return getAddRecExpr(Operands, AddRec->getLoop());
}
+ if (isa<SCEVCouldNotCompute>(Op))
+ return new SCEVCouldNotCompute();
+
SCEVTruncateExpr *&Result = (*SCEVTruncates)[std::make_pair(Op, Ty)];
if (Result == 0) Result = new SCEVTruncateExpr(Op, Ty);
return Result;
// operands (often constants). This would allow analysis of something like
// this: for (unsigned char X = 0; X < 100; ++X) { int Y = X; }
+ if (isa<SCEVCouldNotCompute>(Op))
+ return new SCEVCouldNotCompute();
+
SCEVZeroExtendExpr *&Result = (*SCEVZeroExtends)[std::make_pair(Op, Ty)];
if (Result == 0) Result = new SCEVZeroExtendExpr(Op, Ty);
return Result;
// operands (often constants). This would allow analysis of something like
// this: for (signed char X = 0; X < 100; ++X) { int Y = X; }
+ if (isa<SCEVCouldNotCompute>(Op))
+ return new SCEVCouldNotCompute();
+
SCEVSignExtendExpr *&Result = (*SCEVSignExtends)[std::make_pair(Op, Ty)];
if (Result == 0) Result = new SCEVSignExtendExpr(Op, Ty);
return Result;
// Sort by complexity, this groups all similar expression types together.
GroupByComplexity(Ops);
+ // Could not compute plus anything equals could not compute.
+ if (isa<SCEVCouldNotCompute>(Ops.back()))
+ return new SCEVCouldNotCompute();
+
// If there are any constants, fold them together.
unsigned Idx = 0;
if (SCEVConstant *LHSC = dyn_cast<SCEVConstant>(Ops[0])) {
// Sort by complexity, this groups all similar expression types together.
GroupByComplexity(Ops);
+ if (isa<SCEVCouldNotCompute>(Ops.back())) {
+ // CNC * 0 = 0
+ for (unsigned i = 0, e = Ops.size() - 1; i != e; ++i) {
+ if (Ops[i]->getSCEVType() != scConstant)
+ break;
+
+ SCEVConstant *SC = cast<SCEVConstant>(Ops[i]);
+ if (SC->getValue()->isMinValue(false))
+ return SC;
+ }
+
+ // Otherwise, we can't compute it.
+ return new SCEVCouldNotCompute();
+ }
+
// If there are any constants, fold them together.
unsigned Idx = 0;
if (SCEVConstant *LHSC = dyn_cast<SCEVConstant>(Ops[0])) {
// FIXME: implement folding of (X*4)/4 when we know X*4 doesn't overflow.
+ if (isa<SCEVCouldNotCompute>(LHS) || isa<SCEVCouldNotCompute>(RHS))
+ return new SCEVCouldNotCompute();
+
SCEVUDivExpr *&Result = (*SCEVUDivs)[std::make_pair(LHS, RHS)];
if (Result == 0) Result = new SCEVUDivExpr(LHS, RHS);
return Result;
}
}
+ // Refuse to build an AddRec out of SCEVCouldNotCompute.
+ for (unsigned i = 0, e = Operands.size(); i != e; ++i) {
+ if (isa<SCEVCouldNotCompute>(Operands[i]))
+ return new SCEVCouldNotCompute();
+ }
+
SCEVAddRecExpr *&Result =
(*SCEVAddRecExprs)[std::make_pair(L, std::vector<SCEV*>(Operands.begin(),
Operands.end()))];
// Sort by complexity, this groups all similar expression types together.
GroupByComplexity(Ops);
+ if (isa<SCEVCouldNotCompute>(Ops.back())) {
+ // CNC smax +inf = +inf.
+ for (unsigned i = 0, e = Ops.size() - 1; i != e; ++i) {
+ if (Ops[i]->getSCEVType() != scConstant)
+ break;
+
+ SCEVConstant *SC = cast<SCEVConstant>(Ops[i]);
+ if (SC->getValue()->isMaxValue(true))
+ return SC;
+ }
+
+ // Otherwise, we can't compute it.
+ return new SCEVCouldNotCompute();
+ }
+
// If there are any constants, fold them together.
unsigned Idx = 0;
if (SCEVConstant *LHSC = dyn_cast<SCEVConstant>(Ops[0])) {
// Sort by complexity, this groups all similar expression types together.
GroupByComplexity(Ops);
+ if (isa<SCEVCouldNotCompute>(Ops[0])) {
+ // CNC umax inf = inf.
+ for (unsigned i = 0, e = Ops.size() - 1; i != e; ++i) {
+ if (Ops[i]->getSCEVType() != scConstant)
+ break;
+
+ SCEVConstant *SC = cast<SCEVConstant>(Ops[i]);
+ if (SC->getValue()->isMaxValue(false))
+ return SC;
+ }
+
+ // Otherwise, we can't compute it.
+ return new SCEVCouldNotCompute();
+ }
+
// If there are any constants, fold them together.
unsigned Idx = 0;
if (SCEVConstant *LHSC = dyn_cast<SCEVConstant>(Ops[0])) {
--- /dev/null
+; RUN: llvm-as < %s | opt -indvars
+; PR2857
+
+@foo = external global i32 ; <i32*> [#uses=1]
+
+define void @test(i32 %n, i32 %arg) {
+entry:
+ br i1 false, label %bb.nph, label %return
+
+bb.nph: ; preds = %entry
+ %0 = load i32* @foo, align 4 ; <i32> [#uses=1]
+ %1 = sext i32 %0 to i64 ; <i64> [#uses=1]
+ br label %bb
+
+bb: ; preds = %bb, %bb.nph
+ %.in = phi i32 [ %2, %bb ], [ %n, %bb.nph ] ; <i32> [#uses=1]
+ %val.02 = phi i64 [ %5, %bb ], [ 0, %bb.nph ] ; <i64> [#uses=2]
+ %result.01 = phi i64 [ %4, %bb ], [ 0, %bb.nph ] ; <i64> [#uses=1]
+ %2 = add i32 %.in, -1 ; <i32> [#uses=2]
+ %3 = mul i64 %1, %val.02 ; <i64> [#uses=1]
+ %4 = add i64 %3, %result.01 ; <i64> [#uses=2]
+ %5 = add i64 %val.02, 1 ; <i64> [#uses=1]
+ %6 = icmp sgt i32 %2, 0 ; <i1> [#uses=1]
+ br i1 %6, label %bb, label %bb3.bb4_crit_edge
+
+bb3.bb4_crit_edge: ; preds = %bb
+ %.lcssa = phi i64 [ %4, %bb ] ; <i64> [#uses=0]
+ ret void
+
+return: ; preds = %entry
+ ret void
+}