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80 lines
3.7 KiB
80 lines
3.7 KiB
#include <vm_lifters.hpp>
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namespace vm
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{
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llvm::Value *lifters_t::add_flags( vm::devirt_t *rtn, std::uint8_t byte_size, llvm::Value *lhs, llvm::Value *rhs )
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{
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auto op_size = llvm::IntegerType::get( *rtn->llvm_ctx, byte_size * 8 );
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std::vector< llvm::Type * > intrinsic_arg_types;
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intrinsic_arg_types.push_back( op_size );
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intrinsic_arg_types.push_back( op_size );
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auto sadd_with_overflow = llvm::Intrinsic::getDeclaration(
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rtn->llvm_module, llvm::Intrinsic::sadd_with_overflow, intrinsic_arg_types );
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auto uadd_with_overflow = llvm::Intrinsic::getDeclaration(
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rtn->llvm_module, llvm::Intrinsic::uadd_with_overflow, intrinsic_arg_types );
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auto u_add = rtn->ir_builder->CreateCall( uadd_with_overflow, { lhs, rhs } );
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auto u_sum = rtn->ir_builder->CreateExtractValue( u_add, { 0 } );
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auto u_of_bit = rtn->ir_builder->CreateExtractValue( u_add, { 1 } );
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auto cf = rtn->ir_builder->CreateZExt( u_of_bit, llvm::IntegerType::get( *rtn->llvm_ctx, 64 ) );
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auto s_add = rtn->ir_builder->CreateCall( sadd_with_overflow, { lhs, rhs } );
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auto s_sum = rtn->ir_builder->CreateExtractValue( s_add, { 0 } );
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auto s_of_bit = rtn->ir_builder->CreateExtractValue( s_add, { 1 } );
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auto of = rtn->ir_builder->CreateZExt( s_of_bit, llvm::IntegerType::get( *rtn->llvm_ctx, 64 ) );
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auto sf = rtn->compute_sf( byte_size, u_sum );
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auto zf = rtn->compute_zf( byte_size, u_sum );
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auto pf = llvm::ConstantInt::get( llvm::IntegerType::get( *rtn->llvm_ctx, 64 ),
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0 ); // TODO make clean PF bit computation...
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auto flags_calc = rtn->combine_flags(
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cf, pf, llvm::ConstantInt::get( llvm::IntegerType::get( *rtn->llvm_ctx, 64 ), 0 ), zf, sf, of );
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return flags_calc;
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}
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lifters_t::lifter_callback_t lifters_t::addq =
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[ & ]( vm::devirt_t *rtn, const vm::instrs::code_block_t &vm_code_block,
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const vm::instrs::virt_instr_t &vinstr, llvm::IRBuilder<> *ir_builder ) {
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auto t1 = rtn->pop( 8 );
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auto t2 = rtn->pop( 8 );
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auto t3 = ir_builder->CreateAdd( t1, t2 );
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rtn->push( 8, t3 );
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auto &vmp_rtn = rtn->vmp_rtns.back();
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auto flags = lifters_t::add_flags( rtn, 8, t1, t2 );
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ir_builder->CreateStore( flags, vmp_rtn->flags );
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rtn->push( 8, rtn->load_value( 8, vmp_rtn->flags ) );
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};
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lifters_t::lifter_callback_t lifters_t::adddw =
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[ & ]( vm::devirt_t *rtn, const vm::instrs::code_block_t &vm_code_block,
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const vm::instrs::virt_instr_t &vinstr, llvm::IRBuilder<> *ir_builder ) {
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auto t1 = rtn->pop( 4 );
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auto t2 = rtn->pop( 4 );
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auto t3 = ir_builder->CreateAdd( t1, t2 );
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rtn->push( 4, t3 );
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auto &vmp_rtn = rtn->vmp_rtns.back();
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auto flags = lifters_t::add_flags( rtn, 4, t1, t2 );
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ir_builder->CreateStore( flags, vmp_rtn->flags );
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rtn->push( 8, rtn->load_value( 8, vmp_rtn->flags ) );
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};
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lifters_t::lifter_callback_t lifters_t::addw =
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[ & ]( vm::devirt_t *rtn, const vm::instrs::code_block_t &vm_code_block,
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const vm::instrs::virt_instr_t &vinstr, llvm::IRBuilder<> *ir_builder ) {
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auto t1 = rtn->pop( 2 );
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auto t2 = rtn->pop( 2 );
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auto t3 = ir_builder->CreateAdd( t1, t2 );
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rtn->push( 2, t3 );
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auto &vmp_rtn = rtn->vmp_rtns.back();
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auto flags = lifters_t::add_flags( rtn, 2, t1, t2 );
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ir_builder->CreateStore( flags, vmp_rtn->flags );
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rtn->push( 8, rtn->load_value( 8, vmp_rtn->flags ) );
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};
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} // namespace vm
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