50 lines
1.6 KiB
Diff
50 lines
1.6 KiB
Diff
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From 7c11710230921246156aecc20eb4b6ccaeaaa473 Mon Sep 17 00:00:00 2001
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From: Max Filippov <jcmvbkbc@gmail.com>
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Date: Tue, 24 Sep 2019 04:15:17 -0700
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Subject: [PATCH] xtensa: fix PR target/91880
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Xtensa hwloop_optimize segfaults when zero overhead loop is about to be
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inserted as the first instruction of the function.
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Insert zero overhead loop instruction into new basic block before the
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loop when basic block that precedes the loop is empty.
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2019-09-26 Max Filippov <jcmvbkbc@gmail.com>
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gcc/
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* config/xtensa/xtensa.c (hwloop_optimize): Insert zero overhead
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loop instruction into new basic block before the loop when basic
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block that precedes the loop is empty.
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Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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---
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Backported from: r276166
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gcc/config/xtensa/xtensa.c | 5 ++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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diff --git a/gcc/config/xtensa/xtensa.c b/gcc/config/xtensa/xtensa.c
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index ee5612441e25..2527468d57db 100644
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--- a/gcc/config/xtensa/xtensa.c
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+++ b/gcc/config/xtensa/xtensa.c
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@@ -4235,7 +4235,9 @@ hwloop_optimize (hwloop_info loop)
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seq = get_insns ();
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- if (!single_succ_p (entry_bb) || vec_safe_length (loop->incoming) > 1)
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+ entry_after = BB_END (entry_bb);
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+ if (!single_succ_p (entry_bb) || vec_safe_length (loop->incoming) > 1
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+ || !entry_after)
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{
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basic_block new_bb;
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edge e;
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@@ -4256,7 +4258,6 @@ hwloop_optimize (hwloop_info loop)
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}
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else
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{
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- entry_after = BB_END (entry_bb);
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while (DEBUG_INSN_P (entry_after)
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|| (NOTE_P (entry_after)
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&& NOTE_KIND (entry_after) != NOTE_INSN_BASIC_BLOCK))
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--
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2.11.0
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