[llvm-bugs] [Bug 32873] New: .arch/.cpu without extra features is ignored

via llvm-bugs llvm-bugs at lists.llvm.org
Mon May 1 17:37:42 PDT 2017


            Bug ID: 32873
           Summary: .arch/.cpu without extra features is ignored
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: AArch64
          Assignee: unassignedbugs at nondot.org
          Reporter: ahmed.bougacha at gmail.com
                CC: llvm-bugs at lists.llvm.org

According to

"Specifying .arch clears any previously selected architecture extensions."

And yet, this is accepted:
  .arch v8.2a+ras
  .arch v8

But this is rejected:
  .arch v8.2a+ras
  .arch v8+noras

  error: instruction requires: ras

Even though they look semantically identical to me.

The logic in parseDirectiveCpu/parseDirectiveArch only ever calls
setAvailableFeatures if there was an extra "+feature" specified.
Should it also do it unconditionally on the default arch/cpu features?

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