http://llvm.org/bugs/show_bug.cgi?id=10799
Summary: CodegenOpt::None and llvm.gcroot trigger failure in
X86ISelDAG
Product: libraries
Version: trunk
Platform: PC
OS/Version: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=7167)
--> (http://llvm.org/bugs/attachment.cgi?id=7167)
minimal testcase
The attached testcase triggers failure in X86ISelDAG in LLVM 2.9 and trunk
(r138727) when CodeGenOpt level is None. I can reproduce this bug on LLVM 2.4,
but not 2.3 (under -fast instead of -O0).
$ ~/llvm/trunk/bin/llc -O0 test.ll
llc: /home/benkarel/llvm/src/trunk/include/llvm/Support/Casting.h:194: typename
llvm::cast_retty<To, From>::ret_type llvm::cast(const Y&) [with X =
llvm::FrameIndexSDNode, Y = llvm::SDNode*]: Assertion `isa<X>(Val) &&
"cast<Ty>() argument of incompatible type!"' failed.
0 llc 0x088c31b8
Stack dump:
0. Program arguments: /home/benkarel/llvm/trunk/bin/llc -O0 test.ll
1. Running pass 'Function Pass Manager' on module 'test.ll'.
2. Running pass 'X86 DAG->DAG Instruction Selection' on function '@f'
Aborted
This bug only seems to be triggered under a specific set of circumstances:
1) CodegenOpt level must be None
2) The first argument to llvm.gcroot must be a bitcast of an alloca. The bug
is not triggered if an alloca value is passed directly.
3) The GC plugin for the function must (I think) be one that emits stack
maps. The ocaml GC and my custom GC both trigger the bug, but the shadow-stack
GC does not.
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