[llvm-bugs] [Bug 48805] New: llvm_unreachable when assembling an LDR with UXTW modifier

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48805

            Bug ID: 48805
           Summary: llvm_unreachable when assembling an LDR with UXTW
                    modifier
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: ARM
          Assignee: unassignedbugs at nondot.org
          Reporter: peter at pcc.me.uk
                CC: llvm-bugs at lists.llvm.org, smithp352 at googlemail.com,
                    Ties.Stuij at arm.com

We hit an llvm_unreachable when assembling the following instruction:

ldr r0, [ r0, r2, uxtw #2 ]

This instruction is invalid because UXTW is not a valid modifier for LDR on
32-bit ARM, so we should reject it.

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