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// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef sw_ShaderCore_hpp
#define sw_ShaderCore_hpp
#include "Reactor/Print.hpp"
#include "Reactor/Reactor.hpp"
#include "System/Debug.hpp"
#include <array>
#include <atomic> // std::memory_order
#include <utility> // std::pair
namespace sw {
using namespace rr;
class Vector4s
{
public:
Vector4s();
Vector4s(unsigned short x, unsigned short y, unsigned short z, unsigned short w);
Vector4s(const Vector4s &rhs);
Short4 &operator[](int i);
Vector4s &operator=(const Vector4s &rhs);
Short4 x;
Short4 y;
Short4 z;
Short4 w;
};
class Vector4f
{
public:
Vector4f();
Vector4f(float x, float y, float z, float w);
Vector4f(const Vector4f &rhs);
Float4 &operator[](int i);
Vector4f &operator=(const Vector4f &rhs);
Float4 x;
Float4 y;
Float4 z;
Float4 w;
};
class Vector4i
{
public:
Vector4i();
Vector4i(int x, int y, int z, int w);
Vector4i(const Vector4i &rhs);
Int4 &operator[](int i);
Vector4i &operator=(const Vector4i &rhs);
Int4 x;
Int4 y;
Int4 z;
Int4 w;
};
enum class OutOfBoundsBehavior
{
Nullify, // Loads become zero, stores are elided.
RobustBufferAccess, // As defined by the Vulkan spec (in short: access anywhere within bounds, or zeroing).
UndefinedValue, // Only for load operations. Not secure. No program termination.
UndefinedBehavior, // Program may terminate.
};
// SIMD contains types that represent multiple scalars packed into a single
// vector data type. Types in the SIMD namespace provide a semantic hint
// that the data should be treated as a per-execution-lane scalar instead of
// a typical euclidean-style vector type.
namespace SIMD {
// Width is the number of per-lane scalars packed into each SIMD vector.
static constexpr int Width = 4;
using Float = rr::Float4;
using Int = rr::Int4;
using UInt = rr::UInt4;
struct Pointer
{
Pointer(rr::Pointer<Byte> base, rr::Int limit);
Pointer(rr::Pointer<Byte> base, unsigned int limit);
Pointer(rr::Pointer<Byte> base, rr::Int limit, SIMD::Int offset);
Pointer(rr::Pointer<Byte> base, unsigned int limit, SIMD::Int offset);
Pointer &operator+=(Int i);
Pointer &operator*=(Int i);
Pointer operator+(SIMD::Int i);
Pointer operator*(SIMD::Int i);
Pointer &operator+=(int i);
Pointer &operator*=(int i);
Pointer operator+(int i);
Pointer operator*(int i);
SIMD::Int offsets() const;
SIMD::Int isInBounds(unsigned int accessSize, OutOfBoundsBehavior robustness) const;
bool isStaticallyInBounds(unsigned int accessSize, OutOfBoundsBehavior robustness) const;
rr::Int limit() const;
// Returns true if all offsets are sequential
// (N+0*step, N+1*step, N+2*step, N+3*step)
rr::Bool hasSequentialOffsets(unsigned int step) const;
// Returns true if all offsets are are compile-time static and
// sequential (N+0*step, N+1*step, N+2*step, N+3*step)
bool hasStaticSequentialOffsets(unsigned int step) const;
// Returns true if all offsets are equal (N, N, N, N)
rr::Bool hasEqualOffsets() const;
// Returns true if all offsets are compile-time static and are equal
// (N, N, N, N)
bool hasStaticEqualOffsets() const;
template<typename T>
inline T Load(OutOfBoundsBehavior robustness, Int mask, bool atomic = false, std::memory_order order = std::memory_order_relaxed, int alignment = sizeof(float));
template<typename T>
inline void Store(T val, OutOfBoundsBehavior robustness, Int mask, bool atomic = false, std::memory_order order = std::memory_order_relaxed);
template<typename T>
inline void Store(RValue<T> val, OutOfBoundsBehavior robustness, Int mask, bool atomic = false, std::memory_order order = std::memory_order_relaxed);
// Base address for the pointer, common across all lanes.
rr::Pointer<rr::Byte> base;
// Upper (non-inclusive) limit for offsets from base.
rr::Int dynamicLimit; // If hasDynamicLimit is false, dynamicLimit is zero.
unsigned int staticLimit;
// Per lane offsets from base.
SIMD::Int dynamicOffsets; // If hasDynamicOffsets is false, all dynamicOffsets are zero.
std::array<int32_t, SIMD::Width> staticOffsets;
bool hasDynamicLimit; // True if dynamicLimit is non-zero.
bool hasDynamicOffsets; // True if any dynamicOffsets are non-zero.
};
template<typename T>
struct Element
{};
template<>
struct Element<Float>
{
using type = rr::Float;
};
template<>
struct Element<Int>
{
using type = rr::Int;
};
template<>
struct Element<UInt>
{
using type = rr::UInt;
};
} // namespace SIMD
Float4 exponential2(RValue<Float4> x, bool pp = false);
Float4 logarithm2(RValue<Float4> x, bool pp = false);
Float4 exponential(RValue<Float4> x, bool pp = false);
Float4 logarithm(RValue<Float4> x, bool pp = false);
Float4 power(RValue<Float4> x, RValue<Float4> y, bool pp = false);
Float4 reciprocal(RValue<Float4> x, bool pp = false, bool exactAtPow2 = false);
Float4 reciprocalSquareRoot(RValue<Float4> x, bool abs, bool pp = false);
Float4 modulo(RValue<Float4> x, RValue<Float4> y);
Float4 sine_pi(RValue<Float4> x, bool pp = false); // limited to [-pi, pi] range
Float4 cosine_pi(RValue<Float4> x, bool pp = false); // limited to [-pi, pi] range
Float4 sine(RValue<Float4> x, bool pp = false);
Float4 cosine(RValue<Float4> x, bool pp = false);
Float4 tangent(RValue<Float4> x, bool pp = false);
Float4 arccos(RValue<Float4> x, bool pp = false);
Float4 arcsin(RValue<Float4> x, bool pp = false);
Float4 arctan(RValue<Float4> x, bool pp = false);
Float4 arctan(RValue<Float4> y, RValue<Float4> x, bool pp = false);
Float4 sineh(RValue<Float4> x, bool pp = false);
Float4 cosineh(RValue<Float4> x, bool pp = false);
Float4 tangenth(RValue<Float4> x, bool pp = false);
Float4 arccosh(RValue<Float4> x, bool pp = false); // Limited to x >= 1
Float4 arcsinh(RValue<Float4> x, bool pp = false);
Float4 arctanh(RValue<Float4> x, bool pp = false); // Limited to ]-1, 1[ range
Float4 dot2(const Vector4f &v0, const Vector4f &v1);
Float4 dot3(const Vector4f &v0, const Vector4f &v1);
Float4 dot4(const Vector4f &v0, const Vector4f &v1);
void transpose4x4(Short4 &row0, Short4 &row1, Short4 &row2, Short4 &row3);
void transpose4x3(Short4 &row0, Short4 &row1, Short4 &row2, Short4 &row3);
void transpose4x4(Float4 &row0, Float4 &row1, Float4 &row2, Float4 &row3);
void transpose4x3(Float4 &row0, Float4 &row1, Float4 &row2, Float4 &row3);
void transpose4x2(Float4 &row0, Float4 &row1, Float4 &row2, Float4 &row3);
void transpose4x1(Float4 &row0, Float4 &row1, Float4 &row2, Float4 &row3);
void transpose2x4(Float4 &row0, Float4 &row1, Float4 &row2, Float4 &row3);
void transpose4xN(Float4 &row0, Float4 &row1, Float4 &row2, Float4 &row3, int N);
sw::SIMD::UInt halfToFloatBits(sw::SIMD::UInt halfBits);
sw::SIMD::UInt floatToHalfBits(sw::SIMD::UInt floatBits, bool storeInUpperBits);
Float4 r11g11b10Unpack(UInt r11g11b10bits);
UInt r11g11b10Pack(const Float4 &value);
rr::RValue<rr::Bool> AnyTrue(rr::RValue<sw::SIMD::Int> const &ints);
rr::RValue<rr::Bool> AnyFalse(rr::RValue<sw::SIMD::Int> const &ints);
template<typename T>
inline rr::RValue<T> AndAll(rr::RValue<T> const &mask);
template<typename T>
inline rr::RValue<T> OrAll(rr::RValue<T> const &mask);
rr::RValue<sw::SIMD::Float> Sign(rr::RValue<sw::SIMD::Float> const &val);
// Returns the <whole, frac> of val.
// Both whole and frac will have the same sign as val.
std::pair<rr::RValue<sw::SIMD::Float>, rr::RValue<sw::SIMD::Float>>
Modf(rr::RValue<sw::SIMD::Float> const &val);
// Returns the number of 1s in bits, per lane.
sw::SIMD::UInt CountBits(rr::RValue<sw::SIMD::UInt> const &bits);
// Returns 1 << bits.
// If the resulting bit overflows a 32 bit integer, 0 is returned.
rr::RValue<sw::SIMD::UInt> NthBit32(rr::RValue<sw::SIMD::UInt> const &bits);
// Returns bitCount number of of 1's starting from the LSB.
rr::RValue<sw::SIMD::UInt> Bitmask32(rr::RValue<sw::SIMD::UInt> const &bitCount);
// Performs a fused-multiply add, returning a * b + c.
rr::RValue<sw::SIMD::Float> FMA(
rr::RValue<sw::SIMD::Float> const &a,
rr::RValue<sw::SIMD::Float> const &b,
rr::RValue<sw::SIMD::Float> const &c);
// Returns the exponent of the floating point number f.
// Assumes IEEE 754
rr::RValue<sw::SIMD::Int> Exponent(rr::RValue<sw::SIMD::Float> f);
// Returns y if y < x; otherwise result is x.
// If one operand is a NaN, the other operand is the result.
// If both operands are NaN, the result is a NaN.
rr::RValue<sw::SIMD::Float> NMin(rr::RValue<sw::SIMD::Float> const &x, rr::RValue<sw::SIMD::Float> const &y);
// Returns y if y > x; otherwise result is x.
// If one operand is a NaN, the other operand is the result.
// If both operands are NaN, the result is a NaN.
rr::RValue<sw::SIMD::Float> NMax(rr::RValue<sw::SIMD::Float> const &x, rr::RValue<sw::SIMD::Float> const &y);
// Returns the determinant of a 2x2 matrix.
rr::RValue<sw::SIMD::Float> Determinant(
rr::RValue<sw::SIMD::Float> const &a, rr::RValue<sw::SIMD::Float> const &b,
rr::RValue<sw::SIMD::Float> const &c, rr::RValue<sw::SIMD::Float> const &d);
// Returns the determinant of a 3x3 matrix.
rr::RValue<sw::SIMD::Float> Determinant(
rr::RValue<sw::SIMD::Float> const &a, rr::RValue<sw::SIMD::Float> const &b, rr::RValue<sw::SIMD::Float> const &c,
rr::RValue<sw::SIMD::Float> const &d, rr::RValue<sw::SIMD::Float> const &e, rr::RValue<sw::SIMD::Float> const &f,
rr::RValue<sw::SIMD::Float> const &g, rr::RValue<sw::SIMD::Float> const &h, rr::RValue<sw::SIMD::Float> const &i);
// Returns the determinant of a 4x4 matrix.
rr::RValue<sw::SIMD::Float> Determinant(
rr::RValue<sw::SIMD::Float> const &a, rr::RValue<sw::SIMD::Float> const &b, rr::RValue<sw::SIMD::Float> const &c, rr::RValue<sw::SIMD::Float> const &d,
rr::RValue<sw::SIMD::Float> const &e, rr::RValue<sw::SIMD::Float> const &f, rr::RValue<sw::SIMD::Float> const &g, rr::RValue<sw::SIMD::Float> const &h,
rr::RValue<sw::SIMD::Float> const &i, rr::RValue<sw::SIMD::Float> const &j, rr::RValue<sw::SIMD::Float> const &k, rr::RValue<sw::SIMD::Float> const &l,
rr::RValue<sw::SIMD::Float> const &m, rr::RValue<sw::SIMD::Float> const &n, rr::RValue<sw::SIMD::Float> const &o, rr::RValue<sw::SIMD::Float> const &p);
// Returns the inverse of a 2x2 matrix.
std::array<rr::RValue<sw::SIMD::Float>, 4> MatrixInverse(
rr::RValue<sw::SIMD::Float> const &a, rr::RValue<sw::SIMD::Float> const &b,
rr::RValue<sw::SIMD::Float> const &c, rr::RValue<sw::SIMD::Float> const &d);
// Returns the inverse of a 3x3 matrix.
std::array<rr::RValue<sw::SIMD::Float>, 9> MatrixInverse(
rr::RValue<sw::SIMD::Float> const &a, rr::RValue<sw::SIMD::Float> const &b, rr::RValue<sw::SIMD::Float> const &c,
rr::RValue<sw::SIMD::Float> const &d, rr::RValue<sw::SIMD::Float> const &e, rr::RValue<sw::SIMD::Float> const &f,
rr::RValue<sw::SIMD::Float> const &g, rr::RValue<sw::SIMD::Float> const &h, rr::RValue<sw::SIMD::Float> const &i);
// Returns the inverse of a 4x4 matrix.
std::array<rr::RValue<sw::SIMD::Float>, 16> MatrixInverse(
rr::RValue<sw::SIMD::Float> const &a, rr::RValue<sw::SIMD::Float> const &b, rr::RValue<sw::SIMD::Float> const &c, rr::RValue<sw::SIMD::Float> const &d,
rr::RValue<sw::SIMD::Float> const &e, rr::RValue<sw::SIMD::Float> const &f, rr::RValue<sw::SIMD::Float> const &g, rr::RValue<sw::SIMD::Float> const &h,
rr::RValue<sw::SIMD::Float> const &i, rr::RValue<sw::SIMD::Float> const &j, rr::RValue<sw::SIMD::Float> const &k, rr::RValue<sw::SIMD::Float> const &l,
rr::RValue<sw::SIMD::Float> const &m, rr::RValue<sw::SIMD::Float> const &n, rr::RValue<sw::SIMD::Float> const &o, rr::RValue<sw::SIMD::Float> const &p);
////////////////////////////////////////////////////////////////////////////
// Inline functions
////////////////////////////////////////////////////////////////////////////
template<typename T>
inline T SIMD::Pointer::Load(OutOfBoundsBehavior robustness, Int mask, bool atomic /* = false */, std::memory_order order /* = std::memory_order_relaxed */, int alignment /* = sizeof(float) */)
{
using EL = typename Element<T>::type;
if(isStaticallyInBounds(sizeof(float), robustness))
{
// All elements are statically known to be in-bounds.
// We can avoid costly conditional on masks.
if(hasStaticSequentialOffsets(sizeof(float)))
{
// Offsets are sequential. Perform regular load.
return rr::Load(rr::Pointer<T>(base + staticOffsets[0]), alignment, atomic, order);
}
if(hasStaticEqualOffsets())
{
// Load one, replicate.
return T(*rr::Pointer<EL>(base + staticOffsets[0], alignment));
}
}
else
{
switch(robustness)
{
case OutOfBoundsBehavior::Nullify:
case OutOfBoundsBehavior::RobustBufferAccess:
case OutOfBoundsBehavior::UndefinedValue:
mask &= isInBounds(sizeof(float), robustness); // Disable out-of-bounds reads.
break;
case OutOfBoundsBehavior::UndefinedBehavior:
// Nothing to do. Application/compiler must guarantee no out-of-bounds accesses.
break;
}
}
auto offs = offsets();
if(!atomic && order == std::memory_order_relaxed)
{
if(hasStaticEqualOffsets())
{
// Load one, replicate.
// Be careful of the case where the post-bounds-check mask
// is 0, in which case we must not load.
T out = T(0);
If(AnyTrue(mask))
{
EL el = *rr::Pointer<EL>(base + staticOffsets[0], alignment);
out = T(el);
}
return out;
}
bool zeroMaskedLanes = true;
switch(robustness)
{
case OutOfBoundsBehavior::Nullify:
case OutOfBoundsBehavior::RobustBufferAccess: // Must either return an in-bounds value, or zero.
zeroMaskedLanes = true;
break;
case OutOfBoundsBehavior::UndefinedValue:
case OutOfBoundsBehavior::UndefinedBehavior:
zeroMaskedLanes = false;
break;
}
// TODO(b/195446858): Optimize static sequential offsets case by using masked load.
return rr::Gather(rr::Pointer<EL>(base), offs, mask, alignment, zeroMaskedLanes);
}
else
{
T out;
auto anyLanesDisabled = AnyFalse(mask);
If(hasEqualOffsets() && !anyLanesDisabled)
{
// Load one, replicate.
auto offset = Extract(offs, 0);
out = T(rr::Load(rr::Pointer<EL>(&base[offset]), alignment, atomic, order));
}
Else If(hasSequentialOffsets(sizeof(float)) && !anyLanesDisabled)
{
// Load all elements in a single SIMD instruction.
auto offset = Extract(offs, 0);
out = rr::Load(rr::Pointer<T>(&base[offset]), alignment, atomic, order);
}
Else
{
// Divergent offsets or masked lanes.
out = T(0);
for(int i = 0; i < SIMD::Width; i++)
{
If(Extract(mask, i) != 0)
{
auto offset = Extract(offs, i);
auto el = rr::Load(rr::Pointer<EL>(&base[offset]), alignment, atomic, order);
out = Insert(out, el, i);
}
}
}
return out;
}
}
template<typename T>
inline void SIMD::Pointer::Store(T val, OutOfBoundsBehavior robustness, Int mask, bool atomic /* = false */, std::memory_order order /* = std::memory_order_relaxed */)
{
using EL = typename Element<T>::type;
constexpr size_t alignment = sizeof(float);
auto offs = offsets();
switch(robustness)
{
case OutOfBoundsBehavior::Nullify:
case OutOfBoundsBehavior::RobustBufferAccess: // TODO: Allows writing anywhere within bounds. Could be faster than masking.
case OutOfBoundsBehavior::UndefinedValue: // Should not be used for store operations. Treat as robust buffer access.
mask &= isInBounds(sizeof(float), robustness); // Disable out-of-bounds writes.
break;
case OutOfBoundsBehavior::UndefinedBehavior:
// Nothing to do. Application/compiler must guarantee no out-of-bounds accesses.
break;
}
if(!atomic && order == std::memory_order_relaxed)
{
if(hasStaticEqualOffsets())
{
If(AnyTrue(mask))
{
// All equal. One of these writes will win -- elect the winning lane.
auto v0111 = SIMD::Int(0, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF);
auto elect = mask & ~(v0111 & (mask.xxyz | mask.xxxy | mask.xxxx));
auto maskedVal = As<SIMD::Int>(val) & elect;
auto scalarVal = Extract(maskedVal, 0) |
Extract(maskedVal, 1) |
Extract(maskedVal, 2) |
Extract(maskedVal, 3);
*rr::Pointer<EL>(base + staticOffsets[0], alignment) = As<EL>(scalarVal);
}
}
else if(hasStaticSequentialOffsets(sizeof(float)) &&
isStaticallyInBounds(sizeof(float), robustness))
{
// TODO(b/195446858): Optimize using masked store.
// Pointer has no elements OOB, and the store is not atomic.
// Perform a read-modify-write.
auto p = rr::Pointer<SIMD::Int>(base + staticOffsets[0], alignment);
auto prev = *p;
*p = (prev & ~mask) | (As<SIMD::Int>(val) & mask);
}
else
{
rr::Scatter(rr::Pointer<EL>(base), val, offs, mask, alignment);
}
}
else
{
auto anyLanesDisabled = AnyFalse(mask);
If(hasSequentialOffsets(sizeof(float)) && !anyLanesDisabled)
{
// Store all elements in a single SIMD instruction.
auto offset = Extract(offs, 0);
rr::Store(val, rr::Pointer<T>(&base[offset]), alignment, atomic, order);
}
Else
{
// Divergent offsets or masked lanes.
for(int i = 0; i < SIMD::Width; i++)
{
If(Extract(mask, i) != 0)
{
auto offset = Extract(offs, i);
rr::Store(Extract(val, i), rr::Pointer<EL>(&base[offset]), alignment, atomic, order);
}
}
}
}
}
template<typename T>
inline void SIMD::Pointer::Store(RValue<T> val, OutOfBoundsBehavior robustness, Int mask, bool atomic /* = false */, std::memory_order order /* = std::memory_order_relaxed */)
{
Store(T(val), robustness, mask, atomic, order);
}
template<typename T>
inline rr::RValue<T> AndAll(rr::RValue<T> const &mask)
{
T v1 = mask; // [x] [y] [z] [w]
T v2 = v1.xzxz & v1.ywyw; // [xy] [zw] [xy] [zw]
return v2.xxxx & v2.yyyy; // [xyzw] [xyzw] [xyzw] [xyzw]
}
template<typename T>
inline rr::RValue<T> OrAll(rr::RValue<T> const &mask)
{
T v1 = mask; // [x] [y] [z] [w]
T v2 = v1.xzxz | v1.ywyw; // [xy] [zw] [xy] [zw]
return v2.xxxx | v2.yyyy; // [xyzw] [xyzw] [xyzw] [xyzw]
}
} // namespace sw
#ifdef ENABLE_RR_PRINT
namespace rr {
template<>
struct PrintValue::Ty<sw::Vector4f>
{
static std::string fmt(const sw::Vector4f &v)
{
return "[x: " + PrintValue::fmt(v.x) +
", y: " + PrintValue::fmt(v.y) +
", z: " + PrintValue::fmt(v.z) +
", w: " + PrintValue::fmt(v.w) + "]";
}
static std::vector<rr::Value *> val(const sw::Vector4f &v)
{
return PrintValue::vals(v.x, v.y, v.z, v.w);
}
};
template<>
struct PrintValue::Ty<sw::Vector4s>
{
static std::string fmt(const sw::Vector4s &v)
{
return "[x: " + PrintValue::fmt(v.x) +
", y: " + PrintValue::fmt(v.y) +
", z: " + PrintValue::fmt(v.z) +
", w: " + PrintValue::fmt(v.w) + "]";
}
static std::vector<rr::Value *> val(const sw::Vector4s &v)
{
return PrintValue::vals(v.x, v.y, v.z, v.w);
}
};
template<>
struct PrintValue::Ty<sw::SIMD::Pointer>
{
static std::string fmt(const sw::SIMD::Pointer &v)
{
return "{" + PrintValue::fmt(v.base) + " +" + PrintValue::fmt(v.offsets()) + "}";
}
static std::vector<rr::Value *> val(const sw::SIMD::Pointer &v)
{
return PrintValue::vals(v.base, v.offsets());
}
};
} // namespace rr
#endif // ENABLE_RR_PRINT
#endif // sw_ShaderCore_hpp