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Diffstat (limited to 'sysdeps/alpha/alphaev6/memset.S')
| -rw-r--r-- | sysdeps/alpha/alphaev6/memset.S | 224 |
1 files changed, 0 insertions, 224 deletions
diff --git a/sysdeps/alpha/alphaev6/memset.S b/sysdeps/alpha/alphaev6/memset.S deleted file mode 100644 index 3b3c4ba061..0000000000 --- a/sysdeps/alpha/alphaev6/memset.S +++ /dev/null @@ -1,224 +0,0 @@ -/* Copyright (C) 2000, 2003 Free Software Foundation, Inc. - Contributed by Richard Henderson (rth@tamu.edu) - EV6 optimized by Rick Gorton <rick.gorton@alpha-processor.com>. - 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. */ - -#include <sysdep.h> - - .arch ev6 - .set noat - .set noreorder - -ENTRY(memset) -#ifdef PROF - ldgp gp, 0(pv) - lda AT, _mcount - jsr AT, (AT), _mcount - .prologue 1 -#else - .prologue 0 -#endif - - /* - * Serious stalling happens. The only way to mitigate this is to - * undertake a major re-write to interleave the constant materialization - * with other parts of the fall-through code. This is important, even - * though it makes maintenance tougher. - * Do this later. - */ - and $17, 255, $1 # E : 00000000000000ch - insbl $17, 1, $2 # U : 000000000000ch00 - mov $16, $0 # E : return value - ble $18, $end # U : zero length requested? - - addq $18, $16, $6 # E : max address to write to - or $1, $2, $17 # E : 000000000000chch - insbl $1, 2, $3 # U : 0000000000ch0000 - insbl $1, 3, $4 # U : 00000000ch000000 - - or $3, $4, $3 # E : 00000000chch0000 - inswl $17, 4, $5 # U : 0000chch00000000 - xor $16, $6, $1 # E : will complete write be within one quadword? - inswl $17, 6, $2 # U : chch000000000000 - - or $17, $3, $17 # E : 00000000chchchch - or $2, $5, $2 # E : chchchch00000000 - bic $1, 7, $1 # E : fit within a single quadword? - and $16, 7, $3 # E : Target addr misalignment - - or $17, $2, $17 # E : chchchchchchchch - beq $1, $within_quad # U : - nop # E : - beq $3, $aligned # U : target is 0mod8 - - /* - * Target address is misaligned, and won't fit within a quadword. - */ - ldq_u $4, 0($16) # L : Fetch first partial - mov $16, $5 # E : Save the address - insql $17, $16, $2 # U : Insert new bytes - subq $3, 8, $3 # E : Invert (for addressing uses) - - addq $18, $3, $18 # E : $18 is new count ($3 is negative) - mskql $4, $16, $4 # U : clear relevant parts of the quad - subq $16, $3, $16 # E : $16 is new aligned destination - or $2, $4, $1 # E : Final bytes - - nop - stq_u $1,0($5) # L : Store result - nop - nop - - .align 4 -$aligned: - /* - * We are now guaranteed to be quad aligned, with at least - * one partial quad to write. - */ - - sra $18, 3, $3 # U : Number of remaining quads to write - and $18, 7, $18 # E : Number of trailing bytes to write - mov $16, $5 # E : Save dest address - beq $3, $no_quad # U : tail stuff only - - /* - * It's worth the effort to unroll this and use wh64 if possible. - * At this point, entry values are: - * $16 Current destination address - * $5 A copy of $16 - * $6 The max quadword address to write to - * $18 Number trailer bytes - * $3 Number quads to write - */ - - and $16, 0x3f, $2 # E : Forward work (only useful for unrolled loop) - subq $3, 16, $4 # E : Only try to unroll if > 128 bytes - subq $2, 0x40, $1 # E : bias counter (aligning stuff 0mod64) - blt $4, $loop # U : - - /* - * We know we've got at least 16 quads, minimum of one trip - * through unrolled loop. Do a quad at a time to get us 0mod64 - * aligned. - */ - - nop # E : - nop # E : - nop # E : - beq $1, $bigalign # U : - -$alignmod64: - stq $17, 0($5) # L : - subq $3, 1, $3 # E : For consistency later - addq $1, 8, $1 # E : Increment towards zero for alignment - addq $5, 8, $4 # E : Initial wh64 address (filler instruction) - - nop - nop - addq $5, 8, $5 # E : Inc address - blt $1, $alignmod64 # U : - -$bigalign: - /* - * $3 - number quads left to go - * $5 - target address (aligned 0mod64) - * $17 - mask of stuff to store - * Scratch registers available: $7, $2, $4, $1 - * We know that we'll be taking a minimum of one trip through. - * CWG Section 3.7.6: do not expect a sustained store rate of > 1/cycle - * Assumes the wh64 needs to be for 2 trips through the loop in the future. - * The wh64 is issued on for the starting destination address for trip +2 - * through the loop, and if there are less than two trips left, the target - * address will be for the current trip. - */ - -$do_wh64: - wh64 ($4) # L1 : memory subsystem write hint - subq $3, 24, $2 # E : For determining future wh64 addresses - stq $17, 0($5) # L : - nop # E : - - addq $5, 128, $4 # E : speculative target of next wh64 - stq $17, 8($5) # L : - stq $17, 16($5) # L : - addq $5, 64, $7 # E : Fallback address for wh64 (== next trip addr) - - stq $17, 24($5) # L : - stq $17, 32($5) # L : - cmovlt $2, $7, $4 # E : Latency 2, extra mapping cycle - nop - - stq $17, 40($5) # L : - stq $17, 48($5) # L : - subq $3, 16, $2 # E : Repeat the loop at least once more? - nop - - stq $17, 56($5) # L : - addq $5, 64, $5 # E : - subq $3, 8, $3 # E : - bge $2, $do_wh64 # U : - - nop - nop - nop - beq $3, $no_quad # U : Might have finished already - - .align 4 - /* - * Simple loop for trailing quadwords, or for small amounts - * of data (where we can't use an unrolled loop and wh64) - */ -$loop: - stq $17, 0($5) # L : - subq $3, 1, $3 # E : Decrement number quads left - addq $5, 8, $5 # E : Inc address - bne $3, $loop # U : more? - -$no_quad: - /* - * Write 0..7 trailing bytes. - */ - nop # E : - beq $18, $end # U : All done? - ldq $7, 0($5) # L : - mskqh $7, $6, $2 # U : Mask final quad - - insqh $17, $6, $4 # U : New bits - or $2, $4, $1 # E : Put it all together - stq $1, 0($5) # L : And back to memory - ret $31,($26),1 # L0 : - -$within_quad: - ldq_u $1, 0($16) # L : - insql $17, $16, $2 # U : New bits - mskql $1, $16, $4 # U : Clear old - or $2, $4, $2 # E : New result - - mskql $2, $6, $4 # U : - mskqh $1, $6, $2 # U : - or $2, $4, $1 # E : - stq_u $1, 0($16) # L : - -$end: - nop - nop - nop - ret $31,($26),1 # L0 : - - END(memset) -libc_hidden_builtin_def (memset) |