Add shader metadata for extra GRFs for latency scheduling

New metadata field to allow setting extra GRFs to be used for latency
scheduling.

Author: mmerecki

IGC/Compiler/CISACodeGen/CISABuilder.cpp

@@ -3622,6 +3622,9 @@ void CEncoder::InitVISABuilderOptions(TARGET_PLATFORM VISAPlatform, bool canAbor
 
     if (uint32_t Val = IGC_GET_FLAG_VALUE(VISAPreSchedExtraGRF)) {
       SaveOption(vISA_preRA_ScheduleExtraGRF, Val);
+    } else if (context->type == ShaderType::COMPUTE_SHADER &&
+               context->getModuleMetaData()->csInfo.VISAPreSchedScheduleExtraGRF > 0) {
+      SaveOption(vISA_preRA_ScheduleExtraGRF, context->getModuleMetaData()->csInfo.VISAPreSchedScheduleExtraGRF);
     }
 
     if (uint32_t Val = IGC_GET_FLAG_VALUE(VISAScheduleStartBBID)) {

IGC/common/MDFrameWork.h

@@ -537,6 +537,7 @@ enum class ShaderTypeMD
         unsigned int forceTotalGRFNum = 0; // 0 means not forced
         unsigned int VISAPreSchedRPThreshold = 0; // 0 means use the default
         unsigned int VISAPreSchedCtrl = 0; // 0 means use the default
+        unsigned int VISAPreSchedScheduleExtraGRF = 0; // additional GRF for latency scheduling
         unsigned int SetLoopUnrollThreshold = 0; // 0 means use the default
         bool forceSpillCompression = false;
         bool allowLowerSimd = false;