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From: "H. Peter Anvin" <hpa@zytor.com>
To: Sam Ravnborg <sam@ravnborg.org>,
	linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org,
	linux-arch@vger.kernel.org
Cc: Andy Lutomirski <luto@amacapital.net>,
	Andrew Morton <akpm@linux-foundation.org>,
	Ingo Molnar <mingo@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	"H. Peter Anvin" <hpa@zytor.com>
Subject: [PATCH RFC 09/10] tools: Add common infrastructure for byte swapping
Date: Tue, 10 Jun 2014 16:13:13 -0700	[thread overview]
Message-ID: <1402441994-16780-10-git-send-email-hpa@zytor.com> (raw)
In-Reply-To: <1402441994-16780-1-git-send-email-hpa@zytor.com>

Common selection infrastructure for picking the best byte swap method.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
---
 tools/include/tools/unaligned/be_swap.h | 15 +++++++++++++++
 tools/include/tools/unaligned/le_swap.h | 15 +++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100644 tools/include/tools/unaligned/be_swap.h
 create mode 100644 tools/include/tools/unaligned/le_swap.h

diff --git a/tools/include/tools/unaligned/be_swap.h b/tools/include/tools/unaligned/be_swap.h
new file mode 100644
index 000000000000..f0effb8fc6ca
--- /dev/null
+++ b/tools/include/tools/unaligned/be_swap.h
@@ -0,0 +1,15 @@
+#ifndef TOOLS_BE_SWAP_H
+#define TOOLS_BE_SWAP_H
+
+#ifdef htole64
+/* Prefer the <endian.h> infrastructure if it exists */
+# include <tools/unaligned/be_endian.h>
+#elif TOOLS_UNALIGNED_GCC >= 0x040800
+/* This version of gcc is new enough to have __builtin_bswap*() */
+# include <tools/unaligned/be_bswap.h>
+#else
+/* This always works */
+# include <tools/unaligned/be_byteshift.h>
+#endif
+
+#endif /* TOOLS_BE_SWAP_H */
diff --git a/tools/include/tools/unaligned/le_swap.h b/tools/include/tools/unaligned/le_swap.h
new file mode 100644
index 000000000000..8952723c1dff
--- /dev/null
+++ b/tools/include/tools/unaligned/le_swap.h
@@ -0,0 +1,15 @@
+#ifndef TOOLS_LE_SWAP_H
+#define TOOLS_LE_SWAP_H
+
+#ifdef htobe64
+/* Prefer the <endian.h> infrastructure if it exists */
+# include <tools/unaligned/le_endian.h>
+#elif TOOLS_UNALIGNED_GCC >= 0x040800
+/* This version of gcc is new enough to have __builtin_bswap*() */
+# include <tools/unaligned/le_bswap.h>
+#else
+/* This always works */
+# include <tools/unaligned/le_byteshift.h>
+#endif
+
+#endif /* TOOLS_LE_SWAP_H */
-- 
1.9.3


  parent reply	other threads:[~2014-06-10 23:14 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-06-10 23:13 [PATCH RFC 00/10] tools: Revamp the unaligned endian access functions H. Peter Anvin
2014-06-10 23:13 ` [PATCH RFC 01/10] tools: Remove double-underscore symbols from user space byteshift functions H. Peter Anvin
2014-06-10 23:13 ` [PATCH RFC 02/10] tools: Create <tools/unaligned.h> and an unaligned subdirectory H. Peter Anvin
2014-06-10 23:13 ` [PATCH RFC 03/10] tools: Add le_direct/be_direct methods for unaligned access H. Peter Anvin
2014-06-10 23:25   ` Andy Lutomirski
2014-06-10 23:30     ` H. Peter Anvin
2014-06-10 23:33       ` Andy Lutomirski
2014-06-10 23:41         ` H. Peter Anvin
2014-06-10 23:13 ` [PATCH RFC 04/10] tools: Add packed struct method for unaligned references H. Peter Anvin
2014-06-10 23:13 ` [PATCH RFC 05/10] tools: Add <endian.h> libc support " H. Peter Anvin
2014-06-10 23:13 ` [PATCH RFC 06/10] tools: Add gcc __builtin_bswap*() " H. Peter Anvin
2014-06-10 23:13 ` [PATCH RFC 07/10] tools: Remove leading underscores from header guards H. Peter Anvin
2014-06-10 23:13 ` [PATCH RFC 08/10] tools: Move unaligned common infrastructure into <tools/unaligned.h> H. Peter Anvin
2014-06-10 23:13 ` H. Peter Anvin [this message]
2014-06-10 23:13 ` [PATCH RFC 10/10] tools: Use reasonable defaults for the default access H. Peter Anvin
2014-06-11 19:21 ` [PATCH RFC 00/10] tools: Revamp the unaligned endian access functions Sam Ravnborg
2014-06-11 21:52   ` H. Peter Anvin
2014-06-13 20:04     ` Sam Ravnborg

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