diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 4f3aa1c111c..5b2c3d4b983 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2012-08-14  Uros Bizjak  <ubizjak@gmail.com>
+
+	* config/i386/i386.md (enabled): Add comment with explanation
+	why fma4 instructions are disabled for generic code.
+
 2012-08-14  Oleg Endo  <olegendo@gcc.gnu.org>
 
 	PR target/52933
@@ -114,7 +119,8 @@
 	(verify_phi_args): Likewise.
 	(verify_ssa): Likewise.
 	* tree-stdarg.c (execute_optimize_stdarg): Likewise.
-	* tree-vect-loop-manip.c (slpeel_update_phi_nodes_for_guard1): Likewise.
+	* tree-vect-loop-manip.c (slpeel_update_phi_nodes_for_guard1):
+	Likewise.
 	(slpeel_tree_peel_loop_to_edge): Likewise.
 	(vect_can_advance_ivs_p): Likewise.
 	(vect_update_ivs_after_vectorizer): Likewise.
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 8d6f211b52f..16a5c13bea7 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -659,6 +659,9 @@
 	 (eq_attr "isa" "noavx2") (symbol_ref "!TARGET_AVX2")
 	 (eq_attr "isa" "bmi2") (symbol_ref "TARGET_BMI2")
 	 (eq_attr "isa" "fma") (symbol_ref "TARGET_FMA")
+	 ;; Disable generation of FMA4 instructions for generic code
+	 ;; since FMA3 is preferred for targets that implement both
+	 ;; instruction sets.
 	 (eq_attr "isa" "fma4")
 	   (symbol_ref "TARGET_FMA4 && !TARGET_FMA")
 	]