Add macro for unifying Clang/ICC/GCC unroll pragma format. Burst
functions were contained of several small loops which optimized by
compiler’s loop unrolling pragma.
Signed-off-by: Marvin Liu <yong....@intel.com>
diff --git a/lib/librte_vhost/Makefile b/lib/librte_vhost/Makefile
index 8623e91c0..30839a001 100644
--- a/lib/librte_vhost/Makefile
+++ b/lib/librte_vhost/Makefile
@@ -16,6 +16,24 @@ CFLAGS += -I vhost_user
CFLAGS += -fno-strict-aliasing
LDLIBS += -lpthread
+ifeq ($(RTE_TOOLCHAIN), gcc)
+ifeq ($(shell test $(GCC_VERSION) -ge 83 && echo 1), 1)
+CFLAGS += -DSUPPORT_GCC_UNROLL_PRAGMA
+endif
+endif
+
+ifeq ($(RTE_TOOLCHAIN), clang)
+ifeq ($(shell test $(CLANG_MAJOR_VERSION)$(CLANG_MINOR_VERSION) -ge 37 && echo
1), 1)
+CFLAGS += -DSUPPORT_CLANG_UNROLL_PRAGMA
+endif
+endif
+
+ifeq ($(RTE_TOOLCHAIN), icc)
+ifeq ($(shell test $(ICC_MAJOR_VERSION) -ge 16 && echo 1), 1)
+CFLAGS += -DSUPPORT_ICC_UNROLL_PRAGMA
+endif
+endif
+
ifeq ($(CONFIG_RTE_LIBRTE_VHOST_NUMA),y)
LDLIBS += -lnuma
endif
diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
index 884befa85..5074226f0 100644
--- a/lib/librte_vhost/vhost.h
+++ b/lib/librte_vhost/vhost.h
@@ -39,6 +39,24 @@
#define VHOST_LOG_CACHE_NR 32
+#ifdef SUPPORT_GCC_UNROLL_PRAGMA
+#define PRAGMA_PARAM "GCC unroll 4"
+#endif
+
+#ifdef SUPPORT_CLANG_UNROLL_PRAGMA
+#define PRAGMA_PARAM "unroll 4"
+#endif
+
+#ifdef SUPPORT_ICC_UNROLL_PRAGMA
+#define PRAGMA_PARAM "unroll (4)"
+#endif
+
+#ifdef PRAGMA_PARAM
+#define UNROLL_PRAGMA(param) _Pragma(param)
+#else
+#define UNROLL_PRAGMA(param) do {} while(0);
+#endif
+
/**
* Structure contains buffer address, length and descriptor index
* from vring to do scatter RX.
--
2.17.1
