Enable accumulator usage for sel instruction.

Author: weiyu-chen

visa/AccSubstitution.cpp

@@ -441,7 +441,7 @@ bool AccSubPass::isAccCandidate(G4_INST* inst, int& lastUse, bool& mustBeAcc0, i
         return false;
     }
 
-    if (inst->getCondMod())
+    if (inst->hasCondModWithFlag())
     {
         // since our du-chain is on inst instead of operand, the presence of conditional modifier complicates the checks later.
         // This is somewhat conservative but shouldn't matter too much as inst with both dst and conditional modifiers are rare.

visa/Gen4_IR.hpp

@@ -918,13 +918,16 @@ typedef struct _SWSBInfo
     //      add  (8|M8) ...
     // will have 0xFF00, which lane 8-15
     uint32_t getExecLaneMask() const;
-    G4_ExecSize getExecSize() const {return execSize;}
-    const G4_CondMod*    getCondMod() const {return mod;}
-          G4_CondMod*    getCondMod()       {return mod;}
-    const G4_VarBase*    getCondModBase() const;
-          G4_VarBase*    getCondModBase() {
-              return const_cast<G4_VarBase*>(((const G4_INST*)this)->getCondModBase());
-          }
+    G4_ExecSize getExecSize() const { return execSize; }
+
+    const G4_CondMod* getCondMod() const { return mod; }
+    G4_CondMod* getCondMod() { return mod; }
+    const G4_VarBase* getCondModBase() const;
+    G4_VarBase* getCondModBase() {
+        return const_cast<G4_VarBase*>(((const G4_INST*)this)->getCondModBase());
+    }
+    bool hasCondModWithFlag() const;
+
     void setCondMod(G4_CondMod* m);
 
     bool isDead() const {return dead;}
@@ -4205,6 +4208,11 @@ inline G4_Declare *G4_Operand::getBaseRegVarRootDeclare() const
     return getBase()->asRegVar()->getDeclare()->getRootDeclare();
 }
 
+inline bool G4_INST::hasCondModWithFlag() const
+{
+    return mod && mod->getBase();
+}
+
 } // namespace vISA
 
 #endif