feat(vpto): support FP8 local contiguous memory lowering

[KurrinQu]

• Support lowering f8E4M3FN and f8E5M2 scalar/vector types to native HiVM LLVM FP8 types.
• Convert the element-type properties carried by llvm.alloca and llvm.getelementptr.

[mouliangyu]

Review note (non-blocking for the intended local-memory path):

I validated the LLVM IR produced by this PR for FP8 alloca / GEP / load / store, with FP8 values produced by pto.convert, using CANN 9.0.0 Bisheng:

bisheng --target=hiipu64-hisilicon-cce \
  -march=dav-c310-vec \
  --cce-aicore-arch=dav-c310-vec \
  --cce-aicore-only -O2 -c -x ir <input.ll> -o <output.o>

That path compiles successfully.

One boundary should probably be made explicit: directly constructed FP8 constants such as

arith.constant dense<0.0> : vector<4xf8E5M2>

should be treated as unsupported, rather than lowered through the generic typed-carrier pattern. The generic pattern converts the result type while retaining the original typed value attribute. Attempts to lower the constant through an integer-vector bitcast can produce LLVM IR accepted by llvm-as, but CANN 9.0.0 Bisheng crashes in ConstantFoldCastInstruction (including zero constants).

I suggest adding an early diagnostic/verifier rejection plus a negative test for direct FP8 constants. This does not affect the supported pto.convert -> FP8 local memory path covered by this PR.

[mouliangyu]

LGTM

[reedhecre]

A3 板测失败

• 触发方式：merged
• 源码提交：1309ee9ffca5
• 结果汇总：OK 218 / FAIL 2 / SKIP 3
• 日志：/home/zhongxuan/ptoas-board-monitor/runtime/logs/20260804_072612_merged_pr1116.log
• 失败阶段：board-validation / exit=1

失败用例

• comm_p2p_binding_variants (run, exit=1)
• comm_p2p (run, exit=1)

[reedhecre]

A3 板测失败详情：PR #1116

comm_p2p_binding_variants

stage=run info=exit=1

[ERROR] aclrtSynchronizeStream(stream) failed: 507035 (/home/zhongxuan/ptoas-board-monitor/runtime/runs/20260804_072612_merged_pr1116/npu_validation/CommSync/comm_p2p_binding_variants/main.cpp:122)
[ERROR] RecentErrMsg: EZ9999: Inner Error!
EZ9999[PID: 2940000] 2026-08-04-08:15:17.529.796 (EZ9999):  The error from device(chipId:0, dieId:1), serial number is 2596, there is an exception of aivec error, core id is 19, error code = 0x10, dump info: pc start: 0x124200000000, current: 0x124200000164, vec error info: 0x4000000b7, mte error info: 0x7503000008, ifu error info: 0x212c0d6200800, ccu error info: 0x40e028000000004f, cube error info: 0, biu error info: 0, aic error mask: 0x6500020bd00028c, para base: 0x12c100000000.[FUNC:PrintCoreInfo][FILE:device_error_core_proc.cc][LINE:645]
        TraceBack (most recent call last):
       The extend info: errcode:(0x10, 0, 0) errorStr: Illegal instruction, which is usually caused by unaligned UUB addresses. fixp_error0 info: 0x3000008, fixp_error1 info: 0x75, fsmId:1, tslot:6, thread:0, ctxid:0, blk:0, sublk:0, subErrType:4.[FUNC:PrintCoreInfo][FILE:device_error_core_proc.cc][LINE:658]
       Kernel task happen error, retCode=0x31, [vector core exception].[FUNC:PreCheckTaskErr][FILE:davinci_kernel_task.cc][LINE:1729]
       AIV Kernel happen error, retCode=0x31.[FUNC:GetError][FILE:stream.cc][LINE:1475]
       [AIC_INFO] after execute:args print end[FUNC:GetError][FILE:stream.cc][LINE:1475]
       [DFX_INFO]Aicore kernel execute failed, device_id=1, stream_id=46, report_stream_id=46, task_id=0, flip_num=0, fault kernel_name=comm_p2p_binding_variants_kernel, fault kernel info ext=comm_p2p_binding_variants_kernel, program id=0, hash=3889294368825709812.[FUNC:GetError][FILE:stream.cc][LINE:1475]
       rtStreamSynchronize execution failed, reason=vector core exception[FUNC:FuncErrorReason][FILE:error_message_manage.cc][LINE:65]
       synchronize stream failed, runtime result = 507035[FUNC:ReportCallError][FILE:log_inner.cpp][LINE:148]
[2026-08-04 08:15:19] ERROR: testcase failed (exit 1): comm_p2p_binding_variants

comm_p2p

stage=run info=exit=1

[ERROR] aclrtSynchronizeStream(stream) failed: 507035 (/home/zhongxuan/ptoas-board-monitor/runtime/runs/20260804_072612_merged_pr1116/npu_validation/CommSync/comm_p2p/main.cpp:122)
[ERROR] RecentErrMsg: EZ9999: Inner Error!
EZ9999[PID: 2952523] 2026-08-04-08:15:36.825.096 (EZ9999):  The error from device(chipId:0, dieId:1), serial number is 2597, there is an exception of aivec error, core id is 24, error code = 0x10, dump info: pc start: 0x124200000000, current: 0x124200000168, vec error info: 0x4000000b7, mte error info: 0x7503000008, ifu error info: 0x212c0d6200800, ccu error info: 0x40e028000000004f, cube error info: 0, biu error info: 0, aic error mask: 0x6500020bd00028c, para base: 0x12c100000000.[FUNC:PrintCoreInfo][FILE:device_error_core_proc.cc][LINE:645]
        TraceBack (most recent call last):
       The extend info: errcode:(0x10, 0, 0) errorStr: Illegal instruction, which is usually caused by unaligned UUB addresses. fixp_error0 info: 0x3000008, fixp_error1 info: 0x75, fsmId:0, tslot:6, thread:0, ctxid:0, blk:0, sublk:0, subErrType:4.[FUNC:PrintCoreInfo][FILE:device_error_core_proc.cc][LINE:658]
       Kernel task happen error, retCode=0x31, [vector core exception].[FUNC:PreCheckTaskErr][FILE:davinci_kernel_task.cc][LINE:1729]
       AIV Kernel happen error, retCode=0x31.[FUNC:GetError][FILE:stream.cc][LINE:1475]
       [AIC_INFO] after execute:args print end[FUNC:GetError][FILE:stream.cc][LINE:1475]
       [DFX_INFO]Aicore kernel execute failed, device_id=1, stream_id=46, report_stream_id=46, task_id=0, flip_num=0, fault kernel_name=comm_p2p_kernel, fault kernel info ext=comm_p2p_kernel, program id=0, hash=15664819858989799263.[FUNC:GetError][FILE:stream.cc][LINE:1475]
       rtStreamSynchronize execution failed, reason=vector core exception[FUNC:FuncErrorReason][FILE:error_message_manage.cc][LINE:65]
       synchronize stream failed, runtime result = 507035[FUNC:ReportCallError][FILE:log_inner.cpp][LINE:148]
[2026-08-04 08:15:38] ERROR: testcase failed (exit 1): comm_p2p

[reedhecre]

A5 板测成功

• 触发方式：merged
• 源码提交：1309ee9ffca5
• 结果汇总：OK 21 / FAIL 0 / SKIP 0
• 日志：/root/ptoas-board-monitor-a5/logs/20260805_043507_merged_pr1116.log
• 结果 TSV：/root/ptoas-board-monitor-a5/logs/20260805_043507_merged_pr1116.tsv