[NVPTX] Assembly printer didn't implement MCBinaryExpr::And

[DataCorrupted]

While compiling the following code using nvptx64, Assembly printer hit an unreachable. https://godbolt.org/z/4xEP8js58

@G = global <4 x i32> <i32 7, i32 7, i32 7, i32 7>
@G_addr = global i20 ptrtoint (<4 x i32>* @G to i20)

Unhandled binary operator
UNREACHABLE executed at /root/llvm-project/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp:2129!
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.	Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/llc -o /app/output.s -x86-asm-syntax=intel -mtriple=nvptx64 <source>
 #0 0x00005649b897460f llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x382660f)
 #1 0x00005649b8971fd4 SignalHandler(int) Signals.cpp:0:0
 #2 0x00007f01b7dce420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
 #3 0x00007f01b789b00b raise (/lib/x86_64-linux-gnu/libc.so.6+0x4300b)
 #4 0x00007f01b787a859 abort (/lib/x86_64-linux-gnu/libc.so.6+0x22859)
 #5 0x00005649b88d66fe (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x37886fe)
 #6 0x00005649b6ac6c71 llvm::NVPTXAsmPrinter::printMCExpr(llvm::MCExpr const&, llvm::raw_ostream&) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x1978c71)
 #7 0x00005649b6ace505 llvm::NVPTXAsmPrinter::printModuleLevelGV(llvm::GlobalVariable const*, llvm::raw_ostream&, bool, llvm::NVPTXSubtarget const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x1980505)
 #8 0x00005649b6acef87 llvm::NVPTXAsmPrinter::emitGlobals(llvm::Module const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x1980f87)
 #9 0x00005649b6acfbf3 llvm::NVPTXAsmPrinter::doFinalization(llvm::Module&) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x1981bf3)
#10 0x00005649b80653a5 llvm::FPPassManager::doFinalization(llvm::Module&) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x2f173a5)
#11 0x00005649b8071da6 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x2f23da6)
#12 0x00005649b5cfc983 compileModule(char**, llvm::LLVMContext&) llc.cpp:0:0
#13 0x00005649b5c3f642 main (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0xaf1642)
#14 0x00007f01b787c083 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24083)
#15 0x00005649b5cf3c5e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0xba5c5e)
Compiler returned: 139

Cause

When lowering i20, NVPTXAsmPrinter::lowerConstantForGV creates an And with -1 to extract bits. (Shown below)

llvm-project/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp

Lines 2040 to 2060 in c823517

	case Instruction::PtrToInt: {
	const DataLayout &DL = getDataLayout();
	// Support only foldable casts to/from pointers that can be eliminated by
	// changing the pointer to the appropriately sized integer type.
	Constant *Op = CE->getOperand(0);
	Type *Ty = CE->getType();
	const MCExpr *OpExpr = lowerConstantForGV(Op, ProcessingGeneric);
	// We can emit the pointer value into this slot if the slot is an
	// integer slot equal to the size of the pointer.
	if (DL.getTypeAllocSize(Ty) == DL.getTypeAllocSize(Op->getType()))
	return OpExpr;
	// Otherwise the pointer is smaller than the resultant integer, mask off
	// the high bits so we are sure to get a proper truncation if the input is
	// a constant expr.
	unsigned InBits = DL.getTypeAllocSizeInBits(Op->getType());
	const MCExpr *MaskExpr = MCConstantExpr::create(~0ULL >> (64-InBits), Ctx);
	return MCBinaryExpr::createAnd(OpExpr, MaskExpr, Ctx);

However, And is not handled when printing the assembly in NVPTXAsmPrinter::printMCExpr. (Shown below)

llvm-project/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp

Lines 2117 to 2129 in c823517

	switch (BE.getOpcode()) {
	case MCBinaryExpr::Add:
	// Print "X-42" instead of "X+-42".
	if (const MCConstantExpr *RHSC = dyn_cast<MCConstantExpr>(BE.getRHS())) {
	if (RHSC->getValue() < 0) {
	OS << RHSC->getValue();
	return;
	}
	}
	OS << '+';
	break;
	default: llvm_unreachable("Unhandled binary operator");

It shouldn't be a hard fix, if anyone can tell me what are the expected syntax for bit wise And in NVPTX

[DataCorrupted]

@Artem-B @jholewinski
cc @HazyFish

[Artem-B]

@G_addr = global i20 ptrtoint (<4 x i32>* @g to i20)

The IR does not seem to make much sense to me and I do not think you can actually express it in PTX, either.

expected syntax for bit wise And in NVPTX

I strongly suspect that ptxas will not accept an attempt to initialize a global with an expression. The syntax allowed by PTX is very limited and my naive attempt didn't work: https://godbolt.org/z/zfnsfecMd