summaryrefslogtreecommitdiff
path: root/libc/string/sparc/sparc32/memchr.S
diff options
context:
space:
mode:
authorMike Frysinger <vapier@gentoo.org>2005-08-26 00:01:54 +0000
committerMike Frysinger <vapier@gentoo.org>2005-08-26 00:01:54 +0000
commitd71ff82e7019e91ae9f76af391e7f677d421e205 (patch)
treeb28b78dd5619b59cd28d11f007543e69fbe4bf12 /libc/string/sparc/sparc32/memchr.S
parentb11c2a4d0b7cf8095b93ae70fc187f0feadae5a1 (diff)
import sparc-optimized string functions from glibc
Diffstat (limited to 'libc/string/sparc/sparc32/memchr.S')
-rw-r--r--libc/string/sparc/sparc32/memchr.S144
1 files changed, 144 insertions, 0 deletions
diff --git a/libc/string/sparc/sparc32/memchr.S b/libc/string/sparc/sparc32/memchr.S
new file mode 100644
index 000000000..c00df2427
--- /dev/null
+++ b/libc/string/sparc/sparc32/memchr.S
@@ -0,0 +1,144 @@
+/* memchr (str, ch, n) -- Return pointer to first occurrence of CH in STR less
+ than N.
+ For SPARC v7.
+ Copyright (C) 1996, 1999, 2000, 2003 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Jakub Jelinek <jj@ultra.linux.cz> and
+ David S. Miller <davem@caip.rutgers.edu>.
+ This version is developed using the same algorithm as the fast C
+ version which carries the following introduction:
+ Based on strlen implementation by Torbjorn Granlund (tege@sics.se),
+ with help from Dan Sahlin (dan@sics.se) and
+ commentary by Jim Blandy (jimb@ai.mit.edu);
+ adaptation to memchr suggested by Dick Karpinski (dick@cca.ucsf.edu),
+ and implemented by Roland McGrath (roland@ai.mit.edu).
+
+ 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. */
+
+ .text
+ .align 4
+0: cmp %o2, 0
+ be 9f
+ sethi %hi(0x80808080), %o4
+ ldub [%o0], %g4
+ cmp %g4, %o1
+ be 1f
+ add %o0, 1, %o0
+ subcc %o2, 1, %o2
+ be 9f
+ andcc %o0, 3, %g0
+ be 4f
+ or %o4, %lo(0x80808080), %o3
+ ldub [%o0], %g4
+ cmp %g4, %o1
+ be 1f
+ add %o0, 1, %o0
+ subcc %o2, 1, %o2
+ be 9f
+ andcc %o0, 3, %g0
+ be 5f
+ sethi %hi(0x01010101), %o5
+ ldub [%o0], %g4
+ cmp %g4, %o1
+ be 1f
+ add %o0, 1, %o0
+ subcc %o2, 1, %o2
+ bne,a 7f
+ and %o2, 3, %g1
+ retl
+ clr %o0
+1: retl
+ sub %o0, 1, %o0
+
+ENTRY(__memchr)
+ andcc %o1, 0xff, %o1
+ sll %o1, 8, %g6
+ andcc %o0, 3, %g0
+ or %o1, %g6, %g6
+ sll %g6, 16, %o3
+ bne 0b
+ or %o3, %g6, %g2
+ sethi %hi(0x80808080), %o4
+ or %o4, %lo(0x80808080), %o3
+4: sethi %hi(0x01010101), %o5
+5: and %o2, 3, %g1
+7: andcc %o2, 0xfffffffc, %o2
+ be 0f
+ or %o5, %lo(0x01010101), %g6
+ ld [%o0], %g4
+6: xor %g4, %g2, %g5
+ add %o0, 4, %o0
+ sub %g5, %g6, %g5
+ andcc %g5, %o3, %g0
+ bne 8f
+ subcc %o2, 4, %o2
+ bne,a 6b
+ ld [%o0], %g4
+0: cmp %g1, 0
+1: be 9f
+ add %o0, 4, %o0
+ ldub [%o0 - 4], %g4
+ cmp %g4, %o1
+ be 4f
+ cmp %g1, 1
+ be 9f
+ ldub [%o0 - 3], %g4
+ cmp %g4, %o1
+ be 3f
+ cmp %g1, 2
+ be 9f
+ ldub [%o0 - 2], %g4
+ cmp %g4, %o1
+ be 2f
+ nop
+9: retl
+ clr %o0
+
+ /* Check every byte. */
+8: srl %g4, 24, %g5
+ and %g5, 0xff, %g5
+ cmp %g5, %o1
+ be 4f
+ srl %g4, 16, %g5
+ and %g5, 0xff, %g5
+ cmp %g5, %o1
+ be 3f
+ srl %g4, 8, %g5
+ and %g5, 0xff, %g5
+ cmp %g5, %o1
+ be 2f
+ and %g4, 0xff, %g5
+ cmp %g5, %o1
+ be 1f
+ cmp %o2, 0
+ bne,a 6b
+ ld [%o0], %g4
+ b 1b
+ cmp %g1, 0
+1: retl
+ sub %o0, 1, %o0
+2: retl
+ sub %o0, 2, %o0
+3: retl
+ sub %o0, 3, %o0
+4: retl
+ sub %o0, 4, %o0
+END(__memchr)
+
+weak_alias (__memchr, memchr)
+#if !__BOUNDED_POINTERS__
+weak_alias (__memchr, __ubp_memchr)
+#endif