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Auto merge of #38579 - whitequark:min_atomic_width, r=alexcrichton

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Add a min_atomic_width target option, like max_atomic_width

Rationale: some ISAs, e.g. OR1K, do not have atomic instructions
for byte and halfword access, and at the same time do not have
a fixed endianness, which makes it unreasonable to implement these
through word-sized atomic accesses.
This commit is contained in:
bors 2016-12-28 04:12:11 +00:00
commit 0807104c8f
2 changed files with 14 additions and 1 deletions
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3
src/librustc/session/config.rs
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@ -943,6 +943,7 @@ pub fn default_configuration(sess: &Session) -> ast::CrateConfig {
let os = &sess.target.target.target_os;
let env = &sess.target.target.target_env;
let vendor = &sess.target.target.target_vendor;
let min_atomic_width = sess.target.target.min_atomic_width();
let max_atomic_width = sess.target.target.max_atomic_width();
let mut ret = HashSet::new();
@ -963,7 +964,7 @@ pub fn default_configuration(sess: &Session) -> ast::CrateConfig {
ret.insert((Symbol::intern("target_thread_local"), None));
}
for &i in &[8, 16, 32, 64, 128] {
if i <= max_atomic_width {
if i >= min_atomic_width && i <= max_atomic_width {
let s = i.to_string();
ret.insert((Symbol::intern("target_has_atomic"), Some(Symbol::intern(&s))));
if &s == wordsz {