From f64f9a4b75d07819866bfcf918b922a76d3e1600 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Wed, 15 Nov 2006 23:23:02 +0000
Subject: Remove the isTwoAddress property from the CodeGenInstruction class. 
 It should not be used for anything other than backwards compat constraint
 handling.

Add support for a new DisableEncoding property which contains a list of
registers that should not be encoded by the generated code emitter.  Convert
the codeemitter generator to use this, fixing some PPC JIT regressions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31769 91177308-0d34-0410-b5e6-96231b3b80d8
---
 utils/TableGen/CodeGenInstruction.h | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

(limited to 'utils/TableGen/CodeGenInstruction.h')

diff --git a/utils/TableGen/CodeGenInstruction.h b/utils/TableGen/CodeGenInstruction.h
index d99af1b67a..e0d6b9837e 100644
--- a/utils/TableGen/CodeGenInstruction.h
+++ b/utils/TableGen/CodeGenInstruction.h
@@ -57,6 +57,11 @@ namespace llvm {
       unsigned MIOperandNo;
       unsigned MINumOperands;   // The number of operands.
 
+      /// DoNotEncode - Bools are set to true in this vector for each operand in
+      /// the DisableEncoding list.  These should not be emitted by the code
+      /// emitter.
+      std::vector<bool> DoNotEncode;
+      
       /// MIOperandInfo - Default MI operand type. Note an operand may be made
       /// up of multiple MI operands.
       DagInit *MIOperandInfo;
@@ -82,7 +87,6 @@ namespace llvm {
     bool isCall;
     bool isLoad;
     bool isStore;
-    bool isTwoAddress;
     bool isPredicated;
     bool isConvertibleToThreeAddress;
     bool isCommutable;
@@ -107,6 +111,25 @@ namespace llvm {
       return OperandList[Op.first].MIOperandNo + Op.second;
     }
     
+    /// getSubOperandNumber - Unflatten a operand number into an
+    /// operand/suboperand pair.
+    std::pair<unsigned,unsigned> getSubOperandNumber(unsigned Op) const {
+      for (unsigned i = 0; ; ++i) {
+        assert(i < OperandList.size() && "Invalid flat operand #");
+        if (OperandList[i].MIOperandNo+OperandList[i].MINumOperands > Op)
+          return std::make_pair(i, Op-OperandList[i].MIOperandNo);
+      }
+    }
+    
+    
+    /// isFlatOperandNotEmitted - Return true if the specified flat operand #
+    /// should not be emitted with the code emitter.
+    bool isFlatOperandNotEmitted(unsigned FlatOpNo) const {
+      std::pair<unsigned,unsigned> Op = getSubOperandNumber(FlatOpNo);
+      if (OperandList[Op.first].DoNotEncode.size() > Op.second)
+        return OperandList[Op.first].DoNotEncode[Op.second];
+      return false;
+    }
 
     CodeGenInstruction(Record *R, const std::string &AsmStr);
 
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