https://bugs.llvm.org/show_bug.cgi?id=45131
Bug ID: 45131
Summary: Large alignment assumptions overflow 32-bit
'unsigned', trip zero alignment assertion
Product: clang
Version: 9.0
Hardware: PC
OS: FreeBSD
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected]
Assertion failed: (Alignment != 0 && "Invalid Alignment"), function
CreateAlignmentAssumption, file llvm-project/llvm/include/llvm/IR/IRBuilder.h,
line 2573.
1. <eof> parser at end of file
2. Per-file LLVM IR generation
3. ../../v8/src/common/ptr-compr-inl.h:30:19: Generating code for
declaration 'v8::internal::GetIsolateRoot'
FreeBSD clang version 9.0.1 ([email protected]:llvm/llvm-project.git
c1a0a213378a458fbea1a5c77b315c7dce08fd05) (based on LLVM 9.0.1)
Target: x86_64-unknown-freebsd13.0
Thread model: posix
This is tickled by Chrome's v8 engine, which asserts 4GB alignment with
something like:
__builtin_assume_aligned(foo, size_t{4} * GB)
in an inlined function, GetIsolateRoot().
The assertion tripped seems to be in CreateAlignmentAssumption(), which takes
an 'unsigned Alignment' and asserts it is non-zero. 2^32 mod 2^32 is zero, so
the assertion fires. For now I am working around this issue by disabling use
of __builtin_assume_aligned() in v8.
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