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pg_numeric_func_generator.cc
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//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2016 Pivotal Software, Inc.
//
// @filename:
// pg_numeric_func_generator.cc
//
// @doc:
// Base class for numeric functions to generate code
//
//---------------------------------------------------------------------------
#include "codegen/pg_numeric_func_generator.h"
using gpcodegen::GpCodegenUtils;
using gpcodegen::PGNumericFuncGenerator;
using gpcodegen::PGFuncGeneratorInfo;
bool PGNumericFuncGenerator::GenerateIntFloatAvgAmalg(
gpcodegen::GpCodegenUtils* codegen_utils,
const gpcodegen::PGFuncGeneratorInfo& pg_func_info,
llvm::Value** llvm_out_value) {
// TODO(nikos): Can we figure if we need to detoast during generation?
llvm::Function* llvm_pg_detoast_datum = codegen_utils->
GetOrRegisterExternalFunction(pg_detoast_datum, "pg_detoast_datum");
auto irb = codegen_utils->ir_builder();
llvm::Function* current_function = irb->GetInsertBlock()->getParent();
llvm::Value* llvm_in_tr0 =
irb->CreateCall(llvm_pg_detoast_datum, {pg_func_info.llvm_args[0]});
llvm::Value* llvm_in_tr1 =
irb->CreateCall(llvm_pg_detoast_datum, {pg_func_info.llvm_args[1]});
// if(transdata == NULL ||
// VARSIZE(transdata) != sizeof(IntFloatAvgTransdata)) { ... }
llvm::Value* llvm_tr0 = nullptr;
GeneratePallocTransdata(codegen_utils, llvm_in_tr0, &llvm_tr0);
// if(tr1 == NULL || VARSIZE(tr1) != sizeof(IntFloatAvgTransdata))
llvm::Value* llvm_varlena_null_size_cond = nullptr;
GenerateVarlenSizeCheck(codegen_utils,
llvm_in_tr1,
codegen_utils->
GetConstant<uint32>(sizeof(IntFloatAvgTransdata)),
&llvm_varlena_null_size_cond);
llvm::BasicBlock* update_block = codegen_utils->CreateBasicBlock(
"update_block", current_function);
llvm::BasicBlock* end_update_block = codegen_utils->CreateBasicBlock(
"end_update_block", current_function);
irb->CreateCondBr(llvm_varlena_null_size_cond,
end_update_block,
update_block);
irb->SetInsertPoint(update_block);
// tr0->count += tr1->count;
// tr0->sum += tr1->sum; {{
llvm::Value* llvm_tr0_sum_ptr =
codegen_utils->GetPointerToMember(llvm_tr0, &IntFloatAvgTransdata::sum);
llvm::Value* llvm_tr0_count_ptr =
codegen_utils->GetPointerToMember(llvm_tr0, &IntFloatAvgTransdata::count);
llvm::Value* llvm_tr1_sum_ptr = codegen_utils->
GetPointerToMember(llvm_in_tr1, &IntFloatAvgTransdata::sum);
llvm::Value* llvm_tr1_count_ptr = codegen_utils->
GetPointerToMember(llvm_in_tr1, &IntFloatAvgTransdata::count);
irb->CreateStore(irb->CreateFAdd(
irb->CreateLoad(llvm_tr0_sum_ptr),
irb->CreateLoad(llvm_tr1_sum_ptr)),
llvm_tr0_sum_ptr);
irb->CreateStore(irb->CreateAdd(
irb->CreateLoad(llvm_tr0_count_ptr),
irb->CreateLoad(llvm_tr1_count_ptr)),
llvm_tr0_count_ptr);
// }}
irb->CreateBr(end_update_block);
irb->SetInsertPoint(end_update_block);
*llvm_out_value = llvm_tr0;
return true;
}
bool PGNumericFuncGenerator::GenerateVarlenSizeCheck(
gpcodegen::GpCodegenUtils* codegen_utils,
llvm::Value* llvm_ptr,
llvm::Value* llvm_size,
llvm::Value** llvm_out_cond) {
llvm::Function* llvm_varsize = codegen_utils->
GetOrRegisterExternalFunction(VARSIZE_regular, "VARSIZE_regular");
auto irb = codegen_utils->ir_builder();
*llvm_out_cond = irb->CreateOr(
irb->CreateICmpEQ(llvm_ptr, codegen_utils->GetConstant<void*>(nullptr)),
irb->CreateICmpNE(
irb->CreateCall(llvm_varsize, {llvm_ptr}),
llvm_size));
return true;
}
bool PGNumericFuncGenerator::GeneratePallocTransdata(
gpcodegen::GpCodegenUtils* codegen_utils,
llvm::Value* llvm_in_transdata_ptr,
llvm::Value** llvm_out_trandata_ptr) {
llvm::Function* llvm_set_varsize = codegen_utils->
GetOrRegisterExternalFunction(SET_VARSIZE_regular, "SET_VARSIZE_regular");
auto irb = codegen_utils->ir_builder();
llvm::BasicBlock* entry_block = irb->GetInsertBlock();
llvm::Function* current_function = entry_block->getParent();
llvm::BasicBlock* transdata_palloc_block = codegen_utils->
CreateBasicBlock("transdata_palloc_block", current_function);
llvm::BasicBlock* end_transdata_palloc_block = codegen_utils->
CreateBasicBlock("end_transdata_palloc_block", current_function);
// if(tr0 == NULL || VARSIZE(tr0) != sizeof(IntFloatAvgTransdata)) {{
llvm::Value* palloc_cond = nullptr;
GenerateVarlenSizeCheck(codegen_utils,
llvm_in_transdata_ptr,
codegen_utils->GetConstant<uint32>(
sizeof(IntFloatAvgTransdata)),
&palloc_cond);
irb->CreateCondBr(palloc_cond,
transdata_palloc_block,
end_transdata_palloc_block);
// }}
irb->SetInsertPoint(transdata_palloc_block);
// tr0 = (IntFloatAvgTransdata *) palloc(sizeof(IntFloatAvgTransdata));
llvm::Value* llvm_palloc_transdata_ptr =
EXPAND_CREATE_PALLOC(codegen_utils, sizeof(IntFloatAvgTransdata));
// SET_VARSIZE(tr0, sizeof(IntFloatAvgTransdata));
irb->CreateCall(llvm_set_varsize, {
llvm_palloc_transdata_ptr,
codegen_utils->GetConstant(sizeof(IntFloatAvgTransdata))});
// tr0->sum = 0;
irb->CreateStore(codegen_utils->GetConstant<float8>(0),
codegen_utils->GetPointerToMember(
llvm_palloc_transdata_ptr, &IntFloatAvgTransdata::sum));
// tr0->count = 0;
irb->CreateStore(codegen_utils->GetConstant<int64>(0),
codegen_utils->GetPointerToMember(
llvm_palloc_transdata_ptr,
&IntFloatAvgTransdata::count));
irb->CreateBr(end_transdata_palloc_block);
irb->SetInsertPoint(end_transdata_palloc_block);
assert(llvm_in_transdata_ptr->getType() ==
llvm_palloc_transdata_ptr->getType());
llvm::PHINode* llvm_transdata_ptr = irb->
CreatePHI(llvm_in_transdata_ptr->getType(), 2);
llvm_transdata_ptr->addIncoming(llvm_in_transdata_ptr, entry_block);
llvm_transdata_ptr->addIncoming(llvm_palloc_transdata_ptr,
transdata_palloc_block);
*llvm_out_trandata_ptr = llvm_transdata_ptr;
return true;
}