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-rw-r--r--sysdeps/alpha/alphaev67/strlen.S61
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diff --git a/sysdeps/alpha/alphaev67/strlen.S b/sysdeps/alpha/alphaev67/strlen.S
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-/* Copyright (C) 2000, 2003 Free Software Foundation, Inc.
- Contributed by David Mosberger (davidm@cs.arizona.edu).
- EV67 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. */
-
-/* Finds length of a 0-terminated string. */
-
-#include <sysdep.h>
-
- .arch ev6
- .set noreorder
- .set noat
-
-ENTRY(strlen)
-#ifdef PROF
- ldgp gp, 0(pv)
- lda AT, _mcount
- jsr AT, (AT), _mcount
- .prologue 1
-#else
- .prologue 0
-#endif
-
- ldq_u $1, 0($16) # L : load first quadword ($16 may be misaligned)
- lda $2, -1($31) # E :
- insqh $2, $16, $2 # U :
- andnot $16, 7, $0 # E :
-
- or $2, $1, $1 # E :
- cmpbge $31, $1, $2 # E : $2 <- bitmask: bit i == 1 <==> i-th byte == 0
- nop # E :
- bne $2, $found # U :
-
-$loop: ldq $1, 8($0) # L :
- addq $0, 8, $0 # E : addr += 8
- cmpbge $31, $1, $2 # E :
- beq $2, $loop # U :
-
-$found:
- cttz $2, $3 # U0 :
- addq $0, $3, $0 # E :
- subq $0, $16, $0 # E :
- ret $31, ($26) # L0 :
-
- END(strlen)
-libc_hidden_builtin_def (strlen)