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* Clean up the code a bit

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* Allow structs with negative offsets.  This enables the em3d benchmark to
  be made typesafe.  In this case, the struct had an array as the first
  element, so a negative index was ok (the expr was -8 + 8x)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2271 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-04-16 22:10:36 +00:00
parent f759c4e2a7
commit 169bffe28a
1 changed files with 4 additions and 8 deletions
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12
lib/Transforms/TransformInternals.cpp
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@ -161,15 +161,12 @@ const Type *ConvertableToGEP(const Type *Ty, Value *OffsetVal,
//
analysis::ExprType Expr = analysis::ClassifyExpression(OffsetVal);
// Get the offset and scale now...
// Get the offset and scale values if they exists...
// A scale of zero with Expr.Var != 0 means a scale of 1.
//
int Offset = 0;
int Scale = 0;
int Offset = Expr.Offset ? getConstantValue(Expr.Offset) : 0;
int Scale = Expr.Scale ? getConstantValue(Expr.Scale) : 0;
// Get the offset and scale values if they exists...
if (Expr.Offset) Offset = getConstantValue(Expr.Offset);
if (Expr.Scale) Scale = getConstantValue(Expr.Scale);
if (Expr.Var && Scale == 0) Scale = 1; // Scale != 0 if Expr.Var != 0
// Loop over the Scale and Offset values, filling in the Indices vector for
@ -182,9 +179,8 @@ const Type *ConvertableToGEP(const Type *Ty, Value *OffsetVal,
CompTy = cast<CompositeType>(NextTy);
if (const StructType *StructTy = dyn_cast<StructType>(CompTy)) {
if (Offset < 0) return 0; // Can't index negatively into structure
// Step into the appropriate element of the structure...
unsigned ActualOffset = (unsigned)Offset;
unsigned ActualOffset = (Offset < 0) ? 0 : (unsigned)Offset;
NextTy = getStructOffsetStep(StructTy, ActualOffset, Indices);
Offset -= ActualOffset;
} else {