Changeset 2596 for vendor/gnumake/current/hash.h

Timestamp:

Jun 20, 2012, 12:44:52 AM (13 years ago)

Author:

bird

Message:

gnumake/current -> 3.82-cvs.

Location:

vendor/gnumake/current

Files:

• . (modified) (1 prop)
• hash.h (modified) (5 diffs)

vendor/gnumake/current/hash.h

@@ -1 +1 @@
 /* hash.h -- decls for hash table
-Copyright (C) 1995, 1999, 2002 Free Software Foundation, Inc.
+Copyright (C) 1995, 1999, 2002, 2010 Free Software Foundation, Inc.
 Written by Greg McGary <gkm@gnu.org> <greg@mcgary.org>
 
@@ -81 +81 @@
 /* hash and comparison macros for case-sensitive string keys. */
 
+/* Due to the strcache, it's not uncommon for the string pointers to
+   be identical.  Take advantage of that to short-circuit string compares.  */
+
 #define STRING_HASH_1(KEY, RESULT) do { \
   unsigned char const *_key_ = (unsigned char const *) (KEY) - 1; \
@@ -104 +107 @@
 
 #define STRING_COMPARE(X, Y, RESULT) do { \
-  RESULT = strcmp ((X), (Y)); \
+    RESULT = (X) == (Y) ? 0 : strcmp ((X), (Y)); \
 } while (0)
 #define return_STRING_COMPARE(X, Y) do { \
-  return strcmp ((X), (Y)); \
+  return (X) == (Y) ? 0 : strcmp ((X), (Y)); \
 } while (0)
 
@@ -140 +143 @@
 
 #define STRING_N_COMPARE(X, Y, N, RESULT) do { \
-  RESULT = strncmp ((X), (Y), (N)); \
+  RESULT = (X) == (Y) ? 0 : strncmp ((X), (Y), (N)); \
 } while (0)
 #define return_STRING_N_COMPARE(X, Y, N) do { \
-  return strncmp ((X), (Y), (N)); \
+  return (X) == (Y) ? 0 : strncmp ((X), (Y), (N)); \
 } while (0)
 
@@ -173 +176 @@
 
 #define ISTRING_COMPARE(X, Y, RESULT) do { \
-  RESULT = strcasecmp ((X), (Y)); \
+  RESULT = (X) == (Y) ? 0 : strcasecmp ((X), (Y)); \
 } while (0)
 #define return_ISTRING_COMPARE(X, Y) do { \
-  return strcasecmp ((X), (Y)); \
+  return (X) == (Y) ? 0 : strcasecmp ((X), (Y)); \
 } while (0)