[CASDB] OnDiskCAS should not create LeafNode when node has refs #4660
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Fix a bug that OnDiskCAS drops all the references when the data is large and a leaf node is created. Leaf node should only be used when there are no refs.
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@swift-ci please test |
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I suggest bumping the version (to v4?) since this one (v3?) will have bad data for anyone that saved something large. Otherwise LGTM. |
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@swift-ci please test |
benlangmuir
approved these changes
May 10, 2022
swift-ci
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that referenced
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Aug 12, 2025
M68k's SETCC instruction (`scc`) distinctly fills the destination byte
with all 1s. If boolean contents are set to `ZeroOrOneBooleanContent`,
LLVM can mistakenly think the destination holds `0x01` instead of `0xff`
and emit broken code as a result. This change corrects the boolean
content type to `ZeroOrNegativeOneBooleanContent`.
For example, this IR:
```llvm
define dso_local signext range(i8 0, 2) i8 @testBool(i32 noundef %a) local_unnamed_addr #0 {
entry:
%cmp = icmp eq i32 %a, 4660
%. = zext i1 %cmp to i8
ret i8 %.
}
```
would previously build as:
```asm
testBool: ; @testBool
cmpi.l #4660, (4,%sp)
seq %d0
and.l #255, %d0
rts
```
Notice the `zext` is erroneously not clearing the low bits, and thus the
register returns with 255 instead of 1. This patch fixes the issue:
```asm
testBool: ; @testBool
cmpi.l #4660, (4,%sp)
seq %d0
and.l #1, %d0
rts
```
Most of the tests containing `scc` suffered from the same value error as
described above, so those tests have been updated to match the new
output (which also logically corrects them).
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Fix a bug that OnDiskCAS drops all the references when the data is
large and a leaf node is created. Leaf node should only be used when
there are no refs.