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Keep unstable target features for asm feature checking

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Inline assembly uses the target features to determine which registers
are available on the current target. However it needs to be able to
access unstable target features for this.

Fixes #99071
This commit is contained in:
Amanieu d'Antras
2022-07-11 14:26:58 +01:00
parent 50b00252ae
commit e51f1b7e27
8 changed files with 38 additions and 28 deletions
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39
compiler/rustc_codegen_llvm/src/llvm_util.rs
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@@ -233,26 +233,29 @@ pub fn check_tied_features(
// Used to generate cfg variables and apply features
// Must express features in the way Rust understands them
pub fn target_features(sess: &Session) -> Vec<Symbol> {
pub fn target_features(sess: &Session, allow_unstable: bool) -> Vec<Symbol> {
let target_machine = create_informational_target_machine(sess);
let mut features: Vec<Symbol> =
supported_target_features(sess)
.iter()
.filter_map(|&(feature, gate)| {
if sess.is_nightly_build() || gate.is_none() { Some(feature) } else { None }
})
.filter(|feature| {
// check that all features in a given smallvec are enabled
for llvm_feature in to_llvm_features(sess, feature) {
let cstr = SmallCStr::new(llvm_feature);
if !unsafe { llvm::LLVMRustHasFeature(target_machine, cstr.as_ptr()) } {
return false;
}
let mut features: Vec<Symbol> = supported_target_features(sess)
.iter()
.filter_map(|&(feature, gate)| {
if sess.is_nightly_build() || allow_unstable || gate.is_none() {
Some(feature)
} else {
None
}
})
.filter(|feature| {
// check that all features in a given smallvec are enabled
for llvm_feature in to_llvm_features(sess, feature) {
let cstr = SmallCStr::new(llvm_feature);
if !unsafe { llvm::LLVMRustHasFeature(target_machine, cstr.as_ptr()) } {
return false;
}
true
})
.map(|feature| Symbol::intern(feature))
.collect();
}
true
})
.map(|feature| Symbol::intern(feature))
.collect();
// LLVM 14 changed the ABI for i128 arguments to __float/__fix builtins on Win64
// (see https://reviews.llvm.org/D110413). This unstable target feature is intended for use