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[CK_Tile] Support for a4w4 (fp4) in block scale gemm AB quant (#3603)

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* chore: split block scale example instances in more separate files to speed up compile times

* wip: fp4 scaffolding for abquant

* feat: add fp4 decoding-while-loading to abquant pipeline

* feat: add support for fp4 CPU verification in abquant

* chore: add time tracking to reference calculation

* feat: add a4w4 test for blockscale gemm

* feat: optimize reference calculation by preconverting values to AccType

* feat: add fp4 to fp8 look-up table

* fix: reference to wrong ComputeDataType field in QuantProblem

* feat: type utilities for determining MFMA compute types

* feat: packed fp4 for abquant weight preshuffle

* feat: add separate tests for a4w4 base case, padding and preshuffleB

* fix: fp4 conversion on gfx950 attempting to use non-supported method

* fix: test case was using quant group sizes which don't work on gfx950 due to larger mfma tile size

* chore: add fp4 preshuffleb mode to block scale example

* chore: sanity check for packed types being 1 byte

* chore: clarify tensor dimension indices with constants

* chore: replace traits check with specialized check for packed types

* style: some minor refactoring and cleanup

* fix: correct conversion table for FNUZ fp8

* chore: add fp4 instances to main abquant instances again

* chore: use same initialization branch for int4 and fp4

* chore: add missing initialization for fp4 in block scale gemm example

---------

Co-authored-by: Thomas Ning <Thomas.Ning@amd.com>

[ROCm/composable_kernel commit: 6a6177a246]
This commit is contained in:
Erwin Terpstra
2026-01-30 12:40:50 +01:00
committed by GitHub
parent 1b1dd65b83
commit a5824466fb
28 changed files with 642 additions and 175 deletions
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82
include/ck_tile/host/reference/reference_gemm.hpp
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@@ -137,47 +137,55 @@ CK_TILE_HOST void reference_gemm_abquant(const HostTensor<ADataType>& a_m_k,
const BElementOp& b_element_op = {},
const ACCElementOp& acc_element_op = {})
{
const std::size_t M = a_m_k.get_length(0);
const std::size_t N = b_k_n.get_length(1);
const std::size_t K = a_m_k.get_length(1);
constexpr auto A_TENSOR_M_DIM = 0;
constexpr auto A_TENSOR_K_DIM = 1;
constexpr auto B_TENSOR_K_DIM = 0;
constexpr auto B_TENSOR_N_DIM = 1;
const std::size_t M = a_m_k.get_length(A_TENSOR_M_DIM);
const std::size_t N = b_k_n.get_length(B_TENSOR_N_DIM);
const std::size_t K = a_m_k.get_length(A_TENSOR_K_DIM);
// Pre-convert A/B tensors to AccData type
// This prevents doing slow reconversions for each row/column
HostTensor<AccDataType> a_acc(a_m_k.mDesc);
HostTensor<AccDataType> b_acc(b_k_n.mDesc);
a_acc.ForEach([&](auto& self, auto index) {
if constexpr(std::is_same_v<ADataType, pk_int4_t> || std::is_same_v<ADataType, pk_fp4_t>)
{
const ADataType pk_val = a_element_op(a_m_k(index));
const fp32x2_t fp32_val = pk_val.to_fp32x2();
self(index) = (index[A_TENSOR_K_DIM] & 1) ? fp32_val.hi : fp32_val.lo;
}
else
{
self(index) = ck_tile::type_convert<AccDataType>(a_element_op(a_m_k(index)));
}
});
b_acc.ForEach([&](auto& self, auto index) {
if constexpr(std::is_same_v<BDataType, pk_int4_t> || std::is_same_v<BDataType, pk_fp4_t>)
{
const BDataType pk_val = b_element_op(b_k_n(index));
const fp32x2_t fp32_val = pk_val.to_fp32x2();
self(index) = (index[B_TENSOR_K_DIM] & 1) ? fp32_val.hi : fp32_val.lo;
}
else if constexpr(std::is_same_v<BDataType, fp8_t>)
{
self(index) = fp8_to_float_raw(b_element_op(b_k_n(index)));
}
else
{
self(index) = ck_tile::type_convert<AccDataType>(b_element_op(b_k_n(index)));
}
});
auto f_mn = [&](auto m, auto n) {
AccDataType v_acc = 0;
constexpr std::size_t kGroupK = BQuantGroupSize::kK;
// ---- A loader: dequant A(m,k) into AccDataType ----
auto load_a = [&](std::size_t k) -> AccDataType {
if constexpr(std::is_same_v<ADataType, pk_int4_t>)
{
const pk_int4_t pk_val = a_element_op(a_m_k(m, k));
const fp32x2_t fp32_val = pk_int4_t_to_fp32x2_t(pk_val);
return (k & 1) ? fp32_val.hi : fp32_val.lo;
}
else
{
return ck_tile::type_convert<AccDataType>(a_element_op(a_m_k(m, k)));
}
};
// ---- B loader: dequant B(k,n) into AccDataType ----
auto load_b = [&](std::size_t k) -> AccDataType {
if constexpr(std::is_same_v<BDataType, pk_int4_t>)
{
const pk_int4_t pk_val = b_element_op(b_k_n(k, n));
const fp32x2_t fp32_val = pk_int4_t_to_fp32x2_t(pk_val);
return (k & 1) ? fp32_val.hi : fp32_val.lo;
}
else if constexpr(std::is_same_v<BDataType, fp8_t>)
{
return fp8_to_float_raw(b_element_op(b_k_n(k, n)));
}
else
{
return ck_tile::type_convert<AccDataType>(b_element_op(b_k_n(k, n)));
}
};
// ---- a scale loader for a given K-group index ----
auto load_scale_a = [&](ck_tile::index_t k_group) -> float {
const ck_tile::index_t outer_dim = m / AQuantGroupSize::kM;
@@ -224,8 +232,8 @@ CK_TILE_HOST void reference_gemm_abquant(const HostTensor<ADataType>& a_m_k,
// unscaled accumulation within this K-group
for(std::size_t k = k_begin; k < k_end; ++k)
{
const AccDataType v_a = load_a(k);
const AccDataType v_b = load_b(k);
const AccDataType v_a = a_acc(m, k);
const AccDataType v_b = b_acc(k, n);
v_block_acc += v_a * v_b;
}