Separate the concept of 16-bit/32-bit operand size controlled by 0x66 prefix and the current mode from the concept of SSE instructions using 0x66 prefix as part of their encoding without being affected by the mode.

This should allow SSE instructions to be encoded correctly in 16-bit mode which r198586 probably broke.

llvm-svn: 199193

1 files changed, 36 insertions, 17 deletions

diff --git a/llvm/utils/TableGen/X86RecognizableInstr.cpp b/llvm/utils/TableGen/X86RecognizableInstr.cpp
index ab97a5f5433..b88cc529ab8 100644
--- a/llvm/utils/TableGen/X86RecognizableInstr.cpp
+++ b/llvm/utils/TableGen/X86RecognizableInstr.cpp
@@ -80,7 +80,7 @@ namespace X86Local {
     XD = 11,  XS = 12,
     T8 = 13,  P_TA = 14,
     A6 = 15,  A7 = 16, T8XD = 17, T8XS = 18, TAXD = 19,
-    XOP8 = 20, XOP9 = 21, XOPA = 22
+    XOP8 = 20, XOP9 = 21, XOPA = 22, PD = 23, T8PD = 24, TAPD = 25,
   };
 }
 
@@ -254,7 +254,9 @@ RecognizableInstr::RecognizableInstr(DisassemblerTables &tables,
 
   Operands = &insn.Operands.OperandList;
 
-  IsSSE            = (HasOpSizePrefix && (Name.find("16") == Name.npos)) ||
+  IsSSE            = ((HasOpSizePrefix || Prefix == X86Local::PD ||
+                       Prefix == X86Local::T8PD || Prefix == X86Local::TAPD) &&
+                      (Name.find("16") == Name.npos)) ||
                      (Name.find("CRC32") != Name.npos);
   HasVEX_LPrefix   = Rec->getValueAsBit("hasVEX_L");
 
@@ -309,7 +311,7 @@ InstructionContext RecognizableInstr::insnContext() const {
     }
     // VEX_L & VEX_W
     if (HasVEX_LPrefix && HasVEX_WPrefix) {
-      if (HasOpSizePrefix)
+      if (HasOpSizePrefix || Prefix == X86Local::PD)
         insnContext = EVEX_KB(IC_EVEX_L_W_OPSIZE);
       else if (Prefix == X86Local::XS || Prefix == X86Local::T8XS)
         insnContext = EVEX_KB(IC_EVEX_L_W_XS);
@@ -320,7 +322,8 @@ InstructionContext RecognizableInstr::insnContext() const {
         insnContext = EVEX_KB(IC_EVEX_L_W);
     } else if (HasVEX_LPrefix) {
       // VEX_L
-      if (HasOpSizePrefix)
+      if (HasOpSizePrefix || Prefix == X86Local::PD ||
+          Prefix == X86Local::T8PD || Prefix == X86Local::TAPD)
         insnContext = EVEX_KB(IC_EVEX_L_OPSIZE);
       else if (Prefix == X86Local::XS || Prefix == X86Local::T8XS)
         insnContext = EVEX_KB(IC_EVEX_L_XS);
@@ -332,7 +335,8 @@ InstructionContext RecognizableInstr::insnContext() const {
     }
     else if (HasEVEX_L2Prefix && HasVEX_WPrefix) {
       // EVEX_L2 & VEX_W
-      if (HasOpSizePrefix)
+      if (HasOpSizePrefix || Prefix == X86Local::PD ||
+          Prefix == X86Local::T8PD || Prefix == X86Local::TAPD)
         insnContext = EVEX_KB(IC_EVEX_L2_W_OPSIZE);
       else if (Prefix == X86Local::XS || Prefix == X86Local::T8XS)
         insnContext = EVEX_KB(IC_EVEX_L2_W_XS);
@@ -343,10 +347,11 @@ InstructionContext RecognizableInstr::insnContext() const {
         insnContext = EVEX_KB(IC_EVEX_L2_W);
     } else if (HasEVEX_L2Prefix) {
       // EVEX_L2
-      if (HasOpSizePrefix)
+      if (HasOpSizePrefix || Prefix == X86Local::PD ||
+          Prefix == X86Local::T8PD || Prefix == X86Local::TAPD)
         insnContext = EVEX_KB(IC_EVEX_L2_OPSIZE);
       else if (Prefix == X86Local::XD || Prefix == X86Local::T8XD ||
-          Prefix == X86Local::TAXD)
+               Prefix == X86Local::TAXD)
         insnContext = EVEX_KB(IC_EVEX_L2_XD);
       else if (Prefix == X86Local::XS || Prefix == X86Local::T8XS)
         insnContext = EVEX_KB(IC_EVEX_L2_XS);
@@ -355,7 +360,8 @@ InstructionContext RecognizableInstr::insnContext() const {
     }
     else if (HasVEX_WPrefix) {
       // VEX_W
-      if (HasOpSizePrefix)
+      if (HasOpSizePrefix || Prefix == X86Local::PD ||
+          Prefix == X86Local::T8PD || Prefix == X86Local::TAPD)
         insnContext = EVEX_KB(IC_EVEX_W_OPSIZE);
       else if (Prefix == X86Local::XS || Prefix == X86Local::T8XS)
         insnContext = EVEX_KB(IC_EVEX_W_XS);
@@ -366,7 +372,8 @@ InstructionContext RecognizableInstr::insnContext() const {
         insnContext = EVEX_KB(IC_EVEX_W);
     }
     // No L, no W
-    else if (HasOpSizePrefix)
+    else if (HasOpSizePrefix || Prefix == X86Local::PD ||
+          Prefix == X86Local::T8PD || Prefix == X86Local::TAPD)
       insnContext = EVEX_KB(IC_EVEX_OPSIZE);
     else if (Prefix == X86Local::XD || Prefix == X86Local::T8XD ||
              Prefix == X86Local::TAXD)
@@ -378,7 +385,8 @@ InstructionContext RecognizableInstr::insnContext() const {
     /// eof EVEX
   } else if (HasVEX_4VPrefix || HasVEX_4VOp3Prefix|| HasVEXPrefix) {
     if (HasVEX_LPrefix && HasVEX_WPrefix) {
-      if (HasOpSizePrefix)
+      if (HasOpSizePrefix || Prefix == X86Local::PD ||
+          Prefix == X86Local::T8PD || Prefix == X86Local::TAPD)
         insnContext = IC_VEX_L_W_OPSIZE;
       else if (Prefix == X86Local::XS || Prefix == X86Local::T8XS)
         insnContext = IC_VEX_L_W_XS;
@@ -387,11 +395,16 @@ InstructionContext RecognizableInstr::insnContext() const {
         insnContext = IC_VEX_L_W_XD;
       else
         insnContext = IC_VEX_L_W;
-    } else if (HasOpSizePrefix && HasVEX_LPrefix)
+    } else if ((HasOpSizePrefix || Prefix == X86Local::PD ||
+                Prefix == X86Local::T8PD || Prefix == X86Local::TAPD) &&
+               HasVEX_LPrefix)
       insnContext = IC_VEX_L_OPSIZE;
-    else if (HasOpSizePrefix && HasVEX_WPrefix)
+    else if ((HasOpSizePrefix || Prefix == X86Local::PD ||
+              Prefix == X86Local::T8PD || Prefix == X86Local::TAPD) &&
+             HasVEX_WPrefix)
       insnContext = IC_VEX_W_OPSIZE;
-    else if (HasOpSizePrefix)
+    else if (HasOpSizePrefix || Prefix == X86Local::PD ||
+             Prefix == X86Local::T8PD || Prefix == X86Local::TAPD)
       insnContext = IC_VEX_OPSIZE;
     else if (HasVEX_LPrefix &&
              (Prefix == X86Local::XS || Prefix == X86Local::T8XS))
@@ -419,7 +432,8 @@ InstructionContext RecognizableInstr::insnContext() const {
     else
       insnContext = IC_VEX;
   } else if (Is64Bit || HasREX_WPrefix) {
-    if (HasREX_WPrefix && HasOpSizePrefix)
+    if (HasREX_WPrefix && (HasOpSizePrefix || Prefix == X86Local::PD ||
+                           Prefix == X86Local::T8PD || Prefix == X86Local::TAPD))
       insnContext = IC_64BIT_REXW_OPSIZE;
     else if (HasOpSizePrefix && (Prefix == X86Local::XD ||
                                  Prefix == X86Local::T8XD ||
@@ -428,7 +442,8 @@ InstructionContext RecognizableInstr::insnContext() const {
     else if (HasOpSizePrefix &&
              (Prefix == X86Local::XS || Prefix == X86Local::T8XS))
       insnContext = IC_64BIT_XS_OPSIZE;
-    else if (HasOpSizePrefix)
+    else if (HasOpSizePrefix || Prefix == X86Local::PD ||
+             Prefix == X86Local::T8PD || Prefix == X86Local::TAPD)
       insnContext = IC_64BIT_OPSIZE;
     else if (HasAdSizePrefix)
       insnContext = IC_64BIT_ADSIZE;
@@ -458,7 +473,8 @@ InstructionContext RecognizableInstr::insnContext() const {
       insnContext = IC_XS_OPSIZE;
     else if (HasOpSizePrefix && HasAdSizePrefix)
       insnContext = IC_OPSIZE_ADSIZE;
-    else if (HasOpSizePrefix)
+    else if (HasOpSizePrefix || Prefix == X86Local::PD ||
+             Prefix == X86Local::T8PD || Prefix == X86Local::TAPD)
       insnContext = IC_OPSIZE;
     else if (HasAdSizePrefix)
       insnContext = IC_ADSIZE;
@@ -851,7 +867,8 @@ void RecognizableInstr::emitDecodePath(DisassemblerTables &tables) const {
 
   switch (Prefix) {
   default: llvm_unreachable("Invalid prefix!");
-  // Extended two-byte opcodes can start with f2 0f, f3 0f, or 0f
+  // Extended two-byte opcodes can start with 66 0f, f2 0f, f3 0f, or 0f
+  case X86Local::PD:
   case X86Local::XD:
   case X86Local::XS:
   case X86Local::TB:
@@ -897,6 +914,7 @@ void RecognizableInstr::emitDecodePath(DisassemblerTables &tables) const {
     opcodeToSet = Opcode;
     break;
   case X86Local::T8:
+  case X86Local::T8PD:
   case X86Local::T8XD:
   case X86Local::T8XS:
     opcodeType = THREEBYTE_38;
@@ -940,6 +958,7 @@ void RecognizableInstr::emitDecodePath(DisassemblerTables &tables) const {
     opcodeToSet = Opcode;
     break;
   case X86Local::P_TA:
+  case X86Local::TAPD:
   case X86Local::TAXD:
     opcodeType = THREEBYTE_3A;
     if (needsModRMForDecode(Form))