diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 65b49e245ec..2cc497ecc87 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2018-10-18  Richard Biener  <rguenther@suse.de>
+
+	* config/i386/i386.c: Fix costing of vector FMA.
+
 2018-10-18  Richard Biener  <rguenther@suse.de>
 
 	* config/i386/i386.c (ix86_vec_cost): Remove !parallel path
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index bada12ccd16..9a5b54978a9 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -40171,7 +40171,8 @@ ix86_rtx_costs (rtx x, machine_mode mode, int outer_code_i, int opno,
         gcc_assert (TARGET_FMA || TARGET_FMA4 || TARGET_AVX512F);
 
         *total = ix86_vec_cost (mode,
-				mode == SFmode ? cost->fmass : cost->fmasd);
+				GET_MODE_INNER (mode) == SFmode
+				? cost->fmass : cost->fmasd);
 	*total += rtx_cost (XEXP (x, 1), mode, FMA, 1, speed);
 
         /* Negate in op0 or op2 is free: FMS, FNMA, FNMS.  */