diff -Nru mpfr4-3.1.0/debian/changelog mpfr4-3.1.0/debian/changelog
--- mpfr4-3.1.0/debian/changelog	2012-04-04 07:55:22.000000000 +0000
+++ mpfr4-3.1.0/debian/changelog	2012-04-04 11:45:50.000000000 +0000
@@ -1,3 +1,10 @@
+mpfr4 (3.1.0-3ubuntu2) precise; urgency=low
+
+  * Don't pessimize the amd64 build,
+    use -O3 -fno-tree-slp-vectorize.
+
+ -- Matthias Klose <doko@ubuntu.com>  Wed, 04 Apr 2012 13:42:43 +0200
+
 mpfr4 (3.1.0-3ubuntu1) precise; urgency=low
 
   * debian/rules: Build with -O2 on amd64, to work around internal compiler
diff -Nru mpfr4-3.1.0/debian/rules mpfr4-3.1.0/debian/rules
--- mpfr4-3.1.0/debian/rules	2012-04-04 07:56:40.000000000 +0000
+++ mpfr4-3.1.0/debian/rules	2012-04-04 11:46:37.000000000 +0000
@@ -43,10 +43,9 @@
     ifeq (m68k,$(DEB_HOST_ARCH))
 	CFLAGS += -O0
     else
+        CFLAGS += -O3
         ifeq (amd64,$(DEB_HOST_ARCH)) # LP#968766
-            CFLAGS += -O2
-	else
-	    CFLAGS += -O3
+	    CFLAGS += -fno-tree-slp-vectorize
         endif
     endif
 endif