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author | Chris Lattner <sabre@nondot.org> | 2006-03-07 01:28:57 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2006-03-07 01:28:57 +0000 |
commit | 51c26e911af1b269234da336a03977153cf08d46 (patch) | |
tree | 1d8b5b0932756bea01bdcc0041f3474b76b43be3 | |
parent | b18966c28caea4d3e1a3263155521ddfa7091252 (diff) | |
download | external_llvm-51c26e911af1b269234da336a03977153cf08d46.zip external_llvm-51c26e911af1b269234da336a03977153cf08d46.tar.gz external_llvm-51c26e911af1b269234da336a03977153cf08d46.tar.bz2 |
Teach the alignment handling code to look through constant expr casts and GEPs
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26580 91177308-0d34-0410-b5e6-96231b3b80d8
-rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index a3eb950..3eb452c 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -5285,11 +5285,17 @@ static unsigned GetKnownAlignment(Value *V, TargetData *TD) { } } return Align; - } else if (CastInst *CI = dyn_cast<CastInst>(V)) { + } else if (isa<CastInst>(V) || + (isa<ConstantExpr>(V) && + cast<ConstantExpr>(V)->getOpcode() == Instruction::Cast)) { + User *CI = cast<User>(V); if (isa<PointerType>(CI->getOperand(0)->getType())) return GetKnownAlignment(CI->getOperand(0), TD); return 0; - } else if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(V)) { + } else if (isa<GetElementPtrInst>(V) || + (isa<ConstantExpr>(V) && + cast<ConstantExpr>(V)->getOpcode()==Instruction::GetElementPtr)) { + User *GEPI = cast<User>(V); unsigned BaseAlignment = GetKnownAlignment(GEPI->getOperand(0), TD); if (BaseAlignment == 0) return 0; @@ -5311,8 +5317,10 @@ static unsigned GetKnownAlignment(Value *V, TargetData *TD) { const Type *BasePtrTy = GEPI->getOperand(0)->getType(); if (TD->getTypeAlignment(cast<PointerType>(BasePtrTy)->getElementType()) - <= BaseAlignment) - return TD->getTypeAlignment(GEPI->getType()->getElementType()); + <= BaseAlignment) { + const Type *GEPTy = GEPI->getType(); + return TD->getTypeAlignment(cast<PointerType>(GEPTy)->getElementType()); + } return 0; } return 0; |