From: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
To: linux-sparse@vger.kernel.org
Cc: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Subject: [PATCH 2/2] fix rem_usage()
Date: Sun, 27 Dec 2020 10:27:59 +0100 [thread overview]
Message-ID: <20201227092759.30999-3-luc.vanoostenryck@gmail.com> (raw)
In-Reply-To: <20201227092759.30999-1-luc.vanoostenryck@gmail.com>
rem_usage() is used to remove an element from a def-use chain. Optionally,
if the chain become empty, the defining instruction can also be killed.
This optional part is currently be done on all pseudos but only those
having a definition should be concerned.
Fix this by adding a check so that only PSEUDO_REGs and PSEUDO_PHIs are killed.
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
---
simplify.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/simplify.c b/simplify.c
index a877b693b610..12482d787189 100644
--- a/simplify.c
+++ b/simplify.c
@@ -271,7 +271,7 @@ static inline void rem_usage(pseudo_t p, pseudo_t *usep, int kill)
{
if (has_use_list(p)) {
delete_pseudo_user_list_entry(&p->users, usep, 1);
- if (kill && !p->users)
+ if (kill && !p->users && has_definition(p))
kill_instruction(p->def);
}
}
--
2.29.2
next prev parent reply other threads:[~2020-12-27 9:29 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-27 9:27 [PATCH 0/2] fix rem_usage() Luc Van Oostenryck
2020-12-27 9:27 ` [PATCH 1/2] add helper has_definition() Luc Van Oostenryck
2020-12-28 17:20 ` Ramsay Jones
2020-12-27 9:27 ` Luc Van Oostenryck [this message]
2020-12-28 17:22 ` [PATCH 2/2] fix rem_usage() Ramsay Jones
2020-12-28 21:39 ` Luc Van Oostenryck
2020-12-28 22:09 ` Ramsay Jones
2020-12-28 22:30 ` Ramsay Jones
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