[llvm-bugs] [Bug 30955] New: Assembler for arm64 ignores padding value of 0 for .balign directive

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30955

            Bug ID: 30955
           Summary: Assembler for arm64 ignores padding value of 0 for
                    .balign directive
           Product: new-bugs
           Version: 3.8
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: jon.nall at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

When a specific padding value of 0 is passed to a .balign directive in an
executable area, the value is ignored and NOP instructions are inserted
instead.

The value is respected for the .balignw .balignl variants. Further, if a
non-zero value is specified, it's respected.

Shouldn't an explicit 0 padding value be respected for .balign?

Reproducer:

// Contents of foo.S
.section TestSection, "x"
  add x14, x14, 0x1
  .balign 0x10, 0
  add x14, x14, 0x1
.end

Command line:
clang -target arm64-unknown-linux -c -o foo.o foo.S

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