From 320c55590cc30d4ef5b2c1a226f0f940a6bdb445 Mon Sep 17 00:00:00 2001
From: Xavier Leroy <xavier.leroy@college-de-france.fr>
Date: Sun, 25 Apr 2021 13:57:47 +0200
Subject: Support __builtin_unreachable

Not yet used for optimizations.
---
 x86/Asmexpand.ml | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'x86')

diff --git a/x86/Asmexpand.ml b/x86/Asmexpand.ml
index 14cbb373..d757d7c2 100644
--- a/x86/Asmexpand.ml
+++ b/x86/Asmexpand.ml
@@ -487,9 +487,12 @@ let expand_builtin_inline name args res =
   (* Synchronization *)
   | "__builtin_membar", [], _ ->
      ()
-  (* no operation *)
+  (* No operation *)
   | "__builtin_nop", [], _ ->
      emit Pnop
+  (* Optimization hint *)
+  | "__builtin_unreachable", [], _ ->
+     ()
   (* Catch-all *)
   | _ ->
      raise (Error ("unrecognized builtin " ^ name))
-- 
cgit