eal/x86: fix strict aliasing rules

Fixed strict-aliasing rules breaking errors for some GCC version.

Signed-off-by: Zhihong Wang <zhihong.wang@intel.com>
Acked-by: Cunming Liang <cunming.liang@intel.com>
Acked-by: Michael Qiu <michael.qiu@intel.com>

diff --git a/lib/librte_eal/common/include/arch/x86/rte_memcpy.h b/lib/librte_eal/common/include/arch/x86/rte_memcpy.h
index 7b2d382..0a9e3a8 100644 (file)
--- a/lib/librte_eal/common/include/arch/x86/rte_memcpy.h
+++ b/lib/librte_eal/common/include/arch/x86/rte_memcpy.h
@@ -195,6 +195,8 @@ rte_mov256blocks(uint8_t *dst, const uint8_t *src, size_t n)
 static inline void *
 rte_memcpy(void *dst, const void *src, size_t n)
 {
+       uintptr_t dstu = (uintptr_t)dst;
+       uintptr_t srcu = (uintptr_t)src;
        void *ret = dst;
        int dstofss;
        int bits;
@@ -204,22 +206,22 @@ rte_memcpy(void *dst, const void *src, size_t n)
         */
        if (n < 16) {
                if (n & 0x01) {
-                       *(uint8_t *)dst = *(const uint8_t *)src;
-                       src = (const uint8_t *)src + 1;
-                       dst = (uint8_t *)dst + 1;
+                       *(uint8_t *)dstu = *(const uint8_t *)srcu;
+                       srcu = (uintptr_t)((const uint8_t *)srcu + 1);
+                       dstu = (uintptr_t)((uint8_t *)dstu + 1);
                }
                if (n & 0x02) {
-                       *(uint16_t *)dst = *(const uint16_t *)src;
-                       src = (const uint16_t *)src + 1;
-                       dst = (uint16_t *)dst + 1;
+                       *(uint16_t *)dstu = *(const uint16_t *)srcu;
+                       srcu = (uintptr_t)((const uint16_t *)srcu + 1);
+                       dstu = (uintptr_t)((uint16_t *)dstu + 1);
                }
                if (n & 0x04) {
-                       *(uint32_t *)dst = *(const uint32_t *)src;
-                       src = (const uint32_t *)src + 1;
-                       dst = (uint32_t *)dst + 1;
+                       *(uint32_t *)dstu = *(const uint32_t *)srcu;
+                       srcu = (uintptr_t)((const uint32_t *)srcu + 1);
+                       dstu = (uintptr_t)((uint32_t *)dstu + 1);
                }
                if (n & 0x08) {
-                       *(uint64_t *)dst = *(const uint64_t *)src;
+                       *(uint64_t *)dstu = *(const uint64_t *)srcu;
                }
                return ret;
        }
@@ -492,6 +494,8 @@ static inline void *
 rte_memcpy(void *dst, const void *src, size_t n)
 {
        __m128i xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7, xmm8;
+       uintptr_t dstu = (uintptr_t)dst;
+       uintptr_t srcu = (uintptr_t)src;
        void *ret = dst;
        int dstofss;
        int srcofs;
@@ -501,22 +505,22 @@ rte_memcpy(void *dst, const void *src, size_t n)
         */
        if (n < 16) {
                if (n & 0x01) {
-                       *(uint8_t *)dst = *(const uint8_t *)src;
-                       src = (const uint8_t *)src + 1;
-                       dst = (uint8_t *)dst + 1;
+                       *(uint8_t *)dstu = *(const uint8_t *)srcu;
+                       srcu = (uintptr_t)((const uint8_t *)srcu + 1);
+                       dstu = (uintptr_t)((uint8_t *)dstu + 1);
                }
                if (n & 0x02) {
-                       *(uint16_t *)dst = *(const uint16_t *)src;
-                       src = (const uint16_t *)src + 1;
-                       dst = (uint16_t *)dst + 1;
+                       *(uint16_t *)dstu = *(const uint16_t *)srcu;
+                       srcu = (uintptr_t)((const uint16_t *)srcu + 1);
+                       dstu = (uintptr_t)((uint16_t *)dstu + 1);
                }
                if (n & 0x04) {
-                       *(uint32_t *)dst = *(const uint32_t *)src;
-                       src = (const uint32_t *)src + 1;
-                       dst = (uint32_t *)dst + 1;
+                       *(uint32_t *)dstu = *(const uint32_t *)srcu;
+                       srcu = (uintptr_t)((const uint32_t *)srcu + 1);
+                       dstu = (uintptr_t)((uint32_t *)dstu + 1);
                }
                if (n & 0x08) {
-                       *(uint64_t *)dst = *(const uint64_t *)src;
+                       *(uint64_t *)dstu = *(const uint64_t *)srcu;
                }
                return ret;
        }