diff options
Diffstat (limited to 'sysdeps/alpha/strrchr.S')
| -rw-r--r-- | sysdeps/alpha/strrchr.S | 111 |
1 files changed, 0 insertions, 111 deletions
diff --git a/sysdeps/alpha/strrchr.S b/sysdeps/alpha/strrchr.S deleted file mode 100644 index 248181f702..0000000000 --- a/sysdeps/alpha/strrchr.S +++ /dev/null @@ -1,111 +0,0 @@ -/* Copyright (C) 1996, 1997, 2003 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 the address of the last occurrence of a given character - within a null-terminated string, or null if it is not found. - - This is generally scheduled for the EV5 (got to look out for my own - interests :-), but with EV4 needs in mind. There are, in fact, fewer - stalls on the EV4 than there are on the EV5. -*/ - -#include <sysdep.h> - - .set noreorder - .set noat - -ENTRY(strrchr) -#ifdef PROF - ldgp gp, 0(pv) - lda AT, _mcount - jsr AT, (AT), _mcount - .prologue 1 -#else - .prologue 0 -#endif - - and a1, 0xff, a1 # e0 : zero extend our test character - mov zero, t6 # .. e1 : t6 is last match aligned addr - sll a1, 8, t5 # e0 : replicate our test character - mov zero, t7 # .. e1 : t7 is last match byte compare mask - or t5, a1, a1 # e0 : - ldq_u t0, 0(a0) # .. e1 : load first quadword - sll a1, 16, t5 # e0 : - andnot a0, 7, v0 # .. e1 : align source addr - or t5, a1, a1 # e0 : - lda t4, -1 # .. e1 : build garbage mask - sll a1, 32, t5 # e0 : - cmpbge zero, t0, t1 # .. e1 : bits set iff byte == zero - mskqh t4, a0, t4 # e0 : - or t5, a1, a1 # .. e1 : character replication complete - xor t0, a1, t2 # e0 : make bytes == c zero - cmpbge zero, t4, t4 # .. e1 : bits set iff byte is garbage - cmpbge zero, t2, t3 # e0 : bits set iff byte == c - andnot t1, t4, t1 # .. e1 : clear garbage from null test - andnot t3, t4, t3 # e0 : clear garbage from char test - bne t1, $eos # .. e1 : did we already hit the terminator? - - /* Character search main loop */ -$loop: - ldq t0, 8(v0) # e0 : load next quadword - cmovne t3, v0, t6 # .. e1 : save previous comparisons match - cmovne t3, t3, t7 # e0 : - addq v0, 8, v0 # .. e1 : - xor t0, a1, t2 # e0 : - cmpbge zero, t0, t1 # .. e1 : bits set iff byte == zero - cmpbge zero, t2, t3 # e0 : bits set iff byte == c - beq t1, $loop # .. e1 : if we havnt seen a null, loop - - /* Mask out character matches after terminator */ -$eos: - negq t1, t4 # e0 : isolate first null byte match - and t1, t4, t4 # e1 : - subq t4, 1, t5 # e0 : build a mask of the bytes upto... - or t4, t5, t4 # e1 : ... and including the null - - and t3, t4, t3 # e0 : mask out char matches after null - cmovne t3, t3, t7 # .. e1 : save it, if match found - cmovne t3, v0, t6 # e0 : - - /* Locate the address of the last matched character */ - - /* Retain the early exit for the ev4 -- the ev5 mispredict penalty - is 5 cycles -- the same as just falling through. */ - beq t7, $retnull # .. e1 : - - and t7, 0xf0, t2 # e0 : binary search for the high bit set - cmovne t2, t2, t7 # .. e1 (zdb) - cmovne t2, 4, t2 # e0 : - and t7, 0xcc, t1 # .. e1 : - cmovne t1, t1, t7 # e0 : - cmovne t1, 2, t1 # .. e1 : - and t7, 0xaa, t0 # e0 : - cmovne t0, 1, t0 # .. e1 (zdb) - addq t2, t1, t1 # e0 : - addq t6, t0, v0 # .. e1 : add our aligned base ptr to the mix - addq v0, t1, v0 # e0 : - ret # .. e1 : - -$retnull: - mov zero, v0 # e0 : - ret # .. e1 : - - END(strrchr) - -weak_alias (strrchr, rindex) -libc_hidden_builtin_def (strrchr) |