X86: Implement the versions of MOVD that have an MMX destination.

src/arch/x86/isa/decoder/two_byte_opcodes.isa

@@ -580,7 +580,7 @@
                     0x1: punpckhwd_Pq_Qq();
                     0x2: punpckhdq_Pq_Qq();
                     0x3: packssdw_Pq_Qq();
-                    0x6: movd_Pq_Ed();
+                    0x6: Inst::MOVD(Pq,Edp);
                     0x7: movq_Pq_Qq();
                     default: Inst::UD2();
                 }

src/arch/x86/isa/insts/simd128/integer/data_transfer/move.py

@@ -54,11 +54,22 @@
 # Authors: Gabe Black
 
 microcode = '''
-# MOVD
+def macroop MOVD_MMX_R {
+    mov2fp mmx, regm, srcSize=dsz, destSize=8
+};
+
+def macroop MOVD_MMX_M {
+    ldfp mmx, seg, sib, disp, dataSize=8
+};
+
+def macroop MOVD_MMX_P {
+    rdip t7
+    ldfp mmx, seg, riprel, disp, dataSize=8
+};
+'''
 # MOVQ
 # MOVDQA
 # MOVDQU
 # MOVDQ2Q
 # MOVQ2DQ
 # LDDQU
-'''