[dpdk-dev] [PATCH v2] acl: fix build issue with some arm64 compiler

[<jerinj@marvell.com>]

From: Jerin Jacob <jerinj@marvell.com>

Some compilers reporting the following error, though the existing
code doesn't have any uninitialized variable case.
Just to make compiler happy, initialize the int32x4_t variable
one shot using vdupq_n_s32.

../lib/librte_acl/acl_run_neon.h: In function 'search_neon_4'
../lib/librte_acl/acl_run_neon.h:230:12: error: 'input' may be
used uninitialized in this function [-Werror=maybe-uninitialized]
  int32x4_t input;

Fixes: 34fa6c27c156 ("acl: add NEON optimization for ARMv8")
Cc: stable@dpdk.org

Suggested-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Signed-off-by: Jerin Jacob <jerinj@marvell.com>
---

v2:
- Changed C based initializion to vdupq_n_s32 for better comparability with
  ACLE(Honnappa)

---
 lib/librte_acl/acl_run_neon.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/librte_acl/acl_run_neon.h b/lib/librte_acl/acl_run_neon.h
index 01b9766d8..b3196cd12 100644
--- a/lib/librte_acl/acl_run_neon.h
+++ b/lib/librte_acl/acl_run_neon.h
@@ -181,8 +181,8 @@ search_neon_8(const struct rte_acl_ctx *ctx, const uint8_t **data,
 
 	while (flows.started > 0) {
 		/* Gather 4 bytes of input data for each stream. */
-		input0 = vsetq_lane_s32(GET_NEXT_4BYTES(parms, 0), input0, 0);
-		input1 = vsetq_lane_s32(GET_NEXT_4BYTES(parms, 4), input1, 0);
+		input0 = vdupq_n_s32(GET_NEXT_4BYTES(parms, 0));
+		input1 = vdupq_n_s32(GET_NEXT_4BYTES(parms, 4));
 
 		input0 = vsetq_lane_s32(GET_NEXT_4BYTES(parms, 1), input0, 1);
 		input1 = vsetq_lane_s32(GET_NEXT_4BYTES(parms, 5), input1, 1);
@@ -242,7 +242,7 @@ search_neon_4(const struct rte_acl_ctx *ctx, const uint8_t **data,
 
 	while (flows.started > 0) {
 		/* Gather 4 bytes of input data for each stream. */
-		input = vsetq_lane_s32(GET_NEXT_4BYTES(parms, 0), input, 0);
+		input = vdupq_n_s32(GET_NEXT_4BYTES(parms, 0));
 		input = vsetq_lane_s32(GET_NEXT_4BYTES(parms, 1), input, 1);
 		input = vsetq_lane_s32(GET_NEXT_4BYTES(parms, 2), input, 2);
 		input = vsetq_lane_s32(GET_NEXT_4BYTES(parms, 3), input, 3);
-- 
2.21.0