mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-26 21:32:10 +00:00
c5b206b6be
This patch replaces signed integer types with signless ones: 1. [US]Byte -> Int8 2. [U]Short -> Int16 3. [U]Int -> Int32 4. [U]Long -> Int64. 5. Removal of isSigned, isUnsigned, getSignedVersion, getUnsignedVersion and other methods related to signedness. In a few places this warranted identifying the signedness information from other sources. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32785 91177308-0d34-0410-b5e6-96231b3b80d8
202 lines
6.3 KiB
C++
202 lines
6.3 KiB
C++
//===-- ConstantFolding.cpp - Analyze constant folding possibilities ------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by the LLVM research group and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This family of functions determines the possibility of performing constant
|
|
// folding.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Analysis/ConstantFolding.h"
|
|
#include "llvm/Constants.h"
|
|
#include "llvm/DerivedTypes.h"
|
|
#include "llvm/Instructions.h"
|
|
#include "llvm/Intrinsics.h"
|
|
#include "llvm/Support/GetElementPtrTypeIterator.h"
|
|
#include "llvm/Support/MathExtras.h"
|
|
#include <cerrno>
|
|
#include <cmath>
|
|
using namespace llvm;
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Constant Folding ...
|
|
//
|
|
|
|
|
|
/// canConstantFoldCallTo - Return true if its even possible to fold a call to
|
|
/// the specified function.
|
|
bool
|
|
llvm::canConstantFoldCallTo(Function *F) {
|
|
const std::string &Name = F->getName();
|
|
|
|
switch (F->getIntrinsicID()) {
|
|
case Intrinsic::isunordered_f32:
|
|
case Intrinsic::isunordered_f64:
|
|
case Intrinsic::sqrt_f32:
|
|
case Intrinsic::sqrt_f64:
|
|
case Intrinsic::bswap_i16:
|
|
case Intrinsic::bswap_i32:
|
|
case Intrinsic::bswap_i64:
|
|
// FIXME: these should be constant folded as well
|
|
//case Intrinsic::ctpop_i8:
|
|
//case Intrinsic::ctpop_i16:
|
|
//case Intrinsic::ctpop_i32:
|
|
//case Intrinsic::ctpop_i64:
|
|
//case Intrinsic::ctlz_i8:
|
|
//case Intrinsic::ctlz_i16:
|
|
//case Intrinsic::ctlz_i32:
|
|
//case Intrinsic::ctlz_i64:
|
|
//case Intrinsic::cttz_i8:
|
|
//case Intrinsic::cttz_i16:
|
|
//case Intrinsic::cttz_i32:
|
|
//case Intrinsic::cttz_i64:
|
|
return true;
|
|
default: break;
|
|
}
|
|
|
|
switch (Name[0])
|
|
{
|
|
case 'a':
|
|
return Name == "acos" || Name == "asin" || Name == "atan" ||
|
|
Name == "atan2";
|
|
case 'c':
|
|
return Name == "ceil" || Name == "cos" || Name == "cosf" ||
|
|
Name == "cosh";
|
|
case 'e':
|
|
return Name == "exp";
|
|
case 'f':
|
|
return Name == "fabs" || Name == "fmod" || Name == "floor";
|
|
case 'l':
|
|
return Name == "log" || Name == "log10";
|
|
case 'p':
|
|
return Name == "pow";
|
|
case 's':
|
|
return Name == "sin" || Name == "sinh" ||
|
|
Name == "sqrt" || Name == "sqrtf";
|
|
case 't':
|
|
return Name == "tan" || Name == "tanh";
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
Constant *
|
|
llvm::ConstantFoldFP(double (*NativeFP)(double), double V, const Type *Ty) {
|
|
errno = 0;
|
|
V = NativeFP(V);
|
|
if (errno == 0)
|
|
return ConstantFP::get(Ty, V);
|
|
return 0;
|
|
}
|
|
|
|
/// ConstantFoldCall - Attempt to constant fold a call to the specified function
|
|
/// with the specified arguments, returning null if unsuccessful.
|
|
Constant *
|
|
llvm::ConstantFoldCall(Function *F, const std::vector<Constant*> &Operands) {
|
|
const std::string &Name = F->getName();
|
|
const Type *Ty = F->getReturnType();
|
|
|
|
if (Operands.size() == 1) {
|
|
if (ConstantFP *Op = dyn_cast<ConstantFP>(Operands[0])) {
|
|
double V = Op->getValue();
|
|
switch (Name[0])
|
|
{
|
|
case 'a':
|
|
if (Name == "acos")
|
|
return ConstantFoldFP(acos, V, Ty);
|
|
else if (Name == "asin")
|
|
return ConstantFoldFP(asin, V, Ty);
|
|
else if (Name == "atan")
|
|
return ConstantFP::get(Ty, atan(V));
|
|
break;
|
|
case 'c':
|
|
if (Name == "ceil")
|
|
return ConstantFoldFP(ceil, V, Ty);
|
|
else if (Name == "cos")
|
|
return ConstantFP::get(Ty, cos(V));
|
|
else if (Name == "cosh")
|
|
return ConstantFP::get(Ty, cosh(V));
|
|
break;
|
|
case 'e':
|
|
if (Name == "exp")
|
|
return ConstantFP::get(Ty, exp(V));
|
|
break;
|
|
case 'f':
|
|
if (Name == "fabs")
|
|
return ConstantFP::get(Ty, fabs(V));
|
|
else if (Name == "floor")
|
|
return ConstantFoldFP(floor, V, Ty);
|
|
break;
|
|
case 'l':
|
|
if (Name == "log" && V > 0)
|
|
return ConstantFP::get(Ty, log(V));
|
|
else if (Name == "log10" && V > 0)
|
|
return ConstantFoldFP(log10, V, Ty);
|
|
else if (Name == "llvm.sqrt.f32" || Name == "llvm.sqrt.f64") {
|
|
if (V >= -0.0)
|
|
return ConstantFP::get(Ty, sqrt(V));
|
|
else // Undefined
|
|
return ConstantFP::get(Ty, 0.0);
|
|
}
|
|
break;
|
|
case 's':
|
|
if (Name == "sin")
|
|
return ConstantFP::get(Ty, sin(V));
|
|
else if (Name == "sinh")
|
|
return ConstantFP::get(Ty, sinh(V));
|
|
else if (Name == "sqrt" && V >= 0)
|
|
return ConstantFP::get(Ty, sqrt(V));
|
|
else if (Name == "sqrtf" && V >= 0)
|
|
return ConstantFP::get(Ty, sqrt((float)V));
|
|
break;
|
|
case 't':
|
|
if (Name == "tan")
|
|
return ConstantFP::get(Ty, tan(V));
|
|
else if (Name == "tanh")
|
|
return ConstantFP::get(Ty, tanh(V));
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
} else if (ConstantInt *Op = dyn_cast<ConstantInt>(Operands[0])) {
|
|
uint64_t V = Op->getZExtValue();
|
|
if (Name == "llvm.bswap.i16")
|
|
return ConstantInt::get(Ty, ByteSwap_16(V));
|
|
else if (Name == "llvm.bswap.i32")
|
|
return ConstantInt::get(Ty, ByteSwap_32(V));
|
|
else if (Name == "llvm.bswap.i64")
|
|
return ConstantInt::get(Ty, ByteSwap_64(V));
|
|
}
|
|
} else if (Operands.size() == 2) {
|
|
if (ConstantFP *Op1 = dyn_cast<ConstantFP>(Operands[0])) {
|
|
double Op1V = Op1->getValue();
|
|
if (ConstantFP *Op2 = dyn_cast<ConstantFP>(Operands[1])) {
|
|
double Op2V = Op2->getValue();
|
|
|
|
if (Name == "llvm.isunordered.f32" || Name == "llvm.isunordered.f64")
|
|
return ConstantBool::get(IsNAN(Op1V) || IsNAN(Op2V));
|
|
else
|
|
if (Name == "pow") {
|
|
errno = 0;
|
|
double V = pow(Op1V, Op2V);
|
|
if (errno == 0)
|
|
return ConstantFP::get(Ty, V);
|
|
} else if (Name == "fmod") {
|
|
errno = 0;
|
|
double V = fmod(Op1V, Op2V);
|
|
if (errno == 0)
|
|
return ConstantFP::get(Ty, V);
|
|
} else if (Name == "atan2")
|
|
return ConstantFP::get(Ty, atan2(Op1V,Op2V));
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|