From 342a75ee90a7cefdbb53ad7040a0985651e6c1ab Mon Sep 17 00:00:00 2001
From: Folkert de Vries <folkert@folkertdev.nl>
Date: Sun, 20 Apr 2025 22:00:58 +0200
Subject: [PATCH] support `-Zmin-function-alignment`

---
 src/lib.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/lib.rs b/src/lib.rs
index b86a549f5..6292606ae 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -280,6 +280,12 @@ fn build_isa(sess: &Session, jit: bool) -> Arc<dyn TargetIsa + 'static> {
 
     flags_builder.set("enable_llvm_abi_extensions", "true").unwrap();
 
+    if let Some(align) = sess.opts.unstable_opts.min_function_alignment {
+        flags_builder
+            .set("log2_min_function_alignment", &align.bytes().ilog2().to_string())
+            .unwrap();
+    }
+
     use rustc_session::config::OptLevel;
     match sess.opts.optimize {
         OptLevel::No => {