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Do not create new resume block if there isn't one already

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This commit is contained in:
Gary Guo 2023-06-28 15:16:11 +01:00
parent 0f7f6b7061
commit cfbf1bf7cd
1 changed files with 13 additions and 3 deletions
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16
compiler/rustc_mir_transform/src/remove_noop_landing_pads.rs
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@ -6,8 +6,8 @@ use rustc_middle::ty::TyCtxt;
use rustc_target::spec::PanicStrategy;
/// A pass that removes noop landing pads and replaces jumps to them with
/// `None`. This is important because otherwise LLVM generates terrible
/// code for these.
/// `UnwindAction::Continue`. This is important because otherwise LLVM generates
/// terrible code for these.
pub struct RemoveNoopLandingPads;
impl<'tcx> MirPass<'tcx> for RemoveNoopLandingPads {
@ -84,7 +84,17 @@ impl RemoveNoopLandingPads {
fn remove_nop_landing_pads(&self, body: &mut Body<'_>) {
debug!("body: {:#?}", body);
// make sure there's a resume block
// Skip the pass if there are no blocks with a resume terminator.
let has_resume = body
.basic_blocks
.iter_enumerated()
.any(|(_bb, block)| matches!(block.terminator().kind, TerminatorKind::Resume));
if !has_resume {
debug!("remove_noop_landing_pads: no resume block in MIR");
return;
}
// make sure there's a resume block without any statements
let resume_block = {
let mut patch = MirPatch::new(body);
let resume_block = patch.resume_block();