diff --git a/ChangeLog b/ChangeLog
index 16d77fc006..62c95dd108 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Tue Jul 20 18:39:18 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* include/ruby/ruby.h (RSTRING_GETMEM): new macro to get ptr and
+	  len at once.
+
+	* string.c (rb_str_cmp, str_eql, rb_str_eql): trivial improvements.
+
 Tue Jul 20 18:23:04 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ext/fiddle/closure.c (closure_data_type),
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 7fcbf33bda..936493c028 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -647,10 +647,12 @@ struct RString {
 #define RSTRING_NOEMBED FL_USER1
 #define RSTRING_EMBED_LEN_MASK (FL_USER2|FL_USER3|FL_USER4|FL_USER5|FL_USER6)
 #define RSTRING_EMBED_LEN_SHIFT (FL_USHIFT+2)
+#define RSTRING_EMBED_LEN(str) \
+     (long)((RBASIC(str)->flags >> RSTRING_EMBED_LEN_SHIFT) & \
+            (RSTRING_EMBED_LEN_MASK >> RSTRING_EMBED_LEN_SHIFT))
 #define RSTRING_LEN(str) \
     (!(RBASIC(str)->flags & RSTRING_NOEMBED) ? \
-     (long)((RBASIC(str)->flags >> RSTRING_EMBED_LEN_SHIFT) & \
-            (RSTRING_EMBED_LEN_MASK >> RSTRING_EMBED_LEN_SHIFT)) : \
+     RSTRING_EMBED_LEN(str) : \
      RSTRING(str)->as.heap.len)
 #define RSTRING_PTR(str) \
     (!(RBASIC(str)->flags & RSTRING_NOEMBED) ? \
@@ -658,11 +660,13 @@ struct RString {
      RSTRING(str)->as.heap.ptr)
 #define RSTRING_END(str) \
     (!(RBASIC(str)->flags & RSTRING_NOEMBED) ? \
-     (RSTRING(str)->as.ary + \
-      ((RBASIC(str)->flags >> RSTRING_EMBED_LEN_SHIFT) & \
-       (RSTRING_EMBED_LEN_MASK >> RSTRING_EMBED_LEN_SHIFT))) : \
+     (RSTRING(str)->as.ary + RSTRING_EMBED_LEN(str)) : \
      (RSTRING(str)->as.heap.ptr + RSTRING(str)->as.heap.len))
 #define RSTRING_LENINT(str) rb_long2int(RSTRING_LEN(str))
+#define RSTRING_GETMEM(str, ptrvar, lenvar) \
+    (!(RBASIC(str)->flags & RSTRING_NOEMBED) ? \
+     ((ptrvar) = RSTRING(str)->as.ary, (lenvar) = RSTRING_EMBED_LEN(str)) : \
+     ((ptrvar) = RSTRING(str)->as.heap.ptr, (lenvar) = RSTRING(str)->as.heap.len))
 
 #define RARRAY_EMBED_LEN_MAX 3
 struct RArray {
diff --git a/string.c b/string.c
index 1b06370bb7..6610576de3 100644
--- a/string.c
+++ b/string.c
@@ -2100,13 +2100,15 @@ rb_str_comparable(VALUE str1, VALUE str2)
 int
 rb_str_cmp(VALUE str1, VALUE str2)
 {
-    long len;
+    long len1, len2;
+    const char *ptr1, *ptr2;
     int retval;
 
-    len = lesser(RSTRING_LEN(str1), RSTRING_LEN(str2));
-    retval = memcmp(RSTRING_PTR(str1), RSTRING_PTR(str2), len);
-    if (retval == 0) {
-	if (RSTRING_LEN(str1) == RSTRING_LEN(str2)) {
+    if (str1 == str2) return 0;
+    RSTRING_GETMEM(str1, ptr1, len1);
+    RSTRING_GETMEM(str2, ptr2, len2);
+    if (ptr1 == ptr2 || (retval = memcmp(ptr1, ptr2, lesser(len1, len2))) == 0) {
+	if (len1 == len2) {
 	    if (!rb_str_comparable(str1, str2)) {
 		if (ENCODING_GET(str1) > ENCODING_GET(str2))
 		    return 1;
@@ -2114,7 +2116,7 @@ rb_str_cmp(VALUE str1, VALUE str2)
 	    }
 	    return 0;
 	}
-	if (RSTRING_LEN(str1) > RSTRING_LEN(str2)) return 1;
+	if (len1 > len2) return 1;
 	return -1;
     }
     if (retval > 0) return 1;
@@ -2126,10 +2128,13 @@ static VALUE
 str_eql(const VALUE str1, const VALUE str2)
 {
     const long len = RSTRING_LEN(str1);
+    const char *ptr1, *ptr2;
 
     if (len != RSTRING_LEN(str2)) return Qfalse;
     if (!rb_str_comparable(str1, str2)) return Qfalse;
-    if (memcmp(RSTRING_PTR(str1), RSTRING_PTR(str2), len) == 0)
+    if ((ptr1 = RSTRING_PTR(str1)) == (ptr2 = RSTRING_PTR(str2)))
+	return Qtrue;
+    if (memcmp(ptr1, ptr2, len) == 0)
 	return Qtrue;
     return Qfalse;
 }
@@ -2165,6 +2170,7 @@ rb_str_equal(VALUE str1, VALUE str2)
 static VALUE
 rb_str_eql(VALUE str1, VALUE str2)
 {
+    if (str1 == str2) return Qtrue;
     if (TYPE(str2) != T_STRING) return Qfalse;
     return str_eql(str1, str2);
 }