Changeset 65772 in vbox for trunk/src/VBox

Timestamp:

Feb 13, 2017 3:28:22 PM (8 years ago)

Author:

vboxsync

Message:

IEM: Use jump table for group 7 memory variants.

File:

• trunk/src/VBox/VMM/VMMAll/IEMAllInstructionsTwoByte0f.cpp.h (modified) (5 diffs)

trunk/src/VBox/VMM/VMMAll/IEMAllInstructionsTwoByte0f.cpp.h

@@ -597 +597 @@
 
 
+/**
+ * Group 7 jump table, memory variant.
+ */
+IEM_STATIC const PFNIEMOPRM g_apfnGroup7Mem[8] =
+{
+    iemOp_Grp7_sgdt,
+    iemOp_Grp7_sidt,
+    iemOp_Grp7_lgdt,
+    iemOp_Grp7_lidt,
+    iemOp_Grp7_smsw,
+    iemOp_InvalidWithRM,
+    iemOp_Grp7_lmsw,
+    iemOp_Grp7_invlpg
+};
+
+
 /** Opcode 0x0f 0x01. */
 FNIEMOP_DEF(iemOp_Grp7)
 {
     uint8_t bRm; IEM_OPCODE_GET_NEXT_U8(&bRm);
+    if ((bRm & X86_MODRM_MOD_MASK) != (3 << X86_MODRM_MOD_SHIFT))
+        return FNIEMOP_CALL_1(g_apfnGroup7Mem[(bRm >> X86_MODRM_REG_SHIFT) & X86_MODRM_REG_SMASK], bRm);
+
     switch ((bRm >> X86_MODRM_REG_SHIFT) & X86_MODRM_REG_SMASK)
     {
         case 0:
-            if ((bRm & X86_MODRM_MOD_MASK) != (3 << X86_MODRM_MOD_SHIFT))
-                return FNIEMOP_CALL_1(iemOp_Grp7_sgdt, bRm);
             switch (bRm & X86_MODRM_RM_MASK)
             {
@@ -616 +633 @@
 
         case 1:
-            if ((bRm & X86_MODRM_MOD_MASK) != (3 << X86_MODRM_MOD_SHIFT))
-                return FNIEMOP_CALL_1(iemOp_Grp7_sidt, bRm);
             switch (bRm & X86_MODRM_RM_MASK)
             {
@@ -626 +641 @@
 
         case 2:
-            if ((bRm & X86_MODRM_MOD_MASK) != (3 << X86_MODRM_MOD_SHIFT))
-                return FNIEMOP_CALL_1(iemOp_Grp7_lgdt, bRm);
             switch (bRm & X86_MODRM_RM_MASK)
             {
@@ -636 +649 @@
 
         case 3:
-            if ((bRm & X86_MODRM_MOD_MASK) != (3 << X86_MODRM_MOD_SHIFT))
-                return FNIEMOP_CALL_1(iemOp_Grp7_lidt, bRm);
             switch (bRm & X86_MODRM_RM_MASK)
             {
@@ -661 +672 @@
 
         case 7:
-            if ((bRm & X86_MODRM_MOD_MASK) != (3 << X86_MODRM_MOD_SHIFT))
-                return FNIEMOP_CALL_1(iemOp_Grp7_invlpg, bRm);
             switch (bRm & X86_MODRM_RM_MASK)
             {