[PATCH v6 06/15] eal: use prefetch intrinsics

[Tyler Retzlaff]

Inline assembly is not supported for MSVC x64 instead use _mm_prefetch
and _mm_cldemote intrinsics.

Signed-off-by: Tyler Retzlaff <roretzla at linux.microsoft.com>
Acked-by: Bruce Richardson <bruce.richardson at intel.com>
---
 lib/eal/x86/include/rte_prefetch.h | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

diff --git a/lib/eal/x86/include/rte_prefetch.h b/lib/eal/x86/include/rte_prefetch.h
index 7fd01c4..239e611 100644
--- a/lib/eal/x86/include/rte_prefetch.h
+++ b/lib/eal/x86/include/rte_prefetch.h
@@ -9,30 +9,38 @@
 extern "C" {
 #endif
 
+#include <emmintrin.h>
+
 #include <rte_compat.h>
 #include <rte_common.h>
 #include "generic/rte_prefetch.h"
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wcast-qual"
+
 static inline void rte_prefetch0(const volatile void *p)
 {
-	asm volatile ("prefetcht0 %[p]" : : [p] "m" (*(const volatile char *)p));
+	_mm_prefetch((const void *)p, _MM_HINT_T0);
 }
 
 static inline void rte_prefetch1(const volatile void *p)
 {
-	asm volatile ("prefetcht1 %[p]" : : [p] "m" (*(const volatile char *)p));
+	_mm_prefetch((const void *)p, _MM_HINT_T1);
 }
 
 static inline void rte_prefetch2(const volatile void *p)
 {
-	asm volatile ("prefetcht2 %[p]" : : [p] "m" (*(const volatile char *)p));
+	_mm_prefetch((const void *)p, _MM_HINT_T2);
 }
 
 static inline void rte_prefetch_non_temporal(const volatile void *p)
 {
-	asm volatile ("prefetchnta %[p]" : : [p] "m" (*(const volatile char *)p));
+	_mm_prefetch((const void *)p, _MM_HINT_NTA);
 }
 
+#pragma GCC diagnostic pop
+
+#ifndef RTE_TOOLCHAIN_MSVC
 /*
  * We use raw byte codes for now as only the newest compiler
  * versions support this instruction natively.
@@ -43,6 +51,15 @@ static inline void rte_prefetch_non_temporal(const volatile void *p)
 {
 	asm volatile(".byte 0x0f, 0x1c, 0x06" :: "S" (p));
 }
+#else
+__rte_experimental
+static inline void
+rte_cldemote(const volatile void *p)
+{
+	_mm_cldemote(p);
+}
+#endif
+
 
 #ifdef __cplusplus
 }
-- 
1.8.3.1