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Diffstat (limited to 'ports/sysdeps/alpha/bzero.S')
| -rw-r--r-- | ports/sysdeps/alpha/bzero.S | 110 |
1 files changed, 0 insertions, 110 deletions
diff --git a/ports/sysdeps/alpha/bzero.S b/ports/sysdeps/alpha/bzero.S deleted file mode 100644 index 36e891ca85..0000000000 --- a/ports/sysdeps/alpha/bzero.S +++ /dev/null @@ -1,110 +0,0 @@ -/* Copyright (C) 1996-2014 Free Software Foundation, Inc. - Contributed by Richard Henderson (rth@tamu.edu) - This file is part of the GNU C Library. - - 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/>. */ - -/* Fill a block of memory with zeros. Optimized for the Alpha architecture: - - - memory accessed as aligned quadwords only - - destination memory not read unless needed for good cache behaviour - - basic blocks arranged to optimize branch prediction for full-quadword - aligned memory blocks. - - partial head and tail quadwords constructed with byte-mask instructions - - This is generally scheduled for the EV5 (got to look out for my own - interests :-), but with EV4 needs in mind. There *should* be no more - stalls for the EV4 than there are for the EV5. -*/ - - -#include <sysdep.h> - - .set noat - .set noreorder - - .text - .type __bzero, @function - .globl __bzero - .usepv __bzero, USEPV_PROF - - cfi_startproc - - /* On entry to this basic block: - t3 == loop counter - t4 == bytes in partial final word - a0 == possibly misaligned destination pointer */ - - .align 3 -bzero_loop: - beq t3, $tail # - blbc t3, 0f # skip single store if count even - - stq_u zero, 0(a0) # e0 : store one word - subq t3, 1, t3 # .. e1 : - addq a0, 8, a0 # e0 : - beq t3, $tail # .. e1 : - -0: stq_u zero, 0(a0) # e0 : store two words - subq t3, 2, t3 # .. e1 : - stq_u zero, 8(a0) # e0 : - addq a0, 16, a0 # .. e1 : - bne t3, 0b # e1 : - -$tail: bne t4, 1f # is there a tail to do? - ret # no - -1: ldq_u t0, 0(a0) # yes, load original data - mskqh t0, t4, t0 # - stq_u t0, 0(a0) # - ret # - -__bzero: -#ifdef PROF - ldgp gp, 0(pv) - lda AT, _mcount - jsr AT, (AT), _mcount -#endif - - mov a0, v0 # e0 : move return value in place - beq a1, $done # .. e1 : early exit for zero-length store - and a0, 7, t1 # e0 : - addq a1, t1, a1 # e1 : add dest misalignment to count - srl a1, 3, t3 # e0 : loop = count >> 3 - and a1, 7, t4 # .. e1 : find number of bytes in tail - unop # : - beq t1, bzero_loop # e1 : aligned head, jump right in - - ldq_u t0, 0(a0) # e0 : load original data to mask into - cmpult a1, 8, t2 # .. e1 : is this a sub-word set? - bne t2, $oneq # e1 : - - mskql t0, a0, t0 # e0 : we span words. finish this partial - subq t3, 1, t3 # e0 : - addq a0, 8, a0 # .. e1 : - stq_u t0, -8(a0) # e0 : - br bzero_loop # .. e1 : - - .align 3 -$oneq: - mskql t0, a0, t2 # e0 : - mskqh t0, a1, t3 # e0 : - or t2, t3, t0 # e1 : - stq_u t0, 0(a0) # e0 : - -$done: ret - - cfi_endproc -weak_alias (__bzero, bzero) |