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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/sparc64/strcmp.S
parentb11c2a4d0b7cf8095b93ae70fc187f0feadae5a1 (diff)
import sparc-optimized string functions from glibc
Diffstat (limited to 'libc/string/sparc/sparc64/strcmp.S')
-rw-r--r--libc/string/sparc/sparc64/strcmp.S278
1 files changed, 278 insertions, 0 deletions
diff --git a/libc/string/sparc/sparc64/strcmp.S b/libc/string/sparc/sparc64/strcmp.S
new file mode 100644
index 000000000..5866778d3
--- /dev/null
+++ b/libc/string/sparc/sparc64/strcmp.S
@@ -0,0 +1,278 @@
+/* Compare two strings for differences.
+ For SPARC v9.
+ Copyright (C) 1997, 1999, 2003 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Jan Vondrak <jvon4518@ss1000.ms.mff.cuni.cz> and
+ Jakub Jelinek <jj@ultra.linux.cz>.
+
+ 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. */
+
+#include <asm/asi.h>
+#ifndef XCC
+ .register %g2, #scratch
+ .register %g3, #scratch
+ .register %g6, #scratch
+#endif
+
+ /* Normally, this uses
+ ((xword - 0x0101010101010101) & 0x8080808080808080) test
+ to find out if any byte in xword could be zero. This is fast, but
+ also gives false alarm for any byte in range 0x81-0xff. It does
+ not matter for correctness, as if this test tells us there could
+ be some zero byte, we check it byte by byte, but if bytes with
+ high bits set are common in the strings, then this will give poor
+ performance. You can #define EIGHTBIT_NOT_RARE and the algorithm
+ will use one tick slower, but more precise test
+ ((xword - 0x0101010101010101) & (~xword) & 0x8080808080808080),
+ which does not give any false alarms (but if some bits are set,
+ one cannot assume from it which bytes are zero and which are not).
+ It is yet to be measured, what is the correct default for glibc
+ in these days for an average user.
+ */
+
+ .text
+ .align 32
+ENTRY(strcmp)
+ sethi %hi(0x01010101), %g1 /* IEU0 Group */
+ andcc %o0, 7, %g0 /* IEU1 */
+ bne,pn %icc, 7f /* CTI */
+ or %g1, %lo(0x01010101), %g1 /* IEU0 Group */
+
+ andcc %o1, 7, %g3 /* IEU1 */
+ bne,pn %icc, 9f /* CTI */
+ sllx %g1, 32, %g2 /* IEU0 Group */
+ ldx [%o0], %o2 /* Load */
+
+ or %g1, %g2, %g1 /* IEU0 Group */
+1: ldx [%o1], %o3 /* Load */
+ sub %o1, %o0, %o1 /* IEU1 */
+ sllx %g1, 7, %g2 /* IEU0 Group */
+
+2: add %o0, 8, %o0 /* IEU1 */
+ sub %o2, %g1, %g3 /* IEU0 Group */
+ subcc %o2, %o3, %g0 /* IEU1 */
+ bne,pn %xcc, 13f /* CTI */
+
+#ifdef EIGHTBIT_NOT_RARE
+ andn %g3, %o2, %g4 /* IEU0 Group */
+ ldxa [%o0] ASI_PNF, %o2 /* Load */
+ andcc %g4, %g2, %g0 /* IEU1 Group */
+#else
+ ldxa [%o0] ASI_PNF, %o2 /* Load Group */
+ andcc %g3, %g2, %g0 /* IEU1 */
+#endif
+ be,a,pt %xcc, 2b /* CTI */
+ ldxa [%o1 + %o0] ASI_PNF, %o3 /* Load Group */
+
+ addcc %g3, %g1, %o4 /* IEU1 */
+ srlx %g3, 32, %g3 /* IEU0 */
+ andcc %g3, %g2, %g0 /* IEU1 Group */
+ be,pt %xcc, 3f /* CTI */
+
+ srlx %o4, 56, %o5 /* IEU0 */
+ andcc %o5, 0xff, %g0 /* IEU1 Group */
+ be,pn %icc, 4f /* CTI */
+ srlx %o4, 48, %o5 /* IEU0 */
+
+ andcc %o5, 0xff, %g0 /* IEU1 Group */
+ be,pn %icc, 4f /* CTI */
+ srlx %o4, 40, %o5 /* IEU0 */
+ andcc %o5, 0xff, %g0 /* IEU1 Group */
+
+ be,pn %icc, 4f /* CTI */
+ srlx %o4, 32, %o5 /* IEU0 */
+ andcc %o5, 0xff, %g0 /* IEU1 Group */
+ be,pn %icc, 4f /* CTI */
+
+3: srlx %o4, 24, %o5 /* IEU0 */
+ andcc %o5, 0xff, %g0 /* IEU1 Group */
+ be,pn %icc, 4f /* CTI */
+ srlx %o4, 16, %o5 /* IEU0 */
+
+ andcc %o5, 0xff, %g0 /* IEU1 Group */
+ be,pn %icc, 4f /* CTI */
+ srlx %o4, 8, %o5 /* IEU0 */
+ andcc %o5, 0xff, %g0 /* IEU1 Group */
+
+ be,pn %icc, 4f /* CTI */
+ andcc %o4, 0xff, %g0 /* IEU1 Group */
+ bne,a,pn %icc, 2b /* CTI */
+ ldxa [%o1 + %o0] ASI_PNF, %o3 /* Load */
+
+4: retl /* CTI+IEU1 Group */
+ clr %o0 /* IEU0 */
+
+ .align 32
+13: mov 0xff, %g6 /* IEU0 Group */
+#ifdef EIGHTBIT_NOT_RARE
+ andcc %g4, %g2, %g0 /* IEU1 */
+#else
+ andcc %g3, %g2, %g0 /* IEU1 */
+#endif
+ be,pt %xcc, 25f /* CTI */
+ addcc %g3, %g1, %o4 /* IEU1 Group */
+
+ srlx %g3, 32, %g3 /* IEU0 */
+ andcc %g3, %g2, %g0 /* IEU1 Group */
+ be,pt %xcc, 23f /* CTI */
+ sllx %g6, 56, %o5 /* IEU0 */
+
+ andcc %o4, %o5, %g0 /* IEU1 Group */
+ be,pn %xcc, 24f /* CTI */
+ sllx %g6, 48, %o5 /* IEU0 */
+ andcc %o4, %o5, %g0 /* IEU1 Group */
+
+ be,pn %xcc, 24f /* CTI */
+ sllx %g6, 40, %o5 /* IEU0 */
+ andcc %o4, %o5, %g0 /* IEU1 Group */
+ be,pn %xcc, 24f /* CTI */
+
+ sllx %g6, 32, %o5 /* IEU0 */
+ andcc %o4, %o5, %g0 /* IEU1 Group */
+ be,pn %xcc, 24f /* CTI */
+23: sllx %g6, 24, %o5 /* IEU0 */
+
+ andcc %o4, %o5, %g0 /* IEU1 Group */
+ be,pn %icc, 24f /* CTI */
+ sllx %g6, 16, %o5 /* IEU0 */
+ andcc %o4, %o5, %g0 /* IEU1 Group */
+
+ be,pn %icc, 24f /* CTI */
+ sllx %g6, 8, %o5 /* IEU0 */
+ andcc %o4, %o5, %g0 /* IEU1 Group */
+ be,pn %icc, 24f /* CTI */
+
+ mov %g6, %o5 /* IEU0 */
+25: cmp %o4, %o3 /* IEU1 Group */
+5: mov -1, %o0 /* IEU0 */
+ retl /* CTI+IEU1 Group */
+
+ movgu %xcc, 1, %o0 /* Single Group */
+
+ .align 16
+24: sub %o5, 1, %g6 /* IEU0 Group */
+ clr %o0 /* IEU1 */
+ or %o5, %g6, %o5 /* IEU0 Group */
+ andn %o4, %o5, %o4 /* IEU0 Group */
+
+ andn %o3, %o5, %o3 /* IEU1 */
+ cmp %o4, %o3 /* IEU1 Group */
+ movgu %xcc, 1, %o0 /* Single Group */
+ retl /* CTI+IEU1 Group */
+
+ movlu %xcc, -1, %o0 /* Single Group */
+6: retl /* CTI+IEU1 Group */
+ mov %o4, %o0 /* IEU0 */
+
+ .align 16
+7: ldub [%o0], %o2 /* Load */
+ add %o0, 1, %o0 /* IEU1 */
+ ldub [%o1], %o3 /* Load Group */
+ sllx %g1, 32, %g2 /* IEU0 */
+
+8: add %o1, 1, %o1 /* IEU1 */
+ subcc %o2, %o3, %o4 /* IEU1 Group */
+ bne,pn %xcc, 6b /* CTI */
+ lduba [%o0] ASI_PNF, %o2 /* Load */
+
+ brz,pn %o3, 4b /* CTI+IEU1 Group */
+ lduba [%o1] ASI_PNF, %o3 /* Load */
+ andcc %o0, 7, %g0 /* IEU1 Group */
+ bne,a,pn %icc, 8b /* CTI */
+
+ add %o0, 1, %o0 /* IEU0 */
+ or %g1, %g2, %g1 /* IEU0 Group */
+ andcc %o1, 7, %g3 /* IEU1 */
+ be,a,pn %icc, 1b /* CTI */
+
+ ldxa [%o0] ASI_PNF, %o2 /* Load Group */
+9: sllx %g3, 3, %g5 /* IEU0 */
+ mov 64, %o5 /* IEU1 */
+ sub %o1, %g3, %o1 /* IEU0 Group */
+
+ sub %o5, %g5, %o5 /* IEU1 */
+ ldxa [%o1] ASI_PNF, %g6 /* Load Group */
+ or %g1, %g2, %g1 /* IEU0 */
+ sub %o1, %o0, %o1 /* IEU1 */
+
+ sllx %g1, 7, %g2 /* IEU0 Group */
+ add %o1, 8, %o1 /* IEU1 */
+ /* %g1 = 0101010101010101
+ * %g2 = 8080808080800880
+ * %g5 = number of bits to shift left
+ * %o5 = number of bits to shift right */
+10: sllx %g6, %g5, %o3 /* IEU0 Group */
+ ldxa [%o1 + %o0] ASI_PNF, %g6 /* Load */
+
+11: srlx %g6, %o5, %o4 /* IEU0 Group */
+ ldxa [%o0] ASI_PNF, %o2 /* Load */
+ or %o3, %o4, %o3 /* IEU1 */
+ add %o0, 8, %o0 /* IEU0 Group */
+
+ subcc %o2, %o3, %g0 /* IEU1 */
+#ifdef EIGHTBIT_NOT_RARE
+ sub %o2, %g1, %g3 /* IEU0 Group */
+ bne,pn %xcc, 13b /* CTI */
+ andn %g3, %o2, %g4 /* IEU0 Group */
+
+ andcc %g4, %g2, %g0 /* IEU1 Group */
+ be,pt %xcc, 10b /* CTI */
+ srlx %g4, 32, %g4 /* IEU0 */
+ andcc %g4, %g2, %g0 /* IEU1 Group */
+#else
+ bne,pn %xcc, 13b /* CTI */
+ sub %o2, %g1, %g3 /* IEU0 Group */
+ andcc %g3, %g2, %g0 /* IEU1 Group */
+
+ be,pt %xcc, 10b /* CTI */
+ srlx %g3, 32, %g3 /* IEU0 */
+ andcc %g3, %g2, %g0 /* IEU1 Group */
+#endif
+ be,pt %xcc, 12f /* CTI */
+
+ srlx %o2, 56, %g3 /* IEU0 */
+ andcc %g3, 0xff, %g0 /* IEU1 Group */
+ be,pn %icc, 4b /* CTI */
+ srlx %o2, 48, %g3 /* IEU0 */
+
+ andcc %g3, 0xff, %g0 /* IEU1 Group */
+ be,pn %icc, 4b /* CTI */
+ srlx %o2, 40, %g3 /* IEU0 */
+ andcc %g3, 0xff, %g0 /* IEU1 Group */
+
+ be,pn %icc, 4b /* CTI */
+ srlx %o2, 32, %g3 /* IEU0 */
+ andcc %g3, 0xff, %g0 /* IEU1 Group */
+ be,pn %icc, 4b /* CTI */
+
+12: srlx %o2, 24, %g3 /* IEU0 */
+ andcc %g3, 0xff, %g0 /* IEU1 Group */
+ be,pn %icc, 4b /* CTI */
+ srlx %o2, 16, %g3 /* IEU0 */
+
+ andcc %g3, 0xff, %g0 /* IEU1 Group */
+ be,pn %icc, 4b /* CTI */
+ srlx %o2, 8, %g3 /* IEU0 */
+ andcc %g3, 0xff, %g0 /* IEU1 Group */
+
+ be,pn %icc, 4b /* CTI */
+ andcc %o2, 0xff, %g0 /* IEU1 Group */
+ be,pn %icc, 4b /* CTI */
+ sllx %g6, %g5, %o3 /* IEU0 */
+
+ ba,pt %xcc, 11b /* CTI Group */
+ ldxa [%o1 + %o0] ASI_PNF, %g6 /* Load */
+END(strcmp)