https://bugs.llvm.org/show_bug.cgi?id=42974

            Bug ID: 42974
           Summary: implement -ffixed-* for q* registers
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: AArch64
          Assignee: unassignedb...@nondot.org
          Reporter: ndesaulni...@google.com
                CC: arnaud.degrandmai...@arm.com,
                    llvm-bugs@lists.llvm.org, peter.sm...@linaro.org,
                    ties.st...@arm.com

For the aarch64 Linux kernel, we recently considered the use of -ffixed-* for
q* (NEON SIMD) registers. [0]

Currently, LLVM and Clang support -ffixed- for most x* registers [1], but not
any q* registers.

It's probably not too much work to implement this now in a similar fashion to
the x* registers, especially now with the monorepo.

[0] https://www.spinics.net/lists/linux-crypto/msg41373.html
[1] see r342100

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