diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index d25453f..e596f8b 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -2217,7 +2217,8 @@
 	  if (optimize_size > 1
 	      && TARGET_64BIT
 	      && CONST_INT_P (operands[1])
-	      && IN_RANGE (INTVAL (operands[1]), -128, 127))
+	      && IN_RANGE (INTVAL (operands[1]), -128, 127)
+	      && !MEM_P (operands[0]))
 	    return "push{q}\t%1\n\tpop{q}\t%0";
 	  return "mov{l}\t{%k1, %k0|%k0, %k1}";
 	}
@@ -2440,7 +2441,8 @@
 	return "lea{l}\t{%E1, %0|%0, %E1}";
       else if (optimize_size > 1
 	       && CONST_INT_P (operands[1])
-	       && IN_RANGE (INTVAL (operands[1]), -128, 127))
+	       && IN_RANGE (INTVAL (operands[1]), -128, 127)
+	       && !MEM_P (operands[0]))
 	{
 	  if (TARGET_64BIT)
 	    return "push{q}\t%1\n\tpop{q}\t%q0";
diff --git a/gcc/testsuite/gcc.target/i386/pr103773.c b/gcc/testsuite/gcc.target/i386/pr103773.c
new file mode 100644
index 0000000..1e4b8ce
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr103773.c
@@ -0,0 +1,12 @@
+/* { dg-do run } */
+/* { dg-options "-Oz" } */
+
+unsigned long long x;
+
+int main (void)
+{
+  __builtin_memset (&x, 0xff, 4);
+  if (x != 0xffffffff)
+    __builtin_abort ();
+  return 0;
+}