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Fix a crasher trying to fold each element in a comparison between two vectors

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if one of the vectors didn't have elements (such as undef). Fixes PR 6096.

Fix an issue in the constant folder where fcmp (<2 x %ty>, <2 x %ty>) would
have <2 x i1> type if constant folding was successful and i1 type if it wasn't.
This exposed a related issue in the bitcode reader.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94069 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2010-01-21 07:03:21 +00:00
parent 1548b863ce
commit 401f3258f6
4 changed files with 25 additions and 11 deletions
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2
lib/Bitcode/Reader/BitcodeReader.cpp
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@ -1167,7 +1167,7 @@ bool BitcodeReader::ParseConstants() {
Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy);
Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy);
if (OpTy->isFloatingPoint())
if (OpTy->isFPOrFPVector())
V = ConstantExpr::getFCmp(Record[3], Op0, Op1);
else
V = ConstantExpr::getICmp(Record[3], Op0, Op1);

5
lib/VMCore/ConstantFold.cpp
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@ -1673,14 +1673,15 @@ Constant *llvm::ConstantFoldCompareInstruction(LLVMContext &Context,
SmallVector<Constant*, 16> C1Elts, C2Elts;
C1->getVectorElements(Context, C1Elts);
C2->getVectorElements(Context, C2Elts);
if (C1Elts.empty() || C2Elts.empty())
return 0;
// If we can constant fold the comparison of each element, constant fold
// the whole vector comparison.
SmallVector<Constant*, 4> ResElts;
for (unsigned i = 0, e = C1Elts.size(); i != e; ++i) {
// Compare the elements, producing an i1 result or constant expr.
ResElts.push_back(
ConstantExpr::getCompare(pred, C1Elts[i], C2Elts[i]));
ResElts.push_back(ConstantExpr::getCompare(pred, C1Elts[i], C2Elts[i]));
}
return ConstantVector::get(&ResElts[0], ResElts.size());
}

20
lib/VMCore/Constants.cpp
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@ -1630,7 +1630,7 @@ Constant *ConstantExpr::getInBoundsGetElementPtr(Constant *C,
}
Constant *
ConstantExpr::getICmp(unsigned short pred, Constant* LHS, Constant* RHS) {
ConstantExpr::getICmp(unsigned short pred, Constant *LHS, Constant *RHS) {
assert(LHS->getType() == RHS->getType());
assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
@ -1646,13 +1646,16 @@ ConstantExpr::getICmp(unsigned short pred, Constant* LHS, Constant* RHS) {
// Get the key type with both the opcode and predicate
const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
const Type *ResultTy = Type::getInt1Ty(LHS->getContext());
if (const VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
ResultTy = VectorType::get(ResultTy, VT->getNumElements());
LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
return
pImpl->ExprConstants.getOrCreate(Type::getInt1Ty(LHS->getContext()), Key);
return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
}
Constant *
ConstantExpr::getFCmp(unsigned short pred, Constant* LHS, Constant* RHS) {
ConstantExpr::getFCmp(unsigned short pred, Constant *LHS, Constant *RHS) {
assert(LHS->getType() == RHS->getType());
assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
@ -1666,10 +1669,13 @@ ConstantExpr::getFCmp(unsigned short pred, Constant* LHS, Constant* RHS) {
ArgVec.push_back(RHS);
// Get the key type with both the opcode and predicate
const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
const Type *ResultTy = Type::getInt1Ty(LHS->getContext());
if (const VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
ResultTy = VectorType::get(ResultTy, VT->getNumElements());
LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
return
pImpl->ExprConstants.getOrCreate(Type::getInt1Ty(LHS->getContext()), Key);
return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
}
Constant *ConstantExpr::getExtractElementTy(const Type *ReqTy, Constant *Val,

9
test/Transforms/ConstProp/constant-expr.ll
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@ -57,4 +57,11 @@
@T4 = global i1* inttoptr (i64 trunc (i256 lshr (i256 or (i256 and (i256 and (i256 shl (i256 zext (i64 ptrtoint (i1* @B to i64) to i256), i256 64), i256 -6277101735386680763495507056286727952638980837032266301441), i256 6277101735386680763835789423207666416102355444464034512895), i256 shl (i256 zext (i64 ptrtoint (i1* @A to i64) to i256), i256 192)), i256 64) to i64) to i1*)
; CHECK: @T5 = global i1* @A
@T5 = global i1* inttoptr (i64 add (i64 trunc (i256 lshr (i256 or (i256 and (i256 and (i256 shl (i256 zext (i64 ptrtoint (i1* @B to i64) to i256), i256 64), i256 -6277101735386680763495507056286727952638980837032266301441), i256 6277101735386680763835789423207666416102355444464034512895), i256 shl (i256 zext (i64 ptrtoint (i1* @A to i64) to i256), i256 192)), i256 192) to i64), i64 trunc (i256 lshr (i256 or (i256 and (i256 and (i256 shl (i256 zext (i64 ptrtoint (i1* @B to i64) to i256), i256 64), i256 -6277101735386680763495507056286727952638980837032266301441), i256 6277101735386680763835789423207666416102355444464034512895), i256 shl (i256 zext (i64 ptrtoint (i1* @A to i64) to i256), i256 192)), i256 128) to i64)) to i1*)
@T5 = global i1* inttoptr (i64 add (i64 trunc (i256 lshr (i256 or (i256 and (i256 and (i256 shl (i256 zext (i64 ptrtoint (i1* @B to i64) to i256), i256 64), i256 -6277101735386680763495507056286727952638980837032266301441), i256 6277101735386680763835789423207666416102355444464034512895), i256 shl (i256 zext (i64 ptrtoint (i1* @A to i64) to i256), i256 192)), i256 192) to i64), i64 trunc (i256 lshr (i256 or (i256 and (i256 and (i256 shl (i256 zext (i64 ptrtoint (i1* @B to i64) to i256), i256 64), i256 -6277101735386680763495507056286727952638980837032266301441), i256 6277101735386680763835789423207666416102355444464034512895), i256 shl (i256 zext (i64 ptrtoint (i1* @A to i64) to i256), i256 192)), i256 128) to i64)) to i1*)
; PR6096
; No check line. This used to crash llvm-as.
@T6 = global <2 x i1> fcmp ole (<2 x float> fdiv (<2 x float> undef, <2 x float> <float 1.000000e+00, float 1.000000e+00>), <2 x float> zeroinitializer)