[llvm-bugs] [Bug 48615] New: Assertion `NumBits <= MAX_INT_BITS && "bitwidth too large"' on large store

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48615

            Bug ID: 48615
           Summary: Assertion `NumBits <= MAX_INT_BITS && "bitwidth too
                    large"' on large store
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: arnetheduck at gmail.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

`splitMergedValStore` tries to create an integer with the number of bits that
the size of the type has - for example, a 5 mb type will try to create an
integer with 5*1024*1024*8 bits which fails the MAX_INT_BITS check.

https://github.com/llvm/llvm-project/blob/a485a59d2172daaee1d5e734da54fbb243f7d54c/llvm/lib/CodeGen/CodeGenPrepare.cpp#L7271


```
%large = type { [42000000 x i8] }

define void @set(%large, %large*) {
  store %large %0, %large* %1
  ret void
}
```

```
$ llc test.ll
llc: ../lib/IR/Type.cpp:256: static llvm::IntegerType*
llvm::IntegerType::get(llvm::LLVMContext&, unsigned int): Assertion `NumBits <=
MAX_INT_BITS && "bitwidth too large"' failed.

...
 #9 0x00007fc02ab9c4f7 llvm::IntegerType::get(llvm::LLVMContext&, unsigned int)
../lib/IR/Type.cpp:255:3
#10 0x00007fc02ac4a02a llvm::DataLayout::getTypeStoreSize(llvm::Type*) const
../include/llvm/IR/DataLayout.h:459:45
#11 0x00007fc02ac4a02a llvm::DataLayout::getTypeStoreSizeInBits(llvm::Type*)
../include/llvm/IR/DataLayout.h:471:35
#12 0x00007fc02ac4a02a llvm::DataLayout::typeSizeEqualsStoreSize(llvm::Type*)
../include/llvm/IR/DataLayout.h:479:62
#13 0x00007fc02ac4a02a splitMergedValStore
../lib/CodeGen/CodeGenPrepare.cpp:7191:34
```

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