From: Mike Sowka <msowka@gmail.com>
Date: Sat, 5 Dec 2015 22:27:56 +0000 (-0500)
Subject: sched: fix build without SSE4
X-Git-Tag: spdx-start~7904
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=90f455f3d337273ccaf122463982de157ada6ff6;p=dpdk.git

sched: fix build without SSE4

Irrelevant of the target, the preprocessor #ifdef SSE2 for the
grinder_pipe_exists function is inadequate since the __mm_testz_si128
function requires SSE4.1, PTEST instruction described in
https://en.wikipedia.org/wiki/SSE4#SSE4.1 (I do no have better spec
reference). I have bumped the preprocessor #ifdef to require SSE4.

The Atom N2600 does not have SSE4, http://ark.intel.com/products/58916,
and so I had trouble building rte_sched with optimized version of
grinder_pipe_exists, with following:
error: inlining failed in call to always_inline _mm_testz_si128’:
       target specific option mismatch

GCC 4.9 correctly identifies my target as not having SSE4, and with
provided patch builds the non-optimized version of grinder_pipe_exists.

Signed-off-by: Mike Sowka <msowka@gmail.com>
---

diff --git a/lib/librte_sched/rte_sched.c b/lib/librte_sched/rte_sched.c
index 21ebf25338..6f92aa6cc1 100644
--- a/lib/librte_sched/rte_sched.c
+++ b/lib/librte_sched/rte_sched.c
@@ -55,8 +55,8 @@
 #ifdef RTE_SCHED_VECTOR
 #include <rte_vect.h>
 
-#if defined(__SSE2__)
-#define SCHED_VECTOR_SSE2
+#if defined(__SSE4__)
+#define SCHED_VECTOR_SSE4
 #endif
 
 #endif
@@ -1672,7 +1672,7 @@ grinder_schedule(struct rte_sched_port *port, uint32_t pos)
 	return 1;
 }
 
-#ifdef SCHED_VECTOR_SSE2
+#ifdef SCHED_VECTOR_SSE4
 
 static inline int
 grinder_pipe_exists(struct rte_sched_port *port, uint32_t base_pipe)