[Bug] PTODSL-vmi, vcadd/vcamx/vcmin/vbrc 在VL=1/2/4/8时触发 VMI-PASS-INVARIANT/VMI-LAYOUT-CONTRACT

[chenben09]

Component

PTO Dialect / ODS (include/PTO/IR)

Description

在 vcadd/vcmax/vcmin/vbrc 的 grouped layout / contiguous layout 场景下，VPTO lowering 无法正确生成目标布局。该问题不是数值误差，而是 layout/lowering 阶段失败。

Reproduction (minimal)

@jit_kernel(name, params)

def kernel(in_ptr: pto.ptr(dtype, "gm"), out_ptr: pto.ptr(dtype, "gm")):

    vl = 8

    group = 1

    nbytes = dtypes.size(params["dtype"])

    in_nbytes = int(params["input_elems"]) * dtypes.size(params["dtype"])



    in_ub = pto.castptr(pto.i64(0), pto.ptr(dtype, "ub"))

    out_ub = pto.castptr(pto.i64(in_nbytes), pto.ptr(dtype, "ub"))

    pto.mte_gm_ub(in_ptr, in_ub, 0, in_nbytes, nburst=(1, 0, 0))

    pto.set_flag("MTE2", "V", event_id=0)

    pto.wait_flag("MTE2", "V", event_id=0)



    source = pto.vmi.vload(in_ub, pto.const(0, dtype=pto.index), size=vl)

    mask = pto.vmi.create_mask(vl, size=vl)

    reduced = pto.vmi.vcadd(source, mask, group=group, reassoc=True, pmode=None)

    out_vec = pto.vmi.vbrc(reduced, size=vl)

    pto.vmi.vstore(out_vec, out_ub, pto.const(0, dtype=pto.index))

    pto.set_flag("V", "MTE3", event_id=0)

    pto.wait_flag("V", "MTE3", event_id=0)

    pto.mte_ub_gm(out_ub, out_ptr, nbytes * vl, nburst=(1, 0, 0))

Expected behavior

编译通过，运行通过，若不支持则给出约束

Actual behavior / error logs

1、run 阶段失败，报 `VMI-LAYOUT-CONTRACT`，无法 materialize grouped layout
涉及用例：
  - vcadd/i8_vl8_empty
  - vcadd/i8_vl8_tail
  - vcadd/i8_vl8_all_active
  - vbrc/i8_vl8_group4_grouped_tail
  - vbrc/i8_vl4_group4_grouped_tail

报错日志：


[FAIL] i8_vl64_group4_grouped_tail backend=run | RuntimeError: command failed (1): /home/luyijing/llvm-workspace/.venv/bin/ptoas --pto-arch=a5 --pto-level=level3 --enable-tile-op-expand

/home/luyijing/workspace-pto/pto_test/build/pto-test/20260825-vmi-all-interfaces-ac/sim/msprof-private/vbrc_launch.gAfSwu/ptodsl-cache/kernel_5c9a4b7ba23fd456/kernel.mlir -o /home/luyijing/workspace-pto/pto_test/build/pto-test/20260825-vmi-all-interfaces-ac/sim/msprof-private/vbrc_launch.gAfSwu/ptodsl-cache/kernel_5c9a4b7ba23fd456/kernel.o

[LOG_WARNING] can not open file, file: /home/luyijing/ascend/log/run/plog/plog-48018_20260827103858691.log, possible reason: Read-only file system.Warning: PTO_ISA_PATH/PTO_ISA_ROOT is not set; C++ device object emission may fail to include pto/pto-inst.hpp.

loc("/home/luyijing/workspace-pto/pto_test/build/pto-test/20260825-vmi-all-interfaces-ac/sim/msprof-private/vbrc_launch.gAfSwu/ptodsl-cache/kernel_5c9a4b7ba23fd456/kernel.mlir":20:7): error: VMI-LAYOUT-CONTRACT: cannot materialize requested VMI operand layout #pto.vmi.layout<contiguous, lane_stride = 4>

Error: VPTO emission pipeline failed.

Git commit

10883a8

Host platform

Linux (aarch64)

Target Ascend arch (if relevant)

a5

PTOAS build level (if relevant)

None