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Fix Transforms/IndVarsSimplify/2006-03-31-NegativeStride.ll and

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PR726 by performing consistent signed division, not consistent unsigned
division when evaluating scev's.  Do not touch udivs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27326 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2006-04-01 04:48:52 +00:00
parent b076783e7d
commit 60a05cc118
3 changed files with 39 additions and 39 deletions
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2
include/llvm/Analysis/ScalarEvolutionExpander.h
View File

@@ -136,7 +136,7 @@ namespace llvm {
Value *visitMulExpr(SCEVMulExpr *S);
Value *visitUDivExpr(SCEVUDivExpr *S) {
Value *visitSDivExpr(SCEVSDivExpr *S) {
const Type *Ty = S->getType();
Value *LHS = expandInTy(S->getLHS(), Ty);
Value *RHS = expandInTy(S->getRHS(), Ty);

22
include/llvm/Analysis/ScalarEvolutionExpressions.h
View File

@@ -23,7 +23,7 @@ namespace llvm {
enum SCEVTypes {
// These should be ordered in terms of increasing complexity to make the
// folders simpler.
scConstant, scTruncate, scZeroExtend, scAddExpr, scMulExpr, scUDivExpr,
scConstant, scTruncate, scZeroExtend, scAddExpr, scMulExpr, scSDivExpr,
scAddRecExpr, scUnknown, scCouldNotCompute
};
@@ -293,16 +293,16 @@ namespace llvm {
//===--------------------------------------------------------------------===//
/// SCEVUDivExpr - This class represents a binary unsigned division operation.
/// SCEVSDivExpr - This class represents a binary unsigned division operation.
///
class SCEVUDivExpr : public SCEV {
class SCEVSDivExpr : public SCEV {
SCEVHandle LHS, RHS;
SCEVUDivExpr(const SCEVHandle &lhs, const SCEVHandle &rhs)
: SCEV(scUDivExpr), LHS(lhs), RHS(rhs) {}
SCEVSDivExpr(const SCEVHandle &lhs, const SCEVHandle &rhs)
: SCEV(scSDivExpr), LHS(lhs), RHS(rhs) {}
virtual ~SCEVUDivExpr();
virtual ~SCEVSDivExpr();
public:
/// get method - This just gets and returns a new SCEVUDiv object.
/// get method - This just gets and returns a new SCEVSDiv object.
///
static SCEVHandle get(const SCEVHandle &LHS, const SCEVHandle &RHS);
@@ -334,9 +334,9 @@ namespace llvm {
void print(std::ostream &OS) const;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const SCEVUDivExpr *S) { return true; }
static inline bool classof(const SCEVSDivExpr *S) { return true; }
static inline bool classof(const SCEV *S) {
return S->getSCEVType() == scUDivExpr;
return S->getSCEVType() == scSDivExpr;
}
};
@@ -496,8 +496,8 @@ namespace llvm {
return ((SC*)this)->visitAddExpr((SCEVAddExpr*)S);
case scMulExpr:
return ((SC*)this)->visitMulExpr((SCEVMulExpr*)S);
case scUDivExpr:
return ((SC*)this)->visitUDivExpr((SCEVUDivExpr*)S);
case scSDivExpr:
return ((SC*)this)->visitSDivExpr((SCEVSDivExpr*)S);
case scAddRecExpr:
return ((SC*)this)->visitAddRecExpr((SCEVAddRecExpr*)S);
case scUnknown: