LXR linux/arch/ia64/lib/copy

   1/*
   2 *
   3 * Optimized version of the standard copy_page() function
   4 *
   5 * Inputs:
   6 *      in0:    address of target page
   7 *      in1:    address of source page
   8 * Output:
   9 *      no return value
  10 *
  11 * Copyright (C) 1999, 2001 Hewlett-Packard Co
  12 *      Stephane Eranian <eranian@hpl.hp.com>
  13 *      David Mosberger <davidm@hpl.hp.com>
  14 *
  15 * 4/06/01 davidm       Tuned to make it perform well both for cached and uncached copies.
  16 */
  17#include <asm/asmmacro.h>
  18#include <asm/page.h>
  19
  20#define PIPE_DEPTH      3
  21#define EPI             p[PIPE_DEPTH-1]
  22
  23#define lcount          r16
  24#define saved_pr        r17
  25#define saved_lc        r18
  26#define saved_pfs       r19
  27#define src1            r20
  28#define src2            r21
  29#define tgt1            r22
  30#define tgt2            r23
  31#define srcf            r24
  32#define tgtf            r25
  33#define tgt_last        r26
  34
  35#define Nrot            ((8*PIPE_DEPTH+7)&~7)
  36
  37GLOBAL_ENTRY(copy_page)
  38        .prologue
  39        .save ar.pfs, saved_pfs
  40        alloc saved_pfs=ar.pfs,3,Nrot-3,0,Nrot
  41
  42        .rotr t1[PIPE_DEPTH], t2[PIPE_DEPTH], t3[PIPE_DEPTH], t4[PIPE_DEPTH], \
  43              t5[PIPE_DEPTH], t6[PIPE_DEPTH], t7[PIPE_DEPTH], t8[PIPE_DEPTH]
  44        .rotp p[PIPE_DEPTH]
  45
  46        .save ar.lc, saved_lc
  47        mov saved_lc=ar.lc
  48        mov ar.ec=PIPE_DEPTH
  49
  50        mov lcount=PAGE_SIZE/64-1
  51        .save pr, saved_pr
  52        mov saved_pr=pr
  53        mov pr.rot=1<<16
  54
  55        .body
  56
  57        mov src1=in1
  58        adds src2=8,in1
  59        mov tgt_last = PAGE_SIZE
  60        ;;
  61        adds tgt2=8,in0
  62        add srcf=512,in1
  63        mov ar.lc=lcount
  64        mov tgt1=in0
  65        add tgtf=512,in0
  66        add tgt_last = tgt_last, in0
  67        ;;
  681:
  69(p[0])  ld8 t1[0]=[src1],16
  70(EPI)   st8 [tgt1]=t1[PIPE_DEPTH-1],16
  71(p[0])  ld8 t2[0]=[src2],16
  72(EPI)   st8 [tgt2]=t2[PIPE_DEPTH-1],16
  73        cmp.ltu p6,p0 = tgtf, tgt_last
  74        ;;
  75(p[0])  ld8 t3[0]=[src1],16
  76(EPI)   st8 [tgt1]=t3[PIPE_DEPTH-1],16
  77(p[0])  ld8 t4[0]=[src2],16
  78(EPI)   st8 [tgt2]=t4[PIPE_DEPTH-1],16
  79        ;;
  80(p[0])  ld8 t5[0]=[src1],16
  81(EPI)   st8 [tgt1]=t5[PIPE_DEPTH-1],16
  82(p[0])  ld8 t6[0]=[src2],16
  83(EPI)   st8 [tgt2]=t6[PIPE_DEPTH-1],16
  84        ;;
  85(p[0])  ld8 t7[0]=[src1],16
  86(EPI)   st8 [tgt1]=t7[PIPE_DEPTH-1],16
  87(p[0])  ld8 t8[0]=[src2],16
  88(EPI)   st8 [tgt2]=t8[PIPE_DEPTH-1],16
  89
  90(p6)    lfetch [srcf], 64
  91(p6)    lfetch [tgtf], 64
  92        br.ctop.sptk.few 1b
  93        ;;
  94        mov pr=saved_pr,0xffffffffffff0000      // restore predicates
  95        mov ar.pfs=saved_pfs
  96        mov ar.lc=saved_lc
  97        br.ret.sptk.many rp
  98END(copy_page)
  99