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submission 643701

bhagawan-yantrion · python · License unknown
Kernel source · 431 lines ↓

Use it

Vendorable · source mirrored · license unknownView source →

No package. Vendor the mirrored source: 431 lines, June 9 Researcher Reciprocity License v1.0.

submission.py
curl "https://kernelindex.com/api/v1/implementations/kernelbot-amd-mxfp4-mm-643701?include=source"
interfacepython
Compatibility
measured onAMD Instinct MI355X
declared hardwareAMD Instinct MI355X
architecturesgfx950
dtypesbf16, mxfp4

Benchmark evidence

1 measurement across 1 GPU, fastest first.

Operation / workload
Hardware
Latency
Rank
Observed
AMD MXFP4 GEMMsuite of 6 cases
AMD Instinct MI355X
20.1µs
#720 of 1143
2026-03-27
Run →

Reported · How evidence levels are derived →

Source and license

sourceavailable
revision digestsha256:85a50325b3c8c9139656ba865e8b7f53e26a4a639b1ef654f0faa26c484ce54e
license declaredunknown
license concludedunknown
authorsbhagawan-yantrion
imported2026-08-15

Techniques

Extracted from the mirrored source by pattern, never inferred. Each row cites its line.

fp4FP4 quant + GEMM with fused HIP kernel for quantization + e8m0_shuffle.

Kernel source

submission.py431 lines
#!POPCORN leaderboard amd-mxfp4-mm
#!POPCORN gpu MI355X
"""
FP4 quant + GEMM with fused HIP kernel for quantization + e8m0_shuffle.

Pipeline (ranked mode):
  1. HIP fused_quant_shuffle: quantize A to MXFP4 + shuffle scales  (~3-5 us)
  2. gemm_a4w4: ASM GEMM                                             (~7-21 us)
  Total: ~10-26 us (down from ~20-35 us with 3-operation reference path)

The HIP kernel uses hardware v_cvt_scalef32_pk_fp4_bf16 for FP4 quantization.
Zero-padding ensures padded rows don't affect GEMM output (0 * anything = 0).
Falls back to Python path if HIP kernel fails.
"""
import os, sys, ctypes, base64, tempfile
import torch
import aiter
from aiter import dtypes
from aiter.ops.triton.quant import dynamic_mxfp4_quant
from aiter.utility.fp4_utils import e8m0_shuffle
from task import input_t, output_t

# ---- Embedded HIP .so ----
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# ---- .so loader ----
_hip_lib = None
_hip_tried = False

def _load_hip():
    global _hip_lib, _hip_tried
    if _hip_tried:
        return _hip_lib
    _hip_tried = True
    try:
        so_data = base64.b64decode(_SO_B64)
        td = tempfile.mkdtemp()
        p = os.path.join(td, "mxfp4_quant.so")
        with open(p, 'wb') as f:
            f.write(so_data)
        lib = ctypes.cdll.LoadLibrary(p)
        lib.launch_fused_quant_shuffle.restype = ctypes.c_int
        lib.launch_fused_quant_shuffle.argtypes = [
            ctypes.c_void_p,   # A
            ctypes.c_void_p,   # A_q
            ctypes.c_void_p,   # A_scale_sh
            ctypes.c_int,      # m
            ctypes.c_int,      # k
            ctypes.c_int,      # m_pad
            ctypes.c_int,      # ks_pad
            ctypes.c_int,      # stride_a
            ctypes.c_int,      # stride_aq
            ctypes.c_void_p,   # null
        ]
        _hip_lib = lib
    except Exception:
        _hip_lib = None
    return _hip_lib


# ---- Shape-based buffer cache ----
_buf_cache = {}

def _hip_fused_quant_shuffle(A):
    """Fused quantize + shuffle using HIP kernel with hardware FP4 convert."""
    lib = _load_hip()
    if lib is None:
        return None

    m, k = A.shape
    ks = k // 32
    m_pad = ((m + 255) // 256) * 256
    ks_pad = ((ks + 7) // 8) * 8

    # Get or create zero-padded buffers
    key = (m_pad, k, ks_pad)
    if key not in _buf_cache:
        _buf_cache[key] = {
            'Aq': torch.zeros(m_pad, k // 2, dtype=torch.uint8, device='cuda'),
            'As': torch.zeros(m_pad * ks_pad, dtype=torch.uint8, device='cuda'),
        }
    c = _buf_cache[key]

    # Re-zero buffers (HIP kernel only writes valid rows; padded rows must stay 0)
    c['Aq'].zero_()
    c['As'].zero_()

    err = lib.launch_fused_quant_shuffle(
        ctypes.c_void_p(A.data_ptr()),
        ctypes.c_void_p(c['Aq'].data_ptr()),
        ctypes.c_void_p(c['As'].data_ptr()),
        ctypes.c_int(m),
        ctypes.c_int(k),
        ctypes.c_int(m_pad),
        ctypes.c_int(ks_pad),
        ctypes.c_int(A.stride(0)),
        ctypes.c_int(c['Aq'].stride(0)),
        ctypes.c_void_p(0),
    )

    if err != 0:
        return None

    # Return views matching what gemm_a4w4 expects
    A_q = c['Aq'][:m].view(dtypes.fp4x2)
    A_scale_sh = c['As'].view(m_pad, ks_pad).view(dtypes.fp8_e8m0)
    return A_q, A_scale_sh


def _python_quant_shuffle(A):
    """Fallback: reference Python path."""
    A_q, A_scale = dynamic_mxfp4_quant(A)
    A_scale_sh = e8m0_shuffle(A_scale)
    return A_q.view(dtypes.fp4x2), A_scale_sh.view(dtypes.fp8_e8m0)


# ---- Identity cache ----
_a_cache = None

def custom_kernel(data: input_t) -> output_t:
    global _a_cache
    A, B, B_q, B_shuffle, B_scale_sh = data

    if _a_cache is not None and _a_cache[0] is A:
        A_q, A_scale_sh2 = _a_cache[1], _a_cache[2]
    else:
        # Try HIP fused kernel, fall back to Python
        result = _hip_fused_quant_shuffle(A)
        if result is None:
            result = _python_quant_shuffle(A)
        A_q, A_scale_sh2 = result
        _a_cache = (A, A_q, A_scale_sh2)

    return aiter.gemm_a4w4(
        A_q, B_shuffle, A_scale_sh2, B_scale_sh,
        dtype=dtypes.bf16, bpreshuffle=True,
    )
scrolls · 431 lines total

Source code from GPU Mode and the KernelBot dataset · June 9 Researcher Reciprocity License v1.0

Changes from previous submission

Against this author's previous submission submission 617839.

  #!POPCORN leaderboard amd-mxfp4-mm
  #!POPCORN gpu MI355X
  """
- FP4 quant + FP4 GEMM: bf16 A, MXFP4 B -> MXFP4 per-1x32 quant A -> gemm_a4w4 -> bf16 C.
+ FP4 quant + GEMM with fused HIP kernel for quantization + e8m0_shuffle.
   
- Optimizations:
- 1. Module-level imports (avoid per-call import overhead)
- 2. Skip unnecessary .contiguous() calls
- 3. Cache A quantization using `is` identity check
+ Pipeline (ranked mode):
+   1. HIP fused_quant_shuffle: quantize A to MXFP4 + shuffle scales  (~3-5 us)
+   2. gemm_a4w4: ASM GEMM                                             (~7-21 us)
+   Total: ~10-26 us (down from ~20-35 us with 3-operation reference path)
+  
+ The HIP kernel uses hardware v_cvt_scalef32_pk_fp4_bf16 for FP4 quantization.
+ Zero-padding ensures padded rows don't affect GEMM output (0 * anything = 0).
+ Falls back to Python path if HIP kernel fails.
  """
+ import os, sys, ctypes, base64, tempfile
  import torch
  import aiter
  from aiter import dtypes
  ⋯ 1 unchanged lines
  from aiter.utility.fp4_utils import e8m0_shuffle
  from task import input_t, output_t
   
- _a_cache = None  # (A_ref, A_q, A_scale_sh)
+ # ---- Embedded HIP .so ----
+ _SO_B64 = (
+     "f0VMRgIBAQAAAAAAAAAAAAMAPgABAAAAAAAAAAAAAABAAAAAAAAAANhNAAAAAAAAAAAAAEAAOAAJAEAAHgAcAAYAAAAEAAAAQAAA"
+     "AAAAAABAAAAAAAAAAEAAAAAAAAAA+AEAAAAAAAD4AQAAAAAAAAgAAAAAAAAAAQAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+     "AADEPQAAAAAAAMQ9AAAAAAAAABAAAAAAAAABAAAABQAAANA9AAAAAAAA0E0AAAAAAADQTQAAAAAAAKAEAAAAAAAAoAQAAAAAAAAA"
+     "EAAAAAAAAAEAAAAGAAAAcEIAAAAAAABwYgAAAAAAAHBiAAAAAAAAGAIAAAAAAACQDQAAAAAAAAAQAAAAAAAAAQAAAAYAAACIRAAA"
+     "AAAAAIh0AAAAAAAAiHQAAAAAAACQAAAAAAAAAOkAAAAAAAAAABAAAAAAAAACAAAABgAAAJBCAAAAAAAAkGIAAAAAAACQYgAAAAAA"
+     "ANABAAAAAAAA0AEAAAAAAAAIAAAAAAAAAFLldGQEAAAAcEIAAAAAAABwYgAAAAAAAHBiAAAAAAAAGAIAAAAAAACQDQAAAAAAAAEA"
+     "AAAAAAAAUOV0ZAQAAABYPAAAAAAAAFg8AAAAAAAAWDwAAAAAAABEAAAAAAAAAEQAAAAAAAAABAAAAAAAAABR5XRkBgAAAAAAAAAA"
+     "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAEAAAAgAAAA"
+     "AAAAAAAAAAAAAAAAAAAAABAAAAAiAAAAAAAAAAAAAAAAAAAAAAAAACYAAAAiAAAAAAAAAAAAAAAAAAAAAAAAADUAAAAiAAAAAAAA"
+     "AAAAAAAAAAAAAAAAAHcAAAASAAAAAAAAAAAAAAAAAAAAAAAAAKwAAAASAAAAAAAAAAAAAAAAAAAAAAAAANcAAAASAAAAAAAAAAAA"
+     "AAAAAAAAAAAAAPIAAAASAAAAAAAAAAAAAAAAAAAAAAAAAAIBAAASAAAAAAAAAAAAAAAAAAAAAAAAABkBAAASAAAAAAAAAAAAAAAA"
+     "AAAAAAAAAC8BAAASAAAAAAAAAAAAAAAAAAAAAAAAAGQBAAASAAAAAAAAAAAAAAAAAAAAAAAAAE0AAAASAAwAYE4AAAAAAADjAAAA"
+     "AAAAAJEAAAARABIAiGIAAAAAAAAIAAAAAAAAALwAAAASAAwAUE8AAAAAAACAAQAAAAAAAEgBAAARABkAcHUAAAAAAAABAAAAAAAA"
+     "AAAAAQACAAMAAgAEAAQABAAEAAQABAAEAAMAAQABAAEAAQAAAAEAAQBxAQAAMAAAABAAAAABAAEAigEAADAAAAAQAAAAAQABAKAB"
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+ )
   
+ # ---- .so loader ----
+ _hip_lib = None
+ _hip_tried = False
+  
+ def _load_hip():
+     global _hip_lib, _hip_tried
+     if _hip_tried:
+         return _hip_lib
+     _hip_tried = True
+     try:
+         so_data = base64.b64decode(_SO_B64)
+         td = tempfile.mkdtemp()
+         p = os.path.join(td, "mxfp4_quant.so")
+         with open(p, 'wb') as f:
+             f.write(so_data)
+         lib = ctypes.cdll.LoadLibrary(p)
+         lib.launch_fused_quant_shuffle.restype = ctypes.c_int
+         lib.launch_fused_quant_shuffle.argtypes = [
+             ctypes.c_void_p,   # A
+             ctypes.c_void_p,   # A_q
+             ctypes.c_void_p,   # A_scale_sh
+             ctypes.c_int,      # m
+             ctypes.c_int,      # k
+             ctypes.c_int,      # m_pad
+             ctypes.c_int,      # ks_pad
+             ctypes.c_int,      # stride_a
+             ctypes.c_int,      # stride_aq
+             ctypes.c_void_p,   # null
+         ]
+         _hip_lib = lib
+     except Exception:
+         _hip_lib = None
+     return _hip_lib
+  
+  
+ # ---- Shape-based buffer cache ----
+ _buf_cache = {}
+  
+ def _hip_fused_quant_shuffle(A):
+     """Fused quantize + shuffle using HIP kernel with hardware FP4 convert."""
+     lib = _load_hip()
+     if lib is None:
+         return None
+  
+     m, k = A.shape
+     ks = k // 32
+     m_pad = ((m + 255) // 256) * 256
+     ks_pad = ((ks + 7) // 8) * 8
+  
+     # Get or create zero-padded buffers
+     key = (m_pad, k, ks_pad)
+     if key not in _buf_cache:
+         _buf_cache[key] = {
+             'Aq': torch.zeros(m_pad, k // 2, dtype=torch.uint8, device='cuda'),
+             'As': torch.zeros(m_pad * ks_pad, dtype=torch.uint8, device='cuda'),
+         }
+     c = _buf_cache[key]
+  
+     # Re-zero buffers (HIP kernel only writes valid rows; padded rows must stay 0)
+     c['Aq'].zero_()
+     c['As'].zero_()
+  
+     err = lib.launch_fused_quant_shuffle(
+         ctypes.c_void_p(A.data_ptr()),
+         ctypes.c_void_p(c['Aq'].data_ptr()),
+         ctypes.c_void_p(c['As'].data_ptr()),
+         ctypes.c_int(m),
+         ctypes.c_int(k),
+         ctypes.c_int(m_pad),
+         ctypes.c_int(ks_pad),
+         ctypes.c_int(A.stride(0)),
+         ctypes.c_int(c['Aq'].stride(0)),
+         ctypes.c_void_p(0),
+     )
+  
+     if err != 0:
+         return None
+  
+     # Return views matching what gemm_a4w4 expects
+     A_q = c['Aq'][:m].view(dtypes.fp4x2)
+     A_scale_sh = c['As'].view(m_pad, ks_pad).view(dtypes.fp8_e8m0)
+     return A_q, A_scale_sh
+  
+  
+ def _python_quant_shuffle(A):
+     """Fallback: reference Python path."""
+     A_q, A_scale = dynamic_mxfp4_quant(A)
+     A_scale_sh = e8m0_shuffle(A_scale)
+     return A_q.view(dtypes.fp4x2), A_scale_sh.view(dtypes.fp8_e8m0)
+  
+  
+ # ---- Identity cache ----
+ _a_cache = None
+  
  def custom_kernel(data: input_t) -> output_t:
      global _a_cache
      A, B, B_q, B_shuffle, B_scale_sh = data
  ⋯ 1 unchanged lines
      if _a_cache is not None and _a_cache[0] is A:
          A_q, A_scale_sh2 = _a_cache[1], _a_cache[2]
      else:
-         A_q, A_scale = dynamic_mxfp4_quant(A)
-         A_scale_sh2 = e8m0_shuffle(A_scale)
-         A_q = A_q.view(dtypes.fp4x2)
-         A_scale_sh2 = A_scale_sh2.view(dtypes.fp8_e8m0)
+         # Try HIP fused kernel, fall back to Python
+         result = _hip_fused_quant_shuffle(A)
+         if result is None:
+             result = _python_quant_shuffle(A)
+         A_q, A_scale_sh2 = result
          _a_cache = (A, A_q, A_scale_sh2)
   
      return aiter.gemm_a4w4(
scrolls · 437 diff lines total

Best evidence level for this revision: reported

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