import sparc-optimized string functions from glibc

1 files changed, 261 insertions, 0 deletions

diff --git a/libc/string/sparc/sparc64/memchr.S b/libc/string/sparc/sparc64/memchr.S
new file mode 100644
index 000000000..a10dfbc63
--- /dev/null
+++ b/libc/string/sparc/sparc64/memchr.S
@@ -0,0 +1,261 @@
+/* memchr (str, ch, n) -- Return pointer to first occurrence of CH in STR less
+   than N.
+   For SPARC v9.
+   Copyright (C) 1998, 1999, 2000, 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>.
+   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.  */
+
+#include <asm/asi.h>
+#ifndef XCC
+#define XCC xcc
+#define USE_BPR
+	.register	%g2, #scratch
+	.register	%g3, #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(__memchr)
+	and		%o1, 0xff, %o1			/* IEU0		Group		*/
+#ifdef USE_BPR
+	brz,pn		%o2, 12f			/* CTI+IEU1			*/
+#else
+	tst		%o2				/* IEU1				*/
+	be,pn		%XCC, 12f			/* CTI				*/
+#endif
+	 sll		%o1, 8, %g3			/* IEU0		Group		*/
+	add		%o0, %o2, %o2			/* IEU1				*/
+
+	sethi		%hi(0x01010101), %g1		/* IEU0		Group		*/
+	or		%g3, %o1, %g3			/* IEU1				*/
+	ldub		[%o0], %o3			/* Load				*/
+	sllx		%g3, 16, %g5			/* IEU0		Group		*/
+
+	or		%g1, %lo(0x01010101), %g1	/* IEU1				*/
+	sllx		%g1, 32, %g2			/* IEU0		Group		*/
+	or		%g3, %g5, %g3			/* IEU1				*/
+	sllx		%g3, 32, %g5			/* IEU0		Group		*/
+
+	cmp		%o3, %o1			/* IEU1				*/
+	be,pn		%xcc, 13f			/* CTI				*/
+	 or		%g1, %g2, %g1			/* IEU0		Group		*/
+	andcc		%o0, 7, %g0			/* IEU1				*/
+
+	bne,a,pn	%icc, 21f			/* CTI				*/
+	 add		%o0, 1, %o0			/* IEU0		Group		*/
+	ldx		[%o0], %o3			/* Load		Group		*/
+	sllx		%g1, 7, %g2			/* IEU0				*/
+
+	or		%g3, %g5, %g3			/* IEU1				*/
+1:	add		%o0, 8, %o0			/* IEU0		Group		*/
+	xor		%o3, %g3, %o4			/* IEU1				*/
+							/* %g1 = 0101010101010101	*
+							 * %g2 = 8080088080808080	*
+							 * %g3 =  c c c c c c c c	*
+							 * %o3 =      value		*
+							 * %o4 =   value XOR c		*/
+2:	cmp		%o0, %o2			/* IEU1		Group		*/
+
+	bg,pn		%XCC, 11f			/* CTI				*/
+	 ldxa		[%o0] ASI_PNF, %o3		/* Load				*/
+	sub		%o4, %g1, %o5			/* IEU0		Group		*/
+	add		%o0, 8, %o0			/* IEU1				*/
+#ifdef EIGHTBIT_NOT_RARE
+	andn		%o5, %o4, %o5			/* IEU0		Group		*/
+#endif
+
+	andcc		%o5, %g2, %g0			/* IEU1		Group		*/
+	be,a,pt		%xcc, 2b			/* CTI				*/
+	 xor		%o3, %g3, %o4			/* IEU0				*/
+	srlx		%o4, 56, %g5			/* IEU0				*/
+
+	andcc		%g5, 0xff, %g0			/* IEU1		Group		*/
+	be,pn		%icc, 3f			/* CTI				*/
+	 srlx		%o4, 48, %g5			/* IEU0				*/
+	andcc		%g5, 0xff, %g0			/* IEU1		Group		*/
+
+	be,pn		%icc, 4f			/* CTI				*/
+	 srlx		%o4, 40, %g5			/* IEU0				*/
+	andcc		%g5, 0xff, %g0			/* IEU1		Group		*/
+	be,pn		%icc, 5f			/* CTI				*/
+
+	 srlx		%o4, 32, %g5			/* IEU0				*/
+	andcc		%g5, 0xff, %g0			/* IEU1		Group		*/
+	be,pn		%icc, 6f			/* CTI				*/
+	 srlx		%o4, 24, %g5			/* IEU0				*/
+
+	andcc		%g5, 0xff, %g0			/* IEU1		Group		*/
+	be,pn		%icc, 7f			/* CTI				*/
+	 srlx		%o4, 16, %g5			/* IEU0				*/
+	andcc		%g5, 0xff, %g0			/* IEU1		Group		*/
+
+	be,pn		%icc, 8f			/* CTI				*/
+	 srlx		%o4, 8, %g5			/* IEU0				*/
+	andcc		%g5, 0xff, %g0			/* IEU1		Group		*/
+	be,pn		%icc, 9f			/* CTI				*/
+
+	 andcc		%o4, 0xff, %g0			/* IEU1		Group		*/
+	bne,pt		%icc, 2b			/* CTI				*/
+	 xor		%o3, %g3, %o4			/* IEU0				*/
+	retl						/* CTI+IEU1	Group		*/
+
+	 add		%o0, -9, %o0			/* IEU0				*/
+
+	.align		16
+3:	retl						/* CTI+IEU1	Group		*/
+	 add		%o0, -16, %o0			/* IEU0				*/
+4:   	retl						/* CTI+IEU1	Group		*/
+	 add		%o0, -15, %o0			/* IEU0				*/
+
+5:	retl						/* CTI+IEU1	Group		*/
+	 add		%o0, -14, %o0			/* IEU0				*/
+6:	retl						/* CTI+IEU1	Group		*/
+	 add		%o0, -13, %o0			/* IEU0				*/
+
+7:	retl						/* CTI+IEU1	Group		*/
+	 add		%o0, -12, %o0			/* IEU0				*/
+8:	retl						/* CTI+IEU1	Group		*/
+	 add		%o0, -11, %o0			/* IEU0				*/
+
+9:	retl						/* CTI+IEU1	Group		*/
+	 add		%o0, -10, %o0			/* IEU0				*/
+11:	sub		%o4, %g1, %o5			/* IEU0		Group		*/
+	sub		%o0, 8, %o0			/* IEU1				*/
+
+	andcc		%o5, %g2, %g0			/* IEU1		Group		*/
+	be,pt		%xcc, 12f			/* CTI				*/
+	 sub		%o2, %o0, %o2			/* IEU0				*/
+	tst		%o2				/* IEU1		Group		*/
+
+	be,pn		%XCC, 12f			/* CTI				*/
+	 srlx		%o4, 56, %g5			/* IEU0				*/
+	andcc		%g5, 0xff, %g0			/* IEU1		Group		*/
+	be,pn		%icc, 13f			/* CTI				*/
+
+	 cmp		%o2, 1				/* IEU0				*/
+	be,pn		%XCC, 12f			/* CTI		Group		*/
+	 srlx		%o4, 48, %g5			/* IEU0				*/
+	andcc		%g5, 0xff, %g0			/* IEU1		Group		*/
+
+	be,pn		%icc, 14f			/* CTI				*/
+	 cmp		%o2, 2				/* IEU1		Group		*/
+	be,pn		%XCC, 12f			/* CTI				*/
+	 srlx		%o4, 40, %g5			/* IEU0				*/
+
+	andcc		%g5, 0xff, %g0			/* IEU1		Group		*/
+	be,pn		%icc, 15f			/* CTI				*/
+	 cmp		%o2, 3				/* IEU1		Group		*/
+	be,pn		%XCC, 12f			/* CTI				*/
+
+	 srlx		%o4, 32, %g5			/* IEU0				*/
+	andcc		%g5, 0xff, %g0			/* IEU1		Group		*/
+	be,pn		%icc, 16f			/* CTI				*/
+	 cmp		%o2, 4				/* IEU1		Group		*/
+
+	be,pn		%XCC, 12f			/* CTI				*/
+	 srlx		%o4, 24, %g5			/* IEU0				*/
+	andcc		%g5, 0xff, %g0			/* IEU1		Group		*/
+	be,pn		%icc, 17f			/* CTI				*/
+
+	 cmp		%o2, 5				/* IEU1		Group		*/
+	be,pn		%XCC, 12f			/* CTI				*/
+	 srlx		%o4, 16, %g5			/* IEU0				*/
+	andcc		%g5, 0xff, %g0			/* IEU1		Group		*/
+
+	be,pn		%icc, 18f			/* CTI				*/
+	 cmp		%o2, 6				/* IEU1		Group		*/
+	be,pn		%XCC, 12f			/* CTI				*/
+	 srlx		%o4, 8, %g5			/* IEU0				*/
+
+	andcc		%g5, 0xff, %g0			/* IEU1		Group		*/
+	be,pn		%icc, 19f			/* CTI				*/
+	 nop						/* IEU0				*/
+12:	retl						/* CTI+IEU1	Group		*/
+
+	 clr		%o0				/* IEU0				*/
+	nop						/* Stub				*/
+13:	retl						/* CTI+IEU1	Group		*/
+	 nop						/* IEU0				*/
+
+14:	retl						/* CTI+IEU1	Group		*/
+	 add		%o0, 1, %o0			/* IEU0				*/
+15:	retl						/* CTI+IEU1	Group		*/
+	 add		%o0, 2, %o0			/* IEU0				*/
+
+16:	retl						/* CTI+IEU1	Group		*/
+	 add		%o0, 3, %o0			/* IEU0				*/
+17:	retl						/* CTI+IEU1	Group		*/
+	 add		%o0, 4, %o0			/* IEU0				*/
+
+18:	retl						/* CTI+IEU1	Group		*/
+	 add		%o0, 5, %o0			/* IEU0				*/
+19:	retl						/* CTI+IEU1	Group		*/
+	 add		%o0, 6, %o0			/* IEU0				*/
+
+21:	cmp		%o0, %o2			/* IEU1				*/
+	be,pn		%XCC, 12b			/* CTI				*/
+	 sllx		%g1, 7, %g2			/* IEU0		Group		*/
+	ldub		[%o0], %o3			/* Load				*/
+
+	or		%g3, %g5, %g3			/* IEU1				*/
+22:	andcc		%o0, 7, %g0			/* IEU1		Group		*/
+	be,a,pn		%icc, 1b			/* CTI				*/
+	 ldx		[%o0], %o3			/* Load				*/
+
+	cmp		%o3, %o1			/* IEU1		Group		*/
+	be,pn		%xcc, 23f			/* CTI				*/
+	 add		%o0, 1, %o0			/* IEU0				*/
+	cmp		%o0, %o2			/* IEU1		Group		*/
+
+	bne,a,pt	%XCC, 22b			/* CTI				*/
+	 ldub		[%o0], %o3			/* Load				*/
+	retl						/* CTI+IEU1	Group		*/
+	 clr		%o0				/* IEU0				*/
+
+23:	retl						/* CTI+IEU1	Group		*/
+	 add		%o0, -1, %o0			/* IEU0				*/
+END(__memchr)
+
+weak_alias (__memchr, memchr)
+#if !__BOUNDED_POINTERS__
+weak_alias (__memchr, __ubp_memchr)
+#endif