diff --git a/example/mini_core.rs b/example/mini_core.rs
index 2dd75563a..b522ea193 100644
--- a/example/mini_core.rs
+++ b/example/mini_core.rs
@@ -6,6 +6,7 @@
     extern_types,
     decl_macro,
     rustc_attrs,
+    rustc_private,
     transparent_unions,
     auto_traits,
     freeze_impls,
diff --git a/example/mini_core_hello_world.rs b/example/mini_core_hello_world.rs
index c971a7df3..10549cd2a 100644
--- a/example/mini_core_hello_world.rs
+++ b/example/mini_core_hello_world.rs
@@ -1,4 +1,13 @@
-#![feature(no_core, lang_items, never_type, linkage, extern_types, thread_local, repr_simd)]
+#![feature(
+    no_core,
+    lang_items,
+    never_type,
+    linkage,
+    extern_types,
+    thread_local,
+    repr_simd,
+    rustc_private
+)]
 #![no_core]
 #![allow(dead_code, non_camel_case_types, internal_features)]
 
diff --git a/josh-sync.toml b/josh-sync.toml
new file mode 100644
index 000000000..edd1eaadb
--- /dev/null
+++ b/josh-sync.toml
@@ -0,0 +1,2 @@
+repo = "rustc_codegen_cranelift"
+filter = ":rev(6f3f6bdacb75571a87f08e0920d9c191b3d65ded:prefix=compiler/rustc_codegen_cranelift):/compiler/rustc_codegen_cranelift"
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index b157c5879..c5c5d06c3 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,4 +1,4 @@
 [toolchain]
-channel = "nightly-2025-12-23"
+channel = "nightly-2025-12-25"
 components = ["rust-src", "rustc-dev", "llvm-tools", "rustfmt"]
 profile = "minimal"
diff --git a/rust-version b/rust-version
new file mode 100644
index 000000000..5ffe95a0b
--- /dev/null
+++ b/rust-version
@@ -0,0 +1 @@
+e7d44143a12a526488e4f0c0d7ea8e62a4fe9354
diff --git a/src/intrinsics/simd.rs b/src/intrinsics/simd.rs
index 1504869b8..bef9c6747 100644
--- a/src/intrinsics/simd.rs
+++ b/src/intrinsics/simd.rs
@@ -130,7 +130,7 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
                 return;
             }
 
-            let idx = generic_args[2].expect_const().to_value().valtree.unwrap_branch();
+            let idx = generic_args[2].expect_const().to_branch();
 
             assert_eq!(x.layout(), y.layout());
             let layout = x.layout();
@@ -143,7 +143,7 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
 
             let total_len = lane_count * 2;
 
-            let indexes = idx.iter().map(|idx| idx.unwrap_leaf().to_u32()).collect::<Vec<u32>>();
+            let indexes = idx.iter().map(|idx| idx.to_leaf().to_u32()).collect::<Vec<u32>>();
 
             for &idx in &indexes {
                 assert!(u64::from(idx) < total_len, "idx {} out of range 0..{}", idx, total_len);
@@ -961,9 +961,8 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
             let lane_clif_ty = fx.clif_type(val_lane_ty).unwrap();
             let ptr_val = ptr.load_scalar(fx);
 
-            let alignment = generic_args[3].expect_const().to_value().valtree.unwrap_branch()[0]
-                .unwrap_leaf()
-                .to_simd_alignment();
+            let alignment =
+                generic_args[3].expect_const().to_branch()[0].to_leaf().to_simd_alignment();
 
             let memflags = match alignment {
                 SimdAlign::Unaligned => MemFlags::new().with_notrap(),
@@ -1050,9 +1049,8 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
             let ret_lane_layout = fx.layout_of(ret_lane_ty);
             let ptr_val = ptr.load_scalar(fx);
 
-            let alignment = generic_args[3].expect_const().to_value().valtree.unwrap_branch()[0]
-                .unwrap_leaf()
-                .to_simd_alignment();
+            let alignment =
+                generic_args[3].expect_const().to_branch()[0].to_leaf().to_simd_alignment();
 
             let memflags = match alignment {
                 SimdAlign::Unaligned => MemFlags::new().with_notrap(),