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authorRoland McGrath <roland@gnu.org>2008-11-26 07:26:32 +0000
committerRoland McGrath <roland@gnu.org>2008-11-26 07:26:32 +0000
commitc0439b95b88bccacb5562e372f881beb23376a72 (patch)
treeaea008f060bef693d43f285f5adb5ece05cb7db6 /sysdeps/alpha/alphaev6/memcpy.S
parentf1092afe15ad779d61a1420c05854a9122d3ce5e (diff)
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Moved alpha to ports repository.
2008-11-25 Roland McGrath <roland@redhat.com> * sysdeps/alpha, sysdeps/unix/bsd/osf/alpha, sysdeps/unix/bsd/Attic/osf1/alpha, sysdeps/unix/sysv/linux/alpha, sysdeps/unix/sysv/linux/alpha/alpha, sysdeps/unix/alpha, sysdeps/mach/alpha, sysdeps/mach/hurd/alpha: Subdirectories moved to ports repository. * configure.in (base_machine): Remove alpha case.
Diffstat (limited to 'sysdeps/alpha/alphaev6/memcpy.S')
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diff --git a/sysdeps/alpha/alphaev6/memcpy.S b/sysdeps/alpha/alphaev6/memcpy.S
deleted file mode 100644
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--- a/sysdeps/alpha/alphaev6/memcpy.S
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@@ -1,256 +0,0 @@
-/* Copyright (C) 2000, 2003 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- EV6 optimized by Rick Gorton <rick.gorton@alpha-processor.com>.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
-
-/*
- * Much of the information about 21264 scheduling/coding comes from:
- * Compiler Writer's Guide for the Alpha 21264
- * abbreviated as 'CWG' in other comments here
- * ftp.digital.com/pub/Digital/info/semiconductor/literature/dsc-library.html
- * Scheduling notation:
- * E - either cluster
- * U - upper subcluster; U0 - subcluster U0; U1 - subcluster U1
- * L - lower subcluster; L0 - subcluster L0; L1 - subcluster L1
- *
- * Temp usage notes:
- * $0 - destination address
- * $1,$2, - scratch
- */
-
-#include <sysdep.h>
-
- .arch ev6
- .set noreorder
- .set noat
-
-ENTRY(memcpy)
- .prologue 0
-
- mov $16, $0 # E : copy dest to return
- ble $18, $nomoredata # U : done with the copy?
- xor $16, $17, $1 # E : are source and dest alignments the same?
- and $1, 7, $1 # E : are they the same mod 8?
-
- bne $1, $misaligned # U : Nope - gotta do this the slow way
- /* source and dest are same mod 8 address */
- and $16, 7, $1 # E : Are both 0mod8?
- beq $1, $both_0mod8 # U : Yes
- nop # E :
-
- /*
- * source and dest are same misalignment. move a byte at a time
- * until a 0mod8 alignment for both is reached.
- * At least one byte more to move
- */
-
-$head_align:
- ldbu $1, 0($17) # L : grab a byte
- subq $18, 1, $18 # E : count--
- addq $17, 1, $17 # E : src++
- stb $1, 0($16) # L :
- addq $16, 1, $16 # E : dest++
- and $16, 7, $1 # E : Are we at 0mod8 yet?
- ble $18, $nomoredata # U : done with the copy?
- bne $1, $head_align # U :
-
-$both_0mod8:
- cmple $18, 127, $1 # E : Can we unroll the loop?
- bne $1, $no_unroll # U :
- and $16, 63, $1 # E : get mod64 alignment
- beq $1, $do_unroll # U : no single quads to fiddle
-
-$single_head_quad:
- ldq $1, 0($17) # L : get 8 bytes
- subq $18, 8, $18 # E : count -= 8
- addq $17, 8, $17 # E : src += 8
- nop # E :
-
- stq $1, 0($16) # L : store
- addq $16, 8, $16 # E : dest += 8
- and $16, 63, $1 # E : get mod64 alignment
- bne $1, $single_head_quad # U : still not fully aligned
-
-$do_unroll:
- addq $16, 64, $7 # E : Initial (+1 trip) wh64 address
- cmple $18, 127, $1 # E : Can we go through the unrolled loop?
- bne $1, $tail_quads # U : Nope
- nop # E :
-
-$unroll_body:
- wh64 ($7) # L1 : memory subsystem hint: 64 bytes at
- # ($7) are about to be over-written
- ldq $6, 0($17) # L0 : bytes 0..7
- nop # E :
- nop # E :
-
- ldq $4, 8($17) # L : bytes 8..15
- ldq $5, 16($17) # L : bytes 16..23
- addq $7, 64, $7 # E : Update next wh64 address
- nop # E :
-
- ldq $3, 24($17) # L : bytes 24..31
- addq $16, 64, $1 # E : fallback value for wh64
- nop # E :
- nop # E :
-
- addq $17, 32, $17 # E : src += 32 bytes
- stq $6, 0($16) # L : bytes 0..7
- nop # E :
- nop # E :
-
- stq $4, 8($16) # L : bytes 8..15
- stq $5, 16($16) # L : bytes 16..23
- subq $18, 192, $2 # E : At least two more trips to go?
- nop # E :
-
- stq $3, 24($16) # L : bytes 24..31
- addq $16, 32, $16 # E : dest += 32 bytes
- nop # E :
- nop # E :
-
- ldq $6, 0($17) # L : bytes 0..7
- ldq $4, 8($17) # L : bytes 8..15
- cmovlt $2, $1, $7 # E : Latency 2, extra map slot - Use
- # fallback wh64 address if < 2 more trips
- nop # E :
-
- ldq $5, 16($17) # L : bytes 16..23
- ldq $3, 24($17) # L : bytes 24..31
- addq $16, 32, $16 # E : dest += 32
- subq $18, 64, $18 # E : count -= 64
-
- addq $17, 32, $17 # E : src += 32
- stq $6, -32($16) # L : bytes 0..7
- stq $4, -24($16) # L : bytes 8..15
- cmple $18, 63, $1 # E : At least one more trip?
-
- stq $5, -16($16) # L : bytes 16..23
- stq $3, -8($16) # L : bytes 24..31
- nop # E :
- beq $1, $unroll_body
-
-$tail_quads:
-$no_unroll:
- .align 4
- subq $18, 8, $18 # E : At least a quad left?
- blt $18, $less_than_8 # U : Nope
- nop # E :
- nop # E :
-
-$move_a_quad:
- ldq $1, 0($17) # L : fetch 8
- subq $18, 8, $18 # E : count -= 8
- addq $17, 8, $17 # E : src += 8
- nop # E :
-
- stq $1, 0($16) # L : store 8
- addq $16, 8, $16 # E : dest += 8
- bge $18, $move_a_quad # U :
- nop # E :
-
-$less_than_8:
- .align 4
- addq $18, 8, $18 # E : add back for trailing bytes
- ble $18, $nomoredata # U : All-done
- nop # E :
- nop # E :
-
- /* Trailing bytes */
-$tail_bytes:
- subq $18, 1, $18 # E : count--
- ldbu $1, 0($17) # L : fetch a byte
- addq $17, 1, $17 # E : src++
- nop # E :
-
- stb $1, 0($16) # L : store a byte
- addq $16, 1, $16 # E : dest++
- bgt $18, $tail_bytes # U : more to be done?
- nop # E :
-
- /* branching to exit takes 3 extra cycles, so replicate exit here */
- ret $31, ($26), 1 # L0 :
- nop # E :
- nop # E :
- nop # E :
-
-$misaligned:
- mov $0, $4 # E : dest temp
- and $0, 7, $1 # E : dest alignment mod8
- beq $1, $dest_0mod8 # U : life doesnt totally suck
- nop
-
-$aligndest:
- ble $18, $nomoredata # U :
- ldbu $1, 0($17) # L : fetch a byte
- subq $18, 1, $18 # E : count--
- addq $17, 1, $17 # E : src++
-
- stb $1, 0($4) # L : store it
- addq $4, 1, $4 # E : dest++
- and $4, 7, $1 # E : dest 0mod8 yet?
- bne $1, $aligndest # U : go until we are aligned.
-
- /* Source has unknown alignment, but dest is known to be 0mod8 */
-$dest_0mod8:
- subq $18, 8, $18 # E : At least a quad left?
- blt $18, $misalign_tail # U : Nope
- ldq_u $3, 0($17) # L : seed (rotating load) of 8 bytes
- nop # E :
-
-$mis_quad:
- ldq_u $16, 8($17) # L : Fetch next 8
- extql $3, $17, $3 # U : masking
- extqh $16, $17, $1 # U : masking
- bis $3, $1, $1 # E : merged bytes to store
-
- subq $18, 8, $18 # E : count -= 8
- addq $17, 8, $17 # E : src += 8
- stq $1, 0($4) # L : store 8 (aligned)
- mov $16, $3 # E : "rotate" source data
-
- addq $4, 8, $4 # E : dest += 8
- bge $18, $mis_quad # U : More quads to move
- nop
- nop
-
-$misalign_tail:
- addq $18, 8, $18 # E : account for tail stuff
- ble $18, $nomoredata # U :
- nop
- nop
-
-$misalign_byte:
- ldbu $1, 0($17) # L : fetch 1
- subq $18, 1, $18 # E : count--
- addq $17, 1, $17 # E : src++
- nop # E :
-
- stb $1, 0($4) # L : store
- addq $4, 1, $4 # E : dest++
- bgt $18, $misalign_byte # U : more to go?
- nop
-
-
-$nomoredata:
- ret $31, ($26), 1 # L0 :
- nop # E :
- nop # E :
- nop # E :
-
-END(memcpy)
-libc_hidden_builtin_def (memcpy)