dnl SPARC v9 mpn_add_n -- Add two limb vectors of the same length > 0 and dnl store sum in a third limb vector. dnl Copyright 2001-2003, 2011 Free Software Foundation, Inc. dnl This file is part of the GNU MP Library. dnl dnl The GNU MP Library is free software; you can redistribute it and/or modify dnl it under the terms of either: dnl dnl * the GNU Lesser General Public License as published by the Free dnl Software Foundation; either version 3 of the License, or (at your dnl option) any later version. dnl dnl or dnl dnl * the GNU General Public License as published by the Free Software dnl Foundation; either version 2 of the License, or (at your option) any dnl later version. dnl dnl or both in parallel, as here. dnl 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 General Public License dnl for more details. dnl dnl You should have received copies of the GNU General Public License and the dnl GNU Lesser General Public License along with the GNU MP Library. If not, dnl see https://www.gnu.org/licenses/. include(`../config.m4') C cycles/limb C UltraSPARC 1&2: 4 C UltraSPARC 3: 4.5 C Compute carry-out from the most significant bits of u,v, and r, where C r=u+v+carry_in, using logic operations. C This code runs at 4 cycles/limb on UltraSPARC 1 and 2. It has a 4 insn C recurrency, and the UltraSPARC 1 and 2 the IE units are 100% saturated. C Therefore, it seems futile to try to optimize this any further... C INPUT PARAMETERS define(`rp', `%i0') define(`up', `%i1') define(`vp', `%i2') define(`n', `%i3') define(`u0', `%l0') define(`u1', `%l2') define(`u2', `%l4') define(`u3', `%l6') define(`v0', `%l1') define(`v1', `%l3') define(`v2', `%l5') define(`v3', `%l7') define(`cy',`%i4') define(`fanop',`fitod %f0,%f2') dnl A quasi nop running in the FA pipe define(`fmnop',`fmuld %f0,%f0,%f4') dnl A quasi nop running in the FM pipe ASM_START() REGISTER(%g2,#scratch) REGISTER(%g3,#scratch) PROLOGUE(mpn_add_nc) save %sp,-160,%sp fitod %f0,%f0 C make sure f0 contains small, quiet number subcc n,4,%g0 bl,pn %xcc,.Loop0 nop b,a L(com) EPILOGUE() PROLOGUE(mpn_add_n) save %sp,-160,%sp fitod %f0,%f0 C make sure f0 contains small, quiet number subcc n,4,%g0 bl,pn %xcc,.Loop0 mov 0,cy L(com): ldx [up+0],u0 ldx [vp+0],v0 add up,32,up ldx [up-24],u1 ldx [vp+8],v1 add vp,32,vp ldx [up-16],u2 ldx [vp-16],v2 ldx [up-8],u3 ldx [vp-8],v3 subcc n,8,n add u0,v0,%g1 C main add add %g1,cy,%g5 C carry add or u0,v0,%g2 bl,pn %xcc,.Lend4567 fanop b,a .Loop .align 16 C START MAIN LOOP .Loop: andn %g2,%g5,%g2 and u0,v0,%g3 ldx [up+0],u0 fanop C -- or %g3,%g2,%g2 ldx [vp+0],v0 add up,32,up fanop C -- srlx %g2,63,cy add u1,v1,%g1 stx %g5,[rp+0] fanop C -- add %g1,cy,%g5 or u1,v1,%g2 fmnop fanop C -- andn %g2,%g5,%g2 and u1,v1,%g3 ldx [up-24],u1 fanop C -- or %g3,%g2,%g2 ldx [vp+8],v1 add vp,32,vp fanop C -- srlx %g2,63,cy add u2,v2,%g1 stx %g5,[rp+8] fanop C -- add %g1,cy,%g5 or u2,v2,%g2 fmnop fanop C -- andn %g2,%g5,%g2 and u2,v2,%g3 ldx [up-16],u2 fanop C -- or %g3,%g2,%g2 ldx [vp-16],v2 add rp,32,rp fanop C -- srlx %g2,63,cy add u3,v3,%g1 stx %g5,[rp-16] fanop C -- add %g1,cy,%g5 or u3,v3,%g2 fmnop fanop C -- andn %g2,%g5,%g2 and u3,v3,%g3 ldx [up-8],u3 fanop C -- or %g3,%g2,%g2 subcc n,4,n ldx [vp-8],v3 fanop C -- srlx %g2,63,cy add u0,v0,%g1 stx %g5,[rp-8] fanop C -- add %g1,cy,%g5 or u0,v0,%g2 bge,pt %xcc,.Loop fanop C END MAIN LOOP .Lend4567: andn %g2,%g5,%g2 and u0,v0,%g3 or %g3,%g2,%g2 srlx %g2,63,cy add u1,v1,%g1 stx %g5,[rp+0] add %g1,cy,%g5 or u1,v1,%g2 andn %g2,%g5,%g2 and u1,v1,%g3 or %g3,%g2,%g2 srlx %g2,63,cy add u2,v2,%g1 stx %g5,[rp+8] add %g1,cy,%g5 or u2,v2,%g2 andn %g2,%g5,%g2 and u2,v2,%g3 or %g3,%g2,%g2 add rp,32,rp srlx %g2,63,cy add u3,v3,%g1 stx %g5,[rp-16] add %g1,cy,%g5 or u3,v3,%g2 andn %g2,%g5,%g2 and u3,v3,%g3 or %g3,%g2,%g2 srlx %g2,63,cy stx %g5,[rp-8] addcc n,4,n bz,pn %xcc,.Lret fanop .Loop0: ldx [up],u0 add up,8,up ldx [vp],v0 add vp,8,vp add rp,8,rp subcc n,1,n add u0,v0,%g1 or u0,v0,%g2 add %g1,cy,%g5 and u0,v0,%g3 andn %g2,%g5,%g2 stx %g5,[rp-8] or %g3,%g2,%g2 bnz,pt %xcc,.Loop0 srlx %g2,63,cy .Lret: mov cy,%i0 ret restore EPILOGUE()