r3, r12, 32 |
| mr r4, r12 |
| ',` mr r3, r12 |
| ') |
| blr |
| |
| L(exit): srd v0, u0, tnc |
| sld h0, u0, cnt |
| or h1, v0, h1 |
| std h1, -8(rp) |
| L(2): srd v1, u1, tnc |
| sld h1, u1, cnt |
| or h0, v1, h0 |
| stdu h0, -16(rp) |
| std h1, -8(rp) |
| ifdef(`HAVE_ABI_mode32', |
| ` srdi r3, r12, 32 |
| mr r4, r12 |
| ',` mr r3, r12 |
| ') |
| blr |
| EPILOGUE() |
