Fix Efficient64b stateful surface index folding for sampler feedback

This optimization must not be applied to the paired texture operand of
Sampler Feedback messages. The paired texture pointer is placed as a full
64-bit address in the sampler header and must remain intact.

Author: skarczew

IGC/Compiler/CISACodeGen/EmitVISAPass.cpp

@@ -5863,7 +5863,7 @@ void EmitPass::emitLdInstruction(llvm::Instruction *inst) {
   ResourceDescriptor pairedResource =
       samplerLoadIntrinsic->hasPairedTextureArg() &&
               llvm::isa<llvm::UndefValue>(samplerLoadIntrinsic->getPairedTextureValue()) == false
-          ? GetResourceVariable(samplerLoadIntrinsic->getPairedTextureValue())
+          ? GetResourceVariable(samplerLoadIntrinsic->getPairedTextureValue(), /*skipStatefulFolding=*/true)
           : ResourceDescriptor();
 
   CVariable *offset = ComputeSampleIntOffset(inst, offsetSourceIndex);
@@ -8431,7 +8431,7 @@ void EmitPass::emitSampleInstruction(SampleIntrinsic *inst) {
   [[maybe_unused]] bool isEval = isUsedOnlyByEval(inst);
   ResourceDescriptor pairedResource =
       inst->hasPairedTextureArg() && llvm::isa<llvm::UndefValue>(inst->getPairedTextureValue()) == false
-          ? GetResourceVariable(inst->getPairedTextureValue())
+          ? GetResourceVariable(inst->getPairedTextureValue(), /*skipStatefulFolding=*/true)
           : ResourceDescriptor();
 
 
@@ -8786,9 +8786,10 @@ void EmitPass::emitGather4Instruction(SamplerGatherIntrinsic *inst) {
   ResourceDescriptor resource = GetResourceVariable(textureValue);
 
   [[maybe_unused]] bool isEval = isUsedOnlyByEval(inst);
-  ResourceDescriptor pairedResource = llvm::isa<llvm::UndefValue>(inst->getPairedTextureValue()) == false
-                                          ? GetResourceVariable(inst->getPairedTextureValue())
-                                          : ResourceDescriptor();
+  ResourceDescriptor pairedResource =
+      llvm::isa<llvm::UndefValue>(inst->getPairedTextureValue()) == false
+          ? GetResourceVariable(inst->getPairedTextureValue(), /*skipStatefulFolding=*/true)
+          : ResourceDescriptor();
 
   SamplerDescriptor sampler;
   Value *samplerValue = inst->getSamplerValue();
@@ -20697,7 +20698,7 @@ void EmitPass::emitGetBufferPtr(GenIntrinsicInst *inst) {
   m_currShader->SetBindingTableEntryCountAndBitmap(directIdx, bufType, 0, bti);
 }
 
-ResourceDescriptor EmitPass::GetResourceVariable(Value *resourcePtr) {
+ResourceDescriptor EmitPass::GetResourceVariable(Value *resourcePtr, bool skipStatefulFolding) {
   ResourceDescriptor resource;
   BufferType bufType = BUFFER_TYPE_UNKNOWN;
   uint as = 0;
@@ -20721,7 +20722,7 @@ ResourceDescriptor EmitPass::GetResourceVariable(Value *resourcePtr) {
     if (IsBindless(bufType) || (bufType == RENDER_TARGET && m_currShader->m_Platform->hasEfficient64bEnabled()) ||
         !directIndexing) {
       auto SetResource = [&](Value *resourcePtr) {
-        if (m_currShader->m_Platform->hasEfficient64bEnabled()) {
+        if (!skipStatefulFolding && m_currShader->m_Platform->hasEfficient64bEnabled()) {
           if (auto SurfaceStateIndex = m_pattern->matchStateIndex(resourcePtr)) {
             resource.m_resource = GetSymbol(SurfaceStateIndex->first);
             resource.m_SurfaceStateIndex = SurfaceStateIndex->second;

IGC/Compiler/CISACodeGen/EmitVISAPass.hpp

@@ -707,7 +707,7 @@ class EmitPass : public llvm::FunctionPass {
                                                    bool nomask = false);
   CVariable *BroadcastAndTruncPointer(CVariable *pVar);
   CVariable *IndexableResourceIndex(CVariable *indexVar, uint btiIndex);
-  ResourceDescriptor GetResourceVariable(llvm::Value *resourcePtr);
+  ResourceDescriptor GetResourceVariable(llvm::Value *resourcePtr, bool skipStatefulFolding = false);
   SamplerDescriptor GetSamplerVariable(llvm::Value *samplerPtr);
   CVariable *ComputeSampleIntOffset(llvm::Instruction *sample, uint sourceIndex);
   void emitPlnInterpolation(CVariable *bary, CVariable *inputvar);