@@ -, +, @@ 
---
 gcc/opts.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
--- a/gcc/opts.c	
+++ a/gcc/opts.c	
@@ -458,7 +458,14 @@ static const struct default_options default_options_table[] =
     /* -O1 (and not -Og) optimizations.  */
     { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fbranch_count_reg, NULL, 1 },
 #if DELAY_SLOTS
-    { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fdelayed_branch, NULL, 1 },
+    /*
+     * From https://gcc.gnu.org/PR96015 / https://bugs.gentoo.org/729570.
+     * delayed branches are known to generate invalid code around
+     * __builtin_unreachable(); and mis-compiles python.
+     *
+     * Use blunt hammer and disable delayed slots until we have better fix.
+     */
+    /* { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fdelayed_branch, NULL, 1 }, */
 #endif
     { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fdse, NULL, 1 },
     { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fif_conversion, NULL, 1 },
--