From: Xi Ruoyao <xry111@mengyan1223.wang>
To: gcc-patches@gcc.gnu.org
Cc: Richard Sandiford <richard.sandiford@arm.com>
Subject: [PATCH] vect: fix out-of-bound access in supports_vec_convert_optab_p [PR 104851]
Date: Wed, 09 Mar 2022 12:05:53 +0800 [thread overview]
Message-ID: <2a4f73f067275a669c841722d66b274768d21851.camel@mengyan1223.wang> (raw)
This should be obvious, OK for trunk?
-- >8 --
Calling VECTOR_MODE_P with MAX_MACHINE_MODE has caused out-of-bound
access.
gcc/
PR tree-optimization/104851
* optabs-query.cc (supports_vec_convert_optab_p): Fix off-by-one
error.
---
gcc/optabs-query.cc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/gcc/optabs-query.cc b/gcc/optabs-query.cc
index 713c098ba4e..68dc679cc6a 100644
--- a/gcc/optabs-query.cc
+++ b/gcc/optabs-query.cc
@@ -720,7 +720,7 @@ static bool
supports_vec_convert_optab_p (optab op, machine_mode mode)
{
int start = mode == VOIDmode ? 0 : mode;
- int end = mode == VOIDmode ? MAX_MACHINE_MODE : mode;
+ int end = mode == VOIDmode ? MAX_MACHINE_MODE - 1 : mode;
for (int i = start; i <= end; ++i)
if (VECTOR_MODE_P ((machine_mode) i))
for (int j = MIN_MODE_VECTOR_INT; j < MAX_MODE_VECTOR_INT; ++j)
--
2.35.1
next reply other threads:[~2022-03-09 4:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-09 4:05 Xi Ruoyao [this message]
2022-03-09 8:37 ` Richard Biener
2022-03-09 10:57 ` Xi Ruoyao
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