1dnl PowerPC-64 mpn_lshift -- rp[] = up[] << cnt 2 3dnl Copyright 2003, 2005, 2010, 2013 Free Software Foundation, Inc. 4 5dnl This file is part of the GNU MP Library. 6dnl 7dnl The GNU MP Library is free software; you can redistribute it and/or modify 8dnl it under the terms of either: 9dnl 10dnl * the GNU Lesser General Public License as published by the Free 11dnl Software Foundation; either version 3 of the License, or (at your 12dnl option) any later version. 13dnl 14dnl or 15dnl 16dnl * the GNU General Public License as published by the Free Software 17dnl Foundation; either version 2 of the License, or (at your option) any 18dnl later version. 19dnl 20dnl or both in parallel, as here. 21dnl 22dnl The GNU MP Library is distributed in the hope that it will be useful, but 23dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 24dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 25dnl for more details. 26dnl 27dnl You should have received copies of the GNU General Public License and the 28dnl GNU Lesser General Public License along with the GNU MP Library. If not, 29dnl see https://www.gnu.org/licenses/. 30 31include(`../config.m4') 32 33C cycles/limb 34C POWER3/PPC630 ? 35C POWER4/PPC970 ? 36C POWER5 2.25 37C POWER6 4 38 39C TODO 40C * Micro-optimise header code 41C * Perhaps do 4-way unrolling, for 2.5 c/l on POWER6. The code is 4236 42C bytes, 4-way code would become about 50% larger. 43 44C INPUT PARAMETERS 45define(`rp_param', `r3') 46define(`up', `r4') 47define(`n', `r5') 48define(`cnt', `r6') 49 50define(`tnc',`r0') 51define(`retval',`r3') 52define(`rp', `r7') 53 54ASM_START() 55PROLOGUE(mpn_lshift,toc) 56 57ifdef(`HAVE_ABI_mode32',` 58 rldicl n, n, 0,32 C FIXME: avoid this zero extend 59') 60 mflr r12 61 sldi r8, n, 3 62 sldi r10, cnt, 6 C multiply cnt by size of a SHIFT block 63 LEAL( r11, L(e1)) C address of L(e1) label in SHIFT(1) 64 add up, up, r8 C make up point at end of up[] 65 add r11, r11, r10 C address of L(oN) for N = cnt 66 srdi r10, n, 1 67 add rp, rp_param, r8 C make rp point at end of rp[] 68 subfic tnc, cnt, 64 69 rlwinm. r8, n, 0,31,31 C extract bit 0 70 mtctr r10 71 beq L(evn) 72 73L(odd): ld r9, -8(up) 74 cmpdi cr0, n, 1 C n = 1? 75 beq L(1) 76 ld r8, -16(up) 77 addi r11, r11, -84 C L(o1) - L(e1) - 64 78 mtlr r11 79 srd r3, r9, tnc C retval 80 addi up, up, 8 81 addi rp, rp, -8 82 blr C branch to L(oN) 83 84L(evn): ld r8, -8(up) 85 ld r9, -16(up) 86 addi r11, r11, -64 87 mtlr r11 88 srd r3, r8, tnc C retval 89 blr C branch to L(eN) 90 91L(1): srd r3, r9, tnc C retval 92 sld r8, r9, cnt 93 std r8, -8(rp) 94 mtlr r12 95ifdef(`HAVE_ABI_mode32', 96` mr r4, r3 97 srdi r3, r3, 32 98') 99 blr 100 101 102define(SHIFT,` 103L(lo$1):ld r8, -24(up) 104 std r11, -8(rp) 105 addi rp, rp, -16 106L(o$1): srdi r10, r8, eval(64-$1) 107 rldimi r10, r9, $1, 0 108 ld r9, -32(up) 109 addi up, up, -16 110 std r10, 0(rp) 111L(e$1): srdi r11, r9, eval(64-$1) 112 rldimi r11, r8, $1, 0 113 bdnz L(lo$1) 114 std r11, -8(rp) 115 sldi r10, r9, $1 116 b L(com) 117 nop 118 nop 119') 120 121 ALIGN(64) 122forloop(`i',1,63,`SHIFT(i)') 123 124L(com): std r10, -16(rp) 125 mtlr r12 126ifdef(`HAVE_ABI_mode32', 127` mr r4, r3 128 srdi r3, r3, 32 129') 130 blr 131EPILOGUE() 132ASM_END() 133