--- gcc/config/i386.md	2018/04/24 16:53:28	1.1.1.1
+++ gcc/config/i386.md	2018/04/24 16:55:13	1.1.1.2
@@ -390,7 +390,10 @@
       xops[2] = stack_pointer_rtx;
 /*      fp_pop_level--; */
       output_asm_insn (AS2 (sub%L0,%1,%2), xops);
-      output_asm_insn (\"fstp%S0 %0\", xops);
+      if (top_dead_p (insn))
+        output_asm_insn (\"fstp%S0 %0\", xops);
+      else
+        output_asm_insn (\"fst%S0\", xops);
       RET;
     }
   return \"push%L0 %1\";
@@ -426,7 +429,10 @@
       xops[2] = stack_pointer_rtx;
 /*      fp_pop_level--; */
       output_asm_insn (AS2 (sub%L0,%1,%2), xops);
-      output_asm_insn (\"fstp%Q0 %0\", xops);
+      if (top_dead_p(insn))
+        output_asm_insn (\"fstp%Q0 %0\", xops);
+      else
+        output_asm_insn (\"fst%Q0 %0\", xops);
       RETCOM (pushdf);
     }
   else
@@ -544,21 +550,21 @@
 	(truncate:QI
 	 (match_operand:SI 1 "general_operand" "qi,m")))]
   ""
-  "mov%B0 %1,%0")
+  "mov%B0 %b1,%0")
 
 (define_insn "trunchiqi2"
   [(set (match_operand:QI 0 "general_operand" "=qm,q")
 	(truncate:QI
 	 (match_operand:HI 1 "general_operand" "qi,m")))]
   ""
-  "mov%B0 %1,%0")
+  "mov%B0 %b1,%0")
 
 (define_insn "truncsihi2"
   [(set (match_operand:HI 0 "general_operand" "=rm,r")
 	(truncate:HI
 	 (match_operand:SI 1 "general_operand" "ri,m")))]
   ""
-  "mov%W0 %1,%0")
+  "mov%W0 %w1,%0")
 
 ;;- zero extension instructions
 ;; Note that the one starting from HImode comes before those for QImode