https://bugs.llvm.org/show_bug.cgi?id=43638
Bug ID: 43638
Summary: builtin_assume_aligned uses 32-bits for alignment
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected]
This test cases crashes clang, because 'unsigned' is used for the alignment,
rather than 'size_t'.
const void * square(const void* num) {
void* a = __builtin_assume_aligned((const void*)num, 4294967296);
return a;
}
Assertion:
llvm/llvm/include/llvm/IR/IRBuilder.h:2624: llvm::CallInst* llvm::IRBuilder<T,
Inserter>::CreateAlignmentAssumption(const llvm::DataLayout&, llvm::Value*,
unsigned int, llvm::Value*, llvm::Value**) [with T = llvm::ConstantFolder;
Inserter = clang::CodeGen::CGBuilderInserter]: Assertion `Alignment != 0 &&
"Invalid Alignment"' failed.
The affected functions are `EmitAlignmentAssumption` in
lib/CodeGen/CodeGenFunction.h and also `CreateAlignmentAssumption` in
include/llvm/IR/IRBuilder.h
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