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authorVineet Gupta <vgupta@synopsys.com>2015-02-19 19:14:00 +0530
committerBernhard Reutner-Fischer <rep.dot.nop@gmail.com>2015-02-20 11:32:02 +0100
commitdf273fedf4fef25983ef6ec7e42b03d54f44960d (patch)
treed2194f5200e142d9e3a75c0b5106b776a0ee2a20 /libc/string/arc/arcv2/strcmp.S
parentafab56958f1cbb47b831ee3ebff231dfbae74af2 (diff)
ARCv2: optimised string routines
Signed-off-by: Claudiu Zissulescu <claziss@synopsys.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/arcv2/strcmp.S')
-rw-r--r--libc/string/arc/arcv2/strcmp.S83
1 files changed, 83 insertions, 0 deletions
diff --git a/libc/string/arc/arcv2/strcmp.S b/libc/string/arc/arcv2/strcmp.S
new file mode 100644
index 000000000..2e0e64a0c
--- /dev/null
+++ b/libc/string/arc/arcv2/strcmp.S
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <features.h>
+#include <sysdep.h>
+
+ENTRY(strcmp)
+ or r2, r0, r1
+ bmsk_s r2, r2, 1
+ brne r2, 0, @.Lcharloop
+
+;;; s1 and s2 are word aligned
+ ld.ab r2, [r0, 4]
+
+ mov_s r12, 0x01010101
+ ror r11, r12
+ .align 4
+.LwordLoop:
+ ld.ab r3, [r1, 4]
+ ;; Detect NULL char in str1
+ sub r4, r2, r12
+ ld.ab r5, [r0, 4]
+ bic r4, r4, r2
+ and r4, r4, r11
+ brne.d.nt r4, 0, .LfoundNULL
+ ;; Check if the read locations are the same
+ cmp r2, r3
+ beq.d .LwordLoop
+ mov.eq r2, r5
+
+ ;; A match is found, spot it out
+#ifdef __LITTLE_ENDIAN__
+ swape r3, r3
+ mov_s r0, 1
+ swape r2, r2
+#else
+ mov_s r0, 1
+#endif
+ cmp_s r2, r3
+ j_s.d [blink]
+ bset.lo r0, r0, 31
+
+ .align 4
+.LfoundNULL:
+#ifdef __BIG_ENDIAN__
+ swape r4, r4
+ swape r2, r2
+ swape r3, r3
+#endif
+ ;; Find null byte
+ ffs r0, r4
+ bmsk r2, r2, r0
+ bmsk r3, r3, r0
+ swape r2, r2
+ swape r3, r3
+ ;; make the return value
+ sub.f r0, r2, r3
+ mov.hi r0, 1
+ j_s.d [blink]
+ bset.lo r0, r0, 31
+
+ .align 4
+.Lcharloop:
+ ldb.ab r2, [r0, 1]
+ ldb.ab r3, [r1, 1]
+ nop
+ breq r2, 0, .Lcmpend
+ breq r2, r3, .Lcharloop
+
+ .align 4
+.Lcmpend:
+ j_s.d [blink]
+ sub r0, r2, r3
+END(strcmp)
+libc_hidden_def(strcmp)
+
+#ifndef __UCLIBC_HAS_LOCALE__
+strong_alias(strcmp,strcoll)
+libc_hidden_def(strcoll)
+#endif