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authorJoern Rennecke <joern.rennecke@embecosm.com>2013-12-13 14:49:24 +0530
committerBernhard Reutner-Fischer <rep.dot.nop@gmail.com>2013-12-20 14:38:23 +0100
commit1ce639990b6340a8b9f18d076c427fcf5a93695e (patch)
tree48f97b612dd4e8b085127a808e4774333903c38f /libc/string/arc/strlen.S
parent374db5d1748fe23d8203479c29ecff2b22fca95c (diff)
string: Add ARC support
Signed-off-by: Joern Rennecke <joern.rennecke@embecosm.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Diffstat (limited to 'libc/string/arc/strlen.S')
-rw-r--r--libc/string/arc/strlen.S84
1 files changed, 84 insertions, 0 deletions
diff --git a/libc/string/arc/strlen.S b/libc/string/arc/strlen.S
new file mode 100644
index 000000000..0b9b93815
--- /dev/null
+++ b/libc/string/arc/strlen.S
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ * Copyright (C) 2007 ARC International (UK) LTD
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+
+#include <sysdep.h>
+
+ENTRY(strlen)
+ or r3,r0,7
+ ld r2,[r3,-7]
+ ld.a r6,[r3,-3]
+ mov r4,0x01010101
+ ; uses long immediate
+#ifdef __LITTLE_ENDIAN__
+ asl_s r1,r0,3
+ btst_s r0,2
+ asl r7,r4,r1
+ ror r5,r4
+ sub r1,r2,r7
+ bic_s r1,r1,r2
+ mov.eq r7,r4
+ sub r12,r6,r7
+ bic r12,r12,r6
+ or.eq r12,r12,r1
+ and r12,r12,r5
+ brne r12,0,.Learly_end
+#else /* BIG ENDIAN */
+ ror r5,r4
+ btst_s r0,2
+ mov_s r1,31
+ sub3 r7,r1,r0
+ sub r1,r2,r4
+ bic_s r1,r1,r2
+ bmsk r1,r1,r7
+ sub r12,r6,r4
+ bic r12,r12,r6
+ bmsk.ne r12,r12,r7
+ or.eq r12,r12,r1
+ and r12,r12,r5
+ brne r12,0,.Learly_end
+#endif /* ENDIAN */
+
+.Loop:
+ ld_s r2,[r3,4]
+ ld.a r6,[r3,8]
+ ; stall for load result
+ sub r1,r2,r4
+ bic_s r1,r1,r2
+ sub r12,r6,r4
+ bic r12,r12,r6
+ or r12,r12,r1
+ and r12,r12,r5
+ breq r12,0,.Loop
+.Lend:
+ and.f r1,r1,r5
+ sub.ne r3,r3,4
+ mov.eq r1,r12
+#ifdef __LITTLE_ENDIAN__
+ sub_s r2,r1,1
+ bic_s r2,r2,r1
+ norm r1,r2
+ sub_s r0,r0,3
+ lsr_s r1,r1,3
+ sub r0,r3,r0
+ j_s.d [blink]
+ sub r0,r0,r1
+#else /* BIG ENDIAN */
+ lsr_s r1,r1,7
+ mov.eq r2,r6
+ bic_s r1,r1,r2
+ norm r1,r1
+ sub r0,r3,r0
+ lsr_s r1,r1,3
+ j_s.d [blink]
+ add r0,r0,r1
+#endif /* ENDIAN */
+.Learly_end:
+ b.d .Lend
+ sub_s.ne r1,r1,r1
+END(strlen)
+libc_hidden_def(strlen)