Add PAUSE instruction to RISC-V core::arch

Use `#[inline]` instead of `#[inline(always)]`
rust-lang · Dec 4, 2021 · 1a9eec3 · 1a9eec3
1 parent 6239a24
commit 1a9eec3
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/crates/core_arch/src/riscv/mod.rs b/crates/core_arch/src/riscv/mod.rs
@@ -1 +1,10 @@
 //! RISC-V intrinsics
+
+/// Generates the `PAUSE` instruction
+///
+/// The PAUSE instruction is a HINT that indicates the current hart's rate of instruction retirement
+/// should be temporarily reduced or paused. The duration of its effect must be bounded and may be zero.
+#[inline]
+pub fn pause() {
+    unsafe { asm!(".word 0x0100000F", options(nomem, nostack)) }
+}