nb_kernel332_ia32_sse2.s

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##
## $Id: nb_kernel332_ia32_sse2.s,v 1.1.2.2 2007/11/28 18:35:36 spoel Exp $
##
## Gromacs 4.0                         Copyright (c) 1991-2003 
## David van der Spoel, Erik Lindahl
##
## This program is free software; you can redistribute it and/or
## modify it under the terms of the GNU General Public License
## as published by the Free Software Foundation; either version 2
## of the License, or (at your option) any later version.
##
## To help us fund GROMACS development, we humbly ask that you cite
## the research papers on the package. Check out http://www.gromacs.org
## 
## And Hey:
## Gnomes, ROck Monsters And Chili Sauce
##



.globl nb_kernel332_ia32_sse2
.globl _nb_kernel332_ia32_sse2
nb_kernel332_ia32_sse2: 
_nb_kernel332_ia32_sse2:        
.set nb332_p_nri, 8
.set nb332_iinr, 12
.set nb332_jindex, 16
.set nb332_jjnr, 20
.set nb332_shift, 24
.set nb332_shiftvec, 28
.set nb332_fshift, 32
.set nb332_gid, 36
.set nb332_pos, 40
.set nb332_faction, 44
.set nb332_charge, 48
.set nb332_p_facel, 52
.set nb332_argkrf, 56
.set nb332_argcrf, 60
.set nb332_Vc, 64
.set nb332_type, 68
.set nb332_p_ntype, 72
.set nb332_vdwparam, 76
.set nb332_Vvdw, 80
.set nb332_p_tabscale, 84
.set nb332_VFtab, 88
.set nb332_invsqrta, 92
.set nb332_dvda, 96
.set nb332_p_gbtabscale, 100
.set nb332_GBtab, 104
.set nb332_p_nthreads, 108
.set nb332_count, 112
.set nb332_mtx, 116
.set nb332_outeriter, 120
.set nb332_inneriter, 124
.set nb332_work, 128
        ## stack offsets for local variables  
        ## bottom of stack is cache-aligned for sse2 use 
.set nb332_ixO, 0
.set nb332_iyO, 16
.set nb332_izO, 32
.set nb332_ixH1, 48
.set nb332_iyH1, 64
.set nb332_izH1, 80
.set nb332_ixH2, 96
.set nb332_iyH2, 112
.set nb332_izH2, 128
.set nb332_jxO, 144
.set nb332_jyO, 160
.set nb332_jzO, 176
.set nb332_jxH1, 192
.set nb332_jyH1, 208
.set nb332_jzH1, 224
.set nb332_jxH2, 240
.set nb332_jyH2, 256
.set nb332_jzH2, 272
.set nb332_dxOO, 288
.set nb332_dyOO, 304
.set nb332_dzOO, 320
.set nb332_dxOH1, 336
.set nb332_dyOH1, 352
.set nb332_dzOH1, 368
.set nb332_dxOH2, 384
.set nb332_dyOH2, 400
.set nb332_dzOH2, 416
.set nb332_dxH1O, 432
.set nb332_dyH1O, 448
.set nb332_dzH1O, 464
.set nb332_dxH1H1, 480
.set nb332_dyH1H1, 496
.set nb332_dzH1H1, 512
.set nb332_dxH1H2, 528
.set nb332_dyH1H2, 544
.set nb332_dzH1H2, 560
.set nb332_dxH2O, 576
.set nb332_dyH2O, 592
.set nb332_dzH2O, 608
.set nb332_dxH2H1, 624
.set nb332_dyH2H1, 640
.set nb332_dzH2H1, 656
.set nb332_dxH2H2, 672
.set nb332_dyH2H2, 688
.set nb332_dzH2H2, 704
.set nb332_qqOO, 720
.set nb332_qqOH, 736
.set nb332_qqHH, 752
.set nb332_two, 768
.set nb332_tsc, 784
.set nb332_c6, 800
.set nb332_c12, 816
.set nb332_vctot, 832
.set nb332_Vvdwtot, 848
.set nb332_fixO, 864
.set nb332_fiyO, 880
.set nb332_fizO, 896
.set nb332_fixH1, 912
.set nb332_fiyH1, 928
.set nb332_fizH1, 944
.set nb332_fixH2, 960
.set nb332_fiyH2, 976
.set nb332_fizH2, 992
.set nb332_fjxO, 1008
.set nb332_fjyO, 1024
.set nb332_fjzO, 1040
.set nb332_fjxH1, 1056
.set nb332_fjyH1, 1072
.set nb332_fjzH1, 1088
.set nb332_fjxH2, 1104
.set nb332_fjyH2, 1120
.set nb332_fjzH2, 1136
.set nb332_half, 1152
.set nb332_three, 1168
.set nb332_rsqOO, 1184
.set nb332_rsqOH1, 1200
.set nb332_rsqOH2, 1216
.set nb332_rsqH1O, 1232
.set nb332_rsqH1H1, 1248
.set nb332_rsqH1H2, 1264
.set nb332_rsqH2O, 1280
.set nb332_rsqH2H1, 1296
.set nb332_rsqH2H2, 1312
.set nb332_rinvOO, 1328
.set nb332_rinvOH1, 1344
.set nb332_rinvOH2, 1360
.set nb332_rinvH1O, 1376
.set nb332_rinvH1H1, 1392
.set nb332_rinvH1H2, 1408
.set nb332_rinvH2O, 1424
.set nb332_rinvH2H1, 1440
.set nb332_rinvH2H2, 1456
.set nb332_fscal, 1472
.set nb332_is3, 1488
.set nb332_ii3, 1492
.set nb332_innerjjnr, 1496
.set nb332_innerk, 1500
.set nb332_n, 1504
.set nb332_nn1, 1508
.set nb332_nri, 1512
.set nb332_nouter, 1516
.set nb332_ninner, 1520
.set nb332_salign, 1524
        pushl %ebp
        movl %esp,%ebp
        pushl %eax
        pushl %ebx
        pushl %ecx
        pushl %edx
        pushl %esi
        pushl %edi
        subl $1528,%esp         ## local stack space 
        movl %esp,%eax
        andl $0xf,%eax
        subl %eax,%esp
        movl %eax,nb332_salign(%esp)

        emms

        ## Move args passed by reference to stack
        movl nb332_p_nri(%ebp),%ecx
        movl (%ecx),%ecx
        movl %ecx,nb332_nri(%esp)

        ## zero iteration counters
        movl $0,%eax
        movl %eax,nb332_nouter(%esp)
        movl %eax,nb332_ninner(%esp)


        ## create constant floating-point factors on stack
        movl $0x00000000,%eax   ## lower half of double 0.5 IEEE (hex)
        movl $0x3fe00000,%ebx
        movl %eax,nb332_half(%esp)
        movl %ebx,nb332_half+4(%esp)
        movsd nb332_half(%esp),%xmm1
        shufpd $0,%xmm1,%xmm1  ## splat to all elements
        movapd %xmm1,%xmm3
        addpd  %xmm3,%xmm3      ## 1.0
        movapd %xmm3,%xmm2
        addpd  %xmm2,%xmm2      ## 2.0
        addpd  %xmm2,%xmm3      ## 3.0
        movapd %xmm1,nb332_half(%esp)
        movapd %xmm2,nb332_two(%esp)
        movapd %xmm3,nb332_three(%esp)
        movl nb332_p_tabscale(%ebp),%eax
        movsd (%eax),%xmm3

        shufpd $0,%xmm3,%xmm3
        movapd %xmm3,nb332_tsc(%esp)

        ## assume we have at least one i particle - start directly 
        movl  nb332_iinr(%ebp),%ecx         ## ecx = pointer into iinr[]        
        movl  (%ecx),%ebx           ## ebx =ii 

        movl  nb332_charge(%ebp),%edx
        movsd (%edx,%ebx,8),%xmm3
        movsd %xmm3,%xmm4
        movsd 8(%edx,%ebx,8),%xmm5
        movl nb332_p_facel(%ebp),%esi
        movsd (%esi),%xmm6
        mulsd  %xmm3,%xmm3
        mulsd  %xmm5,%xmm4
        mulsd  %xmm5,%xmm5
        mulsd  %xmm6,%xmm3
        mulsd  %xmm6,%xmm4
        mulsd  %xmm6,%xmm5
        shufpd $0,%xmm3,%xmm3
        shufpd $0,%xmm4,%xmm4
        shufpd $0,%xmm5,%xmm5
        movapd %xmm3,nb332_qqOO(%esp)
        movapd %xmm4,nb332_qqOH(%esp)
        movapd %xmm5,nb332_qqHH(%esp)

        xorpd %xmm0,%xmm0
        movl  nb332_type(%ebp),%edx
        movl  (%edx,%ebx,4),%ecx
        shll  %ecx
        movl  %ecx,%edx
        movl nb332_p_ntype(%ebp),%edi
        imull (%edi),%ecx     ## ecx = ntia = 2*ntype*type[ii0] 
        addl  %ecx,%edx
        movl  nb332_vdwparam(%ebp),%eax
        movlpd (%eax,%edx,8),%xmm0
        movlpd 8(%eax,%edx,8),%xmm1
        shufpd $0,%xmm0,%xmm0
        shufpd $0,%xmm1,%xmm1
        movapd %xmm0,nb332_c6(%esp)
        movapd %xmm1,nb332_c12(%esp)

_nb_kernel332_ia32_sse2.nb332_threadloop: 
        movl  nb332_count(%ebp),%esi            ## pointer to sync counter
        movl  (%esi),%eax
_nb_kernel332_ia32_sse2.nb332_spinlock: 
        movl  %eax,%ebx                         ## ebx=*count=nn0
        addl  $1,%ebx                          ## ebx=nn1=nn0+10
        lock 
        cmpxchgl %ebx,(%esi)                    ## write nn1 to *counter,
                                                ## if it hasnt changed.
                                                ## or reread *counter to eax.
        pause                                   ## -> better p4 performance
        jnz _nb_kernel332_ia32_sse2.nb332_spinlock

        ## if(nn1>nri) nn1=nri
        movl nb332_nri(%esp),%ecx
        movl %ecx,%edx
        subl %ebx,%ecx
        cmovlel %edx,%ebx                       ## if(nn1>nri) nn1=nri
        ## Cleared the spinlock if we got here.
        ## eax contains nn0, ebx contains nn1.
        movl %eax,nb332_n(%esp)
        movl %ebx,nb332_nn1(%esp)
        subl %eax,%ebx                          ## calc number of outer lists
        movl %eax,%esi                          ## copy n to esi
        jg  _nb_kernel332_ia32_sse2.nb332_outerstart
        jmp _nb_kernel332_ia32_sse2.nb332_end

_nb_kernel332_ia32_sse2.nb332_outerstart: 
        ## ebx contains number of outer iterations
        addl nb332_nouter(%esp),%ebx
        movl %ebx,nb332_nouter(%esp)

_nb_kernel332_ia32_sse2.nb332_outer: 
        movl  nb332_shift(%ebp),%eax        ## eax = pointer into shift[] 
        movl  (%eax,%esi,4),%ebx        ## ebx=shift[n] 

        leal  (%ebx,%ebx,2),%ebx    ## ebx=3*is 
        movl  %ebx,nb332_is3(%esp)      ## store is3 

        movl  nb332_shiftvec(%ebp),%eax     ## eax = base of shiftvec[] 

        movsd (%eax,%ebx,8),%xmm0
        movsd 8(%eax,%ebx,8),%xmm1
        movsd 16(%eax,%ebx,8),%xmm2

        movl  nb332_iinr(%ebp),%ecx         ## ecx = pointer into iinr[]        
        movl  (%ecx,%esi,4),%ebx    ## ebx =ii 

        leal  (%ebx,%ebx,2),%ebx        ## ebx = 3*ii=ii3 
        movl  nb332_pos(%ebp),%eax      ## eax = base of pos[]  
        movl  %ebx,nb332_ii3(%esp)

        movapd %xmm0,%xmm3
        movapd %xmm1,%xmm4
        movapd %xmm2,%xmm5
        addsd (%eax,%ebx,8),%xmm3
        addsd 8(%eax,%ebx,8),%xmm4
        addsd 16(%eax,%ebx,8),%xmm5
        shufpd $0,%xmm3,%xmm3
        shufpd $0,%xmm4,%xmm4
        shufpd $0,%xmm5,%xmm5
        movapd %xmm3,nb332_ixO(%esp)
        movapd %xmm4,nb332_iyO(%esp)
        movapd %xmm5,nb332_izO(%esp)

        movsd %xmm0,%xmm3
        movsd %xmm1,%xmm4
        movsd %xmm2,%xmm5
        addsd 24(%eax,%ebx,8),%xmm0
        addsd 32(%eax,%ebx,8),%xmm1
        addsd 40(%eax,%ebx,8),%xmm2
        addsd 48(%eax,%ebx,8),%xmm3
        addsd 56(%eax,%ebx,8),%xmm4
        addsd 64(%eax,%ebx,8),%xmm5

        shufpd $0,%xmm0,%xmm0
        shufpd $0,%xmm1,%xmm1
        shufpd $0,%xmm2,%xmm2
        shufpd $0,%xmm3,%xmm3
        shufpd $0,%xmm4,%xmm4
        shufpd $0,%xmm5,%xmm5
        movapd %xmm0,nb332_ixH1(%esp)
        movapd %xmm1,nb332_iyH1(%esp)
        movapd %xmm2,nb332_izH1(%esp)
        movapd %xmm3,nb332_ixH2(%esp)
        movapd %xmm4,nb332_iyH2(%esp)
        movapd %xmm5,nb332_izH2(%esp)

        ## clear vctot and i forces 
        xorpd %xmm4,%xmm4
        movapd %xmm4,nb332_vctot(%esp)
        movapd %xmm4,nb332_Vvdwtot(%esp)
        movapd %xmm4,nb332_fixO(%esp)
        movapd %xmm4,nb332_fiyO(%esp)
        movapd %xmm4,nb332_fizO(%esp)
        movapd %xmm4,nb332_fixH1(%esp)
        movapd %xmm4,nb332_fiyH1(%esp)
        movapd %xmm4,nb332_fizH1(%esp)
        movapd %xmm4,nb332_fixH2(%esp)
        movapd %xmm4,nb332_fiyH2(%esp)
        movapd %xmm4,nb332_fizH2(%esp)

        movl  nb332_jindex(%ebp),%eax
        movl  (%eax,%esi,4),%ecx             ## jindex[n] 
        movl  4(%eax,%esi,4),%edx            ## jindex[n+1] 
        subl  %ecx,%edx              ## number of innerloop atoms 

        movl  nb332_pos(%ebp),%esi
        movl  nb332_faction(%ebp),%edi
        movl  nb332_jjnr(%ebp),%eax
        shll  $2,%ecx
        addl  %ecx,%eax
        movl  %eax,nb332_innerjjnr(%esp)       ## pointer to jjnr[nj0] 
        movl  %edx,%ecx
        subl  $2,%edx
        addl  nb332_ninner(%esp),%ecx
        movl  %ecx,nb332_ninner(%esp)
        addl  $0,%edx
        movl  %edx,nb332_innerk(%esp)      ## number of innerloop atoms 
        jge   _nb_kernel332_ia32_sse2.nb332_unroll_loop
        jmp   _nb_kernel332_ia32_sse2.nb332_checksingle
_nb_kernel332_ia32_sse2.nb332_unroll_loop: 
        ## twice unrolled innerloop here 
        movl  nb332_innerjjnr(%esp),%edx       ## pointer to jjnr[k] 
        movl  (%edx),%eax
        movl  4(%edx),%ebx

        addl $8,nb332_innerjjnr(%esp)            ## advance pointer (unrolled 2)