diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 8b809c4..a4f512f 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -6755,6 +6755,29 @@
 				? GEU : LTU, VOIDmode, cc, const0_rtx);
 })
 
+;; Help combine use borrow flag to test for -1 after dec (add $-1).
+(define_insn_and_split "*dec_cmov<mode>"
+  [(set (match_operand:SWI248 0 "register_operand" "=r")
+	(if_then_else:SWI248
+	 (match_operator 1 "bt_comparison_operator"
+	  [(match_operand:SWI248 2 "register_operand" "0") (const_int 0)])
+	 (plus:SWI248 (match_dup 2) (const_int -1))
+	 (match_operand:SWI248 3 "nonimmediate_operand" "rm")))
+   (clobber (reg:CC FLAGS_REG))]
+  "TARGET_CMOVE"
+  "#"
+  "&& reload_completed"
+  [(parallel [(set (reg:CC FLAGS_REG)
+		   (compare:CC (match_dup 2) (const_int 1)))
+	      (set (match_dup 0) (minus:SWI248 (match_dup 2) (const_int 1)))])
+   (set (match_dup 0)
+	(if_then_else:SWI248 (match_dup 4) (match_dup 0) (match_dup 3)))]
+{
+  rtx cc = gen_rtx_REG (CCCmode, FLAGS_REG);
+  operands[4] = gen_rtx_fmt_ee (GET_CODE (operands[1]) == NE
+				? GEU : LTU, VOIDmode, cc, const0_rtx);
+})
+
 (define_insn "*subsi_3_zext"
   [(set (reg FLAGS_REG)
 	(compare (match_operand:SI 1 "register_operand" "0")
@@ -19068,6 +19091,70 @@
     gcc_unreachable ();
 })
 
+;; Eliminate a reg-reg mov by inverting the condition of a cmov (#1).
+;; mov r0,r1; dec r0; mov r2,r3; cmov r0,r2 -> dec r1; mov r0,r3; cmov r0, r1
+(define_peephole2
+ [(set (match_operand:SWI248 0 "register_operand")
+       (match_operand:SWI248 1 "register_operand"))
+  (parallel [(set (reg FLAGS_REG) (match_operand 5))
+	     (set (match_dup 0) (match_operand:SWI248 6))])
+  (set (match_operand:SWI248 2 "register_operand")
+       (match_operand:SWI248 3))
+  (set (match_dup 0)
+       (if_then_else:SWI248 (match_operator 4 "ix86_comparison_operator"
+			     [(reg FLAGS_REG) (const_int 0)])
+	(match_dup 0)
+	(match_dup 2)))]
+ "TARGET_CMOVE
+  && REGNO (operands[2]) != REGNO (operands[0])
+  && REGNO (operands[2]) != REGNO (operands[1])
+  && peep2_reg_dead_p (1, operands[1])
+  && peep2_reg_dead_p (4, operands[2])
+  && !reg_overlap_mentioned_p (operands[0], operands[3])"
+ [(parallel [(set (match_dup 7) (match_dup 8))
+	     (set (match_dup 1) (match_dup 9))])
+  (set (match_dup 0) (match_dup 3))
+  (set (match_dup 0) (if_then_else:SWI248 (match_dup 4)
+					  (match_dup 1)
+					  (match_dup 0)))]
+{
+  operands[7] = SET_DEST (XVECEXP (PATTERN (peep2_next_insn (1)), 0, 0));
+  operands[8] = replace_rtx (operands[5], operands[0], operands[1]);
+  operands[9] = replace_rtx (operands[6], operands[0], operands[1]);
+})
+
+;; Eliminate a reg-reg mov by inverting the condition of a cmov (#2).
+;; mov r2,r3; mov r0,r1; dec r0; cmov r0,r2 -> dec r1; mov r0,r3; cmov r0, r1
+(define_peephole2
+ [(set (match_operand:SWI248 2 "register_operand")
+       (match_operand:SWI248 3))
+  (set (match_operand:SWI248 0 "register_operand")
+       (match_operand:SWI248 1 "register_operand"))
+  (parallel [(set (reg FLAGS_REG) (match_operand 5))
+	     (set (match_dup 0) (match_operand:SWI248 6))])
+  (set (match_dup 0)
+       (if_then_else:SWI248 (match_operator 4 "ix86_comparison_operator"
+			     [(reg FLAGS_REG) (const_int 0)])
+	(match_dup 0)
+	(match_dup 2)))]
+ "TARGET_CMOVE
+  && REGNO (operands[2]) != REGNO (operands[0])
+  && REGNO (operands[2]) != REGNO (operands[1])
+  && peep2_reg_dead_p (2, operands[1])
+  && peep2_reg_dead_p (4, operands[2])
+  && !reg_overlap_mentioned_p (operands[0], operands[3])"
+ [(parallel [(set (match_dup 7) (match_dup 8))
+	     (set (match_dup 1) (match_dup 9))])
+  (set (match_dup 0) (match_dup 3))
+  (set (match_dup 0) (if_then_else:SWI248 (match_dup 4)
+					  (match_dup 1)
+					  (match_dup 0)))]
+{
+  operands[7] = SET_DEST (XVECEXP (PATTERN (peep2_next_insn (2)), 0, 0));
+  operands[8] = replace_rtx (operands[5], operands[0], operands[1]);
+  operands[9] = replace_rtx (operands[6], operands[0], operands[1]);
+})
+
 (define_expand "mov<mode>cc"
   [(set (match_operand:X87MODEF 0 "register_operand")
 	(if_then_else:X87MODEF