[llvm] [PowerPC] Mask constant operands in ValueBit tracking (PR #67653)

[Jacob Young via llvm-commits]

jacobly0 wrote:

I was going to report the following bug, but since it is already fixed by this change, maybe this even simpler repro would be useful to add as a test since it doesn't involve any vectors:
```llvm
target triple = "powerpc"
define i64 @entry(ptr) {
  store i6 0, ptr %0
  %2 = load i8, ptr %0
  %3 = and i8 %2, 63
  %4 = zext i8 %3 to i64
  %5 = shl i64 1, %4
  ret i64 %5
}
```
```
$ llc -version
LLVM (http://llvm.org/):
  LLVM version 17.0.6
  DEBUG build with assertions.
  Default target: x86_64-unknown-linux-gnu
  Host CPU: znver4
$ llc repro.ll
llc: llvm/include/llvm/ADT/SmallVector.h:294: reference llvm::SmallVectorTemplateCommon<(anonymous namespace)::BitPermutationSelector::ValueBit>::operator[](size_type) [T = (anonymous namespace)::BitPermutationSelector::ValueBit]: Assertion `idx < size()' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.	Program arguments: llc repro.ll
1.	Running pass 'Function Pass Manager' on module 'repro.ll'.
2.	Running pass 'PowerPC DAG->DAG Pattern Instruction Selection' on function '@entry'
 #0 0x00007f2d0ca6dd06 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) llvm/lib/Support/Unix/Signals.inc:602:11
 #1 0x00007f2d0ca6e25b PrintStackTraceSignalHandler(void*) llvm/lib/Support/Unix/Signals.inc:675:1
 #2 0x00007f2d0ca6c403 llvm::sys::RunSignalHandlers() llvm/lib/Support/Signals.cpp:104:5
 #3 0x00007f2d0ca6e941 SignalHandler(int) llvm/lib/Support/Unix/Signals.inc:413:1
 #4 0x00007f2d0c2b5c90 (/usr/lib64/libc.so.6+0x39c90)
 #5 0x00007f2d0c30619c (/usr/lib64/libc.so.6+0x8a19c)
 #6 0x00007f2d0c2b5be2 gsignal (/usr/lib64/libc.so.6+0x39be2)
 #7 0x00007f2d0c29e4ed abort (/usr/lib64/libc.so.6+0x224ed)
 #8 0x00007f2d0c29e415 (/usr/lib64/libc.so.6+0x22415)
 #9 0x00007f2d0c2ae542 (/usr/lib64/libc.so.6+0x32542)
#10 0x00007f2d15445499 llvm::SmallVectorTemplateCommon<(anonymous namespace)::BitPermutationSelector::ValueBit, void>::operator[](unsigned long) llvm/include/llvm/ADT/SmallVector.h:0:5
#11 0x00007f2d1544344f (anonymous namespace)::BitPermutationSelector::getValueBits(llvm::SDValue, unsigned int) llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp:1645:19
#12 0x00007f2d1544395a (anonymous namespace)::BitPermutationSelector::getValueBits(llvm::SDValue, unsigned int) llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp:1694:30
#13 0x00007f2d15441e59 (anonymous namespace)::BitPermutationSelector::Select(llvm::SDNode*) llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp:2825:9
#14 0x00007f2d154385ec (anonymous namespace)::PPCDAGToDAGISel::tryBitPermutation(llvm::SDNode*) llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp:4096:17
#15 0x00007f2d154211c6 (anonymous namespace)::PPCDAGToDAGISel::Select(llvm::SDNode*) llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp:5195:7
#16 0x00007f2d111cdbba llvm::SelectionDAGISel::DoInstructionSelection() llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:1179:5
#17 0x00007f2d111ccbb5 llvm::SelectionDAGISel::CodeGenAndEmitDAG() llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:950:3
#18 0x00007f2d111cb459 llvm::SelectionDAGISel::SelectBasicBlock(llvm::ilist_iterator<llvm::ilist_detail::node_options<llvm::Instruction, true, false, void>, false, true>, llvm::ilist_iterator<llvm::ilist_detail::node_options<llvm::Instruction, true, false, void>, false, true>, bool&) llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:702:1
#19 0x00007f2d111cae34 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:1705:11
#20 0x00007f2d111c82c0 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:482:3
#21 0x00007f2d15420d26 (anonymous namespace)::PPCDAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&) llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp:173:7
#22 0x00007f2d1046b4cc llvm::MachineFunctionPass::runOnFunction(llvm::Function&) llvm/lib/CodeGen/MachineFunctionPass.cpp:91:8
#23 0x00007f2d0d427815 llvm::FPPassManager::runOnFunction(llvm::Function&) llvm/lib/IR/LegacyPassManager.cpp:1435:23
#24 0x00007f2d0d42cd4f llvm::FPPassManager::runOnModule(llvm::Module&) llvm/lib/IR/LegacyPassManager.cpp:1481:16
#25 0x00007f2d0d42818b (anonymous namespace)::MPPassManager::runOnModule(llvm::Module&) llvm/lib/IR/LegacyPassManager.cpp:1550:23
#26 0x00007f2d0d427c9a llvm::legacy::PassManagerImpl::run(llvm::Module&) llvm/lib/IR/LegacyPassManager.cpp:535:16
#27 0x00007f2d0d42d051 llvm::legacy::PassManager::run(llvm::Module&) llvm/lib/IR/LegacyPassManager.cpp:1677:3
#28 0x000055e89c38576f compileModule(char**, llvm::LLVMContext&) llvm/tools/llc/llc.cpp:754:41
#29 0x000055e89c3839d5 main llvm/tools/llc/llc.cpp:416:13
#30 0x00007f2d0c29feea (/usr/lib64/libc.so.6+0x23eea)
#31 0x00007f2d0c29ffa5 __libc_start_main (/usr/lib64/libc.so.6+0x23fa5)
#32 0x000055e89c3831a1 _start (bin/llc+0x2e1a1)
Aborted (core dumped)
```

https://github.com/llvm/llvm-project/pull/67653