https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108250
--- Comment #13 from Arsen Arsenović <arsen at gcc dot gnu.org> ---
as an update, we've recently gotten valgrind working on a ppc32 machine, and we
get the following:
==2738== Conditional jump or move depends on uninitialised value(s)
==2738== at 0x17E55C: __eq (tuple:1472)
==2738== by 0x17E55C: operator==<bool, bool, bool, bool> (tuple:1504)
==2738== by 0x17E55C: operator!=<bool, bool, bool, bool> (tuple:1553)
==2738== by 0x17E55C:
llvm::TypeInfer::EnforceSmallerThan(llvm::TypeSetByHwMode&,
llvm::TypeSetByHwMode&, bool)::{lambda(llvm::MVT,
llvm::MVT)#4}::operator()(llvm::MVT, llvm::MVT) const [clone .constprop.0]
(CodeGenDAGPatterns.cpp:556)
==2738== by 0x180E9F: __invoke_impl<bool,
llvm::TypeInfer::EnforceSmallerThan(llvm::TypeSetByHwMode&,
llvm::TypeSetByHwMode&, bool)::<lambda(llvm::MVT, llvm::MVT)>&, llvm::MVT&,
llvm::MVT&> (invoke.h:61)
==2738== by 0x180E9F:
__invoke<llvm::TypeInfer::EnforceSmallerThan(llvm::TypeSetByHwMode&,
llvm::TypeSetByHwMode&, bool)::<lambda(llvm::MVT, llvm::MVT)>&, llvm::MVT&,
llvm::MVT&> (invoke.h:96)
==2738== by 0x180E9F: __call<bool, llvm::MVT&, 0, 1> (functional:495)
==2738== by 0x180E9F: operator()<llvm::MVT&> (functional:580)
==2738== by 0x180E9F: bool
berase_if<std::_Bind<llvm::TypeInfer::EnforceSmallerThan(llvm::TypeSetByHwMode&,
llvm::TypeSetByHwMode&, bool)::{lambda(llvm::MVT, llvm::MVT)#4}
(std::_Placeholder<1>, llvm::MVT)> >(llvm::MachineValueTypeSet&,
std::_Bind<llvm::TypeInfer::EnforceSmallerThan(llvm::TypeSetByHwMode&,
llvm::TypeSetByHwMode&, bool)::{lambda(llvm::MVT, llvm::MVT)#4}
(std::_Placeholder<1>, llvm::MVT)>) (CodeGenDAGPatterns.cpp:59)
==2738== by 0x199113:
llvm::TypeInfer::EnforceSmallerThan(llvm::TypeSetByHwMode&,
llvm::TypeSetByHwMode&, bool) [clone .part.0] (CodeGenDAGPatterns.cpp:573)
==2738== by 0x1A4013: ApplyTypeConstraint (CodeGenDAGPatterns.cpp:1641)
==2738== by 0x1A4013: ApplyTypeConstraints (CodeGenDAGPatterns.h:1269)
==2738== by 0x1A4013:
llvm::TreePatternNode::ApplyTypeConstraints(llvm::TreePattern&, bool)
(CodeGenDAGPatterns.cpp:2564)
==2738== by 0x1A4DFB:
llvm::TreePattern::InferAllTypes(llvm::StringMap<llvm::SmallVector<llvm::TreePatternNode*,
1u>, llvm::MallocAllocator> const*) (CodeGenDAGPatterns.cpp:3094)
==2738== by 0x1AE02F: llvm::CodeGenDAGPatterns::ParsePatternFragments(bool)
(CodeGenDAGPatterns.cpp:3352)
==2738== by 0x1AE893:
llvm::CodeGenDAGPatterns::CodeGenDAGPatterns(llvm::RecordKeeper&,
std::function<void (llvm::TreePattern*)>) (CodeGenDAGPatterns.cpp:3195)
==2738== by 0x2CF00B: GlobalISelEmitter (GlobalISelEmitter.cpp:3809)
==2738== by 0x2CF00B: llvm::EmitGlobalISel(llvm::RecordKeeper&,
llvm::raw_ostream&) (GlobalISelEmitter.cpp:6312)
==2738== by 0x352E1F: (anonymous
namespace)::LLVMTableGenMain(llvm::raw_ostream&, llvm::RecordKeeper&)
(TableGen.cpp:251)
==2738== by 0x3E8447: llvm::TableGenMain(char const*, bool
(*)(llvm::raw_ostream&, llvm::RecordKeeper&)) (Main.cpp:122)
==2738== by 0x134BD7: main (TableGen.cpp:296)
==2738==
==2738== Conditional jump or move depends on uninitialised value(s)
==2738== at 0x17E55C: __eq (tuple:1472)
==2738== by 0x17E55C: operator==<bool, bool, bool, bool> (tuple:1504)
==2738== by 0x17E55C: operator!=<bool, bool, bool, bool> (tuple:1553)
==2738== by 0x17E55C:
llvm::TypeInfer::EnforceSmallerThan(llvm::TypeSetByHwMode&,
llvm::TypeSetByHwMode&, bool)::{lambda(llvm::MVT,
llvm::MVT)#4}::operator()(llvm::MVT, llvm::MVT) const [clone .constprop.0]
(CodeGenDAGPatterns.cpp:556)
==2738== by 0x1810FF: __invoke_impl<bool,
llvm::TypeInfer::EnforceSmallerThan(llvm::TypeSetByHwMode&,
llvm::TypeSetByHwMode&, bool)::<lambda(llvm::MVT, llvm::MVT)>&, llvm::MVT&,
llvm::MVT&> (invoke.h:61)
==2738== by 0x1810FF:
__invoke<llvm::TypeInfer::EnforceSmallerThan(llvm::TypeSetByHwMode&,
llvm::TypeSetByHwMode&, bool)::<lambda(llvm::MVT, llvm::MVT)>&, llvm::MVT&,
llvm::MVT&> (invoke.h:96)
==2738== by 0x1810FF: __call<bool, llvm::MVT&, 0, 1> (functional:495)
==2738== by 0x1810FF: operator()<llvm::MVT&> (functional:580)
==2738== by 0x1810FF: bool
berase_if<std::_Bind<llvm::TypeInfer::EnforceSmallerThan(llvm::TypeSetByHwMode&,
llvm::TypeSetByHwMode&, bool)::{lambda(llvm::MVT, llvm::MVT)#4} (llvm::MVT,
std::_Placeholder<1>)> >(llvm::MachineValueTypeSet&,
std::_Bind<llvm::TypeInfer::EnforceSmallerThan(llvm::TypeSetByHwMode&,
llvm::TypeSetByHwMode&, bool)::{lambda(llvm::MVT, llvm::MVT)#4} (llvm::MVT,
std::_Placeholder<1>)>) (CodeGenDAGPatterns.cpp:59)
==2738== by 0x19919B:
llvm::TypeInfer::EnforceSmallerThan(llvm::TypeSetByHwMode&,
llvm::TypeSetByHwMode&, bool) [clone .part.0] (CodeGenDAGPatterns.cpp:580)
==2738== by 0x1A4013: ApplyTypeConstraint (CodeGenDAGPatterns.cpp:1641)
==2738== by 0x1A4013: ApplyTypeConstraints (CodeGenDAGPatterns.h:1269)
==2738== by 0x1A4013:
llvm::TreePatternNode::ApplyTypeConstraints(llvm::TreePattern&, bool)
(CodeGenDAGPatterns.cpp:2564)
==2738== by 0x1A4DFB:
llvm::TreePattern::InferAllTypes(llvm::StringMap<llvm::SmallVector<llvm::TreePatternNode*,
1u>, llvm::MallocAllocator> const*) (CodeGenDAGPatterns.cpp:3094)
==2738== by 0x1AE02F: llvm::CodeGenDAGPatterns::ParsePatternFragments(bool)
(CodeGenDAGPatterns.cpp:3352)
==2738== by 0x1AE893:
llvm::CodeGenDAGPatterns::CodeGenDAGPatterns(llvm::RecordKeeper&,
std::function<void (llvm::TreePattern*)>) (CodeGenDAGPatterns.cpp:3195)
==2738== by 0x2CF00B: GlobalISelEmitter (GlobalISelEmitter.cpp:3809)
==2738== by 0x2CF00B: llvm::EmitGlobalISel(llvm::RecordKeeper&,
llvm::raw_ostream&) (GlobalISelEmitter.cpp:6312)
==2738== by 0x352E1F: (anonymous
namespace)::LLVMTableGenMain(llvm::raw_ostream&, llvm::RecordKeeper&)
(TableGen.cpp:251)
==2738== by 0x3E8447: llvm::TableGenMain(char const*, bool
(*)(llvm::raw_ostream&, llvm::RecordKeeper&)) (Main.cpp:122)
==2738== by 0x134BD7: main (TableGen.cpp:296)
(and a few similar diagnostics)
these do not happen on x86 and there seems to be no conditional compilation.
I'll try to finish up a reduction soon, but I've been swamped as of late. I
have a reduction that deoptimized most code, leaving us with just a few
functions still being optimized, while still reproducing the bug, so that might
shed some light too.
presuming that some bit of GCC decided to remove a store that'd initialize
those values, any hint on how to see what?
