[LLVMbugs] [Bug 21066] New: When assembling, report multiple potential instructions with missing features.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21066

            Bug ID: 21066
           Summary: When assembling, report multiple potential
                    instructions with missing features.
           Product: libraries
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: LLVM assembly language parser
          Assignee: unassignedbugs at nondot.org
          Reporter: oliver.stannard at arm.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

When the LLVM assembler does not find a matching instruction, but does find
instructions which would match if more target features were available, it
attempts to report the missing features. However, if there are multiple such
instructions, it currently only reports the one with the fewest missing
features, which is often not the most useful one.

For example, assembling "adds r0, #0x100" for Thumb1 will result in an error
message claiming that the "arm-mode" feature is required, but there is also a
version of the instruction which is available for Thumb2. In this case, it
would be better to report both of these potential matches.

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