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fix(ck-tile): correct compv3 intrawave 8-warp schedule on gfx1250 (wave32) - #11175

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users/muozturk/ck/compv3-intrawave-8warp-gfx1250-fix
Aug 27, 2026
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illsilin merged 7 commits into
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users/muozturk/ck/compv3-intrawave-8warp-gfx1250-fix

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@ozturkosu

@ozturkosu ozturkosu commented Aug 24, 2026 •

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Summary

Fixes the compv3 intrawave GEMM pipeline producing numerically wrong results on gfx1250 (MI400, RDNA4 / WMMA / wave32) for 8-warp block arrangements (2x4x1 / 4x2x1). max relative error 0.14–0.87 vs an fp32 CPU reference (not tolerance). Fixes #11161.

Root cause

The NumWarps == 8 special-cased hot-loop/tail schedule in BaseGemmPipelineAgBgCrCompV3 (BlockHasHotloop / GetBlockLoopTailNum / TailHandler) was written for wave64 512-thread blocks (gfx9xx / MFMA).

On gfx1250 an 8-warp block is wave32 = 256 threads — the same thread count as a 4-warp wave64 block — so it must follow the standard (≤4-warp) schedule.

The wave64 8-warp path mis-selects the loop tail (TailNumber::Even for even loop counts), which makes the intrawave RUN path execute one extra block_gemm on a non-existent K-tile → garbage accumulation. (For num_loop == 3 the 8-warp BlockHasHotloop uses > 3 instead of > 2, skipping the hot loop entirely.)

Fix

Add an arch-guarded compile-time predicate and switch the three checks on it:

#if defined(__gfx1250__) || defined(__GFX12__)
    static constexpr bool Use8WarpSchedule = false;
#else
    static constexpr bool Use8WarpSchedule = (Problem::BlockGemmShape::NumWarps == 8);
#endif
  • On gfx942 / gfx950 (wave64): Use8WarpSchedule == (NumWarps == 8) — byte-for-byte identical, zero regression.
  • On gfx1250 / GFX12 (wave32): the 8-warp special case is disabled, so those blocks use the standard schedule.

All users of these functions are CK_TILE_DEVICE and TailHandler::scenarios[] compiles in the same device pass, so the __gfx1250__/__GFX12__ guard is host/device consistent (verified hipcc --offload-arch=gfx1250 predefines both __gfx1250__ and __GFX12__).

Validation (on-device, gfx1250 MI400, GPU output vs fp32 CPU reference)

config before after
compv3+intrawave 2x4x1 (8-warp) MISMATCH 0.326 VERIFY rel=5.08e-04
compv3+intrawave 4x2x1 (8-warp) wrong VERIFY rel=5.08e-04
compv3+intrawave 1x8x1 / 8x1x1 (8-warp) wrong VERIFY rel=5.08e-04
compv3+intrawave 2x2x1 / 1x4x1 / 4x1x1 (4-warp control) correct VERIFY (no regression)

Validated across num_loop = 3, 4, 5, 10, 11, 12 (odd + even, hot-loop and no-hot-loop) and both fp16 (~5e-4) and bf16 (~3.8e-3, normal tolerance).

Notes

This is the real fix for #11161. An interim gate that simply drops these kernels from the gfx1250 sweep was applied to the gfx1250 enablement PRs (#10921 / #11048 / #10928); once this lands, that gate can be removed so the (now-correct) 8-warp compv3 + intrawave kernels re-enter the sweep.

Related

JIRA ID : AICK-2097

…ve32)

The compv3 intrawave GEMM pipeline produced wrong results on gfx1250 (MI400,
WMMA/wave32) for 8-warp block arrangements (2x4x1 / 4x2x1) -- max_rel 0.14-0.87
vs an fp32 CPU reference.

Root cause: the NumWarps==8 special-cased hot-loop/tail schedule in
BaseGemmPipelineAgBgCrCompV3 (BlockHasHotloop / GetBlockLoopTailNum /
TailHandler) was written for wave64 512-thread blocks (gfx9xx / MFMA). On
gfx1250 an 8-warp block is wave32 = 256 threads -- the same thread count as a
4-warp wave64 block -- so it must follow the standard (<=4-warp) schedule. The
wave64 8-warp path mis-selects the loop tail (TailNumber::Even for even loop
counts), making the intrawave RUN path execute one extra block_gemm on a
non-existent K-tile -> garbage accumulation.

Fix: add an arch-guarded compile-time predicate Use8WarpSchedule (false on
__gfx1250__/__GFX12__, unchanged NumWarps==8 on wave64) and switch the three
checks on it. Byte-identical on gfx942/gfx950 (wave64) -- zero regression; on
gfx1250/GFX12 the 8-warp blocks use the standard schedule.

Fixes #11161.
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🎉 All checks passed! This PR is ready for review.

@ozturkosu ozturkosu self-assigned this Aug 24, 2026
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@ozturkosu

ozturkosu commented Aug 24, 2026 •

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Full-sweep on-device validation (gfx1250, MI400)

Re-ran the complete default_config sweep with this fix, interim gate off so the previously-failing compv3 + intrawave + 8-warp kernels are actually generated and tested. GPU output vs an fp32 CPU reference, 3 tile-divisible shapes (768³ / 1536³ / 3072³), (ROCm 10.1):

op total (1,824 kernels × 3) the compv3+intrawave+8-warp class (was 552 wrong)
gemm_multi_abd 5,472 / 5,472 pass, 0 fail 552 / 552 correct
gemm_universal 5,472 / 5,472 pass, 0 fail 552 / 552 correct

Before this fix those 552 kernels were wrong (max_rel 0.14–0.87); now they all verify (~5e-4), and the full sweep has zero failures. No regression on ≤4-warp compv3 or on compv4 / mem / interwave.

The gfx11 stage failed with 'no ROCm-capable device is detected' /
'invalid device ordinal' after the first streamk test -- the amdgpu driver
dropped off the CI node partway through ctest, so every remaining GPU test
aborted. This is infrastructure, not a code change: test_ck_tile_gemm_pipeline_compv3_wmma
(the direct test of the touched file) passed, and on gfx11 the __gfx1250__/__GFX12__
guard added here never fires, so the emitted code is byte-identical to develop.
Empty commit to re-run CI on a healthy node.
@ozturkosu

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I dug into the red CI here — the failure is infrastructure, not this change — and I re-validated the fix end-to-end on MI400.

CI: the gfx11 failure is a node GPU-drop, not this PR

The Build CK and run Tests on gfx11 stage died because the runner lost its GPU partway through ctest:

_amdgpu_device_initialize: amdgpu_query_gpu_info_init failed
HIP runtime error: no ROCm-capable device is detected   /   invalid device ordinal

The first streamk test ran ~10 s, hit invalid device ordinal, and then every remaining GPU test failed instantly (0–1 ms) with "no ROCm-capable device is detected" — the amdgpu driver fell off the runner mid-run. Three things confirm it isn't this change:

  • test_ck_tile_gemm_pipeline_compv3_wmma — the direct test of the file I touched — passed before the GPU vanished.
  • On gfx11 the __gfx1250__ / __GFX12__ guard I added never fires, so the emitted code is byte-identical to develop there.
  • The sibling gfx1250-enablement PRs (which don't touch this file) are green on gfx11.

I re-triggered CI (empty commit e573f68); the GitHub-Actions checks are re-running green and Math CI is re-queued.

On-device re-validation on MI400 (gfx1250, Helios, ROCm 10.1)

GPU output verified against an fp32 CPU reference. I ran with the interim gate off so the previously-broken compv3 + intrawave + 8-warp kernels are actually emitted and tested.

Before/after on the exact failing class (same kernel, same shapes):

kernel with this fix fix reverted (old wave64 8-warp path)
compv3_intrawave_128x128x64_2x4x1_16x16x32 VERIFY, rel ~5e-4 MISMATCH rel 0.33–0.86
compv3_intrawave_128x128x64_4x2x1_16x16x32 VERIFY, rel ~5e-4 MISMATCH rel 0.33–0.86

The mismatches land exactly on the even-tail loop counts — matching the root cause (the wave64 8-warp path mis-selects TailNumber and runs an extra block_gemm on a non-existent K-tile).

Full default_config sweep, 3 tile-divisible shapes (768³ / 1536³ / 3072³), gate off:

op measurements pass fail previously-wrong 8-warp class
gemm_universal 5,472 5,472 0 1,824 / 1,824 now correct
gemm_multi_abd 5,472 5,472 0 1,824 / 1,824 now correct

max_rel median ~4–5e-4 (bit-accurate), zero failures. The 8-warp kernels that returned garbage on develop (#11161) all verify now, and there's no regression on ≤4-warp compv3 or on compv4 / mem / interwave.

@ozturkosu

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Full default_config sweep on MI400 (gfx1250) — clean

To make sure this fix holds across the whole config space (not just the handful of shapes in the repro), I ran the complete default_config sweep on-device on Helios (gfx1250, wave32, ROCm 10.1). Each kernel is compiled as a runtime .so for gfx1250, launched on the GPU, and its output verified against an fp32 NumPy CPU reference. I ran with the interim gate off, so the compv3 + intrawave + 8-warp kernels that were wrong on develop (#11161) are actually generated and checked.

  • 3 tile-divisible shapes per kernel: 768³ / 1536³ / 3072³ (divisible by every tile size, so pad=false kernels never hit the non-divisibility path).
op measurements pass fail previously-broken 8-warp class
gemm_universal 5,472 5,472 0 1,824 / 1,824 now correct
gemm_multi_abd 5,472 5,472 0 1,824 / 1,824 now correct

max_rel: universal median 5.08e-4 (max 5.11e-4), multi-ABD median 4.03e-4 (max 4.67e-4) — bit-accurate for fp16.

Every 2x4x1 / 4x2x1 (8-warp) kernel that returned garbage on develop now verifies, and there's no regression anywhere else (≤4-warp compv3, compv4, mem, interwave all stay clean). Zero failures across 10,944 measurements.

@ozturkosu
ozturkosu marked this pull request as ready for review August 24, 2026 08:33
@ozturkosu
ozturkosu requested a review from a team as a code owner August 24, 2026 08:33
@ozturkosu
ozturkosu requested a review from jefyang1 August 24, 2026 16:25
ozturkosu added a commit that referenced this pull request Aug 25, 2026
…n gfx1250 (#11161)"

This reverts commit 837dca8. The compv3+intrawave 8-warp (2x4x1 / 4x2x1)
kernels are re-enabled on gfx1250 so the #11161 wrong-results
defect is reproducible in this PR. Real pipeline fix is tracked in #11175.
@ozturkosu
ozturkosu requested review from DDEle and kensclin August 25, 2026 15:48
@ozturkosu

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Independent on-hardware verification (gfx1250 MI400, native example)

Verified this fix on a real gfx1250 box (heliosr-1b114-a07-1, ROCm 10.1 / clang23) via the plain ck_tile example tile_example_gemm_universal — no Dispatcher / Tile-Engine harness, just the base GEMM binary against an fp32 CPU reference. Fresh ROCm/composable_kernel clone; only include/ck_tile/ops/gemm/pipeline/gemm_pipeline_ag_bg_cr_comp_v3.hpp patched with this PR's change; identical binary rebuilt and rerun.

The gfx1250 default config GemmConfigComputeV3_WMMA is compv3 + intrawave + 4x2x1 (8 warps, 256 threads), so it exercises exactly the fixed path.

Before the patch (768³, fp16, rcr):

shape: tile_gemm_shape_128x128x32x8_4x2x1_16x16x32   blocks: {256,1,1}
max err: 63.5, 89.11183% wrong values
The CPU verification result is: fail

After the patch (same kernel, same shape, only the header changed):

shape: tile_gemm_shape_128x128x32x8_4x2x1_16x16x32   blocks: {256,1,1}
The CPU verification result is: correct

The 4-warp 2x2x1 control passes both before and after (no regression on the standard path). The arch-guarded Use8WarpSchedule predicate does exactly what the summary claims: on gfx1250 the wave64 8-warp schedule is disabled and the 8-warp block correctly follows the standard ≤4-warp schedule.

LGTM — the fix resolves #11161 on-device.

@jefyang1

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I reproduced the issue with tile_example_gemm_universal and this PR fixed it.

@illsilin
illsilin enabled auto-merge (squash) August 26, 2026 18:59
@illsilin
illsilin merged commit c0cb6df into develop Aug 27, 2026
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@illsilin
illsilin deleted the users/muozturk/ck/compv3-intrawave-8warp-gfx1250-fix branch August 27, 2026 16:34
assistant-librarian Bot pushed a commit to ROCm/composable_kernel that referenced this pull request Aug 27, 2026
fix(ck-tile): correct compv3 intrawave 8-warp schedule on
 gfx1250 (wave32) (#11175)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

## Summary

Fixes the `compv3` intrawave GEMM pipeline producing **numerically wrong
results** on **gfx1250 (MI400, RDNA4 / WMMA / wave32)** for **8-warp
block arrangements** (`2x4x1` / `4x2x1`). max relative error 0.14–0.87
vs an fp32 CPU reference (not tolerance). Fixes #11161.

## Root cause

The `NumWarps == 8` special-cased hot-loop/tail schedule in
`BaseGemmPipelineAgBgCrCompV3` (`BlockHasHotloop` /
`GetBlockLoopTailNum` / `TailHandler`) was written for **wave64
512-thread** blocks (gfx9xx / MFMA).

On gfx1250 an 8-warp block is **wave32 = 256 threads** — the same thread
count as a 4-warp wave64 block — so it must follow the standard
(≤4-warp) schedule.

The wave64 8-warp path mis-selects the loop tail (`TailNumber::Even` for
even loop counts), which makes the intrawave RUN path execute **one
extra `block_gemm` on a non-existent K-tile** → garbage accumulation.
(For `num_loop == 3` the 8-warp `BlockHasHotloop` uses `> 3` instead of
`> 2`, skipping the hot loop entirely.)

## Fix

Add an arch-guarded compile-time predicate and switch the three checks
on it:

```cpp
#if defined(__gfx1250__) || defined(__GFX12__)
    static constexpr bool Use8WarpSchedule = false;
#else
    static constexpr bool Use8WarpSchedule = (Problem::BlockGemmShape::NumWarps == 8);
#endif
```

- On **gfx942 / gfx950** (wave64): `Use8WarpSchedule == (NumWarps == 8)`
— **byte-for-byte identical, zero regression**.
- On **gfx1250 / GFX12** (wave32): the 8-warp special case is disabled,
so those blocks use the standard schedule.

All users of these functions are `CK_TILE_DEVICE` and
`TailHandler::scenarios[]` compiles in the same device pass, so the
`__gfx1250__`/`__GFX12__` guard is host/device consistent (verified
`hipcc --offload-arch=gfx1250` predefines both `__gfx1250__` and
`__GFX12__`).

## Validation (on-device, gfx1250 MI400, GPU output vs fp32 CPU
reference)

| config | before | after |
|--------|--------|-------|
| compv3+intrawave **2x4x1** (8-warp) | MISMATCH 0.326 | **VERIFY
rel=5.08e-04** |
| compv3+intrawave **4x2x1** (8-warp) | wrong | **VERIFY rel=5.08e-04**
|
| compv3+intrawave **1x8x1 / 8x1x1** (8-warp) | wrong | **VERIFY
rel=5.08e-04** |
| compv3+intrawave **2x2x1 / 1x4x1 / 4x1x1** (4-warp control) | correct
| **VERIFY** (no regression) |

Validated across `num_loop` = 3, 4, 5, 10, 11, 12 (odd + even, hot-loop
and no-hot-loop) and both fp16 (~5e-4) and bf16 (~3.8e-3, normal
tolerance).

## Notes

This is the **real** fix for #11161. An interim gate that simply drops
these kernels from the gfx1250 sweep was applied to the gfx1250
enablement PRs (#10921 / #11048 / #10928); once this lands, that gate
can be removed so the (now-correct) 8-warp `compv3 + intrawave` kernels
re-enter the sweep.
ozturkosu added a commit that referenced this pull request Aug 27, 2026
…n gfx1250 (#11161)"

This reverts commit 837dca8. The compv3+intrawave 8-warp (2x4x1 / 4x2x1)
kernels are re-enabled on gfx1250 so the #11161 wrong-results
defect is reproducible in this PR. Real pipeline fix is tracked in #11175.
ozturkosu added a commit that referenced this pull request Sep 2, 2026
JIRA ID : AICK-2101
JIRA ID : AICK-2133

## Summary
This PR enables the **multi-ABD** (`a2_b2_d2`) GEMM TE→dispatcher bridge
(#9305) on **gfx1250 / MI400**. It was split out of #10921 so the other
three ops (`gemm_universal`, `grouped_gemm`, `gemm_multi_d`) weren't
held back.



Comparison of this PR's original file set vs `develop` (branch head
`56e7bc3`):



**So the substantive multi-ABD gfx1250 enablement is already on
`develop`; the remaining unique delta in this PR is a single config file
(`example_problems.json`).**

## Motivation (why the enablement was needed)
gfx1250 runs **WMMA**, not MFMA: the valid fp16/bf16 warp tile is
**16x16x32**, whereas the CDNA MFMA **32x32x16** tile in
`default_ci_config.json` instantiates zero runnable kernels there.

## Supported surface (gfx1250)
The `a2_b2_d2` variant is intentionally narrow — the codegen, ctypes
lib, and runner are all **fp16-only** and **rcrr-only** (`expand_sweep`
rejects other dtypes/layouts). So **fp16 × rcrr is the complete
supported matrix**.

## Validation (on-device, MI400 / gfx1250)
Old-TE has no gfx1250 back end, so this is **correctness-only** (GPU
output vs an fp32 CPU reference), not a performance baseline.

Full `default_config` sweep of the fp16/rcrr surface, 3 tile-divisible
shapes (768³ / 1536³ / 3072³):

| op | supported matrix | kernels | result rows | fail |
|----|------------------|--------:|------------:|-----:|
| `gemm_multi_abd` | fp16 × rcrr (only) | 1,640 | 4,920 | **0** |

Every kernel in the supported surface is correct on gfx1250 (rel err ≈
4e-4).

## Note on #11161 (compv3 + intrawave + 8-warp)
The full sweep initially surfaced 552 failures, all in the `compv3 +
intrawave + 8-warp (2x4x1 / 4x2x1)` class — the **#11161** defect (a
wave64 assumption in the `comp_v3` pipeline, wrong on gfx1250 wave32).
An interim gate excludes that class so the supported surface reports
clean; the real fix, **#11175** (`Use8WarpSchedule`), is already on
`develop`.

## Notes / dependencies
- Built on #10921's shared gfx1250 foundation (now on `develop` via the
sibling series).
- Supersedes the earlier closed attempt **#10917**.
- Sibling gfx1250 bridge PRs: #10921 (universal / grouped / multi-D),
#10927 (grouped quant), #10928 (batched GEMM + contraction), #11043
(rowcol / tensor quant), #10934 (contraction multi-ABD).

---------

Co-authored-by: Muhammed Emin Ozturk <3836908+ozturkosu@users.noreply.github.com>
ozturkosu added a commit that referenced this pull request Sep 10, 2026
Narrowing WARP_SUPPORTED_COMBINATIONS["gfx1250"] from nine warp maps to four was
a regression. That table is shared by seven instance builders, and one of the
maps removed, 4x2x1, is plain GEMM's default gfx1250 WMMA configuration --
issue #11161 reported it returning wrong results, PR #11175 fixed it, and the
fix was verified correct on device. Measured on the predicate:

  validate_warp_configuration(4, 2, 1, "gfx1250")
      develop        ACCEPT
      after my change REJECT     <- deleted another operator's working default

The table is now byte-identical to develop again.

The restriction itself is still needed, but only here: these two grouped quant
bridges do not emit a loadable kernel entry for >4-warp blocks on gfx1250, so
those kernels abort at launch with "cannot find symbol" -- 3,220 rows in a GPU
sweep. That is a property of this bridge's code generation, not of the hardware,
which is precisely why it does not belong in a hardware capability table. It now
lives in validate_gemm_rowcol_tensor_quant(), alongside the warp-tile rule that
was already scoped to the four quant validators.

warp_k > 1 keeps its own rule rather than riding on the warps-per-block cap:
[1,2,2] has a product of 4 and would otherwise pass.

Verified: plain GEMM's 4x2x1 default is accepted again; this operator still
rejects 4x2x1, 2x4x1, 4x4x1 and 1x2x2; 32x32x32 is still rejected; the legal
16x16x128 tile is still accepted; and across gfx90a, gfx942 and gfx950 there are
zero decision changes.
andriy-ca added a commit that referenced this pull request Oct 14, 2026
…and 8-wave compv3, and offered compv5 (#13609)

JIRA ID : AICK-2558

## Why

On gfx1250 the GEMM sweep's gates disagreed with what the pipelines
support, in both directions:

- **TDM kernels were refused problems they run.** `comp_tdm` and
`comp_tdm_v2` declare `skipCheckValidLaunchParams`, so
`UniversalGemmKernel::IsSupportedArgument` accepts every problem for
them: the Tensor Data Mover clips each box to the tensor's real extent
and moves A, B and C at width 1. The dispatcher modelled their A/B
global vector widths as per-thread load widths, and both the Python
pairing and `GeneratedTileKernelInstance::supports()` applied the
unpadded tile-divisibility rule. An unpadded TDM kernel, the only kind
codegen emits, was therefore refused for every problem whose contiguous
extents are not tile and vector multiples.
- **The padded-TDM rejection reason was wrong.** It said kPad's
right-pad transforms inflate the extents TDM clips against. TDM clips
every box to the pre-pad extent (`tdm_real_lengths`), so kPad is a no-op
for it. Padded TDM stays rejected, for the real reason: each padded
kernel would duplicate the unpadded one, which already serves every
shape.
- **compv3 8-wave kernels were hidden.** `expand_sweep` skipped compv3
intrawave kernels with 8 waves (2x4x1, 4x2x1) on gfx1250, because the
pipeline's 8-warp schedule, written for wave64, gave wrong results on
wave32 (#11161). The schedule is now keyed on `CK_TILE_USE_WMMA`, so
wave32 builds take the standard schedule (#11175), and a wave32 device
build without `CK_TILE_USE_WMMA` fails a `static_assert` instead. The
gate only hid correct kernels.
- **compv5 kernels were offered although none compiles.**
`GemmPipelineAgBgCrCompV5` sizes its C LDS view with
`BlockGemm::Traits::KPack`, but its block GEMM,
`BlockGemmARegBRegCRegV1`, defines only `KPackA` and `KPackB`.
`gfx1250_pipeline_reject_reason` judged only the gfx1250-only pipelines
and the tdm epilogue, and `gemm_utils._gfx1250_pipeline_supported`
returned early for every other pipeline before consulting it. The block
GEMM is the same on other targets, where compv5 does not compile either;
this PR rejects it only on gfx1250 and leaves other targets unchanged.

## What changes

- `dispatcher/codegen/codegen_common.py`: the tdm epilogue's A/B/C
widths are 1; new `gemm_pipeline_skips_launch_checks(pipeline)`, the
Python mirror of `skipCheckValidLaunchParams`; corrected
`TDM_PAD_REJECT_REASON`; `gfx1250_pipeline_reject_reason` rejects compv5
for gfx1250 (`GFX1250_COMPV5_REJECT_REASON`).
- `tile_engine/ops/gemm/gemm_vector_fallback.py`: `_tile_fits` skips the
tile rule for those pipelines.
-
`dispatcher/include/ck_tile/dispatcher/backends/generated_tile_backend.hpp`:
new trait `pipeline_skips_launch_checks`; `supports()` skips the tile
check for pipelines that set `skipCheckValidLaunchParams`.
- `dispatcher/python/gemm_utils.py`: the compv3 8-wave gate is removed,
and `_gfx1250_pipeline_supported` passes every pipeline through
`gfx1250_pipeline_reject_reason`, so codegen, `arch_filter` and the
sweep agree.
- `tile_engine/ops/gemm/gemm_validation_utils.py`: its copy of the
padded-TDM reason.

Every other pipeline keeps both checks, and targets other than gfx1250
are unchanged.
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compv3 intrawave GEMM pipeline returns wrong results on gfx1250 (MI400) for 8-warp blocks (2x4x1/4x2x1)

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