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ayo committed 2026-10-16 05:20:08 -04:00
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tools/windows/wmma_gfx1201.hip
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// Independent gfx12 WMMA layout probe. This deliberately does not use d4r fragments.
// A and B are row-major [logical row/column][K]; the intrinsic receives B,A
// so its output is row=A, column=B, as in AMD's RDNA 4 WMMA guide.
using h8 = _Float16 __attribute__((ext_vector_type(8)));
using f8 = float __attribute__((ext_vector_type(8)));
#include "../../kernels/common/wmma_backend.h"
#include "../../kernels/common/wmma_layout.h"
extern "C" __attribute__((global)) void d4r_wmma_swap_test(float* output)
{
const unsigned int lane = __builtin_amdgcn_workitem_id_x();
if (lane < 32u) {
output[lane] = d4r_wmma_other_half(static_cast<float>(lane));
output[32u + lane] = static_cast<float>(__builtin_amdgcn_mbcnt_lo(~0u, 0u));
}
}
extern "C" __attribute__((global)) void d4r_wmma_gfx1201(
const unsigned short* a_bits, const unsigned short* b_bits,
const float* initial_c, float* output, unsigned int steps)
{
const unsigned int lane = __builtin_amdgcn_workitem_id_x();
if (lane >= 32u) return;
const unsigned int row = lane & 15u;
const unsigned int group = lane >> 4;
const _Float16* a = reinterpret_cast<const _Float16*>(a_bits);
const _Float16* b = reinterpret_cast<const _Float16*>(b_bits);
#if defined(__GFX12__)
h8 a_frag, b_frag;
f8 c_frag;
for (unsigned int i = 0; i < 8u; ++i) {
a_frag[i] = a[row * 16u + group * 8u + i];
b_frag[i] = b[row * 16u + group * 8u + i];
c_frag[i] = initial_c[row * 16u + group * 8u + i];
}
f8 result = __builtin_amdgcn_wmma_f32_16x16x16_f16_w32_gfx12(
b_frag, a_frag, c_frag);
if (steps == 2u)
result = __builtin_amdgcn_wmma_f32_16x16x16_f16_w32_gfx12(
b_frag, a_frag, result);
for (unsigned int i = 0; i < 8u; ++i)
output[row * 16u + group * 8u + i] = result[i];
#else
// Adapted from realdody/d4r ae530b0: real gfx11 operands/accumulators,
// independent of the shared layout abstraction.
d4r_wmma_h16 a_frag, b_frag;
d4r_wmma_f8 c_frag;
for (unsigned int i = 0; i < 16u; ++i) {
a_frag[i] = a[row * 16u + i];
b_frag[i] = b[row * 16u + i];
}
for (unsigned int i = 0; i < 8u; ++i)
c_frag[i] = initial_c[(2u * i + group) * 16u + row];
d4r_wmma_f8 result = __builtin_amdgcn_wmma_f32_16x16x16_f16_w32(a_frag, b_frag, c_frag);
if (steps == 2u)
result = __builtin_amdgcn_wmma_f32_16x16x16_f16_w32(a_frag, b_frag, result);
for (unsigned int i = 0; i < 8u; ++i)
output[(2u * i + group) * 16u + row] = result[i];
#endif
}
// d4r's original gfx11 fragment contract, exercised independently of K/M.
extern "C" __attribute__((global)) void d4r_wmma_legacy_contract(
const unsigned short* a_bits, const unsigned short* b_bits,
const float* initial_c, float* output, unsigned int steps)
{
const unsigned int lane = __builtin_amdgcn_workitem_id_x();
if (lane >= 32u) return;
const unsigned int token = lane & 15u;
const unsigned int group = lane >> 4;
const _Float16* a = reinterpret_cast<const _Float16*>(a_bits);
const _Float16* b = reinterpret_cast<const _Float16*>(b_bits);
d4r_wmma_h16 a_frag, b_frag;
d4r_wmma_f8 c_frag;
for (unsigned int i = 0; i < 16u; ++i) {
a_frag[i] = a[token * 16u + i];
b_frag[i] = b[token * 16u + i];
}
for (unsigned int i = 0; i < 8u; ++i)
c_frag[i] = initial_c[(2u * i + group) * 16u + token];
d4r_wmma_f8 result = d4r_wmma_legacy_layout(a_frag, b_frag, c_frag);
if (steps == 2u)
result = d4r_wmma_legacy_layout(a_frag, b_frag, result);
for (unsigned int i = 0; i < 8u; ++i)
output[(2u * i + group) * 16u + token] = result[i];
}
// Upstream's native per-target layout, including accumulator -> next-operand
// packing. It must match the same scalar reference as the independent probe.
extern "C" __attribute__((global)) void d4r_wmma_upstream_contract(
const unsigned short* a_bits, const unsigned short* b_bits,
const float* initial_c, float* output, unsigned int steps)
{
const unsigned int lane = __builtin_amdgcn_workitem_id_x();
if (lane >= 32u) return;
const unsigned int token = lane & 15u;
const _Float16* a = reinterpret_cast<const _Float16*>(a_bits);
const _Float16* b = reinterpret_cast<const _Float16*>(b_bits);
const wm_op a_frag = wm_op_load(a + token * 16u);
const wm_op b_frag = wm_op_load(b + token * 16u);
wm_f8v c_frag;
for (unsigned int i = 0; i < 8u; ++i)
c_frag[i] = initial_c[wm_acc_row(i) * 16u + token];
wm_f8v result = wm_mma(a_frag, b_frag, c_frag);
if (steps == 2u)
result = wm_mma(a_frag, b_frag, result);
// Fixture values are exactly representable as FP16. Checking this roundtrip
// catches a wrong gfx12 fragment reconstruction without a tolerance mask.
const wm_op next_operand = wm_op_from_f8(result);
for (unsigned int i = 0; i < 8u; ++i)
output[wm_acc_row(i) * 16u + token] = static_cast<float>(wm_op_acc_elem(next_operand, i));
}