Copy from trunk.

1 files changed, 56 insertions, 0 deletions

diff --git a/libc/string/i386/strchr.c b/libc/string/i386/strchr.c
new file mode 100644
index 000000000..5fe689d1a
--- /dev/null
+++ b/libc/string/i386/strchr.c
@@ -0,0 +1,56 @@
+/*
+ * This string-include defines all string functions as inline
+ * functions. Use gcc. It also assumes ds=es=data space, this should be
+ * normal. Most of the string-functions are rather heavily hand-optimized,
+ * see especially strtok,strstr,str[c]spn. They should work, but are not
+ * very easy to understand. Everything is done entirely within the register
+ * set, making the functions fast and clean. String instructions have been
+ * used through-out, making for "slightly" unclear code :-)
+ *
+ *		NO Copyright (C) 1991, 1992 Linus Torvalds,
+ *		consider these trivial functions to be PD.
+ */
+
+/*
+ * Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/*
+ * Modified for uClibc by Erik Andersen <andersen@codepoet.org>
+ * These make no attempt to use nifty things like mmx/3dnow/etc.
+ * These are not inline, and will therefore not be as fast as
+ * modifying the headers to use inlines (and cannot therefore
+ * do tricky things when dealing with const memory).  But they
+ * should (I hope!) be faster than their generic equivalents....
+ *
+ * More importantly, these should provide a good example for
+ * others to follow when adding arch specific optimizations.
+ *  -Erik
+ */
+
+#include <string.h>
+
+#undef strchr
+char attribute_hidden *__strchr(const char *s, int c)
+{
+    int d0;
+    register char * __res;
+    __asm__ __volatile__(
+	    "movb %%al,%%ah\n"
+	    "1:\tlodsb\n\t"
+	    "cmpb %%ah,%%al\n\t"
+	    "je 2f\n\t"
+	    "testb %%al,%%al\n\t"
+	    "jne 1b\n\t"
+	    "movl $1,%1\n"
+	    "2:\tmovl %1,%0\n\t"
+	    "decl %0"
+	    :"=a" (__res), "=&S" (d0) : "1" (s),"0" (c));
+    return __res;
+}
+
+strong_alias(__strchr, strchr)
+
+weak_alias(strchr, index)