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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/100854] TS 18661-3 and backwards-incompatible setting of
 __FLT_EVAL_METHOD__
Date: Fri, 24 Dec 2021 06:14:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100854

--- Comment #3 from Hongtao.liu <crazylht at gmail dot com> ---
I'm testing

diff --git a/gcc/c-family/c-common.c b/gcc/c-family/c-common.c
index a25d59fa77b..4dab4d60773 100644
--- a/gcc/c-family/c-common.c
+++ b/gcc/c-family/c-common.c
@@ -8842,6 +8842,10 @@ excess_precision_mode_join (enum flt_eval_method x,
       || y =3D=3D FLT_EVAL_METHOD_UNPREDICTABLE)
     return FLT_EVAL_METHOD_UNPREDICTABLE;

+  /* FLT_EVAL_METHOD only accepts negative values, 0, 1 or 2, but
+     FLT_EVAL_METHOD_PROMOTE_TO_FLOAT16 is 16.  */
+    if (x =3D=3D y && x =3D=3D FLT_EVAL_METHOD_PROMOTE_TO_FLOAT16)
+      return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT;
   /* GCC only supports one interchange type right now, _Float16.  If
      we're evaluating _Float16 in 16-bit precision, then flt_eval_method
      will be FLT_EVAL_METHOD_PROMOTE_TO_FLOAT16.  */=