/*===================== begin_copyright_notice ==================================

Copyright (c) 2017 Intel Corporation

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
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The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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======================= end_copyright_notice ==================================*/
#pragma once
#include "common/igc_regkeys.hpp"
/*
This provides hook to query whether a feature is supported by the runtime we are compiling for
This file has default value, then each adapter can overload any of the query to tell the backend
what it supports and what it doesn't. This also implements some workaround in case some API
or driver doesn't support something
*/

namespace IGC
{

class CDriverInfo
{ 
public:
    /// The driver implements the WA using constant buffer 2 for NOS constants instead of 0
    virtual bool implementPushConstantWA() const { return false; }

    /// Driver supports Simple Push Mechanism only.
    virtual bool SupportsSimplePushOnly() const { return false; }

    /// Driver supports resource streamer if HW supportes it, otherwise simple push
    virtual bool SupportsHWResourceStreameAndSimplePush() const { return false; }

    /// Driver supports dynamic uniform buffers.
    virtual bool SupportsDynamicUniformBuffers() const { return false; }

    /// Compiler can assume that resources bound to two different bindings do not alias.
    virtual bool StatefullResouresNotAliased() const { return false; }

    /// Is any special metadata translation required
    virtual bool NeedsMetadataTranslation() const { return false; }

    /// Do we need to break down the fmuladd
    virtual bool NeedsBreakdownMulAdd() const { return false; }

    /// The driver can use scratch space to store the private memory
    virtual bool usesScratchSpacePrivateMemory() const { return true; }

    /// The max size in bytes of the scratch space per thread.
    unsigned int maxPerThreadScratchSpace() const { return 2 * 1024 * 1024; }

    /// The driver Uses special states to push constants beyond index 256
    virtual bool Uses3DSTATE_DX9_CONSTANT() const { return false; }

    /// The driver uses typed or untyped constant buffers (for ld_raw vs sampler)
    virtual bool UsesTypedConstantBuffers() const { 
        return IGC_IS_FLAG_DISABLED(ConstantBufferThroughHDCExceptForCS); }

    /// The driver doesn't clear the vertex header so it needs to be done in the compiler
    virtual bool NeedClearVertexHeader() const { return false; }
 
    /// do code sinking before CFGSimplification, helps some workloads
    virtual bool CodeSinkingBeforeCFGSimplification() const { return false; }

    /// allow executing constant buffer on the CPU
    virtual bool AllowGenUpdateCB() const { return false; }
    
    /// The driver implements single instance vertex dispatch feature
    virtual bool SupportsSingleInstanceVertexDispatch() const { return false; }
    
    /// We can safely ignore Nan
    virtual bool IgnoreNan() const { return false; }
    
    /// Allow propagation up-converstion of half if it can generate better code
    virtual bool AllowUnsafeHalf() const { return true; }

    /// Allow send fusion (Some API have perf regressions, temp use to turn it off)
    virtual bool AllowSendFusion() const { return true; }

    /// Supports more than 16 samplers
    virtual bool SupportMoreThan16Samplers() const { return false; }

    /// API supports IEEE min/max
    virtual bool SupportsIEEEMinMax() const { return false; }

    /// Supports precise math
    virtual bool SupportsPreciseMath() const { return false; }

    /// Can we always contract mul and add
    virtual bool NeedCheckContractionAllowed() const { return false; }

    /// The API generates load/store of doubles which needs to be broken down
    virtual bool HasDoubleLoadStore() const { return false; }

    /// Needs emulation of 64bits instructions
    virtual bool NeedPreCompiledLibFuncs() const { return false; }

    /// Must support FP64
    virtual bool NeedFP64() const { return false; }

    /// Must support of f32 IEEE divide (also sqrt)
    virtual bool NeedIEEESPDiv() const { return false; }

    /// Has memcpy/memset intrinsic
    virtual bool HasMemoryIntrinsics() const { return false; }

    /// Has load store not natively supported
    virtual bool HasNonNativeLoadStore() const { return false; }

    /// Enable transposing private memory for better access pattern. Causes failures in some APIs
    virtual bool SupportTransposeLayoutForPrivateMemory() const { return true; }

    /// Need lowering global inlined constant buffers
    virtual bool NeedLoweringInlinedConstants() const { return false; }

    /// Turn on type demotion, not tested on all APIs
    virtual bool benefitFromTypeDemotion() const { return false; }

    /// Turn on type rematerialization of flag register, not tested on all APIs
    virtual bool benefitFromPreRARematFlag() const { return false; }

    /// add extra optimization passes after AlwaysInlinerPass to support two phase inlining
    virtual bool NeedExtraPassesAfterAlwaysInlinerPass() const { return false; }

    /// Turn on vISA pre-RA scheduler. Not tested on all APIs
    virtual bool enableVISAPreRAScheduler() const { return false; }

    /// Configure vISA pre-RA scheduler. Not tested on all APIs
    virtual unsigned getVISAPreRASchedulerCtrl() const { return 4; }

    /// Make sure optimization are consistent to avoid Z-fighting issue
    virtual bool PreventZFighting() const { return false; }

    /// Force enabling SIMD32 in case we exepct latency problem. Helps some workloads
    virtual bool AlwaysEnableSimd32() const { return false; }

    /// Driver supports promoting buffers to bindful
    virtual bool SupportsStatelessToStatefullBufferTransformation() const { return false; }

    /// Pick fixed 64B URB header in case we need consistent indpendent linking
    virtual bool HasFixedURBHeaderSize() const { return false; }

    /// Need emulation of 64bits type for HW not supporting it natively
    virtual bool Enable64BitEmu() const { return false; }

    /// In some cases several BTI may alias
    virtual bool DisableDpSendReordering() const { return false; }

    /// Driver uses HW alt math mode, this cause floating point operations to behave differently
    virtual bool UseALTMode() const { return false; }

    /// Whether the driver supports blend to fill opt
    virtual bool SupportBlendToFillOpt() const { return false; }

    /// Need to know if the driver can accept more than one SIMD mode for compute shaders
    virtual bool sendMultipleSIMDModes() const { return false; }
    /// pick behavior whether we need to keep discarded helper pixels to calculate
    /// gradient correctly for sampler or we need to force early out discarded pixels
    virtual bool KeepDiscardHelperPixels() const { return false; }
    virtual bool SupportElfFormat() const { return false; }
    
    /// Adjust adapter to adjust the loop unrolling threshold
    virtual unsigned int GetLoopUnrollThreshold() const
    {
        return 4000;
    }
    // ----------------------------------------------------------------------
    // Below are workaround for bugs in front end or IGC will be removed once
    // the bugs are fixed

    /// Need workaround for A32 messages used along with A64
    virtual bool NeedWAToTransformA32MessagesToA64() const { return false; }

    /// disable mad in Vertex shader to avoid ZFigthing issues
    virtual bool DisabeMatchMad() const { return false; }

    /// WA bug in load store pattern match, needs to be cleaned up
    virtual bool WALoadStorePatternMatch() const { return false; }

    /// Some FE sends SLM pointers in DWORD units
    virtual bool WASLMPointersDwordUnit() const { return false; }

    /// Custom pass haven't been tested on all APIs
    virtual bool WADisableCustomPass() const { return false; }

    /// MemOpt2ForOCL pass not tested on all APIs
    virtual bool WAEnableMemOpt2ForOCL() const { return false; }

    /// disable some optimizations for front end which sends IR with unresolved NOS function when optimizing
    virtual bool WaNOSNotResolved() const { return false; }

    /// Temporarary disable GS attr const interpolation promotion
    virtual bool WADisableConstInterpolationPromotion() const { return false; }

    /// WA for APIs where frc generates a different precision than x - rndd(x) for small negative values
    /// Needs to switch to use fast math flags
    virtual bool DisableMatchFrcPatternMatch() const { return false; }

    /// Based on the type of inlined sampler we get we program different output.
    virtual bool ProgrammableBorderColorInCompute() const { return false; }

    /// WA for failures with HS with push constants
    virtual bool WaDisablePushConstantsForHS() const { return false; }

    /// Check if we have to worry about stack overflow while recursing in loop analysis
    virtual bool HasSmallStack() const { return false; }
};

}//namespace IGC
