X86: Implement the instructions that compare fp values and write to rflags.

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

@@ -379,8 +379,8 @@
                     0x3: movntps_Mo_Vo();
                     0x4: cvttps2pi_Pq_Wq();
                     0x5: cvtpS2pi_Pq_Wq();
-                    0x6: ucomiss_Vd_Wd();
-                    0x7: comiss_Vd_Wd();
+                    0x6: Inst::UCOMISS(Vd,Wd);
+                    0x7: Inst::COMISS(Vd,Wd);
                 }
                 // repe (0xF3)
                 0x4: decode OPCODE_OP_BOTTOM3 {
@@ -398,7 +398,7 @@
                     0x4: cvttpd2pi_Pq_Wo();
                     0x5: cvtpd2pi_Pq_Wo();
                     0x6: Inst::UCOMISD(Vq,Wq);
-                    0x7: comisd_Vq_Wq();
+                    0x7: Inst::COMISD(Vq,Wq);
                 }
                 // repne (0xF2)
                 0x8: decode OPCODE_OP_BOTTOM3 {

src/arch/x86/isa/insts/simd128/floating_point/compare/compare_and_write_rflags.py

@@ -54,22 +54,63 @@
 # Authors: Gabe Black
 
 microcode = '''
-# COMISS
-# COMISD
-# UCOMISS
+def macroop UCOMISS_XMM_XMM {
+    mcmpf2rf xmml, xmmlm, size=4
+};
+
+def macroop UCOMISS_XMM_M {
+    ldfp ufp1, seg, sib, disp, dataSize=8
+    mcmpf2rf xmml, ufp1, size=4
+};
+
+def macroop UCOMISS_XMM_P {
+    rdip t7
+    ldfp ufp1, seg, riprel, disp, dataSize=8
+    mcmpf2rf xmml, ufp1, size=4
+};
 
 def macroop UCOMISD_XMM_XMM {
-    compfp xmml, xmmlm
+    mcmpf2rf xmml, xmmlm, size=8
 };
 
 def macroop UCOMISD_XMM_M {
     ldfp ufp1, seg, sib, disp, dataSize=8
-    compfp xmml, ufp1
+    mcmpf2rf xmml, ufp1, size=8
 };
 
 def macroop UCOMISD_XMM_P {
     rdip t7
     ldfp ufp1, seg, riprel, disp, dataSize=8
-    compfp xmml, ufp1
+    mcmpf2rf xmml, ufp1, size=8
+};
+
+def macroop COMISS_XMM_XMM {
+    mcmpf2rf xmml, xmmlm, size=4
+};
+
+def macroop COMISS_XMM_M {
+    ldfp ufp1, seg, sib, disp, dataSize=8
+    mcmpf2rf xmml, ufp1, size=4
+};
+
+def macroop COMISS_XMM_P {
+    rdip t7
+    ldfp ufp1, seg, riprel, disp, dataSize=8
+    mcmpf2rf xmml, ufp1, size=4
+};
+
+def macroop COMISD_XMM_XMM {
+    mcmpf2rf xmml, xmmlm, size=8
+};
+
+def macroop COMISD_XMM_M {
+    ldfp ufp1, seg, sib, disp, dataSize=8
+    mcmpf2rf xmml, ufp1, size=8
+};
+
+def macroop COMISD_XMM_P {
+    rdip t7
+    ldfp ufp1, seg, riprel, disp, dataSize=8
+    mcmpf2rf xmml, ufp1, size=8
 };
 '''