[dpdk-dev] [PATCH] acl: fix build with GCC 6.3

[Konstantin Ananyev <konstantin.ananyev@intel.com>]

--buildtype=debug with gcc 6.3 produces the following error:

../lib/librte_acl/acl_run_avx512_common.h: In function
‘resolve_match_idx_avx512x16’:
../lib/librte_acl/acl_run_avx512x16.h:33:18: error:
	the last argument must be an 8-bit immediate
                               ^
../lib/librte_acl/acl_run_avx512_common.h:373:9: note:
	in expansion of macro ‘_M_I_’
      return _M_I_(slli_epi32)(mi, match_log);
             ^~~~~

Seems like gcc-6.3 complains about the following construct:

static const uint32_t match_log = 5;
    ...
_mm512_slli_epi32(mi, match_log);

It can't substitute constant variable 'match_log' with its actual value.
The fix replaces constant variable with its immediate value.

Bugzilla ID: 717
Fixes: b64c2295f7fc ("acl: add 256-bit AVX512 classify method")
Fixes: 45da22e42ec3 ("acl: add 512-bit AVX512 classify method")
Cc: stable@dpdk.org

Reported-by: Liang Ma <liangma@liangbit.com>
Signed-off-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
---
 lib/acl/acl_run_avx512.c        | 8 ++++----
 lib/acl/acl_run_avx512_common.h | 4 ++--
 lib/acl/acl_run_avx512x16.h     | 6 ++----
 3 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/lib/acl/acl_run_avx512.c b/lib/acl/acl_run_avx512.c
index 3fd1e33c3..78fbe34f7 100644
--- a/lib/acl/acl_run_avx512.c
+++ b/lib/acl/acl_run_avx512.c
@@ -4,8 +4,8 @@
 
 #include "acl_run_sse.h"
 
-/*sizeof(uint32_t) << match_log == sizeof(struct rte_acl_match_results)*/
-static const uint32_t match_log = 5;
+/*sizeof(uint32_t) << ACL_MATCH_LOG == sizeof(struct rte_acl_match_results)*/
+#define ACL_MATCH_LOG	5
 
 struct acl_flow_avx512 {
 	uint32_t num_packets;       /* number of packets processed */
@@ -82,7 +82,7 @@ resolve_mcle8_avx512x1(uint32_t result[],
 
 	for (k = 0; k != nb_pkt; k++, result += nb_cat) {
 
-		mi = match[k] << match_log;
+		mi = match[k] << ACL_MATCH_LOG;
 
 		for (j = 0; j != nb_cat; j += RTE_ACL_RESULTS_MULTIPLIER) {
 
@@ -92,7 +92,7 @@ resolve_mcle8_avx512x1(uint32_t result[],
 			for (i = 1, pm = match + nb_pkt; i != nb_trie;
 				i++, pm += nb_pkt) {
 
-				mn = j + (pm[k] << match_log);
+				mn = j + (pm[k] << ACL_MATCH_LOG);
 
 				nr = _mm_loadu_si128((const xmm_t *)(res + mn));
 				np = _mm_loadu_si128((const xmm_t *)(pri + mn));
diff --git a/lib/acl/acl_run_avx512_common.h b/lib/acl/acl_run_avx512_common.h
index fbad74d45..578eaa1d0 100644
--- a/lib/acl/acl_run_avx512_common.h
+++ b/lib/acl/acl_run_avx512_common.h
@@ -393,8 +393,8 @@ static inline _T_simd
 _F_(resolve_match_idx)(_T_simd mi)
 {
 	RTE_BUILD_BUG_ON(sizeof(struct rte_acl_match_results) !=
-		1 << (match_log + 2));
-	return _M_I_(slli_epi32)(mi, match_log);
+		1 << (ACL_MATCH_LOG + 2));
+	return _M_I_(slli_epi32)(mi, ACL_MATCH_LOG);
 }
 
 /*
diff --git a/lib/acl/acl_run_avx512x16.h b/lib/acl/acl_run_avx512x16.h
index da244bc25..48bb6fed8 100644
--- a/lib/acl/acl_run_avx512x16.h
+++ b/lib/acl/acl_run_avx512x16.h
@@ -252,8 +252,6 @@ resolve_mcgt8_avx512x1(uint32_t result[],
 	__mmask16 cm, sm;
 	__m512i cp, cr, np, nr;
 
-	const uint32_t match_log = 5;
-
 	res = pr->results;
 	pri = pr->priority;
 
@@ -261,7 +259,7 @@ resolve_mcgt8_avx512x1(uint32_t result[],
 
 	for (k = 0; k != nb_pkt; k++, result += nb_cat) {
 
-		mi = match[k] << match_log;
+		mi = match[k] << ACL_MATCH_LOG;
 
 		cr = _mm512_maskz_loadu_epi32(cm, res + mi);
 		cp = _mm512_maskz_loadu_epi32(cm, pri + mi);
@@ -269,7 +267,7 @@ resolve_mcgt8_avx512x1(uint32_t result[],
 		for (i = 1, pm = match + nb_pkt; i != nb_trie;
 				i++, pm += nb_pkt) {
 
-			mi = pm[k] << match_log;
+			mi = pm[k] << ACL_MATCH_LOG;
 
 			nr = _mm512_maskz_loadu_epi32(cm, res + mi);
 			np = _mm512_maskz_loadu_epi32(cm, pri + mi);
-- 
2.25.1