Auto merge of #105703 - matthiaskrgr:rollup-tfpeam2, r=matthiaskrgr

Rollup of 7 pull requests

Successful merges:

 - #105399 (Use more LFS functions.)
 - #105578 (Fix transmutes between pointers in different address spaces (e.g. fn ptrs on AVR))
 - #105598 (explain mem::forget(env_lock) in fork/exec)
 - #105624 (Fix unsoundness in bootstrap cache code)
 - #105630 (Add a test for #92481)
 - #105684 (Improve rustdoc markdown variable naming)
 - #105697 (Remove fee1-dead from reviewers)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

1 files changed, 9 insertions, 4 deletions

diff --git a/compiler/rustc_codegen_ssa/src/mir/block.rs b/compiler/rustc_codegen_ssa/src/mir/block.rs
index 58dfd17fb36..3860138018b 100644
--- a/compiler/rustc_codegen_ssa/src/mir/block.rs
+++ b/compiler/rustc_codegen_ssa/src/mir/block.rs
@@ -1802,15 +1802,20 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
         match (src.layout.abi, dst.layout.abi) {
             (abi::Abi::Scalar(src_scalar), abi::Abi::Scalar(dst_scalar)) => {
                 // HACK(eddyb) LLVM doesn't like `bitcast`s between pointers and non-pointers.
-                if (src_scalar.primitive() == abi::Pointer)
-                    == (dst_scalar.primitive() == abi::Pointer)
-                {
+                let src_is_ptr = src_scalar.primitive() == abi::Pointer;
+                let dst_is_ptr = dst_scalar.primitive() == abi::Pointer;
+                if src_is_ptr == dst_is_ptr {
                     assert_eq!(src.layout.size, dst.layout.size);
 
                     // NOTE(eddyb) the `from_immediate` and `to_immediate_scalar`
                     // conversions allow handling `bool`s the same as `u8`s.
                     let src = bx.from_immediate(src.immediate());
-                    let src_as_dst = bx.bitcast(src, bx.backend_type(dst.layout));
+                    // LLVM also doesn't like `bitcast`s between pointers in different address spaces.
+                    let src_as_dst = if src_is_ptr {
+                        bx.pointercast(src, bx.backend_type(dst.layout))
+                    } else {
+                        bx.bitcast(src, bx.backend_type(dst.layout))
+                    };
                     Immediate(bx.to_immediate_scalar(src_as_dst, dst_scalar)).store(bx, dst);
                     return;
                 }