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-rw-r--r--sysdeps/alpha/alphaev67/rawmemchr.S93
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diff --git a/sysdeps/alpha/alphaev67/rawmemchr.S b/sysdeps/alpha/alphaev67/rawmemchr.S
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-/* Copyright (C) 2000, 2002 Free Software Foundation, Inc.
- 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. */
-
-/* Return pointer to first occurrence of CH in STR. */
-
-#include <sysdep.h>
-
- .arch ev6
- .set noreorder
- .set noat
-
-ENTRY(__rawmemchr)
-#ifdef PROF
- ldgp gp, 0(pv)
- lda AT, _mcount
- jsr AT, (AT), _mcount
- .prologue 1
-#else
- .prologue 0
-#endif
-
- ldq_u t0, 0(a0) # L : load first quadword Latency=3
- and a1, 0xff, t3 # E : 00000000000000ch
- insbl a1, 1, t5 # U : 000000000000ch00
- insbl a1, 7, a2 # U : ch00000000000000
-
- insbl t3, 6, a3 # U : 00ch000000000000
- or t5, t3, a1 # E : 000000000000chch
- andnot a0, 7, v0 # E : align our loop pointer
- lda t4, -1 # E : build garbage mask
-
- mskqh t4, a0, t4 # U : only want relevant part of first quad
- or a2, a3, a2 # E : chch000000000000
- inswl a1, 2, t5 # E : 00000000chch0000
- inswl a1, 4, a3 # E : 0000chch00000000
-
- or a1, a2, a1 # E : chch00000000chch
- or a3, t5, t5 # E : 0000chchchch0000
- cmpbge zero, t4, t4 # E : bits set iff byte is garbage
- nop # E :
-
- /* This quad is _very_ serialized. Lots of stalling happens */
- or t5, a1, a1 # E : chchchchchchchch
- xor t0, a1, t1 # E : make bytes == c zero
- cmpbge zero, t1, t0 # E : bits set iff byte == c
- andnot t0, t4, t0 # E : clear garbage bits
-
- cttz t0, a2 # U0 : speculative (in case we get a match)
- nop # E :
- nop # E :
- bne t0, $found # U :
-
- /*
- * Yuk. This loop is going to stall like crazy waiting for the
- * data to be loaded. Not much can be done about it unless it's
- * unrolled multiple times, which is generally unsafe.
- */
-$loop:
- ldq t0, 8(v0) # L : Latency=3
- addq v0, 8, v0 # E :
- xor t0, a1, t1 # E :
- cmpbge zero, t1, t0 # E : bits set iff byte == c
-
- cttz t0, a2 # U0 : speculative (in case we get a match)
- nop # E :
- nop # E :
- beq t0, $loop # U :
-
-$found:
- negq t0, t1 # E : clear all but least set bit
- and t0, t1, t0 # E :
- addq v0, a2, v0 # E : Add in the bit number from above
- ret # L0 :
-
- END(__rawmemchr)
-
-libc_hidden_def (__rawmemchr)
-weak_alias (__rawmemchr, rawmemchr)