#include "llvm/Instructions.h"
#include "llvm/Intrinsics.h"
#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringMap.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
#include "llvm/Support/MathExtras.h"
// N = N + Offset
Offset += TD.getStructLayout(ST)->getElementOffset(CI->getZExtValue());
} else {
- const SequentialType *ST = cast<SequentialType>(*GTI);
- Offset += TD.getTypeSize(ST->getElementType())*CI->getSExtValue();
+ const SequentialType *SQT = cast<SequentialType>(*GTI);
+ Offset += TD.getTypeSize(SQT->getElementType())*CI->getSExtValue();
}
}
return true;
case Instruction::FCmp:
return ConstantExpr::getCompare(cast<CmpInst>(I)->getPredicate(), Ops[0],
Ops[1]);
+ case Instruction::PtrToInt:
+ // If the input is a inttoptr, eliminate the pair. This requires knowing
+ // the width of a pointer, so it can't be done in ConstantExpr::getCast.
+ if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ops[0])) {
+ if (TD && CE->getOpcode() == Instruction::IntToPtr) {
+ Constant *Input = CE->getOperand(0);
+ unsigned InWidth = Input->getType()->getPrimitiveSizeInBits();
+ Constant *Mask =
+ ConstantInt::get(APInt::getLowBitsSet(InWidth,
+ TD->getPointerSizeInBits()));
+ Input = ConstantExpr::getAnd(Input, Mask);
+ // Do a zext or trunc to get to the dest size.
+ return ConstantExpr::getIntegerCast(Input, I->getType(), false);
+ }
+ }
+ // FALL THROUGH.
+ case Instruction::IntToPtr:
case Instruction::Trunc:
case Instruction::ZExt:
case Instruction::SExt:
case Instruction::SIToFP:
case Instruction::FPToUI:
case Instruction::FPToSI:
- case Instruction::PtrToInt:
- case Instruction::IntToPtr:
case Instruction::BitCast:
return ConstantExpr::getCast(Opc, Ops[0], DestTy);
case Instruction::Select:
C = UndefValue::get(ATy->getElementType());
else
return 0;
- } else if (const PackedType *PTy = dyn_cast<PackedType>(*I)) {
+ } else if (const VectorType *PTy = dyn_cast<VectorType>(*I)) {
if (CI->getZExtValue() >= PTy->getNumElements())
return 0;
- if (ConstantPacked *CP = dyn_cast<ConstantPacked>(C))
+ if (ConstantVector *CP = dyn_cast<ConstantVector>(C))
C = CP->getOperand(CI->getZExtValue());
else if (isa<ConstantAggregateZero>(C))
C = Constant::getNullValue(PTy->getElementType());
/// the specified function.
bool
llvm::canConstantFoldCallTo(Function *F) {
- const std::string &Name = F->getName();
-
switch (F->getIntrinsicID()) {
case Intrinsic::sqrt_f32:
case Intrinsic::sqrt_f64:
- case Intrinsic::bswap_i16:
- case Intrinsic::bswap_i32:
- case Intrinsic::bswap_i64:
case Intrinsic::powi_f32:
case Intrinsic::powi_f64:
- // 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:
+ case Intrinsic::bswap:
+ case Intrinsic::ctpop:
+ case Intrinsic::ctlz:
+ case Intrinsic::cttz:
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;
+ const ValueName *NameVal = F->getValueName();
+ if (NameVal == 0) return false;
+ const char *Str = NameVal->getKeyData();
+ unsigned Len = NameVal->getKeyLength();
+
+ // In these cases, the check of the length is required. We don't want to
+ // return true for a name like "cos\0blah" which strcmp would return equal to
+ // "cos", but has length 8.
+ switch (Str[0]) {
+ default: return false;
+ case 'a':
+ if (Len == 4)
+ return !strcmp(Str, "acos") || !strcmp(Str, "asin") ||
+ !strcmp(Str, "atan");
+ else if (Len == 5)
+ return !strcmp(Str, "atan2");
+ return false;
+ case 'c':
+ if (Len == 3)
+ return !strcmp(Str, "cos");
+ else if (Len == 4)
+ return !strcmp(Str, "ceil") || !strcmp(Str, "cosf") ||
+ !strcmp(Str, "cosh");
+ return false;
+ case 'e':
+ if (Len == 3)
+ return !strcmp(Str, "exp");
+ return false;
+ case 'f':
+ if (Len == 4)
+ return !strcmp(Str, "fabs") || !strcmp(Str, "fmod");
+ else if (Len == 5)
+ return !strcmp(Str, "floor");
+ return false;
+ break;
+ case 'l':
+ if (Len == 3 && !strcmp(Str, "log"))
+ return true;
+ if (Len == 5 && !strcmp(Str, "log10"))
+ return true;
+ return false;
+ case 'p':
+ if (Len == 3 && !strcmp(Str, "pow"))
+ return true;
+ return false;
+ case 's':
+ if (Len == 3)
+ return !strcmp(Str, "sin");
+ if (Len == 4)
+ return !strcmp(Str, "sinh") || !strcmp(Str, "sqrt");
+ if (Len == 5)
+ return !strcmp(Str, "sqrtf");
+ return false;
+ case 't':
+ if (Len == 3 && !strcmp(Str, "tan"))
+ return true;
+ else if (Len == 4 && !strcmp(Str, "tanh"))
+ return true;
+ return false;
}
}
const Type *Ty) {
errno = 0;
V = NativeFP(V);
- if (errno == 0)
- return ConstantFP::get(Ty, V);
+ if (errno == 0) {
+ if (Ty==Type::FloatTy)
+ return ConstantFP::get(Ty, APFloat((float)V));
+ else if (Ty==Type::DoubleTy)
+ return ConstantFP::get(Ty, APFloat(V));
+ else
+ assert(0);
+ }
+ errno = 0;
+ return 0;
+}
+
+static Constant *ConstantFoldBinaryFP(double (*NativeFP)(double, double),
+ double V, double W,
+ const Type *Ty) {
+ errno = 0;
+ V = NativeFP(V, W);
+ if (errno == 0) {
+ if (Ty==Type::FloatTy)
+ return ConstantFP::get(Ty, APFloat((float)V));
+ else if (Ty==Type::DoubleTy)
+ return ConstantFP::get(Ty, APFloat(V));
+ else
+ assert(0);
+ }
errno = 0;
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, Constant** Operands, unsigned NumOperands) {
- const std::string &Name = F->getName();
+ const ValueName *NameVal = F->getValueName();
+ if (NameVal == 0) return 0;
+ const char *Str = NameVal->getKeyData();
+ unsigned Len = NameVal->getKeyLength();
+
const Type *Ty = F->getReturnType();
-
if (NumOperands == 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;
+ if (Ty!=Type::FloatTy && Ty!=Type::DoubleTy)
+ return 0;
+ /// Currently APFloat versions of these functions do not exist, so we use
+ /// the host native double versions. Float versions are not called
+ /// directly but for all these it is true (float)(f((double)arg)) ==
+ /// f(arg). Long double not supported yet.
+ double V = Ty==Type::FloatTy ? (double)Op->getValueAPF().convertToFloat():
+ Op->getValueAPF().convertToDouble();
+ switch (Str[0]) {
+ case 'a':
+ if (Len == 4 && !strcmp(Str, "acos"))
+ return ConstantFoldFP(acos, V, Ty);
+ else if (Len == 4 && !strcmp(Str, "asin"))
+ return ConstantFoldFP(asin, V, Ty);
+ else if (Len == 4 && !strcmp(Str, "atan"))
+ return ConstantFoldFP(atan, V, Ty);
+ break;
+ case 'c':
+ if (Len == 4 && !strcmp(Str, "ceil"))
+ return ConstantFoldFP(ceil, V, Ty);
+ else if (Len == 3 && !strcmp(Str, "cos"))
+ return ConstantFoldFP(cos, V, Ty);
+ else if (Len == 4 && !strcmp(Str, "cosh"))
+ return ConstantFoldFP(cosh, V, Ty);
+ break;
+ case 'e':
+ if (Len == 3 && !strcmp(Str, "exp"))
+ return ConstantFoldFP(exp, V, Ty);
+ break;
+ case 'f':
+ if (Len == 4 && !strcmp(Str, "fabs"))
+ return ConstantFoldFP(fabs, V, Ty);
+ else if (Len == 5 && !strcmp(Str, "floor"))
+ return ConstantFoldFP(floor, V, Ty);
+ break;
+ case 'l':
+ if (Len == 3 && !strcmp(Str, "log") && V > 0)
+ return ConstantFoldFP(log, V, Ty);
+ else if (Len == 5 && !strcmp(Str, "log10") && V > 0)
+ return ConstantFoldFP(log10, V, Ty);
+ else if (!strcmp(Str, "llvm.sqrt.f32") ||
+ !strcmp(Str, "llvm.sqrt.f64")) {
+ if (V >= -0.0)
+ return ConstantFoldFP(sqrt, V, Ty);
+ else // Undefined
+ return ConstantFP::get(Ty, Ty==Type::FloatTy ? APFloat(0.0f) :
+ APFloat(0.0));
+ }
+ break;
+ case 's':
+ if (Len == 3 && !strcmp(Str, "sin"))
+ return ConstantFoldFP(sin, V, Ty);
+ else if (Len == 4 && !strcmp(Str, "sinh"))
+ return ConstantFoldFP(sinh, V, Ty);
+ else if (Len == 4 && !strcmp(Str, "sqrt") && V >= 0)
+ return ConstantFoldFP(sqrt, V, Ty);
+ else if (Len == 5 && !strcmp(Str, "sqrtf") && V >= 0)
+ return ConstantFoldFP(sqrt, V, Ty);
+ break;
+ case 't':
+ if (Len == 3 && !strcmp(Str, "tan"))
+ return ConstantFoldFP(tan, V, Ty);
+ else if (Len == 4 && !strcmp(Str, "tanh"))
+ return ConstantFoldFP(tanh, V, Ty);
+ 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));
+ if (Len > 11 && !memcmp(Str, "llvm.bswap", 10)) {
+ return ConstantInt::get(Op->getValue().byteSwap());
+ } else if (Len > 11 && !memcmp(Str, "llvm.ctpop", 10)) {
+ uint64_t ctpop = Op->getValue().countPopulation();
+ return ConstantInt::get(Ty, ctpop);
+ } else if (Len > 10 && !memcmp(Str, "llvm.cttz", 9)) {
+ uint64_t cttz = Op->getValue().countTrailingZeros();
+ return ConstantInt::get(Ty, cttz);
+ } else if (Len > 10 && !memcmp(Str, "llvm.ctlz", 9)) {
+ uint64_t ctlz = Op->getValue().countLeadingZeros();
+ return ConstantInt::get(Ty, ctlz);
+ }
}
} else if (NumOperands == 2) {
if (ConstantFP *Op1 = dyn_cast<ConstantFP>(Operands[0])) {
- double Op1V = Op1->getValue();
+ double Op1V = Ty==Type::FloatTy ?
+ (double)Op1->getValueAPF().convertToFloat():
+ Op1->getValueAPF().convertToDouble();
if (ConstantFP *Op2 = dyn_cast<ConstantFP>(Operands[1])) {
- double Op2V = Op2->getValue();
+ if (Ty!=Type::FloatTy && Ty!=Type::DoubleTy)
+ return 0;
+ double Op2V = Ty==Type::FloatTy ?
+ (double)Op2->getValueAPF().convertToFloat():
+ Op2->getValueAPF().convertToDouble();
- 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));
+ if (Len == 3 && !strcmp(Str, "pow")) {
+ return ConstantFoldBinaryFP(pow, Op1V, Op2V, Ty);
+ } else if (Len == 4 && !strcmp(Str, "fmod")) {
+ return ConstantFoldBinaryFP(fmod, Op1V, Op2V, Ty);
+ } else if (Len == 5 && !strcmp(Str, "atan2")) {
+ return ConstantFoldBinaryFP(atan2, Op1V, Op2V, Ty);
}
} else if (ConstantInt *Op2C = dyn_cast<ConstantInt>(Operands[1])) {
- if (Name == "llvm.powi.f32") {
- return ConstantFP::get(Ty, std::pow((float)Op1V,
- (int)Op2C->getZExtValue()));
- } else if (Name == "llvm.powi.f64") {
- return ConstantFP::get(Ty, std::pow((double)Op1V,
- (int)Op2C->getZExtValue()));
+ if (!strcmp(Str, "llvm.powi.f32")) {
+ return ConstantFP::get(Ty, APFloat((float)std::pow((float)Op1V,
+ (int)Op2C->getZExtValue())));
+ } else if (!strcmp(Str, "llvm.powi.f64")) {
+ return ConstantFP::get(Ty, APFloat((double)std::pow((double)Op1V,
+ (int)Op2C->getZExtValue())));
}
}
}
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