[dpdk-dev] [PATCH v8 1/3] eal: introduce integer divide through reciprocal
Pavan Nikhilesh
pbhagavatula at caviumnetworks.com
Fri Jan 26 06:04:49 CET 2018
In some use cases of integer division, denominator remains constant and
numerator varies. It is possible to optimize division for such specific
scenarios.
The librte_sched uses rte_reciprocal to optimize division so, moving it to
eal/common would allow other libraries and applications to use it.
Signed-off-by: Pavan Nikhilesh <pbhagavatula at caviumnetworks.com>
---
v8 Changes:
- add SPDX license tags.
v7 changes:
- reworked u64 division (follows same flow as 32bit).
- addressed review comments from v6 (Undo cosmetic changes to 32bit division)
v6 changes:
- remove cache alignment from rte_reciprocal_u{32/64}structures as they would
be embedded in other structures.
v5 changes:
- fix test print strings
v4 changes:
- minor fix for test cases
- fix u32 divisor generation
v3 changes:
- fix x86_32 compilation issue
- fix improper licence in test
v2 changes:
- fix compilation issues with .map files
- add test cases for correctness and performance
- remove extra licence inclusion
- fix coding style issues
lib/librte_eal/bsdapp/eal/Makefile | 1 +
lib/librte_eal/common/Makefile | 1 +
lib/{librte_sched => librte_eal/common/include}/rte_reciprocal.h | 0
lib/{librte_sched => librte_eal/common}/rte_reciprocal.c | 0
lib/librte_eal/linuxapp/eal/Makefile | 1 +
lib/librte_eal/rte_eal_version.map | 2 +-
lib/librte_sched/Makefile | 2 --
lib/librte_sched/rte_sched.c | 2 +-
8 files changed, 5 insertions(+), 4 deletions(-)
rename lib/{librte_sched => librte_eal/common/include}/rte_reciprocal.h (100%)
rename lib/{librte_sched => librte_eal/common}/rte_reciprocal.c (100%)
diff --git a/lib/librte_eal/bsdapp/eal/Makefile b/lib/librte_eal/bsdapp/eal/Makefile
index c6940760f..028e81dd8 100644
--- a/lib/librte_eal/bsdapp/eal/Makefile
+++ b/lib/librte_eal/bsdapp/eal/Makefile
@@ -57,6 +57,7 @@ SRCS-$(CONFIG_RTE_EXEC_ENV_BSDAPP) += malloc_elem.c
SRCS-$(CONFIG_RTE_EXEC_ENV_BSDAPP) += malloc_heap.c
SRCS-$(CONFIG_RTE_EXEC_ENV_BSDAPP) += rte_keepalive.c
SRCS-$(CONFIG_RTE_EXEC_ENV_BSDAPP) += rte_service.c
+SRCS-$(CONFIG_RTE_EXEC_ENV_BSDAPP) += rte_reciprocal.c
# from arch dir
SRCS-$(CONFIG_RTE_EXEC_ENV_BSDAPP) += rte_cpuflags.c
diff --git a/lib/librte_eal/common/Makefile b/lib/librte_eal/common/Makefile
index 96904dea1..ea824a3a8 100644
--- a/lib/librte_eal/common/Makefile
+++ b/lib/librte_eal/common/Makefile
@@ -16,6 +16,7 @@ INC += rte_pci_dev_feature_defs.h rte_pci_dev_features.h
INC += rte_malloc.h rte_keepalive.h rte_time.h
INC += rte_service.h rte_service_component.h
INC += rte_bitmap.h rte_vfio.h rte_hypervisor.h rte_test.h
+INC += rte_reciprocal.h
GENERIC_INC := rte_atomic.h rte_byteorder.h rte_cycles.h rte_prefetch.h
GENERIC_INC += rte_spinlock.h rte_memcpy.h rte_cpuflags.h rte_rwlock.h
diff --git a/lib/librte_sched/rte_reciprocal.h b/lib/librte_eal/common/include/rte_reciprocal.h
similarity index 100%
rename from lib/librte_sched/rte_reciprocal.h
rename to lib/librte_eal/common/include/rte_reciprocal.h
diff --git a/lib/librte_sched/rte_reciprocal.c b/lib/librte_eal/common/rte_reciprocal.c
similarity index 100%
rename from lib/librte_sched/rte_reciprocal.c
rename to lib/librte_eal/common/rte_reciprocal.c
diff --git a/lib/librte_eal/linuxapp/eal/Makefile b/lib/librte_eal/linuxapp/eal/Makefile
index 7bf278f3b..e50b73a69 100644
--- a/lib/librte_eal/linuxapp/eal/Makefile
+++ b/lib/librte_eal/linuxapp/eal/Makefile
@@ -64,6 +64,7 @@ SRCS-$(CONFIG_RTE_EXEC_ENV_LINUXAPP) += malloc_elem.c
SRCS-$(CONFIG_RTE_EXEC_ENV_LINUXAPP) += malloc_heap.c
SRCS-$(CONFIG_RTE_EXEC_ENV_LINUXAPP) += rte_keepalive.c
SRCS-$(CONFIG_RTE_EXEC_ENV_LINUXAPP) += rte_service.c
+SRCS-$(CONFIG_RTE_EXEC_ENV_LINUXAPP) += rte_reciprocal.c
# from arch dir
SRCS-$(CONFIG_RTE_EXEC_ENV_LINUXAPP) += rte_cpuflags.c
diff --git a/lib/librte_eal/rte_eal_version.map b/lib/librte_eal/rte_eal_version.map
index 7088b7230..730966407 100644
--- a/lib/librte_eal/rte_eal_version.map
+++ b/lib/librte_eal/rte_eal_version.map
@@ -206,7 +206,7 @@ DPDK_18.02 {
rte_hypervisor_get;
rte_hypervisor_get_name;
rte_vfio_clear_group;
-
+ rte_reciprocal_value;
} DPDK_17.11;
EXPERIMENTAL {
diff --git a/lib/librte_sched/Makefile b/lib/librte_sched/Makefile
index 73c9d1a37..55d9c6989 100644
--- a/lib/librte_sched/Makefile
+++ b/lib/librte_sched/Makefile
@@ -26,10 +26,8 @@ LIBABIVER := 1
# all source are stored in SRCS-y
#
SRCS-$(CONFIG_RTE_LIBRTE_SCHED) += rte_sched.c rte_red.c rte_approx.c
-SRCS-$(CONFIG_RTE_LIBRTE_SCHED) += rte_reciprocal.c
# install includes
SYMLINK-$(CONFIG_RTE_LIBRTE_SCHED)-include := rte_sched.h rte_sched_common.h rte_red.h rte_approx.h
-SYMLINK-$(CONFIG_RTE_LIBRTE_SCHED)-include += rte_reciprocal.h
include $(RTE_SDK)/mk/rte.lib.mk
diff --git a/lib/librte_sched/rte_sched.c b/lib/librte_sched/rte_sched.c
index ad2f7c6d5..634486c80 100644
--- a/lib/librte_sched/rte_sched.c
+++ b/lib/librte_sched/rte_sched.c
@@ -14,11 +14,11 @@
#include <rte_branch_prediction.h>
#include <rte_mbuf.h>
#include <rte_bitmap.h>
+#include <rte_reciprocal.h>
#include "rte_sched.h"
#include "rte_sched_common.h"
#include "rte_approx.h"
-#include "rte_reciprocal.h"
#ifdef __INTEL_COMPILER
#pragma warning(disable:2259) /* conversion may lose significant bits */
--
2.14.1
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