From 0c44ca26830e29b9de8297719bc2bd05c16bf8f6 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Fri, 11 Aug 2017 13:44:33 +0200
Subject: [PATCH] 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.
---
 read.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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];