[X86] Remove the single AdSize indicator and replace it with separate AdSize16/32...

[oota-llvm.git] / lib / Target / X86 / MCTargetDesc / X86BaseInfo.h

diff --git a/lib/Target/X86/MCTargetDesc/X86BaseInfo.h b/lib/Target/X86/MCTargetDesc/X86BaseInfo.h
index 365cf0ce156a7fec97ac327b2bd1da6015ea9f01..5915d119307cd4fe3ed004016fff02cf3d9c9b79 100644 (file)
--- a/lib/Target/X86/MCTargetDesc/X86BaseInfo.h
+++ b/lib/Target/X86/MCTargetDesc/X86BaseInfo.h
@@ -328,21 +328,28 @@ namespace X86II {
     OpSizeShift = 7,
     OpSizeMask = 0x3 << OpSizeShift,
 
-    OpSize16 = 1 << OpSizeShift,
-    OpSize32 = 2 << OpSizeShift,
-
-    // AsSize - Set if this instruction requires an operand size prefix (0x67),
-    // which most often indicates that the instruction address 16 bit address
-    // instead of 32 bit address (or 32 bit address in 64 bit mode).
+    OpSizeFixed = 0 << OpSizeShift,
+    OpSize16    = 1 << OpSizeShift,
+    OpSize32    = 2 << OpSizeShift,
+
+    // AsSize - AdSizeX implies this instruction determines its need of 0x67
+    // prefix from a normal ModRM memory operand. The other types indicate that
+    // an operand is encoded with a specific width and a prefix is needed if
+    // it differs from the current mode.
     AdSizeShift = OpSizeShift + 2,
-    AdSize      = 1 << AdSizeShift,
+    AdSizeMask  = 0x3 << AdSizeShift,
+
+    AdSizeX  = 1 << AdSizeShift,
+    AdSize16 = 1 << AdSizeShift,
+    AdSize32 = 2 << AdSizeShift,
+    AdSize64 = 3 << AdSizeShift,
 
     //===------------------------------------------------------------------===//
     // OpPrefix - There are several prefix bytes that are used as opcode
     // extensions. These are 0x66, 0xF3, and 0xF2. If this field is 0 there is
     // no prefix.
     //
-    OpPrefixShift = AdSizeShift + 1,
+    OpPrefixShift = AdSizeShift + 2,
     OpPrefixMask  = 0x7 << OpPrefixShift,
 
     // PS, PD - Prefix code for packed single and double precision vector
@@ -759,7 +766,7 @@ namespace X86II {
             (RegNo > X86::ZMM15 && RegNo <= X86::ZMM31));
   }
 
-  
+
   inline bool isX86_64NonExtLowByteReg(unsigned reg) {
     return (reg == X86::SPL || reg == X86::BPL ||
             reg == X86::SIL || reg == X86::DIL);