Restore Subslice count calculation for Xe3

The number of SubSlices for given platform should be taken from
MaxSubSlicesSupported, not from the number of enabled SubSlices.
For fused configurations the indices of SubSlices are based on the
number of SubSlices before fusing. Therefore we need to allocate
the stack as if the platform was not fused.

Author: JaroszPiotr

IGC/AdaptorCommon/RayTracing/RTBuilder.cpp

@@ -1233,7 +1233,7 @@ std::pair<uint32_t, uint32_t> RTBuilder::getDualSubsliceIDBitsInSR0() const {
 // globalDSSID is the combined value of sliceID and dssID on slice.
 Value* RTBuilder::getGlobalDSSID()
 {
-    if (isChildOfXe2)
+    if (Ctx.platform.isCoreChildOf(IGFX_XE2_HPG_CORE))
     {
         if (Ctx.platform.supportsWMTPForShaderType(Ctx.type))
         {
@@ -1252,7 +1252,7 @@ Value* RTBuilder::getGlobalDSSID()
             {
                 return emitStateRegID(dssIDBits.first, sliceIDBits.second);
             }
-            else if (isChildOfXe3)
+            else if (Ctx.platform.isCoreChildOf(IGFX_XE3_CORE))
             {
                 Value* sliceID = emitStateRegID(sliceIDBits.first, sliceIDBits.second);
                 Value* dssID = emitStateRegID(dssIDBits.first, dssIDBits.second);

IGC/AdaptorCommon/RayTracing/RTBuilder.h

@@ -58,9 +58,6 @@ class RTBuilder : public IGCIRBuilder<>
     static constexpr char *PrintfFuncName = "printf";
 
 
-    bool isChildOfXe2 = false;
-    bool isChildOfXe3 = false;
-
     // Field for explicit GlobalBufferPtr - used on OpenCL path.
     Value* GlobalBufferPtr = nullptr;
     bool DisableRTGlobalsKnownValues = false;
@@ -76,37 +73,8 @@ class RTBuilder : public IGCIRBuilder<>
                 enabledSlices++;
             }
         }
-        isChildOfXe3 = Ctx.platform.isCoreChildOf(IGFX_XE3_CORE);
-        isChildOfXe2 = Ctx.platform.isCoreChildOf(IGFX_XE2_HPG_CORE);
-
-        if (isChildOfXe3)
-        {
-            EuCountPerDSS = SysInfo.MaxEuPerSubSlice;
-            MaxDualSubSlicesSupported = 0;
-
-            IGC_ASSERT(NumDSSPerSlice <= GT_MAX_SUBSLICE_PER_SLICE);
 
-            for (unsigned int sliceID = 0; sliceID < GT_MAX_SLICE; ++sliceID)
-            {
-                if (SysInfo.SliceInfo[sliceID].Enabled)
-                {
-                    NumDSSPerSlice = SysInfo.SliceInfo[sliceID].SubSliceEnabledCount;
-
-                    // SubSliceInfo size is GT_MAX_SUBSLICE_PER_SLICE, but
-                    // actual number, calculated for given platform, of SubSlices is used
-                    // to iterate only through SubSlices present on the platform.
-                    for (unsigned int ssID = 0; ssID < NumDSSPerSlice; ++ssID)
-                    {
-                        if (SysInfo.SliceInfo[sliceID].SubSliceInfo[ssID].Enabled)
-                        {
-                            MaxDualSubSlicesSupported = std::max(MaxDualSubSlicesSupported, (sliceID * NumDSSPerSlice) + ssID + 1);
-                        }
-                    }
-                }
-            }
-        }
-        else // this will chain into if from Xe2 branch forming else if
-        if (isChildOfXe2 || Ctx.platform.isProductChildOf(IGFX_PVC))
+        if (Ctx.platform.isCoreChildOf(IGFX_XE2_HPG_CORE) || Ctx.platform.isProductChildOf(IGFX_PVC))
         {
             NumDSSPerSlice = SysInfo.MaxSubSlicesSupported / std::max(SysInfo.MaxSlicesSupported, enabledSlices);
             EuCountPerDSS = SysInfo.MaxEuPerSubSlice;