https://bugs.llvm.org/show_bug.cgi?id=47287
Bug ID: 47287
Summary: codeview assertion fails on lowerBound
Product: libraries
Version: 11.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Blocks: 46725
Created attachment 23885
--> https://bugs.llvm.org/attachment.cgi?id=23885&action=edit
IR for the unboxed-closures-unique-type-id.rs test
We encountered this assertion in Rust x86_64-msvc trying to upgrade to LLVM 11.
https://github.com/rust-lang/rust/pull/73526#issuecomment-678576555
llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
1595 │ assert(!Subrange->getRawLowerBound() &&
1596 │ "codeview doesn't support subranges with lower bounds");
The IR for that failed test is attached. It contains this:
!157 = !DISubrange(count: 3, lowerBound: 0)
The actual assertion was changed in D80197, specifically here:
https://github.com/llvm/llvm-project/commit/d20bf5a7258d4b6a7f017a81b125275dac1aa166#diff-8412e58a7e99d6349b9f9418af573792
I confirmed that our IR passes the assertion before that commit, when it
checked "Subrange->getLowerBound() == 0". I think that
"!Subrange->getRawLowerBound()" is not equivalent though because that raw
return value is a "Metadata *", so the assertion is now checking that it's
NULL. This is different than having the lowerBound present with a constant
value 0.
Referenced Bugs:
https://bugs.llvm.org/show_bug.cgi?id=46725
[Bug 46725] [meta] 11.0.0 Release Blockers
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