#define BLOCK_SIZE 64
#define SHORTCOPY 3
#define SHORTCHECK 14
#define SHORT_LONG 64/* max copy for short longword-aligned case */ /* must be at least 64 */
#define SMALL_MAX 128
#define MED_UMAX 1024/* max copy for medium un-aligned case */
#define MED_WMAX 1024/* max copy for medium word-aligned case */
#define MED_MAX 1024/* max copy for medium longword-aligned case */
#define ST_CHUNK 24/* ST_CHUNK - block of values for BIS Store */
#define ALIGN_PRE 24/* distance for aligned prefetch loop */
! %o5 has the bytes to be written in partial store. sub %o2, %o5, %o2 sub %o1, %o0, %o1 ! %o1 gets the difference 7: ! dst aligning loop
add %o1, %o0, %o4
EX_LD(LOAD(ldub, %o4, %o4), memcpy_retl_o2_plus_o5) ! load one byte
subcc %o5, 1, %o5
EX_ST(STORE(stb, %o4, %o0), memcpy_retl_o2_plus_o5_plus_1)
bgu,pt %xcc, 7b
add %o0, 1, %o0 ! advance dst
add %o1, %o0, %o1 ! restore %o1
.Ldst_aligned_on_8:
andcc %o1, 7, %o5
brnz,pt %o5, .Lsrc_dst_unaligned_on_8
nop
.Lsrc_dst_aligned_on_8: ! check if we are copying MED_MAX or more bytes set MED_MAX, %o3
cmp %o2, %o3 ! limit to store buffer size
bgu,pn %xcc, .Llarge_align8_copy
nop
/* *Specialcaseforhandlingwhensrcanddestarebothlongwordaligned *andtotaldatatomoveislessthanMED_MAXbytes
*/
.Lmedlong:
subcc %o2, 63, %o2 ! adjust length to allow cc test
ble,pn %xcc, .Lmedl63 ! skip big loop if less than 64 bytes
nop
.Lmedl64:
EX_LD(LOAD(ldx, %o1, %o4), memcpy_retl_o2_plus_63) ! load
subcc %o2, 64, %o2 ! decrement length count
EX_ST(STORE(stx, %o4, %o0), memcpy_retl_o2_plus_63_64) ! and store
EX_LD(LOAD(ldx, %o1+8, %o3), memcpy_retl_o2_plus_63_56) ! a block of 64
EX_ST(STORE(stx, %o3, %o0+8), memcpy_retl_o2_plus_63_56)
EX_LD(LOAD(ldx, %o1+16, %o4), memcpy_retl_o2_plus_63_48)
EX_ST(STORE(stx, %o4, %o0+16), memcpy_retl_o2_plus_63_48)
EX_LD(LOAD(ldx, %o1+24, %o3), memcpy_retl_o2_plus_63_40)
EX_ST(STORE(stx, %o3, %o0+24), memcpy_retl_o2_plus_63_40)
EX_LD(LOAD(ldx, %o1+32, %o4), memcpy_retl_o2_plus_63_32)! load and store
EX_ST(STORE(stx, %o4, %o0+32), memcpy_retl_o2_plus_63_32)
EX_LD(LOAD(ldx, %o1+40, %o3), memcpy_retl_o2_plus_63_24)! a block of 64
add %o1, 64, %o1 ! increase src ptr by 64
EX_ST(STORE(stx, %o3, %o0+40), memcpy_retl_o2_plus_63_24)
EX_LD(LOAD(ldx, %o1-16, %o4), memcpy_retl_o2_plus_63_16)
add %o0, 64, %o0 ! increase dst ptr by 64
EX_ST(STORE(stx, %o4, %o0-16), memcpy_retl_o2_plus_63_16)
EX_LD(LOAD(ldx, %o1-8, %o3), memcpy_retl_o2_plus_63_8)
bgu,pt %xcc, .Lmedl64 ! repeat if at least 64 bytes left
EX_ST(STORE(stx, %o3, %o0-8), memcpy_retl_o2_plus_63_8)
.Lmedl63:
addcc %o2, 32, %o2 ! adjust remaining count
ble,pt %xcc, .Lmedl31 ! to skip if 31 or fewer bytes left
nop
EX_LD(LOAD(ldx, %o1, %o4), memcpy_retl_o2_plus_31) ! load sub %o2, 32, %o2 ! decrement length count
EX_ST(STORE(stx, %o4, %o0), memcpy_retl_o2_plus_31_32) ! and store
EX_LD(LOAD(ldx, %o1+8, %o3), memcpy_retl_o2_plus_31_24) ! a block of 32
add %o1, 32, %o1 ! increase src ptr by 32
EX_ST(STORE(stx, %o3, %o0+8), memcpy_retl_o2_plus_31_24)
EX_LD(LOAD(ldx, %o1-16, %o4), memcpy_retl_o2_plus_31_16)
add %o0, 32, %o0 ! increase dst ptr by 32
EX_ST(STORE(stx, %o4, %o0-16), memcpy_retl_o2_plus_31_16)
EX_LD(LOAD(ldx, %o1-8, %o3), memcpy_retl_o2_plus_31_8)
EX_ST(STORE(stx, %o3, %o0-8), memcpy_retl_o2_plus_31_8)
.Lmedl31:
addcc %o2, 16, %o2 ! adjust remaining count
ble,pt %xcc, .Lmedl15 ! skip if 15 or fewer bytes left
nop !
EX_LD(LOAD(ldx, %o1, %o4), memcpy_retl_o2_plus_15)
add %o1, 16, %o1 ! increase src ptr by 16
EX_ST(STORE(stx, %o4, %o0), memcpy_retl_o2_plus_15) sub %o2, 16, %o2 ! decrease count by 16
EX_LD(LOAD(ldx, %o1-8, %o3), memcpy_retl_o2_plus_15_8)
add %o0, 16, %o0 ! increase dst ptr by 16
EX_ST(STORE(stx, %o3, %o0-8), memcpy_retl_o2_plus_15_8)
.Lmedl15:
addcc %o2, 15, %o2 ! restore count
bz,pt %xcc, .Lsmallx ! exit if finished
cmp %o2, 8
blt,pt %xcc, .Lmedw7 ! skip if 7 or fewer bytes left
tst %o2
EX_LD(LOAD(ldx, %o1, %o4), memcpy_retl_o2) ! load 8 bytes
add %o1, 8, %o1 ! increase src ptr by 8
add %o0, 8, %o0 ! increase dst ptr by 8
subcc %o2, 8, %o2 ! decrease count by 8
bnz,pn %xcc, .Lmedw7
EX_ST(STORE(stx, %o4, %o0-8), memcpy_retl_o2_plus_8) ! and store 8
retl
mov EX_RETVAL(%g1), %o0 ! restore %o0
.align16
.Lsrc_dst_unaligned_on_8: ! DST is 8-byte aligned, src is not 2:
andcc %o1, 0x3, %o5 ! test word alignment
bnz,pt %xcc, .Lunalignsetup ! branch to skip if not word aligned
nop
/* *Handleallcaseswheresrcanddestarealignedonword *boundaries.Useunrolledloopsforbetterperformance. *Thisoptionwinsoverstandardlargedatamovewhen *sourceanddestinationisincachefor.Lmedium *toshortdatamoves.
*/ set MED_WMAX, %o3
cmp %o2, %o3 ! limit to store buffer size
bge,pt %xcc, .Lunalignrejoin ! otherwise rejoin main loop
nop
subcc %o2, 31, %o2 ! adjust length to allow cc test ! for end of loop
ble,pt %xcc, .Lmedw31 ! skip big loop if less than 16
.Lmedw32:
EX_LD(LOAD(ld, %o1, %o4), memcpy_retl_o2_plus_31)! move a block of 32 sllx %o4, 32, %o5
EX_LD(LOAD(ld, %o1+4, %o4), memcpy_retl_o2_plus_31)
or %o4, %o5, %o5
EX_ST(STORE(stx, %o5, %o0), memcpy_retl_o2_plus_31)
subcc %o2, 32, %o2 ! decrement length count
EX_LD(LOAD(ld, %o1+8, %o4), memcpy_retl_o2_plus_31_24) sllx %o4, 32, %o5
EX_LD(LOAD(ld, %o1+12, %o4), memcpy_retl_o2_plus_31_24)
or %o4, %o5, %o5
EX_ST(STORE(stx, %o5, %o0+8), memcpy_retl_o2_plus_31_24)
add %o1, 32, %o1 ! increase src ptr by 32
EX_LD(LOAD(ld, %o1-16, %o4), memcpy_retl_o2_plus_31_16) sllx %o4, 32, %o5
EX_LD(LOAD(ld, %o1-12, %o4), memcpy_retl_o2_plus_31_16)
or %o4, %o5, %o5
EX_ST(STORE(stx, %o5, %o0+16), memcpy_retl_o2_plus_31_16)
add %o0, 32, %o0 ! increase dst ptr by 32
EX_LD(LOAD(ld, %o1-8, %o4), memcpy_retl_o2_plus_31_8) sllx %o4, 32, %o5
EX_LD(LOAD(ld, %o1-4, %o4), memcpy_retl_o2_plus_31_8)
or %o4, %o5, %o5
bgu,pt %xcc, .Lmedw32 ! repeat if at least 32 bytes left
EX_ST(STORE(stx, %o5, %o0-8), memcpy_retl_o2_plus_31_8)
.Lmedw31:
addcc %o2, 31, %o2 ! restore count
bz,pt %xcc, .Lsmallx ! exit if finished
nop
cmp %o2, 16
blt,pt %xcc, .Lmedw15
nop
EX_LD(LOAD(ld, %o1, %o4), memcpy_retl_o2)! move a block of 16 bytes sllx %o4, 32, %o5
subcc %o2, 16, %o2 ! decrement length count
EX_LD(LOAD(ld, %o1+4, %o4), memcpy_retl_o2_plus_16)
or %o4, %o5, %o5
EX_ST(STORE(stx, %o5, %o0), memcpy_retl_o2_plus_16)
add %o1, 16, %o1 ! increase src ptr by 16
EX_LD(LOAD(ld, %o1-8, %o4), memcpy_retl_o2_plus_8)
add %o0, 16, %o0 ! increase dst ptr by 16 sllx %o4, 32, %o5
EX_LD(LOAD(ld, %o1-4, %o4), memcpy_retl_o2_plus_8)
or %o4, %o5, %o5
EX_ST(STORE(stx, %o5, %o0-8), memcpy_retl_o2_plus_8)
.Lmedw15:
bz,pt %xcc, .Lsmallx ! exit if finished
cmp %o2, 8
blt,pn %xcc, .Lmedw7 ! skip if 7 or fewer bytes left
tst %o2
EX_LD(LOAD(ld, %o1, %o4), memcpy_retl_o2) ! load 4 bytes
subcc %o2, 8, %o2 ! decrease count by 8
EX_ST(STORE(stw, %o4, %o0), memcpy_retl_o2_plus_8)! and store 4 bytes
add %o1, 8, %o1 ! increase src ptr by 8
EX_LD(LOAD(ld, %o1-4, %o3), memcpy_retl_o2_plus_4) ! load 4 bytes
add %o0, 8, %o0 ! increase dst ptr by 8
EX_ST(STORE(stw, %o3, %o0-4), memcpy_retl_o2_plus_4)! and store 4 bytes
bz,pt %xcc, .Lsmallx ! exit if finished
.Lmedw7: ! count is ge 1, less than 8
cmp %o2, 4! check for 4 bytes left
blt,pn %xcc, .Lsmallleft3 ! skip if 3 or fewer bytes left
nop !
EX_LD(LOAD(ld, %o1, %o4), memcpy_retl_o2) ! load 4 bytes
add %o1, 4, %o1 ! increase src ptr by 4
add %o0, 4, %o0 ! increase dst ptr by 4
subcc %o2, 4, %o2 ! decrease count by 4
bnz .Lsmallleft3
EX_ST(STORE(stw, %o4, %o0-4), memcpy_retl_o2_plus_4)! and store 4 bytes
retl
mov EX_RETVAL(%g1), %o0
.align16
.Llarge_align8_copy: ! Src and dst share 8 byte alignment ! align dst to 64 byte boundary
andcc %o0, 0x3f, %o3 ! %o3 == 0 means dst is 64 byte aligned
brz,pn %o3, .Laligned_to_64
andcc %o0, 8, %o3 ! odd long words to move?
brz,pt %o3, .Laligned_to_16
nop
EX_LD(LOAD(ldx, %o1, %o4), memcpy_retl_o2) sub %o2, 8, %o2
add %o1, 8, %o1 ! increment src ptr
add %o0, 8, %o0 ! increment dst ptr
EX_ST(STORE(stx, %o4, %o0-8), memcpy_retl_o2_plus_8)
.Laligned_to_16:
andcc %o0, 16, %o3 ! pair of long words to move?
brz,pt %o3, .Laligned_to_32
nop
EX_LD(LOAD(ldx, %o1, %o4), memcpy_retl_o2) sub %o2, 16, %o2
EX_ST(STORE(stx, %o4, %o0), memcpy_retl_o2_plus_16)
add %o1, 16, %o1 ! increment src ptr
EX_LD(LOAD(ldx, %o1-8, %o4), memcpy_retl_o2_plus_8)
add %o0, 16, %o0 ! increment dst ptr
EX_ST(STORE(stx, %o4, %o0-8), memcpy_retl_o2_plus_8)
.Laligned_to_32:
andcc %o0, 32, %o3 ! four long words to move?
brz,pt %o3, .Laligned_to_64
nop
EX_LD(LOAD(ldx, %o1, %o4), memcpy_retl_o2) sub %o2, 32, %o2
EX_ST(STORE(stx, %o4, %o0), memcpy_retl_o2_plus_32)
EX_LD(LOAD(ldx, %o1+8, %o4), memcpy_retl_o2_plus_24)
EX_ST(STORE(stx, %o4, %o0+8), memcpy_retl_o2_plus_24)
EX_LD(LOAD(ldx, %o1+16, %o4), memcpy_retl_o2_plus_16)
EX_ST(STORE(stx, %o4, %o0+16), memcpy_retl_o2_plus_16)
add %o1, 32, %o1 ! increment src ptr
EX_LD(LOAD(ldx, %o1-8, %o4), memcpy_retl_o2_plus_8)
add %o0, 32, %o0 ! increment dst ptr
EX_ST(STORE(stx, %o4, %o0-8), memcpy_retl_o2_plus_8)
.Laligned_to_64: ! ! Using block init store (BIS) instructions to avoid fetching cache ! lines from memory. Use ST_CHUNK stores to first element of each cache ! line (similar to prefetching) to avoid overfilling STQ or miss buffers. ! Gives existing cache lines time to be moved out of L1/L2/L3 cache. ! Initial stores using MRU version of BIS to keep cache line in ! cache until we are ready to store final element of cache line. ! Then store last element using the LRU version of BIS. !
andn %o2, 0x3f, %o5 ! %o5 is multiple of block size
and %o2, 0x3f, %o2 ! residue bytes in %o2 ! ! We use STORE_MRU_ASI for the first seven stores to each cache line ! followed by STORE_ASI (mark as LRU) for the last store. That ! mixed approach reduces the probability that the cache line is removed ! before we finish setting it, while minimizing the effects on ! other cached values during a large memcpy ! ! ST_CHUNK batches up initial BIS operations for several cache lines ! to allow multiple requests to not be blocked by overflowing the ! the store miss buffer. Then the matching stores for all those ! BIS operations are executed. !
.Lalign_done:
add %o0, 8, %o0 ! restore %o0 from ASI alignment
membar #StoreStore sub %o2, 63, %o2 ! adjust length to allow cc test
ba .Lmedl63 ! in .Lmedl63
nop
.align16 ! Dst is on 8 byte boundary; src is not; remaining count > SMALL_MAX
.Lunalignsetup:
.Lunalignrejoin:
mov %g1, %o3 ! save %g1 as VISEntryHalf clobbers it
#ifdef NON_USER_COPY
VISEntryHalfFast(.Lmedium_vis_entry_fail_cp)
#else
VISEntryHalf
#endif
mov %o3, %g1 ! restore %g1
! Destination is now block (64 byte aligned)
.Lunalignsrc:
andn %o2, 0x3f, %o5 ! %o5 is multiple of block size
and %o2, 0x3f, %o2 ! residue bytes in %o2
add %o2, 64, %o2 ! Insure we do not load beyond sub %o5, 64, %o5 ! end of source buffer
andn %o1, 0x7, %o4 ! %o4 has long word aligned src address
alignaddr %o1, %g0, %g0 ! generate %gsr
add %o1, %o5, %o1 ! advance %o1 to after blocks
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