Read bits only once.

2017-11-20 14:14:01 +01:00 · 2017-11-20 14:14:01 +01:00 · bb41b209a6
commit bb41b209a6
parent b42411e64a
1 changed files with 3 additions and 2 deletions
--- a/src/csr.rs
+++ b/src/csr.rs
@ -283,8 +283,9 @@ impl mcause::R {
    #[inline(always)]
    /// Trap Cause
    pub fn cause(&self) -> Trap {
-        let code = self.bits() & !(1 << 31);
-        match self.bits() & (1 << 31) == 1 << 31 {
+        let bits = self.bits();
+        let code = bits & !(1 << 31);
+        match bits & (1 << 31) == 1 << 31 {
            true => Trap::Interrupt(Interrupt::from(code)),
            false => Trap::Exception(Exception::from(code)),
        }