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Date: Sun, 7 Oct 2012 17:09:02 +0200
From: "Markus F.X.J. Oberhumer" <markus@...rhumer.com>
To: linux-kernel@...r.kernel.org
Cc: "Markus F.X.J. Oberhumer" <markus@...rhumer.com>,
Andi Kleen <andi@...stfloor.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Johannes Stezenbach <js@...21.net>,
richard -rw- weinberger <richard.weinberger@...il.com>
Subject: [PATCH 3/3] lib/lzo: Optimize code for CPUs with inefficient
unaligned access
Some code paths are only benefical on machines with fast unaligned
loads, so only use these if CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
defined.
Signed-off-by: Markus F.X.J. Oberhumer <markus@...rhumer.com>
---
lib/lzo/lzo1x_compress.c | 4 ++--
lib/lzo/lzo1x_decompress_safe.c | 15 ++++++++++++---
lib/lzo/lzodefs.h | 2 +-
3 files changed, 15 insertions(+), 6 deletions(-)
diff --git a/lib/lzo/lzo1x_compress.c b/lib/lzo/lzo1x_compress.c
index d42efe5..1593dba 100644
--- a/lib/lzo/lzo1x_compress.c
+++ b/lib/lzo/lzo1x_compress.c
@@ -90,7 +90,7 @@ next:
m_len = 4;
{
-#if defined(LZO_USE_CTZ64)
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && defined(LZO_USE_CTZ64)
u64 v;
v = get_unaligned((const u64 *) (ip + m_len)) ^
get_unaligned((const u64 *) (m_pos + m_len));
@@ -110,7 +110,7 @@ next:
# else
# error "missing endian definition"
# endif
-#elif defined(LZO_USE_CTZ32)
+#elif defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && defined(LZO_USE_CTZ32)
u32 v;
v = get_unaligned((const u32 *) (ip + m_len)) ^
get_unaligned((const u32 *) (m_pos + m_len));
diff --git a/lib/lzo/lzo1x_decompress_safe.c b/lib/lzo/lzo1x_decompress_safe.c
index 0dba30c..569985d 100644
--- a/lib/lzo/lzo1x_decompress_safe.c
+++ b/lib/lzo/lzo1x_decompress_safe.c
@@ -64,6 +64,7 @@ int lzo1x_decompress_safe(const unsigned char *in, size_t in_len,
}
t += 3;
copy_literal_run:
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
if (likely(HAVE_IP(t + 15) && HAVE_OP(t + 15))) {
const unsigned char *ie = ip + t;
unsigned char *oe = op + t;
@@ -77,7 +78,9 @@ copy_literal_run:
} while (ip < ie);
ip = ie;
op = oe;
- } else {
+ } else
+#endif
+ {
NEED_OP(t);
NEED_IP(t + 3);
do {
@@ -148,6 +151,7 @@ copy_literal_run:
m_pos -= 0x4000;
}
TEST_LB(m_pos);
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
if (op - m_pos >= 8) {
unsigned char *oe = op + t;
if (likely(HAVE_OP(t + 15))) {
@@ -173,7 +177,9 @@ copy_literal_run:
*op++ = *m_pos++;
} while (op < oe);
}
- } else {
+ } else
+#endif
+ {
unsigned char *oe = op + t;
NEED_OP(t);
op[0] = m_pos[0];
@@ -187,11 +193,14 @@ copy_literal_run:
match_next:
state = next;
t = next;
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
if (likely(HAVE_IP(6) && HAVE_OP(4))) {
COPY4(op, ip);
op += t;
ip += t;
- } else {
+ } else
+#endif
+ {
NEED_IP(t + 3);
NEED_OP(t);
while (t > 0) {
diff --git a/lib/lzo/lzodefs.h b/lib/lzo/lzodefs.h
index ddc8db5..5a4beb2 100644
--- a/lib/lzo/lzodefs.h
+++ b/lib/lzo/lzodefs.h
@@ -29,7 +29,7 @@
#define LZO_USE_CTZ32 1
#elif defined(__i386__) || defined(__powerpc__)
#define LZO_USE_CTZ32 1
-#else
+#elif defined(__arm__) && (__LINUX_ARM_ARCH__ >= 5)
#define LZO_USE_CTZ32 1
#endif
--
1.7.1
--
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