Reset acc0 to 0 before EOT

Change-Id: Ibceee8066647b1ba80ac6427ad00b96af0fa4bef

Author: DianaChen

visa/HWCapsOpen.inc

@@ -546,4 +546,9 @@
     {
         return getGenxPlatform() >= GENX_TGLLP;
     }
+
+    bool needResetAcc0beforeEOT() const
+    {
+        return getGenxPlatform() == GENX_TGLLP;
+    }
     // end HW capabilities

visa/Optimizer.cpp

@@ -6982,6 +6982,14 @@ void Optimizer::evenlySplitInst(INST_LIST_ITER iter, G4_BB* bb)
                     bb->insert(ii, movInst);
                 }
 
+                if (inst->isEOT() && builder.needResetAcc0beforeEOT())
+                {
+                    // insert "(W) mov(16) acc0.0:f 0x0:f" before EOT
+                    G4_INST* movInst = builder.createMov(16,
+                        builder.createDstRegRegion(Direct, builder.phyregpool.getAcc0Reg(),0, 0, 1, Type_F),
+                        builder.createImm(0, Type_F), InstOpt_WriteEnable, false);
+                    bb->insert(ii, movInst);
+                }
 
                 if (VISA_WA_CHECK(builder.getPWaTable(), WaResetN0BeforeGatewayMessage) &&
                     inst->isSend() && inst->getMsgDesc()->isBarrierMsg())
@@ -7020,7 +7028,6 @@ void Optimizer::evenlySplitInst(INST_LIST_ITER iter, G4_BB* bb)
             // set A0 to tdr0 before sendc/sendsc. TGL WA
             setA0toTdrForSendc();
         }
-
     }
 
 class NSDS {