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From: Tyler Retzlaff <roretzla@linux.microsoft.com>
To: dev@dpdk.org
Cc: Bruce Richardson <bruce.richardson@intel.com>,
Konstantin Ananyev <konstantin.v.ananyev@yandex.ru>,
Ciara Power <ciara.power@intel.com>, thomas@monjalon.net,
david.marchand@redhat.com, mb@smartsharesystems.com,
Tyler Retzlaff <roretzla@linux.microsoft.com>
Subject: [PATCH v11 06/16] eal: use prefetch intrinsics
Date: Fri, 11 Aug 2023 12:20:48 -0700
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Inline assembly is not supported for MSVC x64 instead use _mm_prefetch
and _mm_cldemote intrinsics.
Signed-off-by: Tyler Retzlaff <roretzla@linux.microsoft.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Morten Brørup <mb@smartsharesystems.com>
Acked-by: Konstantin Ananyev <konstantin.v.ananyev@yandex.ru>
---
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..7a6988e 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
+
+#ifdef RTE_TOOLCHAIN_MSVC
/*
* We use raw byte codes for now as only the newest compiler
* versions support this instruction natively.
@@ -41,8 +49,17 @@ static inline void rte_prefetch_non_temporal(const volatile void *p)
static inline void
rte_cldemote(const volatile void *p)
{
+ _mm_cldemote(p);
+}
+#else
+__rte_experimental
+static inline void
+rte_cldemote(const volatile void *p)
+{
asm volatile(".byte 0x0f, 0x1c, 0x06" :: "S" (p));
}
+#endif
+
#ifdef __cplusplus
}
--
1.8.3.1