diff --git a/src/arch/x86/isa/decoder/two_byte_opcodes.isa b/src/arch/x86/isa/decoder/two_byte_opcodes.isa
index 2c58798b3..39d56212d 100644
--- a/src/arch/x86/isa/decoder/two_byte_opcodes.isa
+++ b/src/arch/x86/isa/decoder/two_byte_opcodes.isa
@@ -554,22 +554,22 @@
                     0x0: Inst::PUNPCKLBW(Pq,Qd);
                     0x1: Inst::PUNPCKLWD(Pq,Qd);
                     0x2: Inst::PUNPCKLDQ(Pq,Qd);
-                    0x3: packsswb_Pq_Qq();
+                    0x3: Inst::PACKSSWB(Pq,Qq);
                     0x4: pcmpgtb_Pq_Qq();
                     0x5: pcmpgtw_Pq_Qq();
                     0x6: pcmpgtd_Pq_Qq();
-                    0x7: packuswb_Pq_Qq();
+                    0x7: Inst::PACKUSWB(Pq,Qq);
                 }
                 // operand size (0x66)
                 0x1: decode OPCODE_OP_BOTTOM3 {
                     0x0: Inst::PUNPCKLBW(Vo,Wq);
                     0x1: Inst::PUNPCKLWD(Vo,Wq);
                     0x2: Inst::PUNPCKLDQ(Vo,Wq);
-                    0x3: packsswb_Vo_Wo();
+                    0x3: Inst::PACKSSWB(Vo,Wo);
                     0x4: pcmpgtb_Vo_Wo();
                     0x5: pcmpgtw_Vo_Wo();
                     0x6: pcmpgtd_Vo_Wo();
-                    0x7: packuswb_Vo_Wo();
+                    0x7: Inst::PACKUSWB(Vo,Wo);
                 }
                 default: Inst::UD2();
             }
@@ -579,7 +579,7 @@
                     0x0: Inst::PUNPCKHBW(Pq,Qq);
                     0x1: Inst::PUNPCKHWD(Pq,Qq);
                     0x2: Inst::PUNPCKHDQ(Pq,Qq);
-                    0x3: packssdw_Pq_Qq();
+                    0x3: Inst::PACKSSDW(Pq,Qq);
                     0x6: Inst::MOVD(Pq,Edp);
                     0x7: Inst::MOVQ(Pq,Qq);
                     default: Inst::UD2();
@@ -594,7 +594,7 @@
                     0x0: Inst::PUNPCKHBW(Vo,Wo);
                     0x1: Inst::PUNPCKHWD(Vo,Wo);
                     0x2: Inst::PUNPCKHDQ(Vo,Wo);
-                    0x3: packssdw_Vo_Wo();
+                    0x3: Inst::PACKSSDW(Vo,Wo);
                     0x4: Inst::PUNPCKLQDQ(Vo,Wq);
                     0x5: Inst::PUNPCKHQDQ(Vo,Wq);
                     0x6: movd_Vo_Ed();
diff --git a/src/arch/x86/isa/insts/simd128/integer/data_reordering/pack_with_saturation.py b/src/arch/x86/isa/insts/simd128/integer/data_reordering/pack_with_saturation.py
index 859d2bc7e..9112a7382 100644
--- a/src/arch/x86/isa/insts/simd128/integer/data_reordering/pack_with_saturation.py
+++ b/src/arch/x86/isa/insts/simd128/integer/data_reordering/pack_with_saturation.py
@@ -54,7 +54,66 @@
 # Authors: Gabe Black
 
 microcode = '''
-# PACKSSDW
-# PACKSSWB
-# PACKUSWB
+def macroop PACKSSDW_XMM_XMM {
+    pack ufp1, xmml, xmmh, ext=1, srcSize=4, destSize=2
+    pack xmmh, xmmlm, xmmhm, ext=1, srcSize=4, destSize=2
+    movfp xmml, ufp1, dataSize=8
+};
+
+def macroop PACKSSDW_XMM_M {
+    ldfp ufp1, seg, sib, "DISPLACEMENT", dataSize=8
+    ldfp ufp2, seg, sib, "DISPLACEMENT + 8", dataSize=8
+    pack xmml, xmml, xmmh, ext=1, srcSize=4, destSize=2
+    pack xmmh, ufp1, ufp2, ext=1, srcSize=4, destSize=2
+};
+
+def macroop PACKSSDW_XMM_P {
+    rdip t7
+    ldfp ufp1, seg, riprel, "DISPLACEMENT", dataSize=8
+    ldfp ufp2, seg, riprel, "DISPLACEMENT + 8", dataSize=8
+    pack xmml, xmml, xmmh, ext=1, srcSize=4, destSize=2
+    pack xmmh, ufp1, ufp2, ext=1, srcSize=4, destSize=2
+};
+
+def macroop PACKSSWB_XMM_XMM {
+    pack ufp1, xmml, xmmh, ext=1, srcSize=2, destSize=1
+    pack xmmh, xmmlm, xmmhm, ext=1, srcSize=2, destSize=1
+    movfp xmml, ufp1, dataSize=8
+};
+
+def macroop PACKSSWB_XMM_M {
+    ldfp ufp1, seg, sib, "DISPLACEMENT", dataSize=8
+    ldfp ufp2, seg, sib, "DISPLACEMENT + 8", dataSize=8
+    pack xmml, xmml, xmmh, ext=1, srcSize=2, destSize=1
+    pack xmmh, ufp1, ufp2, ext=1, srcSize=2, destSize=1
+};
+
+def macroop PACKSSWB_XMM_P {
+    rdip t7
+    ldfp ufp1, seg, riprel, "DISPLACEMENT", dataSize=8
+    ldfp ufp2, seg, riprel, "DISPLACEMENT + 8", dataSize=8
+    pack xmml, xmml, xmmh, ext=1, srcSize=2, destSize=1
+    pack xmmh, ufp1, ufp2, ext=1, srcSize=2, destSize=1
+};
+
+def macroop PACKUSWB_XMM_XMM {
+    pack ufp1, xmml, xmmh, ext=0, srcSize=2, destSize=1
+    pack xmmh, xmmlm, xmmhm, ext=0, srcSize=2, destSize=1
+    movfp xmml, ufp1, dataSize=8
+};
+
+def macroop PACKUSWB_XMM_M {
+    ldfp ufp1, seg, sib, "DISPLACEMENT", dataSize=8
+    ldfp ufp2, seg, sib, "DISPLACEMENT + 8", dataSize=8
+    pack xmml, xmml, xmmh, ext=0, srcSize=2, destSize=1
+    pack xmmh, ufp1, ufp2, ext=0, srcSize=2, destSize=1
+};
+
+def macroop PACKUSWB_XMM_P {
+    rdip t7
+    ldfp ufp1, seg, riprel, "DISPLACEMENT", dataSize=8
+    ldfp ufp2, seg, riprel, "DISPLACEMENT + 8", dataSize=8
+    pack xmml, xmml, xmmh, ext=0, srcSize=2, destSize=1
+    pack xmmh, ufp1, ufp2, ext=0, srcSize=2, destSize=1
+};
 '''
diff --git a/src/arch/x86/isa/insts/simd64/integer/data_reordering/pack_with_saturation.py b/src/arch/x86/isa/insts/simd64/integer/data_reordering/pack_with_saturation.py
index 859d2bc7e..4235d7f26 100644
--- a/src/arch/x86/isa/insts/simd64/integer/data_reordering/pack_with_saturation.py
+++ b/src/arch/x86/isa/insts/simd64/integer/data_reordering/pack_with_saturation.py
@@ -54,7 +54,48 @@
 # Authors: Gabe Black
 
 microcode = '''
-# PACKSSDW
-# PACKSSWB
-# PACKUSWB
+def macroop PACKSSDW_MMX_MMX {
+    pack mmx, mmx, mmxm, ext=1, srcSize=4, destSize=2
+};
+
+def macroop PACKSSDW_MMX_M {
+    ldfp ufp1, seg, sib, disp, dataSize=8
+    pack mmx, mmx, ufp1, ext=1, srcSize=4, destSize=2
+};
+
+def macroop PACKSSDW_MMX_P {
+    rdip t7
+    ldfp ufp1, seg, riprel, disp, dataSize=8
+    pack mmx, mmx, ufp1, ext=1, srcSize=4, destSize=2
+};
+
+def macroop PACKSSWB_MMX_MMX {
+    pack mmx, mmx, mmxm, ext=1, srcSize=2, destSize=1
+};
+
+def macroop PACKSSWB_MMX_M {
+    ldfp ufp1, seg, sib, disp, dataSize=8
+    pack mmx, mmx, ufp1, ext=1, srcSize=2, destSize=1
+};
+
+def macroop PACKSSWB_MMX_P {
+    rdip t7
+    ldfp ufp1, seg, riprel, disp, dataSize=8
+    pack mmx, mmx, ufp1, ext=1, srcSize=2, destSize=1
+};
+
+def macroop PACKUSWB_MMX_MMX {
+    pack mmx, mmx, mmxm, ext=0, srcSize=2, destSize=1
+};
+
+def macroop PACKUSWB_MMX_M {
+    ldfp ufp1, seg, sib, disp, dataSize=8
+    pack mmx, mmx, ufp1, ext=0, srcSize=2, destSize=1
+};
+
+def macroop PACKUSWB_MMX_P {
+    rdip t7
+    ldfp ufp1, seg, riprel, disp, dataSize=8
+    pack mmx, mmx, ufp1, ext=0, srcSize=2, destSize=1
+};
 '''