limit max GRF if kernel is SIMD16

Limit max GRF if kernel is SIMD16.

Author: pkwasnie-intel

IGC/Compiler/CISACodeGen/CISABuilder.cpp

@@ -4603,6 +4603,13 @@ namespace IGC
                     SaveOption(vISA_AutoGRFSelection, true);
                 }
 
+                if (m_program->m_Platform->supportsAutoGRFSelection() &&
+                    m_program->m_Platform->getPlatformInfo().eProductFamily == IGFX_PVC &&
+                    m_program->m_dispatchSize == SIMDMode::SIMD16)
+                {
+                    SaveOption(vISA_MaxGRFNum, unsigned(128));
+                }
+
                 // Emit warnings if mismatch is found in user input
                 // Mismatch between number of threads and GRF size (per module)
                 if (ClContext->getNumThreadsPerEU() > 0 &&  ClContext->getExpGRFSize() > 0 &&