diff --git a/src/librustc_mir/build/cfg.rs b/src/librustc_mir/build/cfg.rs
index 71e97e4bfe0d3..c503b8c7fe06f 100644
--- a/src/librustc_mir/build/cfg.rs
+++ b/src/librustc_mir/build/cfg.rs
@@ -25,6 +25,9 @@ impl<'tcx> CFG<'tcx> {
         &mut self.basic_blocks[blk]
     }
 
+    // llvm.org/PR32488 makes this function use an excess of stack space. Mark
+    // it as #[inline(never)] to keep rustc's stack use in check.
+    #[inline(never)]
     pub fn start_new_block(&mut self) -> BasicBlock {
         self.basic_blocks.push(BasicBlockData::new(None))
     }