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authorDenis Vlasenko <vda.linux@googlemail.com>2008-12-20 14:34:19 +0000
committerDenis Vlasenko <vda.linux@googlemail.com>2008-12-20 14:34:19 +0000
commit7dd438230613f3a29babf22543ee9ed89b8828d1 (patch)
tree212ad123e170bf3ee27b277aae54a67f9f17a0e0 /libc
parent1d5c6ff2a4e8624a24165a9f3469b43113447b9d (diff)
libc/string/i386/rawmemchr.c: i386 version, adapted from strlen()
libc/string/i386/strlen.c: small optimization, same code size) text data bss dec hex filename - 240449 1759 11960 254168 3e0d8 lib/libuClibc-0.9.30-svn.so + 240339 1759 11960 254058 3e06a lib/libuClibc-0.9.30-svn.so
Diffstat (limited to 'libc')
-rw-r--r--libc/string/i386/rawmemchr.c24
-rw-r--r--libc/string/i386/strlen.c18
2 files changed, 33 insertions, 9 deletions
diff --git a/libc/string/i386/rawmemchr.c b/libc/string/i386/rawmemchr.c
new file mode 100644
index 000000000..be0b142c3
--- /dev/null
+++ b/libc/string/i386/rawmemchr.c
@@ -0,0 +1,24 @@
+/*
+ * Adapted from strlen.c code
+ *
+ * Copyright (C) 2008 Denys Vlasenko <vda.linux@googlemail.com>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <string.h>
+
+#undef rawmemchr
+void *rawmemchr(const void *s, int c)
+{
+ void *eax;
+ int ecx, edi;
+ __asm__ __volatile__(
+ " repne; scasb\n"
+ " leal -1(%%edi), %%eax\n"
+ : "=&c" (ecx), "=&D" (edi), "=&a" (eax)
+ : "0" (0xffffffff), "1" (s), "2" (c)
+ );
+ return eax;
+}
+libc_hidden_def(rawmemchr)
diff --git a/libc/string/i386/strlen.c b/libc/string/i386/strlen.c
index 761d27aae..ff2baeb38 100644
--- a/libc/string/i386/strlen.c
+++ b/libc/string/i386/strlen.c
@@ -35,14 +35,14 @@
#undef strlen
size_t strlen(const char *s)
{
- int d0;
- register int __res;
- __asm__ __volatile__(
- "repne\n\t"
- "scasb\n\t"
- "notl %0\n\t"
- "decl %0"
- :"=c" (__res), "=&D" (d0) :"1" (s),"a" (0), "0" (0xffffffff));
- return __res;
+ int eax, ecx, edi;
+ __asm__ __volatile__(
+ " repne; scasb\n"
+ " notl %%ecx\n"
+ " leal -1(%%ecx), %%eax\n"
+ : "=&c" (ecx), "=&D" (edi), "=&a" (eax)
+ : "0" (0xffffffff), "1" (s), "2" (0)
+ );
+ return eax;
}
libc_hidden_def(strlen)