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Diffstat (limited to 'sysdeps/alpha/alphaev67/strchr.S')
| -rw-r--r-- | sysdeps/alpha/alphaev67/strchr.S | 101 |
1 files changed, 0 insertions, 101 deletions
diff --git a/sysdeps/alpha/alphaev67/strchr.S b/sysdeps/alpha/alphaev67/strchr.S deleted file mode 100644 index 101c7d489a..0000000000 --- a/sysdeps/alpha/alphaev67/strchr.S +++ /dev/null @@ -1,101 +0,0 @@ -/* Copyright (C) 2000, 2003 Free Software Foundation, Inc. - Contributed by Richard Henderson <rth@tamu.edu>, 1996. - 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. */ - -/* Return the address of a given character within a null-terminated - string, or null if it is not found. */ - -#include <sysdep.h> - - .arch ev6 - .set noreorder - .set noat - -ENTRY(strchr) -#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, t0, t2 # E : bits set iff byte == zero - cmpbge zero, t4, t4 # E : bits set iff byte is garbage - - /* 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, t3 # E : bits set iff byte == c - or t2, t3, t0 # E : bits set iff char match or zero match - - andnot t0, t4, t0 # E : clear garbage bits - cttz t0, a2 # U0 : speculative (in case we get a match) - 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, t0, t2 # E : bits set iff byte == 0 - - cmpbge zero, t1, t3 # E : bits set iff byte == c - or t2, t3, t0 # E : - cttz t3, a2 # U0 : speculative (in case we get a match) - beq t0, $loop # U : - -$found: - negq t0, t1 # E : clear all but least set bit - and t0, t1, t0 # E : - and t0, t3, t1 # E : bit set iff byte was the char - addq v0, a2, v0 # E : Add in the bit number from above - - cmoveq t1, $31, v0 # E : Two mapping slots, latency = 2 - nop - nop - ret # L0 : - - END(strchr) - -weak_alias (strchr, index) -libc_hidden_builtin_def (strchr) |