1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
From 6d0d3ae914bf19706550a539ef304c5875535ffc Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <siarheit@google.com>
Date: Fri, 3 Jul 2020 22:50:33 +0100
Subject: [PATCH] Disable -fdelayed-branch by default.
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.
Reported-by: Jeroen Roovers
Bug: https://gcc.gnu.org/PR96015
Bug: https://bugs.gentoo.org/729570.
Signed-off-by: Sergei Trofimovich <siarheit@google.com>
---
gcc/opts.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
--- a/gcc/opts.c
+++ b/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 },
--
2.27.0
|
GitWeb
