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Add a new function to ConstantExpr - getAsInstruction. This returns its Instruction* corollary, which may be useful if a user
wishes to transform a ConstantExpr so that one of its operands is no longer constant. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168262 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
James Molloy
parent
9e6ee16b18
commit
b9478c2aef
@ -1076,6 +1076,16 @@ public:
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/// current one.
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Constant *getWithOperands(ArrayRef<Constant*> Ops, Type *Ty) const;
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/// getAsInstruction - Returns an Instruction which implements the same operation
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/// as this ConstantExpr. The instruction is not linked to any basic block.
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///
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/// A better approach to this could be to have a constructor for Instruction
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/// which would take a ConstantExpr parameter, but that would have spread
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/// implementation details of ConstantExpr outside of Constants.cpp, which
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/// would make it harded to remove ConstantExprs altogether
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/// (http://llvm.org/bugs/show_bug.cgi?id=10368).
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Instruction *getAsInstruction();
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virtual void destroyConstant();
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virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
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@ -2704,3 +2704,66 @@ void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
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// Delete the old constant!
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destroyConstant();
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}
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Instruction *ConstantExpr::getAsInstruction() {
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SmallVector<Value*,4> ValueOperands;
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for (op_iterator I = op_begin(), E = op_end(); I != E; ++I)
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ValueOperands.push_back(cast<Value>(I));
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ArrayRef<Value*> Ops(ValueOperands);
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switch (getOpcode()) {
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case Instruction::Trunc:
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case Instruction::ZExt:
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case Instruction::SExt:
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case Instruction::FPTrunc:
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case Instruction::FPExt:
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case Instruction::UIToFP:
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case Instruction::SIToFP:
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case Instruction::FPToUI:
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case Instruction::FPToSI:
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case Instruction::PtrToInt:
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case Instruction::IntToPtr:
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case Instruction::BitCast:
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return CastInst::Create((Instruction::CastOps)getOpcode(),
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Ops[0], getType());
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case Instruction::Select:
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return SelectInst::Create(Ops[0], Ops[1], Ops[2]);
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case Instruction::InsertElement:
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return InsertElementInst::Create(Ops[0], Ops[1], Ops[2]);
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case Instruction::ExtractElement:
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return ExtractElementInst::Create(Ops[0], Ops[1]);
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case Instruction::InsertValue:
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return InsertValueInst::Create(Ops[0], Ops[1], getIndices());
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case Instruction::ExtractValue:
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return ExtractValueInst::Create(Ops[0], getIndices());
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case Instruction::ShuffleVector:
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return new ShuffleVectorInst(Ops[0], Ops[1], Ops[2]);
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case Instruction::GetElementPtr:
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if (cast<GEPOperator>(this)->isInBounds())
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return GetElementPtrInst::CreateInBounds(Ops[0], Ops.slice(1));
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else
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return GetElementPtrInst::Create(Ops[0], Ops.slice(1));
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case Instruction::ICmp:
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case Instruction::FCmp:
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return CmpInst::Create((Instruction::OtherOps)getOpcode(),
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getPredicate(), Ops[0], Ops[1]);
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default:
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assert(getNumOperands() == 2 && "Must be binary operator?");
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BinaryOperator *BO =
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BinaryOperator::Create((Instruction::BinaryOps)getOpcode(),
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Ops[0], Ops[1]);
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if (isa<OverflowingBinaryOperator>(BO)) {
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BO->setHasNoUnsignedWrap(SubclassOptionalData &
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OverflowingBinaryOperator::NoUnsignedWrap);
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BO->setHasNoSignedWrap(SubclassOptionalData &
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OverflowingBinaryOperator::NoSignedWrap);
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}
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if (isa<PossiblyExactOperator>(BO))
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BO->setIsExact(SubclassOptionalData & PossiblyExactOperator::IsExact);
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return BO;
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}
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}
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@ -8,8 +8,11 @@
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//===----------------------------------------------------------------------===//
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#include "llvm/Constants.h"
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#include "llvm/Instruction.h"
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#include "llvm/InstrTypes.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/LLVMContext.h"
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#include "llvm/Module.h"
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#include "gtest/gtest.h"
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namespace llvm {
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@ -118,5 +121,108 @@ TEST(ConstantsTest, FP128Test) {
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EXPECT_TRUE(isa<ConstantFP>(X));
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}
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#define CHECK(x, y) { \
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std::string __s; \
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raw_string_ostream __o(__s); \
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cast<ConstantExpr>(x)->getAsInstruction()->print(__o); \
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__o.flush(); \
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EXPECT_EQ(std::string(" <badref> = " y), __s); \
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}
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TEST(ConstantsTest, AsInstructionsTest) {
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Module *M = new Module("MyModule", getGlobalContext());
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Type *Int64Ty = Type::getInt64Ty(getGlobalContext());
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Type *Int32Ty = Type::getInt32Ty(getGlobalContext());
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Type *Int16Ty = Type::getInt16Ty(getGlobalContext());
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Type *Int1Ty = Type::getInt1Ty(getGlobalContext());
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Type *FloatTy = Type::getFloatTy(getGlobalContext());
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Type *DoubleTy = Type::getDoubleTy(getGlobalContext());
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Constant *Global = M->getOrInsertGlobal("dummy",
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PointerType::getUnqual(Int32Ty));
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Constant *Global2 = M->getOrInsertGlobal("dummy2",
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PointerType::getUnqual(Int32Ty));
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Constant *P0 = ConstantExpr::getPtrToInt(Global, Int32Ty);
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Constant *P1 = ConstantExpr::getUIToFP(P0, FloatTy);
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Constant *P2 = ConstantExpr::getUIToFP(P0, DoubleTy);
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Constant *P3 = ConstantExpr::getTrunc(P0, Int1Ty);
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Constant *P4 = ConstantExpr::getPtrToInt(Global2, Int32Ty);
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Constant *P5 = ConstantExpr::getUIToFP(P4, FloatTy);
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Constant *P6 = ConstantExpr::getBitCast(P4, VectorType::get(Int16Ty, 2));
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Constant *One = ConstantInt::get(Int32Ty, 1);
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#define P0STR "ptrtoint (i32** @dummy to i32)"
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#define P1STR "uitofp (i32 ptrtoint (i32** @dummy to i32) to float)"
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#define P2STR "uitofp (i32 ptrtoint (i32** @dummy to i32) to double)"
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#define P3STR "ptrtoint (i32** @dummy to i1)"
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#define P4STR "ptrtoint (i32** @dummy2 to i32)"
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#define P5STR "uitofp (i32 ptrtoint (i32** @dummy2 to i32) to float)"
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#define P6STR "bitcast (i32 ptrtoint (i32** @dummy2 to i32) to <2 x i16>)"
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CHECK(ConstantExpr::getNeg(P0), "sub i32 0, " P0STR);
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CHECK(ConstantExpr::getFNeg(P1), "fsub float -0.000000e+00, " P1STR);
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CHECK(ConstantExpr::getNot(P0), "xor i32 " P0STR ", -1");
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CHECK(ConstantExpr::getAdd(P0, P0), "add i32 " P0STR ", " P0STR);
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CHECK(ConstantExpr::getAdd(P0, P0, false, true), "add nsw i32 " P0STR ", "
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P0STR);
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CHECK(ConstantExpr::getAdd(P0, P0, true, true), "add nuw nsw i32 " P0STR ", "
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P0STR);
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CHECK(ConstantExpr::getFAdd(P1, P1), "fadd float " P1STR ", " P1STR);
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CHECK(ConstantExpr::getSub(P0, P0), "sub i32 " P0STR ", " P0STR);
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CHECK(ConstantExpr::getFSub(P1, P1), "fsub float " P1STR ", " P1STR);
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CHECK(ConstantExpr::getMul(P0, P0), "mul i32 " P0STR ", " P0STR);
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CHECK(ConstantExpr::getFMul(P1, P1), "fmul float " P1STR ", " P1STR);
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CHECK(ConstantExpr::getUDiv(P0, P0), "udiv i32 " P0STR ", " P0STR);
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CHECK(ConstantExpr::getSDiv(P0, P0), "sdiv i32 " P0STR ", " P0STR);
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CHECK(ConstantExpr::getFDiv(P1, P1), "fdiv float " P1STR ", " P1STR);
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CHECK(ConstantExpr::getURem(P0, P0), "urem i32 " P0STR ", " P0STR);
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CHECK(ConstantExpr::getSRem(P0, P0), "srem i32 " P0STR ", " P0STR);
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CHECK(ConstantExpr::getFRem(P1, P1), "frem float " P1STR ", " P1STR);
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CHECK(ConstantExpr::getAnd(P0, P0), "and i32 " P0STR ", " P0STR);
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CHECK(ConstantExpr::getOr(P0, P0), "or i32 " P0STR ", " P0STR);
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CHECK(ConstantExpr::getXor(P0, P0), "xor i32 " P0STR ", " P0STR);
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CHECK(ConstantExpr::getShl(P0, P0), "shl i32 " P0STR ", " P0STR);
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CHECK(ConstantExpr::getShl(P0, P0, true), "shl nuw i32 " P0STR ", " P0STR);
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CHECK(ConstantExpr::getShl(P0, P0, false, true), "shl nsw i32 " P0STR ", "
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P0STR);
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CHECK(ConstantExpr::getLShr(P0, P0, false), "lshr i32 " P0STR ", " P0STR);
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CHECK(ConstantExpr::getLShr(P0, P0, true), "lshr exact i32 " P0STR ", " P0STR);
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CHECK(ConstantExpr::getAShr(P0, P0, false), "ashr i32 " P0STR ", " P0STR);
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CHECK(ConstantExpr::getAShr(P0, P0, true), "ashr exact i32 " P0STR ", " P0STR);
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CHECK(ConstantExpr::getSExt(P0, Int64Ty), "sext i32 " P0STR " to i64");
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CHECK(ConstantExpr::getZExt(P0, Int64Ty), "zext i32 " P0STR " to i64");
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CHECK(ConstantExpr::getFPTrunc(P2, FloatTy), "fptrunc double " P2STR
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" to float");
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CHECK(ConstantExpr::getFPExtend(P1, DoubleTy), "fpext float " P1STR
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" to double");
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CHECK(ConstantExpr::getExactUDiv(P0, P0), "udiv exact i32 " P0STR ", " P0STR);
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CHECK(ConstantExpr::getSelect(P3, P0, P4), "select i1 " P3STR ", i32 " P0STR
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", i32 " P4STR);
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CHECK(ConstantExpr::getICmp(CmpInst::ICMP_EQ, P0, P4), "icmp eq i32 " P0STR
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", " P4STR);
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CHECK(ConstantExpr::getFCmp(CmpInst::FCMP_ULT, P1, P5), "fcmp ult float "
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P1STR ", " P5STR);
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std::vector<Constant*> V;
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V.push_back(One);
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// FIXME: getGetElementPtr() actually creates an inbounds ConstantGEP,
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// not a normal one!
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//CHECK(ConstantExpr::getGetElementPtr(Global, V, false),
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// "getelementptr i32** @dummy, i32 1");
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CHECK(ConstantExpr::getInBoundsGetElementPtr(Global, V),
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"getelementptr inbounds i32** @dummy, i32 1");
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CHECK(ConstantExpr::getExtractElement(P6, One), "extractelement <2 x i16> "
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P6STR ", i32 1");
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}
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#undef CHECK
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} // end anonymous namespace
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} // end namespace llvm
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