[dpdk-dev] [PATCH v3 2/6] hash: compile armv8a CRC32 support conditionally

[Ashwin Sekhar T K]

Compile the armv8a CRC32 support only if the machine
has the CRC extensions i.e if RTE_MACHINE_CPUFLAG_CRC32
is defined.

Removed the .arch assembly directives as these are no
more necessary.

Signed-off-by: Ashwin Sekhar T K <ashwin.sekhar at caviumnetworks.com>
Reviewed-by: Jerin Jacob <jerin.jacob at caviumnetworks.com>
---
 lib/librte_hash/Makefile        | 2 ++
 lib/librte_hash/rte_crc_arm64.h | 4 ----
 lib/librte_hash/rte_hash_crc.h  | 2 +-
 3 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/lib/librte_hash/Makefile b/lib/librte_hash/Makefile
index d856aa26d..9cf13a045 100644
--- a/lib/librte_hash/Makefile
+++ b/lib/librte_hash/Makefile
@@ -49,8 +49,10 @@ SRCS-$(CONFIG_RTE_LIBRTE_HASH) += rte_fbk_hash.c
 SYMLINK-$(CONFIG_RTE_LIBRTE_HASH)-include := rte_hash.h
 SYMLINK-$(CONFIG_RTE_LIBRTE_HASH)-include += rte_hash_crc.h
 ifeq ($(CONFIG_RTE_ARCH_ARM64),y)
+ifneq ($(findstring RTE_MACHINE_CPUFLAG_CRC32,$(CFLAGS)),)
 SYMLINK-$(CONFIG_RTE_LIBRTE_HASH)-include += rte_crc_arm64.h
 endif
+endif
 SYMLINK-$(CONFIG_RTE_LIBRTE_HASH)-include += rte_jhash.h
 SYMLINK-$(CONFIG_RTE_LIBRTE_HASH)-include += rte_thash.h
 SYMLINK-$(CONFIG_RTE_LIBRTE_HASH)-include += rte_fbk_hash.h
diff --git a/lib/librte_hash/rte_crc_arm64.h b/lib/librte_hash/rte_crc_arm64.h
index 7dd6334ee..91cde3b9d 100644
--- a/lib/librte_hash/rte_crc_arm64.h
+++ b/lib/librte_hash/rte_crc_arm64.h
@@ -52,7 +52,6 @@ extern "C" {
 static inline uint32_t
 crc32c_arm64_u8(uint8_t data, uint32_t init_val)
 {
-	asm(".arch armv8-a+crc");
 	__asm__ volatile(
 			"crc32cb %w[crc], %w[crc], %w[value]"
 			: [crc] "+r" (init_val)
@@ -63,7 +62,6 @@ crc32c_arm64_u8(uint8_t data, uint32_t init_val)
 static inline uint32_t
 crc32c_arm64_u16(uint16_t data, uint32_t init_val)
 {
-	asm(".arch armv8-a+crc");
 	__asm__ volatile(
 			"crc32ch %w[crc], %w[crc], %w[value]"
 			: [crc] "+r" (init_val)
@@ -74,7 +72,6 @@ crc32c_arm64_u16(uint16_t data, uint32_t init_val)
 static inline uint32_t
 crc32c_arm64_u32(uint32_t data, uint32_t init_val)
 {
-	asm(".arch armv8-a+crc");
 	__asm__ volatile(
 			"crc32cw %w[crc], %w[crc], %w[value]"
 			: [crc] "+r" (init_val)
@@ -85,7 +82,6 @@ crc32c_arm64_u32(uint32_t data, uint32_t init_val)
 static inline uint32_t
 crc32c_arm64_u64(uint64_t data, uint32_t init_val)
 {
-	asm(".arch armv8-a+crc");
 	__asm__ volatile(
 			"crc32cx %w[crc], %w[crc], %x[value]"
 			: [crc] "+r" (init_val)
diff --git a/lib/librte_hash/rte_hash_crc.h b/lib/librte_hash/rte_hash_crc.h
index 0f485b854..808a082c5 100644
--- a/lib/librte_hash/rte_hash_crc.h
+++ b/lib/librte_hash/rte_hash_crc.h
@@ -453,7 +453,7 @@ crc32c_sse42_u64(uint64_t data, uint64_t init_val)
 
 static uint8_t crc32_alg = CRC32_SW;
 
-#if defined(RTE_ARCH_ARM64)
+#if defined(RTE_ARCH_ARM64) && defined(RTE_MACHINE_CPUFLAG_CRC32)
 #include "rte_crc_arm64.h"
 #else
 
-- 
2.12.2