From 84e835aa1cd2dd0d4940377c04a28917c5ea7a1e Mon Sep 17 00:00:00 2001
From: Tony Arcieri <bascule@gmail.com>
Date: Thu, 22 Oct 2026 21:44:27 -0600
Subject: [PATCH] ctutils: import `core::hint::black_box` in `primitives`
 module

---
 ctutils/src/primitives.rs | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/ctutils/src/primitives.rs b/ctutils/src/primitives.rs
index f1060a57..d2fc677c 100644
--- a/ctutils/src/primitives.rs
+++ b/ctutils/src/primitives.rs
@@ -7,7 +7,9 @@
 //! be checked for the target and compiler in use.
 //!
 //! Native zero counts are used when supported and advertised by the target configuration.
+
 use crate::Choice;
+use core::hint::black_box;
 
 /// Bitwise less-than-or equal: returns `1` if `x <= y`, and otherwise returns `0`.
 ///
@@ -52,7 +54,7 @@ macro_rules! comparison_primitives {
         pub(crate) const fn $le(lhs: $ty, rhs: $ty) -> Choice {
             let bit = bitle!(lhs, rhs, <$ty>::BITS);
             #[cfg(all(target_arch = "arm", not(target_has_atomic = "ptr")))]
-            let bit = core::hint::black_box(bit);
+            let bit = black_box(bit);
             Choice::$from_lsb(bit)
         }
 
@@ -67,7 +69,7 @@ macro_rules! comparison_primitives {
         pub(crate) const fn $lt(lhs: $ty, rhs: $ty) -> Choice {
             let bit = bitlt!(lhs, rhs, <$ty>::BITS);
             #[cfg(all(target_arch = "arm", not(target_has_atomic = "ptr")))]
-            let bit = core::hint::black_box(bit);
+            let bit = black_box(bit);
             Choice::$from_lsb(bit)
         }
 
@@ -75,7 +77,7 @@ macro_rules! comparison_primitives {
         pub(crate) const fn $nz(value: $ty) -> Choice {
             let bit = bitnz!(value, <$ty>::BITS);
             #[cfg(all(target_arch = "arm", not(target_has_atomic = "ptr")))]
-            let bit = core::hint::black_box(bit);
+            let bit = black_box(bit);
             Choice::$from_lsb(bit)
         }
     };
@@ -98,7 +100,7 @@ macro_rules! borrowing_sub_primitives {
             // optimization on older compilers: https://github.com/rust-lang/rust/issues/149522
             // Keep the full-width bit opaque before narrowing it to Choice, so a caller's
             // masked add-back cannot be folded into a secret-dependent branch.
-            let borrow = core::hint::black_box(bitborrow!(lhs, rhs, difference, <$ty>::BITS));
+            let borrow = black_box(bitborrow!(lhs, rhs, difference, <$ty>::BITS));
             (difference, Choice::$from_lsb(borrow))
         }
     };