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-rw-r--r--sysdeps/alpha/strrchr.S111
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diff --git a/sysdeps/alpha/strrchr.S b/sysdeps/alpha/strrchr.S
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-/* 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)