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Use fallback on emscripten targets

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This commit is contained in:
gnzlbg 2019-03-26 09:12:06 +01:00
parent 24db517419
commit d189cab027
1 changed files with 18 additions and 2 deletions
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20
src/libcore/hint.rs
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@ -99,13 +99,29 @@ pub fn spin_loop() {
/// This function is a no-op, and does not even read from `dummy`.
#[unstable(feature = "test", issue = "27812")]
pub fn black_box<T>(dummy: T) -> T {
#[cfg(not(target_arch = "asmjs"))] {
#[cfg(not(
any(
target_arch = "asmjs",
all(
target_arch = "wasm32",
target_os = "emscripten"
)
)
))] {
// we need to "use" the argument in some way LLVM can't
// introspect.
unsafe { asm!("" : : "r"(&dummy)) }
dummy
}
#[cfg(target_arch = "asmjs")] {
#[cfg(
any(
target_arch = "asmjs",
all(
target_arch = "wasm32",
target_os = "emscripten"
)
)
)] {
unsafe {
let ret = crate::ptr::read_volatile(&dummy);
crate::mem::forget(dummy);