diff --git a/src/arch/x86/isa/insts/arithmetic/increment_and_decrement.py b/src/arch/x86/isa/insts/arithmetic/increment_and_decrement.py
index c504d47ce..eed39c10c 100644
--- a/src/arch/x86/isa/insts/arithmetic/increment_and_decrement.py
+++ b/src/arch/x86/isa/insts/arithmetic/increment_and_decrement.py
@@ -53,7 +53,47 @@
 #
 # Authors: Gabe Black
 
-microcode = ""
+microcode = '''
+def macroop INC_R
+{
+    addi reg, reg, 1, flags=(OF, SF, ZF, AF, PF)
+};
+
+def macroop INC_M
+{
+    ld t1, ds, [scale, index, base], disp
+    addi t1, t1, 1, flags=(OF, SF, ZF, AF, PF)
+    st t1, ds, [scale, index, base], disp
+};
+
+def macroop INC_P
+{
+    rdip t7
+    ld t1, ds, [0, t0, t7], disp
+    addi reg, reg, 1, flags=(OF, SF, ZF, AF, PF)
+    st t1, ds, [0, t0, t7], disp
+};
+
+def macroop DEC_R
+{
+    subi reg, reg, 1, flags=(OF, SF, ZF, AF, PF)
+};
+
+def macroop DEC_M
+{
+    ld t1, ds, [scale, index, base], disp
+    subi t1, t1, 1, flags=(OF, SF, ZF, AF, PF)
+    st t1, ds, [scale, index, base], disp
+};
+
+def macroop DEC_P
+{
+    rdip t7
+    ld t1, ds, [0, t0, t7], disp
+    subi reg, reg, 1, flags=(OF, SF, ZF, AF, PF)
+    st t1, ds, [0, t0, t7], disp
+};
+'''
 #let {{
 #    class DEC(Inst):
 #	"GenFault ${new UnimpInstFault}"
diff --git a/src/arch/x86/isa/insts/arithmetic/multiply_and_divide.py b/src/arch/x86/isa/insts/arithmetic/multiply_and_divide.py
index 662022e6a..8697bef65 100644
--- a/src/arch/x86/isa/insts/arithmetic/multiply_and_divide.py
+++ b/src/arch/x86/isa/insts/arithmetic/multiply_and_divide.py
@@ -53,7 +53,31 @@
 #
 # Authors: Gabe Black
 
-microcode = ""
+microcode = '''
+
+#
+# Two operand signed multiply. These should set the CF and OF flags if the
+# result is too large for the destination register
+#
+
+def macroop IMUL_R_R
+{
+    mul1s reg, reg, regm
+};
+
+def macroop IMUL_R_M
+{
+    ld t1, ds, [scale, index, base], disp
+    mul1s reg, reg, t1
+};
+
+def macroop IMUL_R_P
+{
+    rdip t7
+    ld t1, ds, [scale, index, base], disp
+    mul1s reg, reg, t1
+};
+'''
 #let {{
 #    class MUL(Inst):
 #	"GenFault ${new UnimpInstFault}"