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Date: Mon, 19 Sep 2022 14:05:58 -0700
From: Yury Norov <yury.norov@...il.com>
To: linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
"David S . Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Rasmus Villemoes <linux@...musvillemoes.dk>,
Yury Norov <yury.norov@...il.com>
Subject: [PATCH 6/7] lib/find: optimize for_each() macros
Moving an iterator of the macros inside conditional part of for-loop
helps to generate a better code. It had been first implemented in commit
7baac8b91f9871ba ("cpumask: make for_each_cpu_mask a bit smaller").
Now that cpumask for-loops are the aliases to bitmap loops, it's worth
to optimize them the same way.
Bloat-o-meter says:
add/remove: 8/12 grow/shrink: 147/592 up/down: 4876/-24416 (-19540)
Signed-off-by: Yury Norov <yury.norov@...il.com>
---
include/linux/find.h | 56 ++++++++++++++++++++------------------------
1 file changed, 25 insertions(+), 31 deletions(-)
diff --git a/include/linux/find.h b/include/linux/find.h
index 3b746a183216..0cdfab9734a6 100644
--- a/include/linux/find.h
+++ b/include/linux/find.h
@@ -458,31 +458,25 @@ unsigned long find_next_bit_le(const void *addr, unsigned
#endif
#define for_each_set_bit(bit, addr, size) \
- for ((bit) = find_next_bit((addr), (size), 0); \
- (bit) < (size); \
- (bit) = find_next_bit((addr), (size), (bit) + 1))
+ for ((bit) = 0; (bit) = find_next_bit((addr), (size), (bit)), (bit) < (size); (bit)++)
#define for_each_and_bit(bit, addr1, addr2, size) \
- for ((bit) = find_next_and_bit((addr1), (addr2), (size), 0); \
- (bit) < (size); \
- (bit) = find_next_and_bit((addr1), (addr2), (size), (bit) + 1))
+ for ((bit) = 0; \
+ (bit) = find_next_and_bit((addr1), (addr2), (size), (bit)), (bit) < (size);\
+ (bit)++)
/* same as for_each_set_bit() but use bit as value to start with */
#define for_each_set_bit_from(bit, addr, size) \
- for ((bit) = find_next_bit((addr), (size), (bit)); \
- (bit) < (size); \
- (bit) = find_next_bit((addr), (size), (bit) + 1))
+ for (; (bit) = find_next_bit((addr), (size), (bit)), (bit) < (size); (bit)++)
#define for_each_clear_bit(bit, addr, size) \
- for ((bit) = find_next_zero_bit((addr), (size), 0); \
- (bit) < (size); \
- (bit) = find_next_zero_bit((addr), (size), (bit) + 1))
+ for ((bit) = 0; \
+ (bit) = find_next_zero_bit((addr), (size), (bit)), (bit) < (size); \
+ (bit)++)
/* same as for_each_clear_bit() but use bit as value to start with */
#define for_each_clear_bit_from(bit, addr, size) \
- for ((bit) = find_next_zero_bit((addr), (size), (bit)); \
- (bit) < (size); \
- (bit) = find_next_zero_bit((addr), (size), (bit) + 1))
+ for (; (bit) = find_next_zero_bit((addr), (size), (bit)), (bit) < (size); (bit)++)
/**
* for_each_set_bitrange - iterate over all set bit ranges [b; e)
@@ -492,11 +486,11 @@ unsigned long find_next_bit_le(const void *addr, unsigned
* @size: bitmap size in number of bits
*/
#define for_each_set_bitrange(b, e, addr, size) \
- for ((b) = find_next_bit((addr), (size), 0), \
- (e) = find_next_zero_bit((addr), (size), (b) + 1); \
+ for ((b) = 0; \
+ (b) = find_next_bit((addr), (size), b), \
+ (e) = find_next_zero_bit((addr), (size), (b) + 1), \
(b) < (size); \
- (b) = find_next_bit((addr), (size), (e) + 1), \
- (e) = find_next_zero_bit((addr), (size), (b) + 1))
+ (b) = (e) + 1)
/**
* for_each_set_bitrange_from - iterate over all set bit ranges [b; e)
@@ -506,11 +500,11 @@ unsigned long find_next_bit_le(const void *addr, unsigned
* @size: bitmap size in number of bits
*/
#define for_each_set_bitrange_from(b, e, addr, size) \
- for ((b) = find_next_bit((addr), (size), (b)), \
- (e) = find_next_zero_bit((addr), (size), (b) + 1); \
+ for (; \
+ (b) = find_next_bit((addr), (size), (b)), \
+ (e) = find_next_zero_bit((addr), (size), (b) + 1), \
(b) < (size); \
- (b) = find_next_bit((addr), (size), (e) + 1), \
- (e) = find_next_zero_bit((addr), (size), (b) + 1))
+ (b) = (e) + 1)
/**
* for_each_clear_bitrange - iterate over all unset bit ranges [b; e)
@@ -520,11 +514,11 @@ unsigned long find_next_bit_le(const void *addr, unsigned
* @size: bitmap size in number of bits
*/
#define for_each_clear_bitrange(b, e, addr, size) \
- for ((b) = find_next_zero_bit((addr), (size), 0), \
- (e) = find_next_bit((addr), (size), (b) + 1); \
+ for ((b) = 0; \
+ (b) = find_next_zero_bit((addr), (size), (b)), \
+ (e) = find_next_bit((addr), (size), (b) + 1), \
(b) < (size); \
- (b) = find_next_zero_bit((addr), (size), (e) + 1), \
- (e) = find_next_bit((addr), (size), (b) + 1))
+ (b) = (e) + 1)
/**
* for_each_clear_bitrange_from - iterate over all unset bit ranges [b; e)
@@ -534,11 +528,11 @@ unsigned long find_next_bit_le(const void *addr, unsigned
* @size: bitmap size in number of bits
*/
#define for_each_clear_bitrange_from(b, e, addr, size) \
- for ((b) = find_next_zero_bit((addr), (size), (b)), \
- (e) = find_next_bit((addr), (size), (b) + 1); \
+ for (; \
+ (b) = find_next_zero_bit((addr), (size), (b)), \
+ (e) = find_next_bit((addr), (size), (b) + 1), \
(b) < (size); \
- (b) = find_next_zero_bit((addr), (size), (e) + 1), \
- (e) = find_next_bit((addr), (size), (b) + 1))
+ (b) = (e) + 1)
/**
* for_each_set_bit_wrap - iterate over all set bits starting from @start, and
--
2.34.1
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