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Diffstat (limited to 'sysdeps/alpha/memset.S')
| -rw-r--r-- | sysdeps/alpha/memset.S | 137 |
1 files changed, 0 insertions, 137 deletions
diff --git a/sysdeps/alpha/memset.S b/sysdeps/alpha/memset.S deleted file mode 100644 index e34af2b314..0000000000 --- a/sysdeps/alpha/memset.S +++ /dev/null @@ -1,137 +0,0 @@ -/* Copyright (C) 1996, 1997, 2003 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, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -/* Fill a block of memory with a character. 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 - -/* There is a problem with either gdb (as of 4.16) or gas (as of 2.7) that - doesn't like putting the entry point for a procedure somewhere in the - middle of the procedure descriptor. Work around this by putting the main - loop in its own procedure descriptor. */ - - /* On entry to this basic block: - t3 == loop counter - t4 == bytes in partial final word - a0 == possibly misaligned destination pointer - a1 == replicated source character */ - - .ent memset_loop - .align 3 -memset_loop: - .frame sp, 0, ra, 0 - .prologue 0 - - beq t3, $tail - blbc t3, 0f # skip single store if count even - - stq_u a1, 0(a0) # e0 : store one word - subq t3, 1, t3 # .. e1 : - addq a0, 8, a0 # e0 : - beq t3, $tail # .. e1 : - -0: stq_u a1, 0(a0) # e0 : store two words - subq t3, 2, t3 # .. e1 : - stq_u a1, 8(a0) # e0 : - addq a0, 16, a0 # .. e1 : - bne t3, 0b # e1 : - -$tail: bne t4, 1f # is there a tail to do? - ret # no - - .align 3 -1: ldq_u t0, 0(a0) # e1 : yes, load original data - mskql a1, t4, t1 # .. e0 : - mskqh t0, t4, t0 # e0 : - or t0, t1, t0 # e1 (stall) - stq_u t0, 0(a0) # e0 : - ret # .. e1 : - - .end memset_loop - -ENTRY(memset) -#ifdef PROF - ldgp gp, 0(pv) - lda AT, _mcount - jsr AT, (AT), _mcount - .prologue 1 -#else - .prologue 0 -#endif - - zapnot a1, 1, a1 # e0 : zero extend input character - mov a0, v0 # .. e1 : move return value in place - sll a1, 8, t0 # e0 : begin replicating the char - beq a2, $done # .. e1 : early exit for zero-length store - or t0, a1, a1 # e0 : - and a0, 7, t1 # .. e1 : dest misalignment - sll a1, 16, t0 # e0 : - addq a2, t1, a2 # .. e1 : add dest misalignment to count - or t0, a1, a1 # e0 : - srl a2, 3, t3 # .. e1 : loop = count >> 3 - sll a1, 32, t0 # e0 : - and a2, 7, t4 # .. e1 : find number of bytes in tail - or t0, a1, a1 # e0 : character replication done - - beq t1, memset_loop # .. e1 : aligned head, jump right in - - ldq_u t0, 0(a0) # e1 : load original data to mask into - mskqh a1, a0, t1 # .. e0 : - - cmpult a2, 8, t2 # e0 : is this a sub-word set? - bne t2, $oneq # .. e1 (zdb) - - mskql t0, a0, t0 # e0 : we span words. finish this partial - subq t3, 1, t3 # .. e1 : - addq a0, 8, a0 # e0 : - or t0, t1, t0 # .. e1 : - stq_u t0, -8(a0) # e0 : - br memset_loop # .. e1 : - - .align 3 -$oneq: - mskql t1, a2, t1 # e0 : entire operation within one word - mskql t0, a0, t2 # e0 : - mskqh t0, a2, t3 # e0 : - or t1, t2, t0 # .. e1 : - or t0, t3, t0 # e1 : - stq_u t0, 0(a0) # e0 (stall) - -$done: ret - - END(memset) -libc_hidden_builtin_def (memset) |