ARM版Windows上でx86およびx64アプリケーションを動作させるためのPrismエミュレータですが、現状はどうなっているのか気になったのでさくっと調べてみました。
くまたん
・・・あれ？2024年11月以降はPrismに関するニュースが流れてない・・・？
そんなこと無いやろ？と思ったんですがマイクロソフトのサイト「Arm ベースの Surface デバイスに関する FAQ - Surface | Microsoft Learn」は2025年2月の日付になっています。ただPrismに関する概要は書かれていても詳細については書かれていないですね。
2024年11月6日（現地時間）にPrismの機能強化を図ったビルド27744をCanaryチャンネルに配布開始したというニュース以降は目立ったアナウンスは無いようです。
では手持ちのCopilot+PCで現状を確認ということでCoreinfo64.exeを実行してみました。ちなみにWindows Updateは最新の状況にしてありWindows Insider Programには参加していない状況での実行です。
Snapdragon(R) X 10-core X1P64100 @ 3.40 GHz
ARMv8 (64-bit) Family 8 Model 1 Revision 201, Qualcomm Technologies Inc
HTT - Multicore
CET - Supports Control Flow Enforcement Technology
Kernel CET - Kernel-mode CET Enabled
User CET - User-mode CET Allowed
HYPERVISOR - Hypervisor is present
VMX - Supports Intel hardware-assisted virtualization
SVM - Supports AMD hardware-assisted virtualization
X64 * Supports 64-bit mode
SMX - Supports Intel trusted execution
SKINIT - Supports AMD SKINIT
SGX - Supports Intel SGX
NX * Supports no-execute page protection
SMEP - Supports Supervisor Mode Execution Prevention
SMAP - Supports Supervisor Mode Access Prevention
PAGE1GB - Supports 1 GB large pages
PAE - Supports > 32-bit physical addresses
PAT - Supports Page Attribute Table
PSE - Supports 4 MB pages
PSE36 - Supports > 32-bit address 4 MB pages
PGE - Supports global bit in page tables
SS - Supports bus snooping for cache operations
VME - Supports Virtual-8086 mode
RDWRFSGSBASE - Supports direct GS/FS base access
FPU * Implements i387 floating point instructions
MMX * Supports MMX instruction set
MMXEXT - Implements AMD MMX extensions
3DNOW - Supports 3DNow! instructions
3DNOWEXT - Supports 3DNow! extension instructions
SSE * Supports Streaming SIMD Extensions
SSE2 * Supports Streaming SIMD Extensions 2
SSE3 * Supports Streaming SIMD Extensions 3
SSSE3 * Supports Supplemental SIMD Extensions 3
SSE4a - Supports Streaming SIMDR Extensions 4a
SSE4.1 * Supports Streaming SIMD Extensions 4.1
SSE4.2 * Supports Streaming SIMD Extensions 4.2
AES * Supports AES extensions
AVX - Supports AVX instruction extensions
AVX2 - Supports AVX2 instruction extensions
AVX-512-F - Supports AVX-512 Foundation instructions
AVX-512-DQ - Supports AVX-512 double and quadword instructions
AVX-512-IFAMA - Supports AVX-512 integer Fused multiply-add instructions
AVX-512-PF - Supports AVX-512 prefetch instructions
AVX-512-ER - Supports AVX-512 exponential and reciprocal instructions
AVX-512-CD - Supports AVX-512 conflict detection instructions
AVX-512-BW - Supports AVX-512 byte and word instructions
AVX-512-VL - Supports AVX-512 vector length instructions
FMA - Supports FMA extensions using YMM state
MSR - Implements RDMSR/WRMSR instructions
MTRR - Supports Memory Type Range Registers
XSAVE - Supports XSAVE/XRSTOR instructions
OSXSAVE - Supports XSETBV/XGETBV instructions
RDRAND - Supports RDRAND instruction
RDSEED - Supports RDSEED instruction
CMOV * Supports CMOVcc instruction
CLFSH * Supports CLFLUSH instruction
CX8 * Supports compare and exchange 8-byte instructions
CX16 * Supports CMPXCHG16B instruction
BMI1 - Supports bit manipulation extensions 1
BMI2 - Supports bit manipulation extensions 2
ADX - Supports ADCX/ADOX instructions
DCA - Supports prefetch from memory-mapped device
F16C - Supports half-precision instruction
FXSR * Supports FXSAVE/FXSTOR instructions
FFXSR - Supports optimized FXSAVE/FSRSTOR instruction
MONITOR - Supports MONITOR and MWAIT instructions
MOVBE - Supports MOVBE instruction
ERMSB - Supports Enhanced REP MOVSB/STOSB
PCLMULDQ * Supports PCLMULDQ instruction
POPCNT * Supports POPCNT instruction
LZCNT - Supports LZCNT instruction
SEP - Supports fast system call instructions
LAHF-SAHF * Supports LAHF/SAHF instructions in 64-bit mode
HLE - Supports Hardware Lock Elision instructions
RTM - Supports Restricted Transactional Memory instructions
DE - Supports I/O breakpoints including CR4.DE
DTES64 - Can write history of 64-bit branch addresses
DS - Implements memory-resident debug buffer
DS-CPL - Supports Debug Store feature with CPL
PCID - Supports PCIDs and settable CR4.PCIDE
INVPCID - Supports INVPCID instruction
PDCM - Supports Performance Capabilities MSR
RDTSCP * Supports RDTSCP instruction
TSC * Supports RDTSC instruction
TSC-DEADLINE - Local APIC supports one-shot deadline timer
TSC-INVARIANT * TSC runs at constant rate
xTPR - Supports disabling task priority messages
EIST - Supports Enhanced Intel Speedstep
ACPI - Implements MSR for power management
TM - Implements thermal monitor circuitry
TM2 - Implements Thermal Monitor 2 control
APIC - Implements software-accessible local APIC
x2APIC - Supports x2APIC
CNXT-ID - L1 data cache mode adaptive or BIOS
MCE - Supports Machine Check, INT18 and CR4.MCE
MCA - Implements Machine Check Architecture
PBE - Supports use of FERR#/PBE# pin
PSN - Implements 96-bit processor serial number
PREFETCHW * Supports PREFETCHW instruction
Maximum implemented CPUID leaves: 0000000D (Basic), 80000008 (Extended).
Maximum implemented address width: 32 bits (virtual), 32 bits (physical).
Processor signature: 00600F01
Logical to Physical Processor Map:
*--------- Physical Processor 0
-*-------- Physical Processor 1
--*------- Physical Processor 2
---*------ Physical Processor 3
----*----- Physical Processor 4
-----*---- Physical Processor 5
------*--- Physical Processor 6
-------*-- Physical Processor 7
--------*- Physical Processor 8
---------* Physical Processor 9
Logical Processor to Socket Map:
********** Socket 0
Logical Processor to NUMA Node Map:
********** NUMA Node 0
No NUMA nodes.
Logical Processor to Cache Map:
*--------- Instruction Cache 0, Level 1, 192 KB, Assoc 6, LineSize 64
*--------- Data Cache 0, Level 1, 96 KB, Assoc 6, LineSize 64
****------ Unified Cache 0, Level 2, 12 MB, Assoc 12, LineSize 64
-*-------- Instruction Cache 1, Level 1, 192 KB, Assoc 6, LineSize 64
-*-------- Data Cache 1, Level 1, 96 KB, Assoc 6, LineSize 64
--*------- Instruction Cache 2, Level 1, 192 KB, Assoc 6, LineSize 64
--*------- Data Cache 2, Level 1, 96 KB, Assoc 6, LineSize 64
---*------ Instruction Cache 3, Level 1, 192 KB, Assoc 6, LineSize 64
---*------ Data Cache 3, Level 1, 96 KB, Assoc 6, LineSize 64
----*----- Instruction Cache 4, Level 1, 192 KB, Assoc 6, LineSize 64
----*----- Data Cache 4, Level 1, 96 KB, Assoc 6, LineSize 64
----***--- Unified Cache 1, Level 2, 12 MB, Assoc 12, LineSize 64
-----*---- Instruction Cache 5, Level 1, 192 KB, Assoc 6, LineSize 64
-----*---- Data Cache 5, Level 1, 96 KB, Assoc 6, LineSize 64
------*--- Instruction Cache 6, Level 1, 192 KB, Assoc 6, LineSize 64
------*--- Data Cache 6, Level 1, 96 KB, Assoc 6, LineSize 64
-------*-- Instruction Cache 7, Level 1, 192 KB, Assoc 6, LineSize 64
-------*-- Data Cache 7, Level 1, 96 KB, Assoc 6, LineSize 64
-------*** Unified Cache 2, Level 2, 12 MB, Assoc 12, LineSize 64
--------*- Instruction Cache 8, Level 1, 192 KB, Assoc 6, LineSize 64
--------*- Data Cache 8, Level 1, 96 KB, Assoc 6, LineSize 64
---------* Instruction Cache 9, Level 1, 192 KB, Assoc 6, LineSize 64
---------* Data Cache 9, Level 1, 96 KB, Assoc 6, LineSize 64
Logical Processor to Group Map:
********** Group 0
くまたん
え？拡張命令 AVX,AVX2 とか、まだ無効のままやん・・・
というわけで手持ちのPCではまだPrismの新機能は使えないことがわかりました。すぐにOSのビルド番号を調べてみると・・・「26100.6899」とな。なるほど、ビルド番号から察するにまだ一般には公開されてないよ！ということでしょう。
にしてもIntelやAMDとの競争を考えるとARM版Windows上でのx64アプリケーションの実行可能状況はもっとスピードアップして改善しないと互換性の懸念がくすぶり続けるのでは？と思ってしまいますが「アプリ側でARM版に対応したらそれでええねん！」ということでARMネイティブのアプリが増えるほうが本来望ましい形なのでエミュレータの機能向上はそれほど優先度が高くないタスクなのかもしれませんね。
くまたん
アナウンスされたのが昨年11月・・・もうすぐ1年経つやん。まだ届かないのはなんでやろね？