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Fix PR1850 by removing an unsafe transformation from VMCore/ConstantFold.cpp.

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Reimplement the xform in Analysis/ConstantFolding.cpp where we can use
targetdata to validate that it is safe.  While I'm in there, fix some const
correctness issues and generalize the interface to the "operand folder".


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44817 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2007-12-10 22:53:04 +00:00
parent 9324665a78
commit f286f6fd93
7 changed files with 134 additions and 43 deletions
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20
include/llvm/Analysis/ConstantFolding.h
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@ -21,6 +21,7 @@ namespace llvm {
class Instruction;
class TargetData;
class Function;
class Type;
/// ConstantFoldInstruction - Attempt to constant fold the specified
/// instruction. If successful, the constant result is returned, if not, null
@ -35,12 +36,17 @@ Constant *ConstantFoldInstruction(Instruction *I, const TargetData *TD = 0);
/// fold instructions like loads and stores, which have no constant expression
/// form.
///
Constant *ConstantFoldInstOperands(
const Instruction *I, ///< The model instruction
Constant** Ops, ///< The array of constant operands to use.
unsigned NumOps, ///< The number of operands provided.
const TargetData *TD = 0 ///< Optional target information.
);
Constant *ConstantFoldInstOperands(unsigned Opcode, const Type *DestTy,
Constant*const * Ops, unsigned NumOps,
const TargetData *TD = 0);
/// ConstantFoldCompareInstOperands - Attempt to constant fold a compare
/// instruction (icmp/fcmp) with the specified operands. If it fails, it
/// returns a constant expression of the specified operands.
///
Constant *ConstantFoldCompareInstOperands(unsigned Predicate,
Constant*const * Ops, unsigned NumOps,
const TargetData *TD = 0);
/// ConstantFoldLoadThroughGEPConstantExpr - Given a constant and a
@ -55,7 +61,7 @@ bool canConstantFoldCallTo(Function *F);
/// ConstantFoldCall - Attempt to constant fold a call to the specified function
/// with the specified arguments, returning null if unsuccessful.
Constant *
ConstantFoldCall(Function *F, Constant** Operands, unsigned NumOperands);
ConstantFoldCall(Function *F, Constant* const* Operands, unsigned NumOperands);
}
#endif