r224351 causing crashes while building ICU

[Reid Kleckner]

I plan to revert it, as the mailing lists are down and it's hard to
discover these kinds of failures without them.

I'll try to get you a reproducer. There's a bad cast with this stack trace:

clang: third_party/llvm/llvm/include/llvm/Support/Casting.h:237:
typename cast_retty<X, Y *>::ret_type llvm::cast(Y *) [X =
llvm::Instruction, Y = llvm::Value]: Assertion `isa<X>(Val) &&
"cast<Ty>() argument of incompatible type!"' failed.

Program received signal SIGABRT, Aborted.
0x00007ffff732d6db in raise () from /usr/grte/v4/lib64/libc.so.6
(gdb) bt
#0  0x00007ffff732d6db in raise () from /usr/grte/v4/lib64/libc.so.6
#1  0x00007ffff732f3ef in abort () from /usr/grte/v4/lib64/libc.so.6
#2  0x00007ffff73262a9 in __assert_fail_base () from
/usr/grte/v4/lib64/libc.so.6
#3  0x00007ffff7326353 in __assert_fail () from /usr/grte/v4/lib64/libc.so.6
#4  0x000000000059ce69 in llvm::cast_retty<llvm::Instruction,
llvm::Value*>::ret_type llvm::cast<llvm::Instruction,
llvm::Value>(llvm::Value*) ()
#5  0x0000000002ea8346 in (anonymous
namespace)::TypePromotionHelper::promoteOperandForOther(llvm::Instruction*,
(anonymous namespace)::TypePromotionTransaction&,
llvm::DenseMap<llvm::Instruction*, (anonymous namespace)::TypeIsSExt,
llvm::DenseMapInfo<llvm::Instruction*>,
llvm::detail::DenseMapPair<llvm::Instruction*, (anonymous
namespace)::TypeIsSExt> >&, unsigned int&,
llvm::SmallVectorImpl<llvm::Instruction*>*,
llvm::SmallVectorImpl<llvm::Instruction*>*, bool) ()
#6  0x0000000002ea7c89 in (anonymous
namespace)::TypePromotionHelper::zeroExtendOperandForOther(llvm::Instruction*,
(anonymous namespace)::TypePromotionTransaction&,
llvm::DenseMap<llvm::Instruction*, (anonymous namespace)::TypeIsSExt,
llvm::DenseMapInfo<llvm::Instruction*>,
llvm::detail::DenseMapPair<llvm::Instruction*, (anonymous
namespace)::TypeIsSExt> >&, unsigned int&,
llvm::SmallVectorImpl<llvm::Instruction*>*,
llvm::SmallVectorImpl<llvm::Instruction*>*) ()
#7  0x0000000002eaf016 in (anonymous
namespace)::CodeGenPrepare::ExtLdPromotion((anonymous
namespace)::TypePromotionTransaction&, llvm::LoadInst*&,
llvm::Instruction*&, llvm::SmallVectorImpl<llvm::Instruction*> const&,
unsigned int) ()
#8  0x0000000002e9f163 in (anonymous
namespace)::CodeGenPrepare::MoveExtToFormExtLoad(llvm::Instruction*&)
()
#9  0x0000000002e9def3 in (anonymous
namespace)::CodeGenPrepare::OptimizeInst(llvm::Instruction*) ()
#10 0x0000000002e9d9f6 in (anonymous
namespace)::CodeGenPrepare::OptimizeBlock(llvm::BasicBlock&) ()
#11 0x0000000002e9bdb7 in (anonymous
namespace)::CodeGenPrepare::runOnFunction(llvm::Function&) ()
#12 0x0000000003896a0d in llvm::FPPassManager::runOnFunction(llvm::Function&) ()
#13 0x0000000003896d18 in llvm::FPPassManager::runOnModule(llvm::Module&) ()
#14 0x00000000038973d9 in (anonymous
namespace)::MPPassManager::runOnModule(llvm::Module&) ()
#15 0x0000000003896fce in llvm::legacy::PassManagerImpl::run(llvm::Module&) ()
#16 0x0000000003897881 in llvm::legacy::PassManager::run(llvm::Module&) ()
#17 0x000000000045af33 in (anonymous
namespace)::EmitAssemblyHelper::EmitAssembly(clang::BackendAction,
llvm::raw_ostream*) ()
#18 0x000000000045a862 in
clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::CodeGenOptions const&, clang::TargetOptions const&,
clang::LangOptions const&, llvm::StringRef, llvm::Module*,
clang::BackendAction, llvm::raw_ostream*) ()
#19 0x0000000000436bb3 in
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) ()
#20 0x000000000170635b in clang::ParseAST(clang::Sema&, bool, bool) ()
#21 0x00000000013bcc29 in clang::ASTFrontendAction::ExecuteAction() ()
#22 0x00000000004347a1 in clang::CodeGenAction::ExecuteAction() ()
#23 0x00000000013bc710 in clang::FrontendAction::Execute() ()
#24 0x000000000126fc1b in
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) ()
#25 0x000000000042f4a8 in
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) ()
#26 0x0000000000416c67 in cc1_main(llvm::ArrayRef<char const*>, char
const*, void*) ()
#27 0x0000000000426f93 in ExecuteCC1Tool(llvm::ArrayRef<char const*>,
llvm::StringRef) ()
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20141216/ce289c81/attachment.html>