https://bugs.llvm.org/show_bug.cgi?id=50377
Bug ID: 50377
Summary: [CodeGen] Failed to select store instruction with
certain operands
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: M68k
Assignee: unassignedb...@nondot.org
Reporter: miny...@uci.edu
CC: glaub...@physik.fu-berlin.de,
llvm-bugs@lists.llvm.org, miny...@uci.edu
Here is the IR code to reproduce the problem:
```
@var = global [2 x i16] zeroinitializer
define void @foo() {
%1 = load volatile [2 x i16], [2 x i16]* @var
store volatile [2 x i16] %1, [2 x i16]* @var
ret void
}
```
With this command: `llc -mtriple=m68k input.ll`
It will give us the following error message:
```
LLVM ERROR: Cannot select: t11: ch = store<(volatile store 2 into @var + 2)>
t8, t7, t6, undef:i32
t7: i16,ch = load<(volatile dereferenceable load 2 from @var + 2)> t0, t6,
undef:i32
t6: i32 = add nuw t16, Constant:i32<2>
t16: i32 = M68kISD::WrapperPC TargetGlobalAddress:i32<[2 x i16]* @var> 0
t15: i32 = TargetGlobalAddress<[2 x i16]* @var> 0
t5: i32 = Constant<2>
t3: i32 = undef
t6: i32 = add nuw t16, Constant:i32<2>
t16: i32 = M68kISD::WrapperPC TargetGlobalAddress:i32<[2 x i16]* @var> 0
t15: i32 = TargetGlobalAddress<[2 x i16]* @var> 0
t5: i32 = Constant<2>
t3: i32 = undef
In function: foo
```
After some quick study, it seems like it fail to replace `t6` with one of the
supported addressing modes (operand). So my hand-waving guess is that there are
bugs in ISel regarding pc-relative addressing modes like PCI or PCD.
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