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/*========================== begin_copyright_notice ============================
Copyright (C) 2018-2024 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#include "PacketBuilder.h"
// need to disable this to use INFINITY and NAN values
#pragma warning(disable : 4756 4056)
//#include <math.h>
namespace pktz {
//////////////////////////////////////////////////////////////////////////
/// @brief Computes log2(A) using either scalar log2 function from the runtime
/// or vector approximation
/// @param A - src float vector
Value *PacketBuilder::VLOG2PS(Value *A) {
Value *Result = nullptr;
// fast log2 approximation
// log2(x) = (x.ExpPart - 127) + log(1.xFracPart)
auto *AsInt = BITCAST(A, SimdInt32Ty);
auto *B = SUB(AND(ASHR(AsInt, 23), 255), VIMMED1(127));
auto *IntermResult = SI_TO_FP(B, SimdFP32Ty);
auto *Fa = OR(AND(AsInt, VIMMED1(0x007FFFFF)), VIMMED1(127 << 23));
Fa = BITCAST(Fa, SimdFP32Ty);
Fa = FSUB(Fa, VIMMED1(1.0f));
// log(x) = (1.4386183024320163f + (-0.640238532500937f +
// 0.20444600983623412f*fx)*fx)*fx;
Result = FMUL(Fa, VIMMED1(0.20444600983623412f));
Result = FADD(Result, VIMMED1(-0.640238532500937f));
Result = FMUL(Fa, Result);
Result = FADD(Result, VIMMED1(1.4386183024320163f));
Result = FMUL(Result, Fa);
Result = FADD(Result, IntermResult);
// handle bad input
// 0 -> -inf
auto *ZeroInput = FCMP_OEQ(A, VIMMED1(0.0f));
Result = SELECT(ZeroInput, VIMMED1(-INFINITY), Result);
// -F -> NAN
auto *NegInput = FCMP_OLT(A, VIMMED1(0.0f));
Result = SELECT(NegInput, VIMMED1(NAN), Result);
// inf -> inf
auto *InfInput = FCMP_OEQ(A, VIMMED1(INFINITY));
Result = SELECT(InfInput, VIMMED1(INFINITY), Result);
// NAN -> NAN
auto *NanInput = FCMP_UNO(A, A);
Result = SELECT(NanInput, VIMMED1(NAN), Result);
Result->setName("log2.");
return Result;
}
#define EXP_POLY_DEGREE 3
#define POLY0(x, c0) VIMMED1(c0)
#define POLY1(x, c0, c1) FADD(FMUL(POLY0(x, c1), x), VIMMED1(c0))
#define POLY2(x, c0, c1, c2) FADD(FMUL(POLY1(x, c1, c2), x), VIMMED1(c0))
#define POLY3(x, c0, c1, c2, c3) \
FADD(FMUL(POLY2(x, c1, c2, c3), x), VIMMED1(c0))
#define POLY4(x, c0, c1, c2, c3, c4) \
FADD(FMUL(POLY3(x, c1, c2, c3, c4), x), VIMMED1(c0))
#define POLY5(x, c0, c1, c2, c3, c4, c5) \
FADD(FMUL(POLY4(x, c1, c2, c3, c4, c5), x), VIMMED1(c0))
//////////////////////////////////////////////////////////////////////////
/// @brief Computes 2^A using either scalar pow function from the runtime
/// or vector approximation
/// @param A - src float vector
Value *PacketBuilder::VEXP2PS(Value *A) {
Value *Result = nullptr;
// fast exp2 taken from here:
// http://jrfonseca.blogspot.com/2008/09/fast-sse2-pow-tables-or-polynomials.html
A = VMINPS(A, VIMMED1(129.0f));
A = VMAXPS(A, VIMMED1(-126.99999f));
auto *IPart = FP_TO_SI(FSUB(A, VIMMED1(0.5f)), SimdInt32Ty);
auto *FPart = FSUB(A, SI_TO_FP(IPart, SimdFP32Ty));
auto *ExpIPart = BITCAST(SHL(ADD(IPart, VIMMED1(127)), 23), SimdFP32Ty);
#if EXP_POLY_DEGREE == 5
auto *ExpFPart = POLY5(FPart, 9.9999994e-1f, 6.9315308e-1f, 2.4015361e-1f,
5.5826318e-2f, 8.9893397e-3f, 1.8775767e-3f);
#elif EXP_POLY_DEGREE == 4
auto *ExpFPart = POLY4(FPart, 1.0000026f, 6.9300383e-1f, 2.4144275e-1f,
5.2011464e-2f, 1.3534167e-2f);
#elif EXP_POLY_DEGREE == 3
auto *ExpFPart =
POLY3(FPart, 9.9992520e-1f, 6.9583356e-1f, 2.2606716e-1f, 7.8024521e-2f);
#elif EXP_POLY_DEGREE == 2
auto *ExpFPart = POLY2(FPart, 1.0017247f, 6.5763628e-1f, 3.3718944e-1f);
#endif // EXP_POLY_DEGREE
Result = FMUL(ExpIPart, ExpFPart, "exp2.");
return Result;
}
Value *PacketBuilder::ADD(Value *LHS, Value *RHS, const Twine &Name,
bool HasNUW, bool HasNSW) {
return IRB->CreateAdd(LHS, RHS, Name, HasNUW, HasNSW);
}
Value *PacketBuilder::AND(Value *LHS, Value *RHS, const Twine &Name) {
return IRB->CreateAnd(LHS, RHS, Name);
}
Value *PacketBuilder::AND(Value *LHS, uint64_t RHS, const Twine &Name) {
return IRB->CreateAnd(LHS, RHS, Name);
}
Value *PacketBuilder::ASHR(Value *LHS, uint64_t RHS, const Twine &Name,
bool IsExact) {
return IRB->CreateAShr(LHS, RHS, Name, IsExact);
}
Value *PacketBuilder::EXP2(Value *A, const llvm::Twine &Name) {
SmallVector<Type *, 1> Args;
Args.push_back(A->getType());
auto *Decl = Intrinsic::getDeclaration(M, Intrinsic::exp2, Args);
return CALL(Decl, std::initializer_list<Value *>{A}, Name);
}
Value *PacketBuilder::FABS(Value *A, const llvm::Twine &Name) {
SmallVector<Type *, 1> Args;
Args.push_back(A->getType());
auto *Decl = Intrinsic::getDeclaration(M, Intrinsic::fabs, Args);
return CALL(Decl, std::initializer_list<Value *>{A}, Name);
}
Value *PacketBuilder::FADD(Value *LHS, Value *RHS, const Twine &Name,
MDNode *FPMathTag) {
return IRB->CreateFAdd(LHS, RHS, Name, FPMathTag);
}
Value *PacketBuilder::FCMP_OEQ(Value *LHS, Value *RHS, const Twine &Name,
MDNode *FPMathTag) {
return IRB->CreateFCmpOEQ(LHS, RHS, Name, FPMathTag);
}
Value *PacketBuilder::FCMP_OLT(Value *LHS, Value *RHS, const Twine &Name,
MDNode *FPMathTag) {
return IRB->CreateFCmpOLT(LHS, RHS, Name, FPMathTag);
}
Value *PacketBuilder::FCMP_UNO(Value *LHS, Value *RHS, const Twine &Name,
MDNode *FPMathTag) {
return IRB->CreateFCmpUNO(LHS, RHS, Name, FPMathTag);
}
Value *PacketBuilder::FMUL(Value *LHS, Value *RHS, const Twine &Name,
MDNode *FPMathTag) {
return IRB->CreateFMul(LHS, RHS, Name, FPMathTag);
}
Value *PacketBuilder::FP_TO_SI(Value *V, Type *DestTy, const Twine &Name) {
return IRB->CreateFPToSI(V, DestTy, Name);
}
Value *PacketBuilder::FSUB(Value *LHS, Value *RHS, const Twine &Name,
MDNode *FPMathTag) {
return IRB->CreateFSub(LHS, RHS, Name, FPMathTag);
}
Value *PacketBuilder::MUL(Value *LHS, Value *RHS, const Twine &Name,
bool HasNUW, bool HasNSW) {
return IRB->CreateMul(LHS, RHS, Name, HasNUW, HasNSW);
}
Value *PacketBuilder::NOT(Value *V, const Twine &Name) {
return IRB->CreateNot(V, Name);
}
Value *PacketBuilder::OR(Value *LHS, Value *RHS, const Twine &Name) {
return IRB->CreateOr(LHS, RHS, Name);
}
Value *PacketBuilder::SHL(Value *LHS, Value *RHS, const Twine &Name,
bool HasNUW, bool HasNSW) {
return IRB->CreateShl(LHS, RHS, Name, HasNUW, HasNSW);
}
Value *PacketBuilder::SHL(Value *LHS, uint64_t RHS, const Twine &Name,
bool HasNUW, bool HasNSW) {
return IRB->CreateShl(LHS, RHS, Name, HasNUW, HasNSW);
}
Value *PacketBuilder::SI_TO_FP(Value *V, Type *DestTy, const Twine &Name) {
return IRB->CreateSIToFP(V, DestTy, Name);
}
Value *PacketBuilder::SUB(Value *LHS, Value *RHS, const Twine &Name,
bool HasNUW, bool HasNSW) {
return IRB->CreateSub(LHS, RHS, Name, HasNUW, HasNSW);
}
Value *PacketBuilder::S_EXT(Value *V, Type *DestTy, const Twine &Name) {
return IRB->CreateSExt(V, DestTy, Name);
}
Value *PacketBuilder::TRUNC(Value *V, Type *DestTy, const Twine &Name) {
return IRB->CreateTrunc(V, DestTy, Name);
}
Value *PacketBuilder::VMINPS(Value *A, Value *B, const llvm::Twine &Name) {
SmallVector<Type *, 1> Args;
Args.push_back(A->getType());
auto *Decl = Intrinsic::getDeclaration(M, Intrinsic::minnum, Args);
return CALL(Decl, std::initializer_list<Value *>{A, B}, Name);
}
Value *PacketBuilder::VMAXPS(Value *A, Value *B, const llvm::Twine &Name) {
SmallVector<Type *, 1> Args;
Args.push_back(A->getType());
auto *Decl = Intrinsic::getDeclaration(M, Intrinsic::maxnum, Args);
return CALL(Decl, std::initializer_list<Value *>{A, B}, Name);
}
Value *PacketBuilder::VSQRTPS(Value *A, const llvm::Twine &Name) {
SmallVector<Type *, 1> Args;
Args.push_back(A->getType());
auto *Decl = Intrinsic::getDeclaration(M, Intrinsic::sqrt, Args);
return CALL(Decl, std::initializer_list<Value *>{A}, Name);
}
Value *PacketBuilder::UI_TO_FP(Value *V, Type *DestTy, const Twine &Name) {
return IRB->CreateUIToFP(V, DestTy, Name);
}
} // namespace pktz
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