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-/* 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)