Use vISA_setFFID to overwrite FFID when necessary

Change-Id: I280ad152b64ce4256c53a1fd50f7f3f05d4332c4

Author: davidjwoo

IGC/Compiler/CISACodeGen/CISABuilder.cpp

@@ -3725,6 +3725,21 @@ namespace IGC
         SaveOption(vISA_DumpCompilerStats, true);
     }
 
+    if (IGC_IS_FLAG_ENABLED(ForceFFIDOverwrite) && m_program->m_Platform->WaOverwriteFFID())
+    {
+        static const unsigned int ffid[unsigned(ShaderType::END)] = {
+            0,
+            FFID_VS,
+            FFID_HS,
+            FFID_DS,
+            FFID_GS,
+            FFID_PS,
+            FFID_GP,
+            FFID_GP
+        };
+        SaveOption(vISA_setFFID, ffid[unsigned(context->type)]);
+    }
+
     if (context->type == ShaderType::OPENCL_SHADER && context->m_floatDenormMode32 == FLOAT_DENORM_RETAIN &&
         context->m_floatDenormMode64 == FLOAT_DENORM_RETAIN)
     {
@@ -4906,6 +4921,8 @@ namespace IGC
     pOutput->m_scratchSpaceUsedByGtpin = jitInfo->numBytesScratchGtpin;
 
     pOutput->m_offsetToSkipPerThreadDataLoad = jitInfo->offsetToSkipPerThreadDataLoad;
+
+    pOutput->m_offsetToSkipSetFFIDGP = jitInfo->offsetToSkipSetFFIDGP;
     }
 
     void CEncoder::DestroyVISABuilder()

IGC/Compiler/CISACodeGen/Platform.hpp

@@ -450,6 +450,11 @@ namespace IGC
         return m_WaTable.Wa_1805992985 != 0;
     }
 
+    bool WaOverwriteFFID() const
+    {
+        return m_WaTable.Wa_1409460247 != 0;
+    }
+
     bool alignBindlessSampler() const
     {
         return IGC_IS_FLAG_ENABLED(Use16ByteBindlessSampler) &&

IGC/Compiler/CodeGenPublic.h

@@ -110,6 +110,7 @@ namespace IGC
         unsigned int    m_funcRelocationTableSize;
         unsigned int    m_funcRelocationTableEntries;
         unsigned int    m_offsetToSkipPerThreadDataLoad = 0;
+        uint32_t        m_offsetToSkipSetFFIDGP = 0;
         //true means we separate pvtmem and spillfill. pvtmem could go into stateless.
         //false means all of them are together
         bool            m_separatePvtSpill = false;

IGC/common/igc_flags.def

@@ -277,6 +277,7 @@ DECLARE_IGC_REGKEY(bool, EnableAdvMemOpt,               true,  "Enable advanced
 DECLARE_IGC_REGKEY(bool, UniformMemOptLimit,            0,     "Limit of uniform memory optimization in bits", false)
 DECLARE_IGC_REGKEY(bool, EnableFunctionPointer,         true,  "Enables support for function pointers and indirect calls", false)
 DECLARE_IGC_REGKEY(bool, EnableIndirectCallOptimization, false, "Enables inlining indirect calls by comparing function addresses", false)
+DECLARE_IGC_REGKEY(bool, ForceFFIDOverwrite,            false,   "Force overwriting ffid in sr0.0", false)
 
 DECLARE_IGC_REGKEY(bool, EnableReadGTPinInput,          true,  "Enables setting GTPin context flags by reading the input to the compiler adapters", false)