diff options
| author | Nick Lewycky <nicholas@mxc.ca> | 2011-01-21 01:12:09 +0000 |
|---|---|---|
| committer | Nick Lewycky <nicholas@mxc.ca> | 2011-01-21 01:12:09 +0000 |
| commit | 4c93a0f09225b428fb0f28f1c540f5ff5dd5bb3c (patch) | |
| tree | adcd0a36f1b75ca7cabd111eb8bc72d38824ecfe /lib/VMCore/ConstantFold.cpp | |
| parent | d7e3cc840b81b0438e47f05d9664137a198876df (diff) | |
Add a constant folding of casts from zero to zero. Fixes PR9011!
While here, I'd like to complain about how vector is not an aggregate type
according to llvm::Type::isAggregateType(), but they're listed under aggregate
types in the LangRef and zero vectors are stored as ConstantAggregateZero.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123956 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/VMCore/ConstantFold.cpp')
| -rw-r--r-- | lib/VMCore/ConstantFold.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/VMCore/ConstantFold.cpp b/lib/VMCore/ConstantFold.cpp index a21b4a28e4..3fea1910ff 100644 --- a/lib/VMCore/ConstantFold.cpp +++ b/lib/VMCore/ConstantFold.cpp @@ -511,10 +511,14 @@ Constant *llvm::ConstantFoldCastInstruction(unsigned opc, Constant *V, return Constant::getNullValue(DestTy); return UndefValue::get(DestTy); } + // No compile-time operations on this type yet. if (V->getType()->isPPC_FP128Ty() || DestTy->isPPC_FP128Ty()) return 0; + if (V->isNullValue() && !DestTy->isX86_MMXTy()) + return Constant::getNullValue(DestTy); + // If the cast operand is a constant expression, there's a few things we can // do to try to simplify it. if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) { |