mirror of
https://github.com/luau-lang/luau.git
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534 lines
17 KiB
C++
534 lines
17 KiB
C++
// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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#include "Luau/IrBuilder.h"
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#include "Luau/IrAnalysis.h"
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#include "Luau/IrDump.h"
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#include "Luau/IrUtils.h"
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#include "Luau/OptimizeFinalX64.h"
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#include "doctest.h"
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#include <limits.h>
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using namespace Luau::CodeGen;
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class IrBuilderFixture
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{
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public:
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void constantFold()
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{
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for (size_t i = 0; i < build.function.instructions.size(); i++)
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{
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IrInst& inst = build.function.instructions[i];
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applySubstitutions(build.function, inst);
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foldConstants(build, build.function, uint32_t(i));
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}
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}
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template<typename F>
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void withOneBlock(F&& f)
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{
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IrOp main = build.block(IrBlockKind::Internal);
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IrOp a = build.block(IrBlockKind::Internal);
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build.beginBlock(main);
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f(a);
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build.beginBlock(a);
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build.inst(IrCmd::LOP_RETURN, build.constUint(1));
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};
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template<typename F>
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void withTwoBlocks(F&& f)
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{
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IrOp main = build.block(IrBlockKind::Internal);
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IrOp a = build.block(IrBlockKind::Internal);
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IrOp b = build.block(IrBlockKind::Internal);
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build.beginBlock(main);
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f(a, b);
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build.beginBlock(a);
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build.inst(IrCmd::LOP_RETURN, build.constUint(1));
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build.beginBlock(b);
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build.inst(IrCmd::LOP_RETURN, build.constUint(2));
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};
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void checkEq(IrOp lhs, IrOp rhs)
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{
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CHECK_EQ(lhs.kind, rhs.kind);
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LUAU_ASSERT(lhs.kind != IrOpKind::Constant && "can't compare constants, each ref is unique");
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CHECK_EQ(lhs.index, rhs.index);
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}
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void checkEq(IrOp instOp, const IrInst& inst)
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{
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const IrInst& target = build.function.instOp(instOp);
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CHECK(target.cmd == inst.cmd);
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checkEq(target.a, inst.a);
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checkEq(target.b, inst.b);
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checkEq(target.c, inst.c);
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checkEq(target.d, inst.d);
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checkEq(target.e, inst.e);
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}
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IrBuilder build;
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// Luau.VM headers are not accessible
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static const int tnil = 0;
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static const int tboolean = 1;
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static const int tnumber = 3;
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};
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TEST_SUITE_BEGIN("Optimization");
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TEST_CASE_FIXTURE(IrBuilderFixture, "FinalX64OptCheckTag")
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{
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IrOp block = build.block(IrBlockKind::Internal);
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IrOp fallback = build.block(IrBlockKind::Fallback);
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build.beginBlock(block);
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IrOp tag1 = build.inst(IrCmd::LOAD_TAG, build.vmReg(2));
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build.inst(IrCmd::CHECK_TAG, tag1, build.constTag(0), fallback);
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IrOp tag2 = build.inst(IrCmd::LOAD_TAG, build.vmConst(5));
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build.inst(IrCmd::CHECK_TAG, tag2, build.constTag(0), fallback);
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build.inst(IrCmd::LOP_RETURN, build.constUint(0));
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build.beginBlock(fallback);
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build.inst(IrCmd::LOP_RETURN, build.constUint(0));
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updateUseCounts(build.function);
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optimizeMemoryOperandsX64(build.function);
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// Load from memory is 'inlined' into CHECK_TAG
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CHECK("\n" + toString(build.function, /* includeDetails */ false) == R"(
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bb_0:
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CHECK_TAG R2, tnil, bb_fallback_1
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CHECK_TAG K5, tnil, bb_fallback_1
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LOP_RETURN 0u
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bb_fallback_1:
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LOP_RETURN 0u
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)");
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}
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TEST_CASE_FIXTURE(IrBuilderFixture, "FinalX64OptBinaryArith")
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{
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IrOp block = build.block(IrBlockKind::Internal);
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build.beginBlock(block);
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IrOp opA = build.inst(IrCmd::LOAD_DOUBLE, build.vmReg(1));
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IrOp opB = build.inst(IrCmd::LOAD_DOUBLE, build.vmReg(2));
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build.inst(IrCmd::ADD_NUM, opA, opB);
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build.inst(IrCmd::LOP_RETURN, build.constUint(0));
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updateUseCounts(build.function);
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optimizeMemoryOperandsX64(build.function);
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// Load from memory is 'inlined' into second argument
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CHECK("\n" + toString(build.function, /* includeDetails */ false) == R"(
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bb_0:
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%0 = LOAD_DOUBLE R1
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%2 = ADD_NUM %0, R2
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LOP_RETURN 0u
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)");
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}
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TEST_CASE_FIXTURE(IrBuilderFixture, "FinalX64OptEqTag1")
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{
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IrOp block = build.block(IrBlockKind::Internal);
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IrOp trueBlock = build.block(IrBlockKind::Internal);
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IrOp falseBlock = build.block(IrBlockKind::Internal);
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build.beginBlock(block);
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IrOp opA = build.inst(IrCmd::LOAD_TAG, build.vmReg(1));
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IrOp opB = build.inst(IrCmd::LOAD_TAG, build.vmReg(2));
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build.inst(IrCmd::JUMP_EQ_TAG, opA, opB, trueBlock, falseBlock);
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build.inst(IrCmd::LOP_RETURN, build.constUint(0));
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build.beginBlock(trueBlock);
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build.inst(IrCmd::LOP_RETURN, build.constUint(0));
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build.beginBlock(falseBlock);
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build.inst(IrCmd::LOP_RETURN, build.constUint(0));
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updateUseCounts(build.function);
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optimizeMemoryOperandsX64(build.function);
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// Load from memory is 'inlined' into first argument
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CHECK("\n" + toString(build.function, /* includeDetails */ false) == R"(
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bb_0:
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%1 = LOAD_TAG R2
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JUMP_EQ_TAG R1, %1, bb_1, bb_2
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bb_1:
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LOP_RETURN 0u
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bb_2:
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LOP_RETURN 0u
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)");
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}
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TEST_CASE_FIXTURE(IrBuilderFixture, "FinalX64OptEqTag2")
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{
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IrOp block = build.block(IrBlockKind::Internal);
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IrOp trueBlock = build.block(IrBlockKind::Internal);
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IrOp falseBlock = build.block(IrBlockKind::Internal);
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build.beginBlock(block);
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IrOp opA = build.inst(IrCmd::LOAD_TAG, build.vmReg(1));
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IrOp opB = build.inst(IrCmd::LOAD_TAG, build.vmReg(2));
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build.inst(IrCmd::STORE_TAG, build.vmReg(6), opA);
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build.inst(IrCmd::JUMP_EQ_TAG, opA, opB, trueBlock, falseBlock);
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build.inst(IrCmd::LOP_RETURN, build.constUint(0));
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build.beginBlock(trueBlock);
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build.inst(IrCmd::LOP_RETURN, build.constUint(0));
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build.beginBlock(falseBlock);
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build.inst(IrCmd::LOP_RETURN, build.constUint(0));
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updateUseCounts(build.function);
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optimizeMemoryOperandsX64(build.function);
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// Load from memory is 'inlined' into second argument is it can't be done for the first one
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// We also swap first and second argument to generate memory access on the LHS
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CHECK("\n" + toString(build.function, /* includeDetails */ false) == R"(
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bb_0:
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%0 = LOAD_TAG R1
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STORE_TAG R6, %0
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JUMP_EQ_TAG R2, %0, bb_1, bb_2
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bb_1:
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LOP_RETURN 0u
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bb_2:
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LOP_RETURN 0u
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)");
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}
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TEST_CASE_FIXTURE(IrBuilderFixture, "FinalX64OptEqTag3")
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{
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IrOp block = build.block(IrBlockKind::Internal);
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IrOp trueBlock = build.block(IrBlockKind::Internal);
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IrOp falseBlock = build.block(IrBlockKind::Internal);
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build.beginBlock(block);
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IrOp table = build.inst(IrCmd::LOAD_POINTER, build.vmReg(1));
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IrOp arrElem = build.inst(IrCmd::GET_ARR_ADDR, table, build.constInt(0));
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IrOp opA = build.inst(IrCmd::LOAD_TAG, arrElem);
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build.inst(IrCmd::JUMP_EQ_TAG, opA, build.constTag(0), trueBlock, falseBlock);
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build.inst(IrCmd::LOP_RETURN, build.constUint(0));
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build.beginBlock(trueBlock);
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build.inst(IrCmd::LOP_RETURN, build.constUint(0));
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build.beginBlock(falseBlock);
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build.inst(IrCmd::LOP_RETURN, build.constUint(0));
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updateUseCounts(build.function);
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optimizeMemoryOperandsX64(build.function);
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// Load from memory is 'inlined' into first argument
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CHECK("\n" + toString(build.function, /* includeDetails */ false) == R"(
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bb_0:
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%0 = LOAD_POINTER R1
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%1 = GET_ARR_ADDR %0, 0i
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%2 = LOAD_TAG %1
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JUMP_EQ_TAG %2, tnil, bb_1, bb_2
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bb_1:
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LOP_RETURN 0u
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bb_2:
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LOP_RETURN 0u
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)");
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}
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TEST_CASE_FIXTURE(IrBuilderFixture, "FinalX64OptJumpCmpNum")
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{
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IrOp block = build.block(IrBlockKind::Internal);
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IrOp trueBlock = build.block(IrBlockKind::Internal);
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IrOp falseBlock = build.block(IrBlockKind::Internal);
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build.beginBlock(block);
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IrOp opA = build.inst(IrCmd::LOAD_DOUBLE, build.vmReg(1));
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IrOp opB = build.inst(IrCmd::LOAD_DOUBLE, build.vmReg(2));
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build.inst(IrCmd::JUMP_CMP_NUM, opA, opB, trueBlock, falseBlock);
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build.inst(IrCmd::LOP_RETURN, build.constUint(0));
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build.beginBlock(trueBlock);
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build.inst(IrCmd::LOP_RETURN, build.constUint(0));
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build.beginBlock(falseBlock);
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build.inst(IrCmd::LOP_RETURN, build.constUint(0));
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updateUseCounts(build.function);
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optimizeMemoryOperandsX64(build.function);
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// Load from memory is 'inlined' into first argument
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CHECK("\n" + toString(build.function, /* includeDetails */ false) == R"(
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bb_0:
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%1 = LOAD_DOUBLE R2
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JUMP_CMP_NUM R1, %1, bb_1, bb_2
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bb_1:
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LOP_RETURN 0u
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bb_2:
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LOP_RETURN 0u
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)");
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}
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TEST_SUITE_END();
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TEST_SUITE_BEGIN("ConstantFolding");
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TEST_CASE_FIXTURE(IrBuilderFixture, "Numeric")
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{
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IrOp block = build.block(IrBlockKind::Internal);
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build.beginBlock(block);
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build.inst(IrCmd::STORE_INT, build.vmReg(0), build.inst(IrCmd::ADD_INT, build.constInt(10), build.constInt(20)));
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build.inst(IrCmd::STORE_INT, build.vmReg(0), build.inst(IrCmd::ADD_INT, build.constInt(INT_MAX), build.constInt(1)));
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build.inst(IrCmd::STORE_INT, build.vmReg(0), build.inst(IrCmd::SUB_INT, build.constInt(10), build.constInt(20)));
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build.inst(IrCmd::STORE_INT, build.vmReg(0), build.inst(IrCmd::SUB_INT, build.constInt(INT_MIN), build.constInt(1)));
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build.inst(IrCmd::STORE_DOUBLE, build.vmReg(0), build.inst(IrCmd::ADD_NUM, build.constDouble(2), build.constDouble(5)));
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build.inst(IrCmd::STORE_DOUBLE, build.vmReg(0), build.inst(IrCmd::SUB_NUM, build.constDouble(2), build.constDouble(5)));
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build.inst(IrCmd::STORE_DOUBLE, build.vmReg(0), build.inst(IrCmd::MUL_NUM, build.constDouble(2), build.constDouble(5)));
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build.inst(IrCmd::STORE_DOUBLE, build.vmReg(0), build.inst(IrCmd::DIV_NUM, build.constDouble(2), build.constDouble(5)));
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build.inst(IrCmd::STORE_DOUBLE, build.vmReg(0), build.inst(IrCmd::MOD_NUM, build.constDouble(5), build.constDouble(2)));
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build.inst(IrCmd::STORE_DOUBLE, build.vmReg(0), build.inst(IrCmd::POW_NUM, build.constDouble(5), build.constDouble(2)));
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build.inst(IrCmd::STORE_DOUBLE, build.vmReg(0), build.inst(IrCmd::UNM_NUM, build.constDouble(5)));
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build.inst(IrCmd::STORE_INT, build.vmReg(0), build.inst(IrCmd::NOT_ANY, build.constTag(tnil), build.inst(IrCmd::LOAD_DOUBLE, build.vmReg(1))));
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build.inst(IrCmd::STORE_INT, build.vmReg(0), build.inst(IrCmd::NOT_ANY, build.constTag(tnumber), build.inst(IrCmd::LOAD_DOUBLE, build.vmReg(1))));
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build.inst(IrCmd::STORE_INT, build.vmReg(0), build.inst(IrCmd::NOT_ANY, build.constTag(tboolean), build.constInt(0)));
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build.inst(IrCmd::STORE_INT, build.vmReg(0), build.inst(IrCmd::NOT_ANY, build.constTag(tboolean), build.constInt(1)));
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build.inst(IrCmd::STORE_DOUBLE, build.vmReg(0), build.inst(IrCmd::INT_TO_NUM, build.constInt(8)));
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build.inst(IrCmd::LOP_RETURN, build.constUint(0));
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updateUseCounts(build.function);
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constantFold();
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CHECK("\n" + toString(build.function, /* includeDetails */ false) == R"(
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bb_0:
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STORE_INT R0, 30i
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STORE_INT R0, -2147483648i
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STORE_INT R0, -10i
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STORE_INT R0, 2147483647i
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STORE_DOUBLE R0, 7
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STORE_DOUBLE R0, -3
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STORE_DOUBLE R0, 10
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STORE_DOUBLE R0, 0.40000000000000002
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STORE_DOUBLE R0, 1
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STORE_DOUBLE R0, 25
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STORE_DOUBLE R0, -5
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STORE_INT R0, 1i
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STORE_INT R0, 0i
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STORE_INT R0, 1i
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STORE_INT R0, 0i
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STORE_DOUBLE R0, 8
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LOP_RETURN 0u
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)");
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}
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TEST_CASE_FIXTURE(IrBuilderFixture, "ControlFlowEq")
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{
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withTwoBlocks([this](IrOp a, IrOp b) {
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build.inst(IrCmd::JUMP_EQ_TAG, build.constTag(tnil), build.constTag(tnil), a, b);
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});
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withTwoBlocks([this](IrOp a, IrOp b) {
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build.inst(IrCmd::JUMP_EQ_TAG, build.constTag(tnil), build.constTag(tnumber), a, b);
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});
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withTwoBlocks([this](IrOp a, IrOp b) {
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build.inst(IrCmd::JUMP_EQ_INT, build.constInt(0), build.constInt(0), a, b);
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});
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withTwoBlocks([this](IrOp a, IrOp b) {
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build.inst(IrCmd::JUMP_EQ_INT, build.constInt(0), build.constInt(1), a, b);
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});
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updateUseCounts(build.function);
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constantFold();
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CHECK("\n" + toString(build.function, /* includeDetails */ false) == R"(
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bb_0:
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JUMP bb_1
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bb_1:
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LOP_RETURN 1u
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bb_3:
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JUMP bb_5
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bb_5:
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LOP_RETURN 2u
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bb_6:
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JUMP bb_7
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bb_7:
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LOP_RETURN 1u
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bb_9:
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JUMP bb_11
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bb_11:
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LOP_RETURN 2u
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)");
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}
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TEST_CASE_FIXTURE(IrBuilderFixture, "NumToIndex")
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{
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withOneBlock([this](IrOp a) {
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build.inst(IrCmd::STORE_INT, build.vmReg(0), build.inst(IrCmd::NUM_TO_INDEX, build.constDouble(4), a));
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build.inst(IrCmd::LOP_RETURN, build.constUint(0));
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});
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withOneBlock([this](IrOp a) {
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build.inst(IrCmd::STORE_INT, build.vmReg(0), build.inst(IrCmd::NUM_TO_INDEX, build.constDouble(1.2), a));
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build.inst(IrCmd::LOP_RETURN, build.constUint(0));
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});
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withOneBlock([this](IrOp a) {
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IrOp nan = build.inst(IrCmd::DIV_NUM, build.constDouble(0.0), build.constDouble(0.0));
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build.inst(IrCmd::STORE_INT, build.vmReg(0), build.inst(IrCmd::NUM_TO_INDEX, nan, a));
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build.inst(IrCmd::LOP_RETURN, build.constUint(0));
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});
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updateUseCounts(build.function);
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constantFold();
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CHECK("\n" + toString(build.function, /* includeDetails */ false) == R"(
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bb_0:
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STORE_INT R0, 4i
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LOP_RETURN 0u
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bb_2:
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JUMP bb_3
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bb_3:
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LOP_RETURN 1u
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bb_4:
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JUMP bb_5
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bb_5:
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LOP_RETURN 1u
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)");
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}
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TEST_CASE_FIXTURE(IrBuilderFixture, "Guards")
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{
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withOneBlock([this](IrOp a) {
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build.inst(IrCmd::CHECK_TAG, build.constTag(tnumber), build.constTag(tnumber), a);
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build.inst(IrCmd::LOP_RETURN, build.constUint(0));
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});
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withOneBlock([this](IrOp a) {
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build.inst(IrCmd::CHECK_TAG, build.constTag(tnil), build.constTag(tnumber), a);
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build.inst(IrCmd::LOP_RETURN, build.constUint(0));
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});
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updateUseCounts(build.function);
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constantFold();
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CHECK("\n" + toString(build.function, /* includeDetails */ false) == R"(
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bb_0:
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LOP_RETURN 0u
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bb_2:
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JUMP bb_3
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bb_3:
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LOP_RETURN 1u
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)");
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}
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TEST_CASE_FIXTURE(IrBuilderFixture, "ControlFlowCmpNum")
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{
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IrOp nan = build.inst(IrCmd::DIV_NUM, build.constDouble(0.0), build.constDouble(0.0));
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auto compareFold = [this](IrOp lhs, IrOp rhs, IrCondition cond, bool result) {
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IrOp instOp;
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IrInst instExpected;
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|
withTwoBlocks([&](IrOp a, IrOp b) {
|
|
instOp = build.inst(IrCmd::JUMP_CMP_NUM, lhs, rhs, build.cond(cond), a, b);
|
|
instExpected = IrInst{IrCmd::JUMP, result ? a : b};
|
|
});
|
|
|
|
updateUseCounts(build.function);
|
|
constantFold();
|
|
checkEq(instOp, instExpected);
|
|
};
|
|
|
|
compareFold(build.constDouble(1), build.constDouble(1), IrCondition::Equal, true);
|
|
compareFold(build.constDouble(1), build.constDouble(2), IrCondition::Equal, false);
|
|
compareFold(nan, nan, IrCondition::Equal, false);
|
|
|
|
compareFold(build.constDouble(1), build.constDouble(1), IrCondition::NotEqual, false);
|
|
compareFold(build.constDouble(1), build.constDouble(2), IrCondition::NotEqual, true);
|
|
compareFold(nan, nan, IrCondition::NotEqual, true);
|
|
|
|
compareFold(build.constDouble(1), build.constDouble(1), IrCondition::Less, false);
|
|
compareFold(build.constDouble(1), build.constDouble(2), IrCondition::Less, true);
|
|
compareFold(build.constDouble(2), build.constDouble(1), IrCondition::Less, false);
|
|
compareFold(build.constDouble(1), nan, IrCondition::Less, false);
|
|
|
|
compareFold(build.constDouble(1), build.constDouble(1), IrCondition::NotLess, true);
|
|
compareFold(build.constDouble(1), build.constDouble(2), IrCondition::NotLess, false);
|
|
compareFold(build.constDouble(2), build.constDouble(1), IrCondition::NotLess, true);
|
|
compareFold(build.constDouble(1), nan, IrCondition::NotLess, true);
|
|
|
|
compareFold(build.constDouble(1), build.constDouble(1), IrCondition::LessEqual, true);
|
|
compareFold(build.constDouble(1), build.constDouble(2), IrCondition::LessEqual, true);
|
|
compareFold(build.constDouble(2), build.constDouble(1), IrCondition::LessEqual, false);
|
|
compareFold(build.constDouble(1), nan, IrCondition::LessEqual, false);
|
|
|
|
compareFold(build.constDouble(1), build.constDouble(1), IrCondition::NotLessEqual, false);
|
|
compareFold(build.constDouble(1), build.constDouble(2), IrCondition::NotLessEqual, false);
|
|
compareFold(build.constDouble(2), build.constDouble(1), IrCondition::NotLessEqual, true);
|
|
compareFold(build.constDouble(1), nan, IrCondition::NotLessEqual, true);
|
|
|
|
compareFold(build.constDouble(1), build.constDouble(1), IrCondition::Greater, false);
|
|
compareFold(build.constDouble(1), build.constDouble(2), IrCondition::Greater, false);
|
|
compareFold(build.constDouble(2), build.constDouble(1), IrCondition::Greater, true);
|
|
compareFold(build.constDouble(1), nan, IrCondition::Greater, false);
|
|
|
|
compareFold(build.constDouble(1), build.constDouble(1), IrCondition::NotGreater, true);
|
|
compareFold(build.constDouble(1), build.constDouble(2), IrCondition::NotGreater, true);
|
|
compareFold(build.constDouble(2), build.constDouble(1), IrCondition::NotGreater, false);
|
|
compareFold(build.constDouble(1), nan, IrCondition::NotGreater, true);
|
|
|
|
compareFold(build.constDouble(1), build.constDouble(1), IrCondition::GreaterEqual, true);
|
|
compareFold(build.constDouble(1), build.constDouble(2), IrCondition::GreaterEqual, false);
|
|
compareFold(build.constDouble(2), build.constDouble(1), IrCondition::GreaterEqual, true);
|
|
compareFold(build.constDouble(1), nan, IrCondition::GreaterEqual, false);
|
|
|
|
compareFold(build.constDouble(1), build.constDouble(1), IrCondition::NotGreaterEqual, false);
|
|
compareFold(build.constDouble(1), build.constDouble(2), IrCondition::NotGreaterEqual, true);
|
|
compareFold(build.constDouble(2), build.constDouble(1), IrCondition::NotGreaterEqual, false);
|
|
compareFold(build.constDouble(1), nan, IrCondition::NotGreaterEqual, true);
|
|
}
|
|
|
|
TEST_SUITE_END();
|