vhdl achieve 8-bit parallel adder with Carry the simulation no problem.

adder8b\ADDER4B.v
.......\ADDER8B_map.xrpt
.......\ADDER4B.vhd
.......\ADDER8B_ngdbuild.xrpt
.......\ADDER8B.bld
.......\ADDER8B.cmd_log
.......\ADDER8B_pad.csv
.......\ADDER8B.fdo
.......\ADDER8B_pad.txt
.......\adder8b.gise
.......\ADDER8B_par.xrpt
.......\ADDER8B.lso
.......\adder8b_summary.html
.......\ADDER8B.ncd
.......\ADDER8B_summary.xml
.......\ADDER8B.ngc
.......\ADDER8B_usage.xml
.......\ADDER8B.ngd
.......\ADDER8B_vhdl.prj
.......\ADDER8B.ngr
.......\ADDER8B_wave.fdo
.......\ADDER8B.pad
.......\ADDER8B_xst.xrpt
.......\ADDER8B.par
.......\iseconfig\.xreport
.......\.........\adder8b.projectmgr
.......\.........\adder8b.xreport
.......\vsim.wlf
.......\ADDER8B.pcf
.......\work\@_opt\vopt007rww
.......\....\.....\vopt00nm22
.......\....\.....\voptae49yw
.......\....\.....\vopteys6yw
.......\....\.....\vopthef2yw
.......\....\.....\voptmeqzd1
.......\....\.....\voptszaw22
.......\....\.....\voptszvyww
.......\....\.....\voptwf0r22
.......\....\.....\voptxfhvww
.......\....\.....\_deps
.......\....\.....1\vopt1agcir
.......\....\......\vopt1seajr
.......\....\......\vopt5947jr
.......\....\......\vopt5t59ir
.......\....\......\vopt89y33q
.......\....\......\voptc960jv
.......\....\......\voptctg3ir
.......\....\......\voptga6zhr
.......\....\......\voptgsvxiv
.......\....\......\voptj9htiv
.......\....\......\voptjtvwhr
.......\....\......\voptnqchkr
.......\....\......\voptt72ekr
.......\....\......\voptt95jir
.......\....\......\voptxqqbkr
.......\....\......\vopty8sdjr
.......\....\......\voptystgir
.......\....\......\_deps
.......\....\adder4b\behavioral.dat
.......\....\.......\behavioral.dbs
.......\....\.......\_primary.dat
.......\....\.......\_primary.dbs
.......\....\.....8b\behave.dat
.......\....\.......\behave.dbs
.......\....\.......\behavioral.dat
.......\....\.......\behavioral.dbs
.......\....\.......\_primary.dat
.......\....\.......\_primary.dbs
.......\....\_info
.......\....\_vmake
.......\xst\work\hdllib.ref
.......\...\....\hdpdeps.ref
.......\...\....\sub00\vhpl00.vho
.......\...\....\.....\vhpl01.vho
.......\...\....\.....\vhpl02.vho
.......\...\....\.....\vhpl03.vho
.......\...\....\.....\vhpl04.vho
.......\wave.do
.......\ADDER8B.prj
.......\transcript
.......\_ngo\netlist.lst
.......\ADDER8B.ptwx
.......\webtalk_pn.xml
.......\ADDER8B.stx
.......\xlnx_auto_0_xdb\cst.xbcd
.......\ADDER8B.syr
.......\_xmsgs\map.xmsgs
.......\......\ngdbuild.xmsgs
.......\......\par.xmsgs
.......\......\pn_parser.xmsgs
.......\......\trce.xmsgs
.......\......\xst.xmsgs
.......\ADDER8B.twr
.......\ADDER8B.twx
.......\ADDER8B.udo
.......\ADDER8B.unroutes
.......\adder8b.vhd
.......\adder8b.xise
.......\ADDER8B.xpi
.......\ADDER8B.xst

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