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Diffstat (limited to 'sysdeps/alpha/alphaev6/memcpy.S')
| -rw-r--r-- | sysdeps/alpha/alphaev6/memcpy.S | 255 |
1 files changed, 0 insertions, 255 deletions
diff --git a/sysdeps/alpha/alphaev6/memcpy.S b/sysdeps/alpha/alphaev6/memcpy.S deleted file mode 100644 index 170a23b5da..0000000000 --- a/sysdeps/alpha/alphaev6/memcpy.S +++ /dev/null @@ -1,255 +0,0 @@ -/* Copyright (C) 2000-2017 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, see - <http://www.gnu.org/licenses/>. */ - -/* - * 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) |