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/*
*
* Optimized version of the standard copy_page() function
*
* Inputs:
* in0: address of target page
* in1: address of source page
* Output:
* no return value
*
* Copyright (C) 1999, 2001 Hewlett-Packard Co
* Stephane Eranian <eranian@hpl.hp.com>
* David Mosberger <davidm@hpl.hp.com>
*
* 4/06/01 davidm Tuned to make it perform well both for cached and uncached copies.
*/
#include <asm/asmmacro.h>
#include <asm/page.h>
#define PIPE_DEPTH 3
#define EPI p[PIPE_DEPTH-1]
#define lcount r16
#define saved_pr r17
#define saved_lc r18
#define saved_pfs r19
#define src1 r20
#define src2 r21
#define tgt1 r22
#define tgt2 r23
#define srcf r24
#define tgtf r25
#define tgt_last r26
#define Nrot ((8*PIPE_DEPTH+7)&~7)
GLOBAL_ENTRY(copy_page)
.prologue
.save ar.pfs, saved_pfs
alloc saved_pfs=ar.pfs,3,Nrot-3,0,Nrot
.rotr t1[PIPE_DEPTH], t2[PIPE_DEPTH], t3[PIPE_DEPTH], t4[PIPE_DEPTH], \
t5[PIPE_DEPTH], t6[PIPE_DEPTH], t7[PIPE_DEPTH], t8[PIPE_DEPTH]
.rotp p[PIPE_DEPTH]
.save ar.lc, saved_lc
mov saved_lc=ar.lc
mov ar.ec=PIPE_DEPTH
mov lcount=PAGE_SIZE/64-1
.save pr, saved_pr
mov saved_pr=pr
mov pr.rot=1<<16
.body
mov src1=in1
adds src2=8,in1
mov tgt_last = PAGE_SIZE
;;
adds tgt2=8,in0
add srcf=512,in1
mov ar.lc=lcount
mov tgt1=in0
add tgtf=512,in0
add tgt_last = tgt_last, in0
;;
1:
(p[0]) ld8 t1[0]=[src1],16
(EPI) st8 [tgt1]=t1[PIPE_DEPTH-1],16
(p[0]) ld8 t2[0]=[src2],16
(EPI) st8 [tgt2]=t2[PIPE_DEPTH-1],16
cmp.ltu p6,p0 = tgtf, tgt_last
;;
(p[0]) ld8 t3[0]=[src1],16
(EPI) st8 [tgt1]=t3[PIPE_DEPTH-1],16
(p[0]) ld8 t4[0]=[src2],16
(EPI) st8 [tgt2]=t4[PIPE_DEPTH-1],16
;;
(p[0]) ld8 t5[0]=[src1],16
(EPI) st8 [tgt1]=t5[PIPE_DEPTH-1],16
(p[0]) ld8 t6[0]=[src2],16
(EPI) st8 [tgt2]=t6[PIPE_DEPTH-1],16
;;
(p[0]) ld8 t7[0]=[src1],16
(EPI) st8 [tgt1]=t7[PIPE_DEPTH-1],16
(p[0]) ld8 t8[0]=[src2],16
(EPI) st8 [tgt2]=t8[PIPE_DEPTH-1],16
(p6) lfetch [srcf], 64
(p6) lfetch [tgtf], 64
br.ctop.sptk.few 1b
;;
mov pr=saved_pr,0xffffffffffff0000 // restore predicates
mov ar.pfs=saved_pfs
mov ar.lc=saved_lc
br.ret.sptk.many rp
END(copy_page)
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