From: Chris Lattner <sabre@nondot.org>
Date: Wed, 25 Dec 2002 05:09:59 +0000 (+0000)
Subject: Add FP instr prefix byte support
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=4c299f5da1013cd36563a82f188c731b2758074d;p=llvm

Add FP instr prefix byte support
Add Pseudo instr class


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5152 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/X86/X86InstrInfo.h b/lib/Target/X86/X86InstrInfo.h
index aa364f30156..def97757ce8 100644
--- a/lib/Target/X86/X86InstrInfo.h
+++ b/lib/Target/X86/X86InstrInfo.h
@@ -20,33 +20,38 @@ namespace X86II {
     // instructions.
     //
 
+    // PseudoFrm - This represents an instruction that is a pseudo instruction
+    // or one that has not been implemented yet.  It is illegal to code generate
+    // it, but tolerated for intermediate implementation stages.
+    Pseudo         = 0,
+
     /// Raw - This form is for instructions that don't have any operands, so
     /// they are just a fixed opcode value, like 'leave'.
-    RawFrm         = 0,
+    RawFrm         = 1,
     
     /// AddRegFrm - This form is used for instructions like 'push r32' that have
     /// their one register operand added to their opcode.
-    AddRegFrm      = 1,
+    AddRegFrm      = 2,
 
     /// MRMDestReg - This form is used for instructions that use the Mod/RM byte
     /// to specify a destination, which in this case is a register.
     ///
-    MRMDestReg     = 2,
+    MRMDestReg     = 3,
 
     /// MRMDestMem - This form is used for instructions that use the Mod/RM byte
     /// to specify a destination, which in this case is memory.
     ///
-    MRMDestMem     = 3,
+    MRMDestMem     = 4,
 
     /// MRMSrcReg - This form is used for instructions that use the Mod/RM byte
     /// to specify a source, which in this case is a register.
     ///
-    MRMSrcReg      = 4,
+    MRMSrcReg      = 5,
 
     /// MRMSrcMem - This form is used for instructions that use the Mod/RM byte
     /// to specify a source, which in this case is memory.
     ///
-    MRMSrcMem      = 5,
+    MRMSrcMem      = 6,
   
     /// MRMS[0-7][rm] - These forms are used to represent instructions that use
     /// a Mod/RM byte, and use the middle field to hold extended opcode
@@ -69,28 +74,38 @@ namespace X86II {
     /// Void - Set if this instruction produces no value
     Void        = 1 << 5,
 
-    // TB - TwoByte - Set if this instruction has a two byte opcode, which
-    // starts with a 0x0F byte before the real opcode.
-    TB          = 1 << 6,
-
-    // FIXME: There are several more two byte opcode escapes: D8-DF
-    // Handle this.
-
     // OpSize - Set if this instruction requires an operand size prefix (0x66),
     // which most often indicates that the instruction operates on 16 bit data
     // instead of 32 bit data.
-    OpSize      = 1 << 7,
-
-    // This three-bit field describes the size of a memory operand.
-    // I'm just being paranoid not using the zero value; there's 
-    // probably no reason you couldn't use it.
-    Arg8     = 0x1 << 8,
-    Arg16    = 0x2 << 8,
-    Arg32    = 0x3 << 8,
-    Arg64    = 0x4 << 8,
-    Arg80    = 0x5 << 8,
-    Arg128   = 0x6 << 8,
-    ArgMask  = 0x7 << 8,
+    OpSize      = 1 << 6,
+
+    // Op0Mask - There are several prefix bytes that are used to form two byte
+    // opcodes.  These are currently 0x0F, and 0xD8-0xDF.  This mask is used to
+    // obtain the setting of this field.  If no bits in this field is set, there
+    // is no prefix byte for obtaining a multibyte opcode.
+    //
+    Op0Mask     = 0xF << 7,
+
+    // TB - TwoByte - Set if this instruction has a two byte opcode, which
+    // starts with a 0x0F byte before the real opcode.
+    TB          = 1 << 7,
+
+    // D8-DF - These escape opcodes are used by the floating point unit.  These
+    // values must remain sequential.
+    D8 = 2 << 7,   D9 = 3 << 7,   DA = 4 << 7,   DB = 5 << 7,
+    DC = 6 << 7,   DD = 7 << 7,   DE = 8 << 7,   DF = 9 << 7,
+
+    // This three-bit field describes the size of a memory operand.  Zero is
+    // unused so that we can tell if we forgot to set a value.
+    Arg8     = 1 << 11,
+    Arg16    = 2 << 11,
+    Arg32    = 3 << 11,
+    ArgF32   = 4 << 11,
+    ArgF64   = 5 << 11,
+    ArgF80   = 6 << 11,
+    ArgMask  = 7 << 11,
+
+    // Bits 14 -> 31 are unused
   };
 }