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- optimize access to array members with constant index. Like with struct members this can be combined with the outer index/address.
- fixed register allocation with array indices and stack variables.
This commit is contained in:
parent
2cc48ec378
commit
8205e6cf08
1 changed files with 51 additions and 18 deletions
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@ -5667,13 +5667,16 @@ ExpEmit FxStackVariable::Emit(VMFunctionBuilder *build)
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if (AddressRequested)
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{
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ExpEmit obj(build, REGT_POINTER);
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if (offsetreg >= 0)
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{
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ExpEmit obj(build, REGT_POINTER);
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build->Emit(OP_ADDA_RK, obj.RegNum, build->FramePointer.RegNum, offsetreg);
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return obj;
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}
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else return build->FramePointer;
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else
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{
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return build->FramePointer;
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}
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}
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ExpEmit loc(build, membervar->Type->GetRegType(), membervar->Type->GetRegCount());
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@ -5973,7 +5976,39 @@ FxExpression *FxArrayElement::Resolve(FCompileContext &ctx)
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delete this;
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return nullptr;
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}
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// Todo: optimize out the array.
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// if this is an array within a class or another struct we can simplify the expression by creating a new PField with a cumulative offset.
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if (Array->ExprType == EFX_ClassMember || Array->ExprType == EFX_StructMember)
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{
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auto parentfield = static_cast<FxStructMember *>(Array)->membervar;
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// PFields are garbage collected so this will be automatically taken care of later.
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auto newfield = new PField(NAME_None, arraytype->ElementType, parentfield->Flags, indexval * arraytype->ElementSize + parentfield->Offset);
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static_cast<FxStructMember *>(Array)->membervar = newfield;
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Array->isresolved = false; // re-resolve the parent so it can also check if it can be optimized away.
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auto x = Array->Resolve(ctx);
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Array = nullptr;
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return x;
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}
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else if (Array->ExprType == EFX_GlobalVariable)
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{
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auto parentfield = static_cast<FxGlobalVariable *>(Array)->membervar;
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auto newfield = new PField(NAME_None, arraytype->ElementType, parentfield->Flags, indexval * arraytype->ElementSize + parentfield->Offset);
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static_cast<FxGlobalVariable *>(Array)->membervar = newfield;
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Array->isresolved = false; // re-resolve the parent so it can also check if it can be optimized away.
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auto x = Array->Resolve(ctx);
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Array = nullptr;
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return x;
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}
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else if (Array->ExprType == EFX_StackVariable)
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{
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auto parentfield = static_cast<FxStackVariable *>(Array)->membervar;
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auto newfield = new PField(NAME_None, arraytype->ElementType, parentfield->Flags, indexval * arraytype->ElementSize + parentfield->Offset);
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static_cast<FxStackVariable *>(Array)->ReplaceField(newfield);
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Array->isresolved = false; // re-resolve the parent so it can also check if it can be optimized away.
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auto x = Array->Resolve(ctx);
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Array = nullptr;
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return x;
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}
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}
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ValueType = arraytype->ElementType;
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@ -5996,7 +6031,6 @@ ExpEmit FxArrayElement::Emit(VMFunctionBuilder *build)
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{
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ExpEmit start = Array->Emit(build);
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PArray *const arraytype = static_cast<PArray*>(Array->ValueType);
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ExpEmit dest(build, arraytype->ElementType->GetRegType());
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if (start.Konst)
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{
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@ -6028,11 +6062,14 @@ ExpEmit FxArrayElement::Emit(VMFunctionBuilder *build)
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start = temp;
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}
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}
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return start;
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}
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else
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{
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build->Emit(arraytype->ElementType->GetLoadOp(), dest.RegNum,
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start.RegNum, build->GetConstantInt(indexval));
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start.Free(build);
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ExpEmit dest(build, ValueType->GetRegType());
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build->Emit(arraytype->ElementType->GetLoadOp(), dest.RegNum, start.RegNum, build->GetConstantInt(indexval));
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return dest;
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}
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}
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else
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@ -6059,6 +6096,7 @@ ExpEmit FxArrayElement::Emit(VMFunctionBuilder *build)
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build->Emit(OP_MUL_RK, indexwork.RegNum, indexv.RegNum, build->GetConstantInt(arraytype->ElementSize));
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}
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indexwork.Free(build);
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if (AddressRequested)
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{
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if (!start.Fixed)
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@ -6067,28 +6105,23 @@ ExpEmit FxArrayElement::Emit(VMFunctionBuilder *build)
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}
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else
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{
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start.Free(build);
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// do not clobber local variables.
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ExpEmit temp(build, start.RegType);
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build->Emit(OP_ADDA_RR, temp.RegNum, start.RegNum, indexwork.RegNum);
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start.Free(build);
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start = temp;
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}
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return start;
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}
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else
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{
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build->Emit(arraytype->ElementType->GetLoadOp() + 1, // added 1 to use the *_R version that
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dest.RegNum, start.RegNum, indexwork.RegNum); // takes the offset from a register
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start.Free(build);
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ExpEmit dest(build, ValueType->GetRegType());
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// added 1 to use the *_R version that takes the offset from a register
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build->Emit(arraytype->ElementType->GetLoadOp() + 1, dest.RegNum, start.RegNum, indexwork.RegNum);
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return dest;
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}
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indexwork.Free(build);
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}
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if (AddressRequested)
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{
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dest.Free(build);
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return start;
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}
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start.Free(build);
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return dest;
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}
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//==========================================================================
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