From bde2b57f073721eedd7cbf1b41d598aa7c1133b4 Mon Sep 17 00:00:00 2001
From: Vitor Santos Costa <vsc@dcc.fc.up.pt>
Date: Mon, 9 Feb 2009 22:29:44 +0000
Subject: [PATCH] compile =/2 to use an extra temporary, and not ARG1.

---
 C/compiler.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/C/compiler.c b/C/compiler.c
index 75d5e9c47..1529072fe 100644
--- a/C/compiler.c
+++ b/C/compiler.c
@@ -872,13 +872,14 @@ c_eq(Term t1, Term t2, compiler_struct *cglobs)
   }
   /* first argument is an unbound var */
   if (IsNewVar(t1)) {
+    Int v = --cglobs->tmpreg;
     if (IsVarTerm(t2)) {
-      c_var(t2, 1, 0, 0, cglobs);
+      c_var(t2, v, 0, 0, cglobs);
     } else {
-      c_arg(1, t2, 0, 0, cglobs);
+      c_arg(v, t2, 0, 0, cglobs);
     }
     cglobs->onhead = TRUE;
-    c_var(t1, 1, 0, 0, cglobs);
+    c_var(t1, v, 0, 0, cglobs);
     cglobs->onhead = FALSE;    
   } else {
     c_var(t1, 0, 0, 0, cglobs);