[dpdk-dev] [PATCH] eal: add macro to swap two numbers

[Shijith Thotton <sthotton@marvell.com>]

Added a macro to swap two numbers and updated common autotest for the
same.

Signed-off-by: Shijith Thotton <sthotton@marvell.com>
---
Needed-for: drivers: add external clock support for cnxk timer

 app/test/test_common.c       | 4 ++++
 lib/eal/include/rte_common.h | 8 ++++++++
 2 files changed, 12 insertions(+)

diff --git a/app/test/test_common.c b/app/test/test_common.c
index 12bd1cad90..ef177cecb1 100644
--- a/app/test/test_common.c
+++ b/app/test/test_common.c
@@ -30,9 +30,13 @@ test_macros(int __rte_unused unused_parm)
 	return -1;}
 
 	uintptr_t unused = 0;
+	unsigned int smaller = SMALLER, bigger  = BIGGER;
 
 	RTE_SET_USED(unused);
 
+	RTE_SWAP(smaller, bigger);
+	if (smaller != BIGGER && bigger != SMALLER)
+		FAIL_MACRO(RTE_SWAP);
 	if ((uintptr_t)RTE_PTR_ADD(SMALLER, PTR_DIFF) != BIGGER)
 		FAIL_MACRO(RTE_PTR_ADD);
 	if ((uintptr_t)RTE_PTR_SUB(BIGGER, PTR_DIFF) != SMALLER)
diff --git a/lib/eal/include/rte_common.h b/lib/eal/include/rte_common.h
index d5a32c66a5..09661a5469 100644
--- a/lib/eal/include/rte_common.h
+++ b/lib/eal/include/rte_common.h
@@ -810,6 +810,14 @@ rte_log2_u64(uint64_t v)
 /** Number of elements in the array. */
 #define	RTE_DIM(a)	(sizeof (a) / sizeof ((a)[0]))
 
+/** Macro to swap two numbers. */
+#define RTE_SWAP(a, b) \
+	__extension__ ({ \
+		typeof (a) _a = a; \
+		a = b; \
+		b = _a; \
+	})
+
 /**
  * Converts a numeric string to the equivalent uint64_t value.
  * As well as straight number conversion, also recognises the suffixes
-- 
2.25.1