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#include "instructions.h"
#include <llvm/CallingConv.h>
#include <llvm/Constants.h>
#include <llvm/DerivedTypes.h>
#include <llvm/InstrTypes.h>
#include <llvm/Instructions.h>
using namespace llvm;
Instructions::Instructions(llvm::Module *mod, llvm::BasicBlock *block)
: m_mod(mod), m_block(block), m_idx(0)
{
m_floatVecType = VectorType::get(Type::FloatTy, 4);
m_llvmFSqrt = 0;
m_llvmFAbs = 0;
}
llvm::Value * Instructions::add(llvm::Value *in1, llvm::Value *in2)
{
BinaryOperator *res = BinaryOperator::create(Instruction::Add, in1, in2,
name("add"),
m_block);
return res;
}
llvm::Value * Instructions::madd(llvm::Value *in1, llvm::Value *in2,
llvm::Value *in3)
{
Value *mulRes = mul(in1, in2);
return add(mulRes, in3);
}
llvm::Value * Instructions::mul(llvm::Value *in1, llvm::Value *in2)
{
BinaryOperator *res = BinaryOperator::create(Instruction::Mul, in1, in2,
name("mul"),
m_block);
return res;
}
const char * Instructions::name(const char *prefix)
{
++m_idx;
snprintf(m_name, 32, "%s%d", prefix, m_idx);
return m_name;
}
llvm::Value * Instructions::dp3(llvm::Value *in1, llvm::Value *in2)
{
Value *mulRes = mul(in1, in2);
ExtractElementInst *x = new ExtractElementInst(mulRes, unsigned(0),
name("extractx"),
m_block);
ExtractElementInst *y = new ExtractElementInst(mulRes, unsigned(1),
name("extracty"),
m_block);
ExtractElementInst *z = new ExtractElementInst(mulRes, unsigned(2),
name("extractz"),
m_block);
BinaryOperator *xy = BinaryOperator::create(Instruction::Add, x, y,
name("xy"),
m_block);
BinaryOperator *dot3 = BinaryOperator::create(Instruction::Add, xy, z,
name("dot3"),
m_block);
return vectorFromVals(dot3, dot3, dot3, dot3);
}
llvm::Value *Instructions::callFSqrt(llvm::Value *val)
{
if (!m_llvmFSqrt) {
// predeclare the intrinsic
std::vector<const Type*> fsqrtArgs;
fsqrtArgs.push_back(Type::FloatTy);
ParamAttrsList *fsqrtPal = 0;
FunctionType* fsqrtType = FunctionType::get(
/*Result=*/Type::FloatTy,
/*Params=*/fsqrtArgs,
/*isVarArg=*/false,
/*ParamAttrs=*/fsqrtPal);
m_llvmFSqrt = new Function(
/*Type=*/fsqrtType,
/*Linkage=*/GlobalValue::ExternalLinkage,
/*Name=*/"llvm.sqrt.f32", m_mod);
m_llvmFSqrt->setCallingConv(CallingConv::C);
}
CallInst *call = new CallInst(m_llvmFSqrt, val,
name("sqrt"),
m_block);
call->setCallingConv(CallingConv::C);
call->setTailCall(false);
return call;
}
llvm::Value * Instructions::rsq(llvm::Value *in1)
{
ExtractElementInst *x = new ExtractElementInst(in1, unsigned(0),
name("extractx"),
m_block);
Value *abs = callFAbs(x);
Value *sqrt = callFSqrt(abs);
BinaryOperator *rsqrt = BinaryOperator::create(Instruction::FDiv,
ConstantFP::get(Type::FloatTy,
APFloat(1.f)),
sqrt,
name("rsqrt"),
m_block);
return vectorFromVals(rsqrt, rsqrt, rsqrt, rsqrt);
}
llvm::Value * Instructions::vectorFromVals(llvm::Value *x, llvm::Value *y,
llvm::Value *z, llvm::Value *w)
{
Constant *const_vec = Constant::getNullValue(m_floatVecType);
InsertElementInst *res = new InsertElementInst(const_vec, x, unsigned(0),
name("vecx"), m_block);
res = new InsertElementInst(res, y, unsigned(1),
name("vecxy"),
m_block);
res = new InsertElementInst(res, z, unsigned(2),
name("vecxyz"),
m_block);
if (w)
res = new InsertElementInst(res, w, unsigned(3),
name("vecxyw"),
m_block);
return res;
}
llvm::Value *Instructions::callFAbs(llvm::Value *val)
{
if (!m_llvmFAbs) {
// predeclare the intrinsic
std::vector<const Type*> fabsArgs;
fabsArgs.push_back(Type::FloatTy);
ParamAttrsList *fabsPal = 0;
FunctionType* fabsType = FunctionType::get(
/*Result=*/Type::FloatTy,
/*Params=*/fabsArgs,
/*isVarArg=*/false,
/*ParamAttrs=*/fabsPal);
m_llvmFAbs = new Function(
/*Type=*/fabsType,
/*Linkage=*/GlobalValue::ExternalLinkage,
/*Name=*/"fabs", m_mod);
m_llvmFAbs->setCallingConv(CallingConv::C);
}
CallInst *call = new CallInst(m_llvmFAbs, val,
name("fabs"),
m_block);
call->setCallingConv(CallingConv::C);
call->setTailCall(false);
return call;
}
llvm::Value * Instructions::lit(llvm::Value *in1)
{
return in1;
}
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