[llvm-bugs] [Bug 44562] New: [ARM] "Invalid register name" for global register vairables

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44562

            Bug ID: 44562
           Summary: [ARM] "Invalid register name" for global register
                    vairables
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: ARM
          Assignee: unassignedbugs at nondot.org
          Reporter: ndesaulniers at google.com
                CC: kristof.beyls at arm.com, llozano at chromium.org,
                    llvm-bugs at lists.llvm.org, peter.smith at linaro.org,
                    srhines at google.com, Ties.Stuij at arm.com

Trying to compile U-Boot w/ Clang to remove GCC from Android, I hit the
following build error w/ Clang:


```
register int foo asm("r9");

void bar(void) {
    foo = 0;
}
```
https://godbolt.org/z/_wQi9A

produces:
fatal error: error in backend: Invalid register name "r9".


using "w" still errors, but is not fatal.

This code comes from:
Declaration:
https://gitlab.denx.de/u-boot/u-boot/blob/9d5d74c3ccdc78bac969d25e98eab96872e33b5c/arch/arm/include/asm/global_data.h#L85-114

Use:
1.
https://gitlab.denx.de/u-boot/u-boot/blob/9d5d74c3ccdc78bac969d25e98eab96872e33b5c/lib/efi_loader/efi_boottime.c#L91
2.
https://gitlab.denx.de/u-boot/u-boot/blob/9d5d74c3ccdc78bac969d25e98eab96872e33b5c/lib/efi_loader/efi_boottime.c#L101
3.
https://gitlab.denx.de/u-boot/u-boot/blob/9d5d74c3ccdc78bac969d25e98eab96872e33b5c/lib/efi_loader/efi_boottime.c#L125

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