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This patch implements the first increment for the Signless Types feature. All changes pertain to removing the ConstantSInt and ConstantUInt classes in favor of just using ConstantInt. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31063 91177308-0d34-0410-b5e6-96231b3b80d8
203 lines
6.3 KiB
C++
203 lines
6.3 KiB
C++
//===-- ConstantFolding.cpp - Analyze constant folding possibilities ------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This family of functions determines the possibility of performing constant
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// folding.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/ConstantFolding.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Instructions.h"
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#include "llvm/Intrinsics.h"
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#include "llvm/Support/GetElementPtrTypeIterator.h"
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#include "llvm/Support/MathExtras.h"
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#include <cerrno>
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#include <cmath>
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// Constant Folding ...
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//
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/// canConstantFoldCallTo - Return true if its even possible to fold a call to
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/// the specified function.
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bool
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llvm::canConstantFoldCallTo(Function *F) {
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const std::string &Name = F->getName();
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switch (F->getIntrinsicID()) {
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case Intrinsic::isunordered_f32:
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case Intrinsic::isunordered_f64:
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case Intrinsic::sqrt_f32:
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case Intrinsic::sqrt_f64:
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case Intrinsic::bswap_i16:
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case Intrinsic::bswap_i32:
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case Intrinsic::bswap_i64:
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// FIXME: these should be constant folded as well
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//case Intrinsic::ctpop_i8:
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//case Intrinsic::ctpop_i16:
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//case Intrinsic::ctpop_i32:
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//case Intrinsic::ctpop_i64:
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//case Intrinsic::ctlz_i8:
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//case Intrinsic::ctlz_i16:
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//case Intrinsic::ctlz_i32:
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//case Intrinsic::ctlz_i64:
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//case Intrinsic::cttz_i8:
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//case Intrinsic::cttz_i16:
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//case Intrinsic::cttz_i32:
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//case Intrinsic::cttz_i64:
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return true;
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default: break;
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}
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switch (Name[0])
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{
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case 'a':
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return Name == "acos" || Name == "asin" || Name == "atan" ||
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Name == "atan2";
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case 'c':
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return Name == "ceil" || Name == "cos" || Name == "cosf" ||
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Name == "cosh";
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case 'e':
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return Name == "exp";
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case 'f':
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return Name == "fabs" || Name == "fmod" || Name == "floor";
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case 'l':
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return Name == "log" || Name == "log10";
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case 'p':
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return Name == "pow";
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case 's':
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return Name == "sin" || Name == "sinh" ||
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Name == "sqrt" || Name == "sqrtf";
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case 't':
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return Name == "tan" || Name == "tanh";
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default:
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return false;
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}
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}
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Constant *
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llvm::ConstantFoldFP(double (*NativeFP)(double), double V, const Type *Ty) {
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errno = 0;
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V = NativeFP(V);
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if (errno == 0)
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return ConstantFP::get(Ty, V);
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return 0;
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}
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/// ConstantFoldCall - Attempt to constant fold a call to the specified function
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/// with the specified arguments, returning null if unsuccessful.
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Constant *
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llvm::ConstantFoldCall(Function *F, const std::vector<Constant*> &Operands) {
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const std::string &Name = F->getName();
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const Type *Ty = F->getReturnType();
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if (Operands.size() == 1) {
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if (ConstantFP *Op = dyn_cast<ConstantFP>(Operands[0])) {
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double V = Op->getValue();
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switch (Name[0])
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{
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case 'a':
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if (Name == "acos")
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return ConstantFoldFP(acos, V, Ty);
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else if (Name == "asin")
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return ConstantFoldFP(asin, V, Ty);
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else if (Name == "atan")
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return ConstantFP::get(Ty, atan(V));
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break;
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case 'c':
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if (Name == "ceil")
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return ConstantFoldFP(ceil, V, Ty);
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else if (Name == "cos")
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return ConstantFP::get(Ty, cos(V));
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else if (Name == "cosh")
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return ConstantFP::get(Ty, cosh(V));
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break;
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case 'e':
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if (Name == "exp")
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return ConstantFP::get(Ty, exp(V));
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break;
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case 'f':
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if (Name == "fabs")
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return ConstantFP::get(Ty, fabs(V));
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else if (Name == "floor")
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return ConstantFoldFP(floor, V, Ty);
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break;
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case 'l':
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if (Name == "log" && V > 0)
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return ConstantFP::get(Ty, log(V));
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else if (Name == "log10" && V > 0)
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return ConstantFoldFP(log10, V, Ty);
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else if (Name == "llvm.sqrt.f32" || Name == "llvm.sqrt.f64") {
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if (V >= -0.0)
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return ConstantFP::get(Ty, sqrt(V));
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else // Undefined
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return ConstantFP::get(Ty, 0.0);
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}
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break;
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case 's':
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if (Name == "sin")
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return ConstantFP::get(Ty, sin(V));
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else if (Name == "sinh")
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return ConstantFP::get(Ty, sinh(V));
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else if (Name == "sqrt" && V >= 0)
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return ConstantFP::get(Ty, sqrt(V));
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else if (Name == "sqrtf" && V >= 0)
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return ConstantFP::get(Ty, sqrt((float)V));
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break;
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case 't':
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if (Name == "tan")
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return ConstantFP::get(Ty, tan(V));
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else if (Name == "tanh")
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return ConstantFP::get(Ty, tanh(V));
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break;
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default:
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break;
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}
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} else if (ConstantInt *Op = dyn_cast<ConstantInt>(Operands[0])) {
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assert(Op->getType()->isUnsigned() && "bswap args must be unsigned");
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uint64_t V = Op->getZExtValue();
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if (Name == "llvm.bswap.i16")
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return ConstantInt::get(Ty, ByteSwap_16(V));
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else if (Name == "llvm.bswap.i32")
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return ConstantInt::get(Ty, ByteSwap_32(V));
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else if (Name == "llvm.bswap.i64")
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return ConstantInt::get(Ty, ByteSwap_64(V));
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}
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} else if (Operands.size() == 2) {
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if (ConstantFP *Op1 = dyn_cast<ConstantFP>(Operands[0])) {
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double Op1V = Op1->getValue();
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if (ConstantFP *Op2 = dyn_cast<ConstantFP>(Operands[1])) {
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double Op2V = Op2->getValue();
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if (Name == "llvm.isunordered.f32" || Name == "llvm.isunordered.f64")
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return ConstantBool::get(IsNAN(Op1V) || IsNAN(Op2V));
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else
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if (Name == "pow") {
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errno = 0;
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double V = pow(Op1V, Op2V);
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if (errno == 0)
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return ConstantFP::get(Ty, V);
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} else if (Name == "fmod") {
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errno = 0;
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double V = fmod(Op1V, Op2V);
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if (errno == 0)
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return ConstantFP::get(Ty, V);
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} else if (Name == "atan2")
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return ConstantFP::get(Ty, atan2(Op1V,Op2V));
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}
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}
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}
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return 0;
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}
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