a15532d7647a8a4b7fd2889bd97f6f72f273c4bf landed a patch that added
support for detecting more AMD znver2 CPUs and cleaned up some of the
surrounding code, including the znver3 detection. Since one model group
is 00h-0fh, I adjusted the check to include checking if the value is
greater than zero. Since the value is unsigned, this is always true and
gcc warns on it. This patch removes the comparison with zero to get rid
of the compiler warning.
[builtins] Fix CPU feature detection for FreeBSD on AArch64
This is a follow-up to #75635 which broke the build for FreeBSD on
AArch64:
```
compiler-rt/lib/builtins/cpu_model/aarch64/lse_atomics/freebsd.inc:3:16: error: call to undeclared function 'elf_aux_info'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
3 | int result = elf_aux_info(AT_HWCAP, &hwcap, sizeof hwcap);
| ^
```
Using `elf_aux_info()` requires including `<sys/auxv.h>` first. To
prevent redeclaration issues with `hwcap.inc` attempting to define
`HWCAP_xxx` macros before `<sys/auxv.h>` does so, include `<sys/auxv.h>`
before any of the `.inc` files on FreeBSD.
This is a follow up to #75635 which broke the build on Fuchsia. We don't
support ifunc on Fuchsia so we shouldn't define __init_cpu_features. For
__init_cpu_features_resolver we have to use _zx_system_get_features as a
Zircon native solution.
This patch adds proper detection support for more znver2 CPUs.
Specifically, this adds in support for CPUs codenamed Renoir, Lucienne,
and Mendocino.
This was originally proposedfor Renoir in
https://reviews.llvm.org/D96220 and
got approved, but slipped through the cracks. However, there is still a
demand for this feature.
In addition to adding support for more znver2 CPUs, this patch also includes
some additional refactoring and comments related to cpu model
information for zen CPUs.
Fixes https://github.com/llvm/llvm-project/issues/74934.
