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Build the correct range for loops with unusual bounds. Fix from Jay Foad.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42394 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2470,7 +2470,7 @@ SCEVHandle SCEVAddRecExpr::getNumIterationsInRange(ConstantRange Range) const {
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APInt End = A.sge(One) ? (Range.getUpper() - One) : Range.getLower();
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// The exit value should be (End+A)/A.
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APInt ExitVal = (End + A).sdiv(A);
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APInt ExitVal = (End + A).udiv(A);
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ConstantInt *ExitValue = ConstantInt::get(ExitVal);
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// Evaluate at the exit value. If we really did fall out of the valid
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21
test/Analysis/ScalarEvolution/2007-09-27-LargeStepping.ll
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21
test/Analysis/ScalarEvolution/2007-09-27-LargeStepping.ll
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@ -0,0 +1,21 @@
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; RUN: llvm-as < %s | opt -analyze -scalar-evolution 2>&1 | grep "13 iterations"
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; PR1706
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define i32 @f() {
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entry:
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br label %bb5
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bb: ; preds = %bb5
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%tmp2 = shl i32 %j.0, 1 ; <i32> [#uses=1]
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%tmp4 = add i32 %i.0, 268435456 ; <i32> [#uses=1]
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br label %bb5
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bb5: ; preds = %bb, %entry
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%j.0 = phi i32 [ 1, %entry ], [ %tmp2, %bb ] ; <i32> [#uses=2]
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%i.0 = phi i32 [ -1879048192, %entry ], [ %tmp4, %bb ] ; <i32> [#uses=2]
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%tmp7 = icmp slt i32 %i.0, 1610612736 ; <i1> [#uses=1]
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br i1 %tmp7, label %bb, label %return
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return: ; preds = %bb5
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ret i32 %j.0
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}
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