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-rw-r--r--toolchain/gcc/patches/8.4.0/0002-xtensa-fix-PR-target-91880.patch49
1 files changed, 49 insertions, 0 deletions
diff --git a/toolchain/gcc/patches/8.4.0/0002-xtensa-fix-PR-target-91880.patch b/toolchain/gcc/patches/8.4.0/0002-xtensa-fix-PR-target-91880.patch
new file mode 100644
index 000000000..e65352501
--- /dev/null
+++ b/toolchain/gcc/patches/8.4.0/0002-xtensa-fix-PR-target-91880.patch
@@ -0,0 +1,49 @@
+From 7c11710230921246156aecc20eb4b6ccaeaaa473 Mon Sep 17 00:00:00 2001
+From: Max Filippov <jcmvbkbc@gmail.com>
+Date: Tue, 24 Sep 2019 04:15:17 -0700
+Subject: [PATCH] xtensa: fix PR target/91880
+
+Xtensa hwloop_optimize segfaults when zero overhead loop is about to be
+inserted as the first instruction of the function.
+Insert zero overhead loop instruction into new basic block before the
+loop when basic block that precedes the loop is empty.
+
+2019-09-26 Max Filippov <jcmvbkbc@gmail.com>
+gcc/
+ * config/xtensa/xtensa.c (hwloop_optimize): Insert zero overhead
+ loop instruction into new basic block before the loop when basic
+ block that precedes the loop is empty.
+
+Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
+---
+Backported from: r276166
+
+ gcc/config/xtensa/xtensa.c | 5 ++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)
+
+diff --git a/gcc/config/xtensa/xtensa.c b/gcc/config/xtensa/xtensa.c
+index ee5612441e25..2527468d57db 100644
+--- a/gcc/config/xtensa/xtensa.c
++++ b/gcc/config/xtensa/xtensa.c
+@@ -4232,7 +4232,9 @@ hwloop_optimize (hwloop_info loop)
+
+ seq = get_insns ();
+
+- if (!single_succ_p (entry_bb) || vec_safe_length (loop->incoming) > 1)
++ entry_after = BB_END (entry_bb);
++ if (!single_succ_p (entry_bb) || vec_safe_length (loop->incoming) > 1
++ || !entry_after)
+ {
+ basic_block new_bb;
+ edge e;
+@@ -4253,7 +4255,6 @@ hwloop_optimize (hwloop_info loop)
+ }
+ else
+ {
+- entry_after = BB_END (entry_bb);
+ while (DEBUG_INSN_P (entry_after)
+ || (NOTE_P (entry_after)
+ && NOTE_KIND (entry_after) != NOTE_INSN_BASIC_BLOCK))
+--
+2.11.0
+