After the instruction set updates for MSVC the error below popped up:
..\lib\eal\x86\include\rte_vect.h(82): error C2059: syntax error: '('
The issue is that MSVC does not allow __rte_aligned(RTE_X86_ZMM_SIZE).
It only accepts numbers that are power of 2. So, even though
RTE_X86_ZMM_SIZE represents a number that is a power of two it cannot
be used directly.
https://learn.microsoft.com/en-us/cpp/cpp/align-cpp?view=msvc-170
Signed-off-by: Andre Muezerie <andre...@linux.microsoft.com>
Acked-by: Bruce Richardson <bruce.richard...@intel.com>
---
lib/eal/x86/include/rte_vect.h | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/lib/eal/x86/include/rte_vect.h b/lib/eal/x86/include/rte_vect.h
index 70c78e9b77..9ea158b27e 100644
--- a/lib/eal/x86/include/rte_vect.h
+++ b/lib/eal/x86/include/rte_vect.h
@@ -76,9 +76,18 @@ __extension__ ({ \
#ifdef __AVX512F__
-#define RTE_X86_ZMM_SIZE (sizeof(__m512i))
+#define RTE_X86_ZMM_SIZE 64
#define RTE_X86_ZMM_MASK (RTE_X86_ZMM_SIZE - 1)
+/*
+ * MSVC does not allow __rte_aligned(sizeof(__m512i)). It only accepts
+ * numbers that are power of 2. So, even though sizeof(__m512i) represents a
+ * number that is a power of two it cannot be used directly.
+ * Ref: https://learn.microsoft.com/en-us/cpp/cpp/align-cpp?view=msvc-170
+ * The static assert below ensures that the hardcoded value defined as
+ * RTE_X86_ZMM_SIZE is equal to sizeof(__m512i).
+ */
+static_assert(RTE_X86_ZMM_SIZE == (sizeof(__m512i)), "Unexpected size of
__m512i");
typedef union __rte_aligned(RTE_X86_ZMM_SIZE) __rte_x86_zmm {
__m512i z;
ymm_t y[RTE_X86_ZMM_SIZE / sizeof(ymm_t)];
--
2.48.1.vfs.0.0
