From: Paolo Bonzini <pbonzini@redhat.com>
Date: Fri, 11 Aug 2017 11:44:33 +0000 (+0200)
Subject: Do not use STOP_SET for singleton compares.
X-Git-Tag: 4.2.90~67
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0c44ca26830e29b9de8297719bc2bd05c16bf8f6;p=thirdparty%2Fmake.git

Do not use STOP_SET for singleton compares.

Compare against '$' directly rather than using MAP_VARIABLE.
This saves ~10% for find_map_function, which is the top hotspot in
QEMU's no-op build.  The build is sped up overall by about 1.5%
more (from 11.1s to 10.95s).

* read.c (find_map_function): Do not compare against singleton sets.
---

diff --git a/read.c b/read.c
index 2cd497a4..db1a42d0 100644
--- a/read.c
+++ b/read.c
@@ -2249,7 +2249,7 @@ find_map_unquote (char *string, int stopmap)
         break;
 
       /* If we stopped due to a variable reference, skip over its contents.  */
-      if (STOP_SET (*p, MAP_VARIABLE))
+      if (*p == '$')
         {
           char openparen = p[1];