[SPIRV] Support for the SPV_INTEL_subgroup_matrix_multiply_accumulate SPIR-V extension (llvm#135225)

Adds support for the SPV_INTEL_subgroup_matrix_multiply_accumulate
SPIR-V extension according to
https://github.com/KhronosGroup/SPIRV-Registry/blob/main/extensions/INTEL/SPV_INTEL_subgroup_matrix_multiply_accumulate.asciidoc

Author: VyacheslavLevytskyy

llvm/docs/SPIRVUsage.rst

@@ -211,6 +211,8 @@ list of supported SPIR-V extensions, sorted alphabetically by their extension na
      - Adds the ability to specify the maximum error for floating-point operations.
    * - ``SPV_INTEL_ternary_bitwise_function``
      - Adds a bitwise instruction on three operands and a look-up table index for specifying the bitwise operation to perform. 
+   * - ``SPV_INTEL_subgroup_matrix_multiply_accumulate``
+     - Adds an instruction to compute the matrix product of an M x K matrix with a K x N matrix and then add an M x N matrix. 
 
 To enable multiple extensions, list them separated by comma. For example, to enable support for atomic operations on floating-point numbers and arbitrary precision integers, use:
 

llvm/lib/Target/SPIRV/SPIRVBuiltins.cpp

@@ -1161,9 +1161,15 @@ static bool generateGroupInst(const SPIRV::IncomingCall *Call,
 
   MachineRegisterInfo *MRI = MIRBuilder.getMRI();
   if (Call->isSpirvOp()) {
-    if (GroupBuiltin->NoGroupOperation)
+    if (GroupBuiltin->NoGroupOperation) {
+      SmallVector<uint32_t, 1> ImmArgs;
+      if (GroupBuiltin->Opcode ==
+              SPIRV::OpSubgroupMatrixMultiplyAccumulateINTEL &&
+          Call->Arguments.size() > 4)
+        ImmArgs.push_back(getConstFromIntrinsic(Call->Arguments[4], MRI));
       return buildOpFromWrapper(MIRBuilder, GroupBuiltin->Opcode, Call,
-                                GR->getSPIRVTypeID(Call->ReturnType));
+                                GR->getSPIRVTypeID(Call->ReturnType), ImmArgs);
+    }
 
     // Group Operation is a literal
     Register GroupOpReg = Call->Arguments[1];

llvm/lib/Target/SPIRV/SPIRVBuiltins.td

@@ -763,6 +763,7 @@ class GroupBuiltin<string name, Op operation> {
   bit NoGroupOperation = !or(IsElect, IsAllOrAny, IsAllEqual,
                              IsBallot, IsInverseBallot,
                              IsBallotBitExtract, IsBallotFindBit,
+                             !eq(operation, OpSubgroupMatrixMultiplyAccumulateINTEL),
                              !eq(operation, OpGroupNonUniformShuffle),
                              !eq(operation, OpGroupNonUniformShuffleXor),
                              !eq(operation, OpGroupNonUniformShuffleUp),
@@ -847,6 +848,9 @@ defm : DemangledGroupBuiltinWrapper<"__spirv_GroupNonUniformBallotFindLSB", 2, 2
 defm : DemangledGroupBuiltin<"group_ballot_find_msb", OnlySub, OpGroupNonUniformBallotFindMSB>;
 defm : DemangledGroupBuiltinWrapper<"__spirv_GroupNonUniformBallotFindMSB", 2, 2, OpGroupNonUniformBallotFindMSB>;
 
+// SPV_INTEL_subgroup_matrix_multiply_accumulate
+defm : DemangledGroupBuiltinWrapper<"__spirv_SubgroupMatrixMultiplyAccumulateINTEL", 4, 5, OpSubgroupMatrixMultiplyAccumulateINTEL>;
+
 // cl_khr_subgroup_shuffle
 defm : DemangledGroupBuiltin<"group_shuffle", OnlySub, OpGroupNonUniformShuffle>;
 defm : DemangledGroupBuiltinWrapper<"__spirv_GroupNonUniformShuffle", 3, 3, OpGroupNonUniformShuffle>;

llvm/lib/Target/SPIRV/SPIRVCommandLine.cpp

@@ -93,6 +93,9 @@ static const std::map<std::string, SPIRV::Extension::Extension, std::less<>>
          SPIRV::Extension::Extension::SPV_INTEL_long_composites},
         {"SPV_INTEL_fp_max_error",
          SPIRV::Extension::Extension::SPV_INTEL_fp_max_error},
+        {"SPV_INTEL_subgroup_matrix_multiply_accumulate",
+         SPIRV::Extension::Extension::
+             SPV_INTEL_subgroup_matrix_multiply_accumulate},
         {"SPV_INTEL_ternary_bitwise_function",
          SPIRV::Extension::Extension::SPV_INTEL_ternary_bitwise_function}};
 

llvm/lib/Target/SPIRV/SPIRVInstrInfo.td

@@ -736,6 +736,10 @@ def OpGroupFMax: OpGroup<"FMax", 269>;
 def OpGroupUMax: OpGroup<"UMax", 270>;
 def OpGroupSMax: OpGroup<"SMax", 271>;
 
+def OpSubgroupMatrixMultiplyAccumulateINTEL: Op<6237, (outs ID:$res),
+        (ins TYPE:$ty, ID:$KDim, ID:$A, ID:$B, ID:$C, variable_ops),
+                  "$res = OpSubgroupMatrixMultiplyAccumulateINTEL $ty $KDim $A $B $C">;
+
 // TODO: 3.42.22. Device-Side Enqueue Instructions
 def OpEnqueueKernel: Op<292, (outs ID:$res), (ins TYPE:$type, ID:$queue, ID:$flags, ID:$NDR, ID:$nevents, ID:$wevents,
                                               ID:$revent, ID:$invoke, ID:$param, ID:$psize, ID:$palign, variable_ops),

llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.cpp

@@ -1799,6 +1799,20 @@ void addInstrRequirements(const MachineInstr &MI,
     Reqs.addCapability(SPIRV::Capability::LongCompositesINTEL);
     break;
   }
+  case SPIRV::OpSubgroupMatrixMultiplyAccumulateINTEL: {
+    if (!ST.canUseExtension(
+            SPIRV::Extension::SPV_INTEL_subgroup_matrix_multiply_accumulate))
+      report_fatal_error(
+          "OpSubgroupMatrixMultiplyAccumulateINTEL instruction requires the "
+          "following SPIR-V "
+          "extension: SPV_INTEL_subgroup_matrix_multiply_accumulate",
+          false);
+    Reqs.addExtension(
+        SPIRV::Extension::SPV_INTEL_subgroup_matrix_multiply_accumulate);
+    Reqs.addCapability(
+        SPIRV::Capability::SubgroupMatrixMultiplyAccumulateINTEL);
+    break;
+  }
   case SPIRV::OpBitwiseFunctionINTEL: {
     if (!ST.canUseExtension(
             SPIRV::Extension::SPV_INTEL_ternary_bitwise_function))

llvm/lib/Target/SPIRV/SPIRVSymbolicOperands.td

@@ -314,6 +314,7 @@ defm SPV_INTEL_long_composites : ExtensionOperand<117>;
 defm SPV_INTEL_memory_access_aliasing : ExtensionOperand<118>;
 defm SPV_INTEL_fp_max_error : ExtensionOperand<119>;
 defm SPV_INTEL_ternary_bitwise_function : ExtensionOperand<120>;
+defm SPV_INTEL_subgroup_matrix_multiply_accumulate : ExtensionOperand<121>;
 
 //===----------------------------------------------------------------------===//
 // Multiclass used to define Capabilities enum values and at the same time
@@ -515,6 +516,7 @@ defm BindlessImagesINTEL : CapabilityOperand<6528, 0, 0, [SPV_INTEL_bindless_ima
 defm MemoryAccessAliasingINTEL : CapabilityOperand<5910, 0, 0, [SPV_INTEL_memory_access_aliasing], []>;
 defm FPMaxErrorINTEL : CapabilityOperand<6169, 0, 0, [SPV_INTEL_fp_max_error], []>;
 defm TernaryBitwiseFunctionINTEL : CapabilityOperand<6241, 0, 0, [SPV_INTEL_ternary_bitwise_function], []>;
+defm SubgroupMatrixMultiplyAccumulateINTEL : CapabilityOperand<6236, 0, 0, [SPV_INTEL_subgroup_matrix_multiply_accumulate], []>;
 
 //===----------------------------------------------------------------------===//
 // Multiclass used to define SourceLanguage enum values and at the same time