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When checking for signed multiplication overflow, watch out for INT_MIN and -1.
This fixes PR9845. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131919 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2522,6 +2522,8 @@ void LSRInstance::GenerateICmpZeroScales(LSRUse &LU, unsigned LUIdx,
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// Check that multiplying with the unfolded offset doesn't overflow.
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if (F.UnfoldedOffset != 0) {
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if (F.UnfoldedOffset == INT64_MIN && Factor == -1)
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continue;
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F.UnfoldedOffset = (uint64_t)F.UnfoldedOffset * Factor;
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if (F.UnfoldedOffset / Factor != Base.UnfoldedOffset)
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continue;
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@ -25,3 +25,21 @@ __ABContainsLabel.exit:
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%cmp = icmp eq i64 %indvar, 9223372036854775807
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ret i1 %cmp
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}
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define void @func_37() noreturn nounwind readonly {
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entry:
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br label %for.body
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for.body: ; preds = %for.inc8, %entry
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%indvar = phi i64 [ 0, %entry ], [ %indvar.next, %for.inc8 ]
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%sub.i = add i64 undef, %indvar
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%cmp.i = icmp eq i64 %sub.i, -9223372036854775808
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br i1 undef, label %for.inc8, label %for.cond4
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for.cond4: ; preds = %for.cond4, %for.body
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br label %for.cond4
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for.inc8: ; preds = %for.body
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%indvar.next = add i64 %indvar, 1
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br label %for.body
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}
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