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From: Adrian Ratiu <adrian.ratiu@collabora.com>
To: linux-arm-kernel@lists.infradead.org
Cc: Nathan Chancellor <natechancellor@gmail.com>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Arnd Bergmann <arnd@arndb.de>,
	clang-built-linux@googlegroups.com,
	Russell King <linux@armlinux.org.uk>,
	linux-kernel@vger.kernel.org, kernel@collabora.com
Subject: [PATCH 1/2] arm: lib: xor-neon: remove unnecessary GCC < 4.6 warning
Date: Fri,  6 Nov 2020 07:14:35 +0200	[thread overview]
Message-ID: <20201106051436.2384842-2-adrian.ratiu@collabora.com> (raw)
In-Reply-To: <20201106051436.2384842-1-adrian.ratiu@collabora.com>

From: Nathan Chancellor <natechancellor@gmail.com>

Drop warning because kernel now requires GCC >= v4.9 after
commit 6ec4476ac825 ("Raise gcc version requirement to 4.9").

Reported-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
---
 arch/arm/lib/xor-neon.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/arch/arm/lib/xor-neon.c b/arch/arm/lib/xor-neon.c
index b99dd8e1c93f..e1e76186ec23 100644
--- a/arch/arm/lib/xor-neon.c
+++ b/arch/arm/lib/xor-neon.c
@@ -19,15 +19,8 @@ MODULE_LICENSE("GPL");
  * -ftree-vectorize) to attempt to exploit implicit parallelism and emit
  * NEON instructions.
  */
-#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
+#ifdef CONFIG_CC_IS_GCC
 #pragma GCC optimize "tree-vectorize"
-#else
-/*
- * While older versions of GCC do not generate incorrect code, they fail to
- * recognize the parallel nature of these functions, and emit plain ARM code,
- * which is known to be slower than the optimized ARM code in asm-arm/xor.h.
- */
-#warning This code requires at least version 4.6 of GCC
 #endif
 
 #pragma GCC diagnostic ignored "-Wunused-variable"
-- 
2.29.0


WARNING: multiple messages have this Message-ID (diff)
From: Adrian Ratiu <adrian.ratiu@collabora.com>
To: linux-arm-kernel@lists.infradead.org
Cc: Arnd Bergmann <arnd@arndb.de>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Russell King <linux@armlinux.org.uk>,
	linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com,
	Nathan Chancellor <natechancellor@gmail.com>,
	kernel@collabora.com
Subject: [PATCH 1/2] arm: lib: xor-neon: remove unnecessary GCC < 4.6 warning
Date: Fri,  6 Nov 2020 07:14:35 +0200	[thread overview]
Message-ID: <20201106051436.2384842-2-adrian.ratiu@collabora.com> (raw)
In-Reply-To: <20201106051436.2384842-1-adrian.ratiu@collabora.com>

From: Nathan Chancellor <natechancellor@gmail.com>

Drop warning because kernel now requires GCC >= v4.9 after
commit 6ec4476ac825 ("Raise gcc version requirement to 4.9").

Reported-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
---
 arch/arm/lib/xor-neon.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/arch/arm/lib/xor-neon.c b/arch/arm/lib/xor-neon.c
index b99dd8e1c93f..e1e76186ec23 100644
--- a/arch/arm/lib/xor-neon.c
+++ b/arch/arm/lib/xor-neon.c
@@ -19,15 +19,8 @@ MODULE_LICENSE("GPL");
  * -ftree-vectorize) to attempt to exploit implicit parallelism and emit
  * NEON instructions.
  */
-#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
+#ifdef CONFIG_CC_IS_GCC
 #pragma GCC optimize "tree-vectorize"
-#else
-/*
- * While older versions of GCC do not generate incorrect code, they fail to
- * recognize the parallel nature of these functions, and emit plain ARM code,
- * which is known to be slower than the optimized ARM code in asm-arm/xor.h.
- */
-#warning This code requires at least version 4.6 of GCC
 #endif
 
 #pragma GCC diagnostic ignored "-Wunused-variable"
-- 
2.29.0


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  reply	other threads:[~2020-11-06  5:14 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-06  5:14 [PATCH 0/2] arm: lib: xor-neon: Remove warn & disble neon vect Adrian Ratiu
2020-11-06  5:14 ` Adrian Ratiu
2020-11-06  5:14 ` Adrian Ratiu [this message]
2020-11-06  5:14   ` [PATCH 1/2] arm: lib: xor-neon: remove unnecessary GCC < 4.6 warning Adrian Ratiu
2020-11-06 14:46   ` Arnd Bergmann
2020-11-06 14:46     ` Arnd Bergmann
2020-11-06 18:03     ` Nathan Chancellor
2020-11-06 18:03       ` Nathan Chancellor
2020-11-06 21:46       ` Arnd Bergmann
2020-11-06 21:46         ` Arnd Bergmann
2020-11-06  5:14 ` [PATCH 2/2] arm: lib: xor-neon: disable clang vectorization Adrian Ratiu
2020-11-06  5:14   ` Adrian Ratiu
2020-11-06 10:14   ` Nathan Chancellor
2020-11-06 10:14     ` Nathan Chancellor
2020-11-06 11:50     ` Adrian Ratiu
2020-11-06 11:50       ` Adrian Ratiu
2020-11-06 18:01       ` Nathan Chancellor
2020-11-06 18:01         ` Nathan Chancellor
2020-11-06 19:52       ` Nick Desaulniers
2020-11-06 19:52         ` Nick Desaulniers
2020-11-07 18:07         ` Adrian Ratiu
2020-11-07 18:07           ` Adrian Ratiu
2020-11-09 19:53         ` Adrian Ratiu
2020-11-09 19:53           ` Adrian Ratiu
2020-11-10 21:41           ` Nick Desaulniers
2020-11-10 21:41             ` Nick Desaulniers
2020-11-10 22:15             ` Arvind Sankar
2020-11-10 22:15               ` Arvind Sankar
2020-11-10 22:36               ` Nick Desaulniers
2020-11-10 22:36                 ` Nick Desaulniers
2020-11-10 22:39                 ` Nick Desaulniers
2020-11-10 22:39                   ` Nick Desaulniers
2020-11-10 22:39                   ` Nick Desaulniers
2020-11-10 22:39                     ` Nick Desaulniers
2020-11-10 22:54                     ` Arvind Sankar
2020-11-10 22:54                       ` Arvind Sankar
2020-11-10 23:56             ` Adrian Ratiu
2020-11-10 23:56               ` Adrian Ratiu
2020-11-11  0:18               ` Nick Desaulniers
2020-11-11  0:18                 ` Nick Desaulniers
2020-11-11 14:15                 ` Adrian Ratiu
2020-11-11 14:15                   ` Adrian Ratiu
2020-11-12 21:50                   ` Arvind Sankar
2020-11-12 21:50                     ` Arvind Sankar
2020-11-12 21:55                     ` Nick Desaulniers
2020-11-12 21:55                       ` Nick Desaulniers
2020-11-07 10:22   ` Russell King - ARM Linux admin
2020-11-07 10:22     ` Russell King - ARM Linux admin
2020-11-07 18:12     ` Adrian Ratiu
2020-11-07 18:12       ` Adrian Ratiu
2020-11-08 17:40   ` Arvind Sankar
2020-11-08 17:40     ` Arvind Sankar
2020-11-08 18:09     ` Arvind Sankar
2020-11-08 18:09       ` Arvind Sankar
2020-11-08 20:14       ` Ard Biesheuvel
2020-11-08 20:14         ` Ard Biesheuvel

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