https://bugs.llvm.org/show_bug.cgi?id=42296
Bug ID: 42296
Summary: Identity addrspacecast's are thrown with asserts
enabled.
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: alex.dav...@iinet.net.au
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org,
neeil...@live.com, richard-l...@metafoo.co.uk
CastInst::castIsValid returns false for addrspacecasts from/to the same space,
triggering an assertion failure in clang debug builds:
assert(CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!");
A simple test case:
static int x;
return *(unsigned char __attribute__((address_space(0))) *)&x;
Which should blow up on any system with asserts enabled. Note, casting to a
different type is required to reproduce the error, as otherwise clang
simplifies the cast away.
With assertions disabled, the code compiles, however the identity addrspacecast
is emitted and probably should not be.
Note: address_space(0) is used only as an example here, the assertion will fail
whenever the value and cast are in the same space.
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