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Add runtime detection for APX-F and AVX10
This was missed in rust-lang/rust#139534 and rust-lang/rust#139675
`@rustbot` label O-x86_64 O-x86_32 A-target-feature
r? `@Amanieu`
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std_detect: RISC-V platform guide documentation
This is practically a revert of a revert, making the commit e907456b2e10622ccd854a3bba8d02ce170b5dbb on `stdarch` come around again with minor fixes, enhancements and adjustments.
An excerpt from the original commit message follows:
Since there's no architectural feature detection on RISC-V (unlike `CPUID` on x86 architectures and some system registers on Arm/AArch64), runtime feature detection entirely depends on the platform-specific facility.
As a result, availability of each feature heavily depends on the platform and its version.
To help users make a decision for feature checking on a RISC-V system, this commit adds a platform guide with minimum supported platform versions.
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rustc_target: Add the `32s` target feature for LoongArch
LLVM: https://github.com/llvm/llvm-project/pull/139695
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Migrate the standard library from using the external `cfg_if` crate to
using the now-built-in `cfg_select` macro.
This does not yet eliminate the dependency from
`library/std/Cargo.toml`, because while the standard library itself no
longer uses `cfg_if`, it also incorporates the `backtrace` crate, which
does.
Migration assisted by the following vim command (after selecting the
full `cfg_if!` invocation):
```
'<,'>s/\(cfg_if::\)\?cfg_if/cfg_select/ | '<,'>s/^\( *\)} else {/\1}\r\1_ => {/c | '<,'>s/^\( *\)} else if #\[cfg(\(.*\))\] /\1}\r\1\2 => /e | '<,'>s/if #\[cfg(\(.*\))\] {/\1 => {/e
```
This is imperfect, but substantially accelerated the process. This
prompts for confirmation on the `} else {` since that can also appear
inside one of the arms. This also requires manual intervention to handle
any multi-line conditions.
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This is practically a revert of a revert, making the
commit e907456b2e10622ccd854a3bba8d02ce170b5dbb on `stdarch` come around
again with minor fixes, enhancements and adjustments.
An excerpt from the original commit message follows:
Since there's no architectural feature detection on RISC-V (unlike `CPUID`
on x86 architectures and some system registers on Arm/AArch64), runtime
feature detection entirely depends on the platform-specific facility.
As a result, availability of each feature heavily depends on the platform
and its version.
To help users make a decision for feature checking on a RISC-V system, this
commit adds a platform guide with minimum supported platform versions.
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It adds feature detection of 1 extension (new in std_detect).
New RISC-V Extension:
1. "Zabha"
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