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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/99083] Big run-time regressions of 519.lbm_r with LTO
Date: Mon, 15 Feb 2021 13:31:55 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99083

--- Comment #10 from Uro=C5=A1 Bizjak <ubizjak at gmail dot com> ---
(In reply to Richard Biener from comment #7)
> There are a lot of targets that define REG_ALLOC_ORDER ^
> HONOR_REG_ALLOC_ORDER and thus are affected by this change...

The following patch should solve this issue:

--cut here--
diff --git a/gcc/defaults.h b/gcc/defaults.h
index 91216593e75..2af4add0c05 100644
--- a/gcc/defaults.h
+++ b/gcc/defaults.h
@@ -1047,7 +1047,11 @@ see the files COPYING3 and COPYING.RUNTIME respectiv=
ely.
 If not, see
 #endif

 #ifndef HONOR_REG_ALLOC_ORDER
-#define HONOR_REG_ALLOC_ORDER 0
+# if defined REG_ALLOC_ORDER
+#  define HONOR_REG_ALLOC_ORDER 1
+# else
+#  define HONOR_REG_ALLOC_ORDER 0
+# endif
 #endif

 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
--cut here--

So, if REG_ALLOC_ORDER is defined, then IRA should obey the order by defaul=
t.=