diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index df47a53d701d..ddd1c7161d4d 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -1423,23 +1423,15 @@ ix86_function_arg_regno_p (int regno)
   enum calling_abi call_abi;
   const int *parm_regs;
 
-  if (!TARGET_64BIT)
-    {
-      if (TARGET_MACHO)
-        return (regno < REGPARM_MAX
-                || (TARGET_SSE && SSE_REGNO_P (regno) && !fixed_regs[regno]));
-      else
-        return (regno < REGPARM_MAX
-	        || (TARGET_MMX && MMX_REGNO_P (regno)
-	  	    && (regno < FIRST_MMX_REG + MMX_REGPARM_MAX))
-	        || (TARGET_SSE && SSE_REGNO_P (regno)
-		    && (regno < FIRST_SSE_REG + SSE_REGPARM_MAX)));
-    }
-
   if (TARGET_SSE && SSE_REGNO_P (regno)
-      && (regno < FIRST_SSE_REG + SSE_REGPARM_MAX))
+      && regno < FIRST_SSE_REG + SSE_REGPARM_MAX)
     return true;
 
+   if (!TARGET_64BIT)
+     return (regno < REGPARM_MAX
+	     || (TARGET_MMX && MMX_REGNO_P (regno)
+		 && regno < FIRST_MMX_REG + MMX_REGPARM_MAX));
+
   /* TODO: The function should depend on current function ABI but
      builtins.c would need updating then. Therefore we use the
      default ABI.  */
diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
index 760c60fb54f3..d0c157a9970c 100644
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -1950,7 +1950,9 @@ typedef struct ix86_args {
       : X86_64_SSE_REGPARM_MAX)						\
    : X86_32_SSE_REGPARM_MAX)
 
-#define MMX_REGPARM_MAX (TARGET_64BIT ? 0 : (TARGET_MMX ? 3 : 0))
+#define X86_32_MMX_REGPARM_MAX (TARGET_MMX ? (TARGET_MACHO ? 0 : 3) : 0)
+
+#define MMX_REGPARM_MAX (TARGET_64BIT ? 0 : X86_32_MMX_REGPARM_MAX)
 
 /* Specify the machine mode that this machine uses
    for the index in the tablejump instruction.  */