Commit Graph

12 Commits

Author SHA1 Message Date
Jubilee Young
b807d5970b Fold aarch64 feature +fp into +neon
Arm's FEAT_FP and Feat_AdvSIMD describe the same thing on AArch64:
The Neon unit, which handles both floating point and SIMD instructions.
Moreover, a configuration for AArch64 must include both or neither.
Arm says "entirely proprietary" toolchains may omit floating point:
https://developer.arm.com/documentation/102374/0101/Data-processing---floating-point
In the Programmer's Guide for Armv8-A, Arm says AArch64 can have
both FP and Neon or neither in custom implementations:
https://developer.arm.com/documentation/den0024/a/AArch64-Floating-point-and-NEON

In "Bare metal boot code for Armv8-A", enabling Neon and FP
is just disabling the same trap flag:
https://developer.arm.com/documentation/dai0527/a

In an unlikely future where "Neon and FP" become unrelated,
we can add "[+-]fp" as its own feature flag.
Until then, we can simplify programming with Rust on AArch64 by
folding both into "[+-]neon", which is valid as it supersets both.

"[+-]neon" is retained for niche uses such as firmware, kernels,
"I just hate floats", and so on.
2022-03-22 15:14:33 -07:00
Adam Gemmell
102a0ffd37 Move is_aarch64_feature_detected! to simd_aarch64 feature and stabilise 2022-02-10 15:24:13 +00:00
Amanieu d'Antras
2188c551cd Move unstable is_{arch}_feature_detected! macros to std::arch 2022-01-28 09:51:46 +00:00
Adam Gemmell
e817b50541 Update aarch64 runtime feature detection tests 2021-08-03 12:07:56 +00:00
Adam Gemmell
d3737a6607 Remove test for crypto feature ahead of its removal 2021-05-19 16:13:52 +01:00
Jethro Beekman
9703bb8192 Fix SGX CI, take 3
Broken in #79038
2020-12-07 15:22:34 +01:00
Jethro Beekman
b787d723fc Fix SGX CI
Broken in #79038
2020-12-01 18:15:00 +01:00
Christiaan Dirkx
be554c4101 Make ui test that are run-pass and do not test the compiler itself library tests 2020-11-30 02:47:32 +01:00
DevJPM
3daa93f555 Updated documentation, x86 feature detection testing, and removed LLVM 9 exclusive features
Updated the added documentation in llvm_util.rs to note which copies of LLVM need to be inspected.
Removed avx512bf16 and avx512vp2intersect because they are unsupported before LLVM 9 with the build with external LLVM 8 being supported
Re-introduced detection testing previously removed for un-requestable features tsc and mmx
2020-10-26 08:36:14 +01:00
DevJPM
cd95e939bb Removed movbe from run-time-detect
`movbe` seems to not be a run-time detectable feature on x86.
It has thus been removed from the list.
It was only commented out to ease comparison against the full list.
2020-10-25 17:27:22 +01:00
DevJPM
9feb567399 Updated the list of white-listed target features for x86
This PR both adds in-source documentation on what to look out for
when adding a new (X86) feature set and adds all that are detectable at run-time in Rust stable
as of 1.27.0.

This should only enable the use of the corresponding LLVM intrinsics.
Actual intrinsics need to be added separately in rust-lang/stdarch.

It also re-orders the run-time-detect test statements to be more consistent
with the actual list of intrinsics whitelisted and removes underscores not present
in the actual names (which might be mistaken as being part of the name)
2020-10-25 17:06:40 +01:00
mark
2c31b45ae8 mv std libs to library/ 2020-07-27 19:51:13 -05:00