! Copyright (C) 2008, 2010 Slava Pestov. ! See https://factorcode.org/license.txt for BSD license. USING: accessors alien.c-types kernel math math.constants math.functions math.vectors math.vectors.simd.cords math.parser combinators.smart sequences classes.struct specialized-arrays io ; IN: benchmark.nbody-simd : solar-mass ( -- x ) 4 pi sq * ; inline CONSTANT: days-per-year 365.24 STRUCT: body { location double-4 } { velocity double-4 } { mass double } ; SPECIALIZED-ARRAY: body : ( location velocity mass -- body ) [ days-per-year v*n ] [ solar-mass * ] bi* body boa ; inline : ( -- body ) double-4{ 4.84143144246472090e00 -1.16032004402742839e00 -1.03622044471123109e-01 0.0 } double-4{ 1.66007664274403694e-03 7.69901118419740425e-03 -6.90460016972063023e-05 0.0 } 9.54791938424326609e-04 ; : ( -- body ) double-4{ 8.34336671824457987e00 4.12479856412430479e00 -4.03523417114321381e-01 0.0 } double-4{ -2.76742510726862411e-03 4.99852801234917238e-03 2.30417297573763929e-05 0.0 } 2.85885980666130812e-04 ; : ( -- body ) double-4{ 1.28943695621391310e01 -1.51111514016986312e01 -2.23307578892655734e-01 0.0 } double-4{ 2.96460137564761618e-03 2.37847173959480950e-03 -2.96589568540237556e-05 0.0 } 4.36624404335156298e-05 ; : ( -- body ) double-4{ 1.53796971148509165e01 -2.59193146099879641e01 1.79258772950371181e-01 0.0 } double-4{ 2.68067772490389322e-03 1.62824170038242295e-03 -9.51592254519715870e-05 0.0 } 5.15138902046611451e-05 ; : ( -- body ) double-4{ 0 0 0 0 } double-4{ 0 0 0 0 } 1 ; : offset-momentum ( body offset -- body ) vneg solar-mass v/n >>velocity ; inline : init-bodies ( bodies -- ) [ first ] [ [ [ velocity>> ] [ mass>> ] bi v*n ] [ v+ ] map-reduce ] bi offset-momentum drop ; inline : ( -- system ) [ ] body-array{ } output>sequence dup init-bodies ; inline :: each-pair ( ... bodies pair-quot: ( ... other-body body -- ... ) each-quot: ( ... body -- ... ) -- ) bodies [| body i | body each-quot call bodies i 1 + tail-slice [ body pair-quot call ] each ] each-index ; inline : update-position ( body dt -- ) [ dup velocity>> ] dip '[ _ _ v*n v+ ] change-location drop ; inline : mag ( dt body other-body -- mag d ) [ location>> ] bi@ v- [ norm-sq dup sqrt * / ] keep ; inline :: update-velocity ( other-body body dt -- ) dt body other-body mag [ [ body ] 2dip '[ other-body mass>> _ * _ n*v v- ] change-velocity drop ] [ [ other-body ] 2dip '[ body mass>> _ * _ n*v v+ ] change-velocity drop ] 2bi ; inline : advance ( system dt -- ) [ '[ _ update-velocity ] [ drop ] each-pair ] [ '[ _ update-position ] each ] 2bi ; inline : inertia ( body -- e ) [ mass>> ] [ velocity>> norm-sq ] bi * 0.5 * ; inline : newton's-law ( other-body body -- e ) [ [ mass>> ] bi@ * ] [ [ location>> ] bi@ distance ] 2bi / ; inline : energy ( system -- x ) [ 0.0 ] dip [ newton's-law - ] [ inertia + ] each-pair ; inline : nbody ( n -- ) >fixnum [ energy number>string print ] [ '[ _ 0.01 advance ] times ] [ energy number>string print ] tri ; : nbody-simd-benchmark ( -- ) 1000000 nbody ; MAIN: nbody-simd-benchmark