Auto merge of #122182 - matthiaskrgr:rollup-gzimi4c, r=matthiaskrgr

Rollup of 8 pull requests

Successful merges:

 - #118623 (Improve std::fs::read_to_string example)
 - #119365 (Add asm goto support to `asm!`)
 - #120608 (Docs for std::ptr::slice_from_raw_parts)
 - #121832 (Add new Tier-3 target: `loongarch64-unknown-linux-musl`)
 - #121938 (Fix quadratic behavior of repeated vectored writes)
 - #122099 (Add  `#[inline]` to `BTreeMap::new` constructor)
 - #122103 (Make TAITs and ATPITs capture late-bound lifetimes in scope)
 - #122143 (PassWrapper: update for llvm/llvm-project@a331937197)

Failed merges:

 - #122076 (Tweak the way we protect in-place function arguments in interpreters)

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

compiler/rustc_mir_transform/src/coverage/graph.rs

@@ -349,12 +349,20 @@ fn bcb_filtered_successors<'a, 'tcx>(terminator: &'a Terminator<'tcx>) -> Covera
         | FalseUnwind { real_target: target, .. }
         | Goto { target } => CoverageSuccessors::Chainable(target),
 
-        // These terminators can normally be chained, except when they have no
+        // A call terminator can normally be chained, except when they have no
         // successor because they are known to diverge.
-        Call { target: maybe_target, .. } | InlineAsm { destination: maybe_target, .. } => {
-            match maybe_target {
-                Some(target) => CoverageSuccessors::Chainable(target),
-                None => CoverageSuccessors::NotChainable(&[]),
+        Call { target: maybe_target, .. } => match maybe_target {
+            Some(target) => CoverageSuccessors::Chainable(target),
+            None => CoverageSuccessors::NotChainable(&[]),
+        },
+
+        // An inline asm terminator can normally be chained, except when it diverges or uses asm
+        // goto.
+        InlineAsm { ref targets, .. } => {
+            if targets.len() == 1 {
+                CoverageSuccessors::Chainable(targets[0])
+            } else {
+                CoverageSuccessors::NotChainable(targets)
             }
         }
 

compiler/rustc_mir_transform/src/coverage/tests.rs

@@ -88,7 +88,6 @@ impl<'tcx> MockBlocks<'tcx> {
             | TerminatorKind::FalseEdge { real_target: ref mut target, .. }
             | TerminatorKind::FalseUnwind { real_target: ref mut target, .. }
             | TerminatorKind::Goto { ref mut target }
-            | TerminatorKind::InlineAsm { destination: Some(ref mut target), .. }
             | TerminatorKind::Yield { resume: ref mut target, .. } => *target = to_block,
             ref invalid => bug!("Invalid from_block: {:?}", invalid),
         }
@@ -185,10 +184,12 @@ fn debug_basic_blocks(mir_body: &Body<'_>) -> String {
                     | TerminatorKind::FalseEdge { real_target: target, .. }
                     | TerminatorKind::FalseUnwind { real_target: target, .. }
                     | TerminatorKind::Goto { target }
-                    | TerminatorKind::InlineAsm { destination: Some(target), .. }
                     | TerminatorKind::Yield { resume: target, .. } => {
                         format!("{}{:?}:{} -> {:?}", sp, bb, kind.name(), target)
                     }
+                    TerminatorKind::InlineAsm { targets, .. } => {
+                        format!("{}{:?}:{} -> {:?}", sp, bb, kind.name(), targets)
+                    }
                     TerminatorKind::SwitchInt { targets, .. } => {
                         format!("{}{:?}:{} -> {:?}", sp, bb, kind.name(), targets)
                     }

compiler/rustc_mir_transform/src/dest_prop.rs

@@ -648,7 +648,8 @@ impl WriteInfo {
                         }
                         InlineAsmOperand::Const { .. }
                         | InlineAsmOperand::SymFn { .. }
-                        | InlineAsmOperand::SymStatic { .. } => (),
+                        | InlineAsmOperand::SymStatic { .. }
+                        | InlineAsmOperand::Label { .. } => {}
                     }
                 }
             }

compiler/rustc_mir_transform/src/inline.rs

@@ -1036,8 +1036,8 @@ impl<'tcx> MutVisitor<'tcx> for Integrator<'_, 'tcx> {
             {
                 bug!("False unwinds should have been removed before inlining")
             }
-            TerminatorKind::InlineAsm { ref mut destination, ref mut unwind, .. } => {
-                if let Some(ref mut tgt) = *destination {
+            TerminatorKind::InlineAsm { ref mut targets, ref mut unwind, .. } => {
+                for tgt in targets.iter_mut() {
                     *tgt = self.map_block(*tgt);
                 }
                 *unwind = self.map_unwind(*unwind);