[Autobackout][FuncReg]Revert of change: 280b094

Enable A64 WA by default

Change-Id: I555d469adf70d3f369a0f7d46a445cd10b9b80c1

Author: DianaChen

IGC/Compiler/CISACodeGen/DriverInfo.hpp

@@ -271,9 +271,6 @@ namespace IGC
         /// Check for flush to zero for DP emulated function
         virtual bool DPEmulationFlushToZero() const { return false; }
 
-        /// check if the API support A64 WA. Corresponding RegKey for A64 WA is EnableA64WA
-        virtual bool EnableA64WA() const { return true; }
-
 
 
     };

IGC/Compiler/CISACodeGen/EmitVISAPass.cpp

@@ -14417,9 +14417,7 @@ void EmitPass::A64LSLoopTail(CVariable* curMask, CVariable* lsPred, uint label)
 
 bool EmitPass::hasA64WAEnable() const
 {
-    // check if the WA is disable by compiler flag or if the API can't support it
-    if (m_pCtx->getModuleMetaData()->compOpt.DisableA64WA ||
-        (!m_pCtx->m_DriverInfo.EnableA64WA()))
+    if (m_pCtx->getModuleMetaData()->compOpt.DisableA64WA)
         return false;
     return m_currShader->m_Platform->WaEnableA64WA();
 }

IGC/common/igc_flags.def

@@ -376,7 +376,7 @@ DECLARE_IGC_REGKEY(bool, ForceNoFP64bRegioning, false, "force regioning rules fo
 DECLARE_IGC_REGKEY(bool, EnableOneStepElf, true, "Enable generation of direct elf mapping src->Gen ISA", false)
 DECLARE_IGC_REGKEY(bool, EmitDebugRanges, false, "Emit .debug_ranges section when instructions in a block are non-consecutive", false)
 DECLARE_IGC_REGKEY(bool, EmitDebugLoc, false, "Enable generation of .debug_loc section", false)
-DECLARE_IGC_REGKEY(bool, EnableA64WA, true, "Guarantee A64 load/store addres-hi is uniform", false)
+DECLARE_IGC_REGKEY(bool, EnableA64WA, false, "Guarantee A64 load/store addres-hi is uniform", false)
 
 DECLARE_IGC_GROUP("Generating precompiled headers")
 DECLARE_IGC_REGKEY(bool, ApplyConservativeRastWAHeader, true, "Apply WaConservativeRasterization for the platforms enabled", false)