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dequant.h 3.78 KB
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#pragma once

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// #include <cuda_fp8.h>
// #include <cuda_bf16.h>
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#include "defines.h"

namespace sm90::decode::sparse_fp8 {

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// struct fp8x8 {
//     // __nv_fp8x4_e4m3 lo;
//     // __nv_fp8x4_e4m3 hi;
// };

// struct fp8x16 {
//     fp8x8 lo;
//     fp8x8 hi;
// };

// __device__ __forceinline__
// bf16x8 cvt_fp8x8_bf16x8(const fp8x8 &inputs, const __nv_bfloat162 &scale_bf162) {
//     #define DEQUANT_FP8x4(OUTPUT_BF16_LO, OUTPUT_BF16_HI, FP8x4) \
//     { \
//         float4 fp32x4 = (float4)(FP8x4); \
//         OUTPUT_BF16_LO = __float22bfloat162_rn({fp32x4.x, fp32x4.y})*scale_bf162; \
//         OUTPUT_BF16_HI = __float22bfloat162_rn({fp32x4.z, fp32x4.w})*scale_bf162; \
//     }

//     bf16x8 result;
//     DEQUANT_FP8x4(result.a01, result.a23, inputs.lo);
//     DEQUANT_FP8x4(result.a45, result.a67, inputs.hi);

//     return result;
// }

// enum class L1CacheHint {
//     NO_ALLOCATE,
//     EVICT_FIRST,
//     EVICT_NORMAL,
//     EVICT_LAST
// };

// enum class L2PrefetchHint {
//     B64,
//     B128,
//     B256
// };

// template<
//     typename T,
//     L1CacheHint l1_cache_hint,
//     L2PrefetchHint l2_prefetch_hint
// >
// __device__ __forceinline__
// T load_128b_from_gmem(const void* addr) {
//     static_assert(sizeof(T) == 128/8);
//     int4 ret;

//     #define EXEC(L1_HINT_STR, L2_HINT_STR) { \
//         asm volatile("ld.global.nc.L1::" L1_HINT_STR ".L2::" L2_HINT_STR ".v4.s32 {%0, %1, %2, %3}, [%4];" \
//             : "=r"(ret.x), "=r"(ret.y), "=r"(ret.z), "=r"(ret.w) \
//             : "l"(addr)); \
//     }

//     #define DISPATCH_L2(L1_HINT_STR) { \
//         if constexpr(l2_prefetch_hint == L2PrefetchHint::B64) \
//             EXEC(L1_HINT_STR, "64B") \
//         else if constexpr(l2_prefetch_hint == L2PrefetchHint::B128) \
//             EXEC(L1_HINT_STR, "128B") \
//         else if constexpr(l2_prefetch_hint == L2PrefetchHint::B256) \
//             EXEC(L1_HINT_STR, "256B") \
//     }

//     if constexpr(l1_cache_hint == L1CacheHint::NO_ALLOCATE)
//         DISPATCH_L2("no_allocate")
//     else if constexpr(l1_cache_hint == L1CacheHint::EVICT_FIRST)
//         DISPATCH_L2("evict_first")
//     else if constexpr(l1_cache_hint == L1CacheHint::EVICT_NORMAL)
//         DISPATCH_L2("evict_normal")
//     else if constexpr(l1_cache_hint == L1CacheHint::EVICT_LAST)
//         DISPATCH_L2("evict_last")

//     #undef EXEC
//     #undef DISPATCH_L2
//     return *reinterpret_cast<T*>(&ret);
// }

// template<
//     typename T,
//     L1CacheHint l1_cache_hint,
//     L2PrefetchHint l2_prefetch_hint
// >
// __device__ __forceinline__
// T load_64b_from_gmem(const void* addr) {
//     static_assert(sizeof(T) == 64/8);
//     int2 ret;

//     #define EXEC(L1_HINT_STR, L2_HINT_STR) { \
//         asm volatile("ld.global.nc.L1::" L1_HINT_STR ".L2::" L2_HINT_STR ".v2.s32 {%0, %1}, [%2];" \
//             : "=r"(ret.x), "=r"(ret.y) \
//             : "l"(addr)); \
//     }

//     #define DISPATCH_L2(L1_HINT_STR) { \
//         if constexpr(l2_prefetch_hint == L2PrefetchHint::B64) \
//             EXEC(L1_HINT_STR, "64B") \
//         else if constexpr(l2_prefetch_hint == L2PrefetchHint::B128) \
//             EXEC(L1_HINT_STR, "128B") \
//         else if constexpr(l2_prefetch_hint == L2PrefetchHint::B256) \
//             EXEC(L1_HINT_STR, "256B") \
//     }

//     if constexpr(l1_cache_hint == L1CacheHint::NO_ALLOCATE)
//         DISPATCH_L2("no_allocate")
//     else if constexpr(l1_cache_hint == L1CacheHint::EVICT_FIRST)
//         DISPATCH_L2("evict_first")
//     else if constexpr(l1_cache_hint == L1CacheHint::EVICT_NORMAL)
//         DISPATCH_L2("evict_normal")
//     else if constexpr(l1_cache_hint == L1CacheHint::EVICT_LAST)
//         DISPATCH_L2("evict_last")

//     #undef EXEC
//     #undef DISPATCH_L2
//     return *reinterpret_cast<T*>(&ret);
// }
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}