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Add compiler support for LLVM's x86 ERMSB feature

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This change is needed for compiler-builtins to check for this feature
when implementing memcpy/memset. See:
  https://github.com/rust-lang/compiler-builtins/pull/365

The change just does compile-time detection. I think that runtime
detection will have to come in a follow-up CL to std-detect.

Like all the CPU feature flags, this just references #44839

Signed-off-by: Joe Richey <joerichey@google.com>
This commit is contained in:
Joe Richey 2020-10-26 03:46:54 -07:00
parent 8e6f69afc9
commit ad552bc17e
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6 changed files with 6 additions and 1 deletions
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compiler/rustc_feature/src/active.rs
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@ -238,6 +238,7 @@ declare_features! (
(active, rtm_target_feature, "1.35.0", Some(44839), None),
(active, f16c_target_feature, "1.36.0", Some(44839), None),
(active, riscv_target_feature, "1.45.0", Some(44839), None),
(active, ermsb_target_feature, "1.49.0", Some(44839), None),
// -------------------------------------------------------------------------
// feature-group-end: actual feature gates (target features)