machinst: Avoid a full instructions traversal of all the blocks when computing the final block ordering;

2020-05-05 18:58:47 +02:00
parent 162fcd3d75
commit 1d90751ba9
3 changed files with 22 additions and 18 deletions
--- a/cranelift/codegen/src/machinst/lower.rs
+++ b/cranelift/codegen/src/machinst/lower.rs
@@ -332,6 +332,7 @@ impl<'func, I: VCodeInst> Lower<'func, I> {
                    GenerateReturn::Yes
                } else {
                    debug_assert!(last_insn_opcode == Opcode::FallthroughReturn);
+                    self.vcode.set_fallthrough_return_block(*bb);
                    GenerateReturn::No
                };
                self.gen_retval_setup(gen_ret);