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memcpy_async should cache only in L2 when possible #220

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merged 2 commits into from
Nov 5, 2021
Merged

memcpy_async should cache only in L2 when possible #220

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a08d5b9
memcpy_async with 16 byte alignment uses cg and pass src size
gonzalobg Oct 28, 2021
652c092
Pass src_size to memcpy_async 4 and 8 byte alignment specializations
gonzalobg Oct 28, 2021
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6 changes: 3 additions & 3 deletions include/cuda/std/barrier
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Original file line number Diff line number Diff line change
Expand Up @@ -306,7 +306,7 @@ template<>
struct __memcpy_async_impl<4, false> {
__device__ static inline bool __copy(char * __destination, char const * __source, std::size_t __total_size, std::size_t __rank, std::size_t __stride) {
for (std::size_t __offset = __rank * 4; __offset < __total_size; __offset += __stride * 4) {
asm volatile ("cp.async.ca.shared.global [%0], [%1], 4;"
asm volatile ("cp.async.ca.shared.global [%0], [%1], 4, 4;"
:: "r"(static_cast<std::uint32_t>(__cvta_generic_to_shared(__destination + __offset))),
"l"(__source + __offset)
: "memory");
Expand All @@ -319,7 +319,7 @@ template<>
struct __memcpy_async_impl<8, false> {
__device__ static inline bool __copy(char * __destination, char const * __source, std::size_t __total_size, std::size_t __rank, std::size_t __stride) {
for (std::size_t __offset = __rank * 8; __offset < __total_size; __offset += __stride * 8) {
asm volatile ("cp.async.ca.shared.global [%0], [%1], 8;"
asm volatile ("cp.async.ca.shared.global [%0], [%1], 8, 8;"
:: "r"(static_cast<std::uint32_t>(__cvta_generic_to_shared(__destination + __offset))),
"l"(__source + __offset)
: "memory");
Expand All @@ -332,7 +332,7 @@ template<>
struct __memcpy_async_impl<16, false> {
__device__ static inline bool __copy(char * __destination, char const * __source, std::size_t __total_size, std::size_t __rank, std::size_t __stride) {
for (std::size_t __offset = __rank * 16; __offset < __total_size; __offset += __stride * 16) {
asm volatile ("cp.async.ca.shared.global [%0], [%1], 16;"
asm volatile ("cp.async.cg.shared.global [%0], [%1], 16, 16;"
:: "r"(static_cast<std::uint32_t>(__cvta_generic_to_shared(__destination + __offset))),
"l"(__source + __offset)
: "memory");
Expand Down