visual-studio - masm 指令选项序言 :none has no effect

Question

我正在学习如何使用 MS 的官方文档来使用 masm，但是 option 指令(https://learn.microsoft.com/en-us/cpp/assembler/masm/option-masm?view=msvc-170)几乎没有任何内容。它被用在 memcpy 的标准库实现中，它似乎可以正常工作

我的代码:

title entry - general purpose testing ground for asm operations
include ksamd64.inc
        subttl  "entry"

    NESTED_ENTRY entry, _TEXT
    option PROLOGUE:NONE, EPILOGUE:NONE
;       error here: "A2220 Missing .ENDPROLOGUE"
        cvtpi2ps xmm0, qword ptr[rcx]
        rsqrtps xmm1, xmm0
        movaps xmmword ptr[rcx], xmm1
    
        cvtpi2ps xmm0, qword ptr[rcx+8]
        rsqrtps xmm1, xmm0
        movups xmmword ptr[rcx+8], xmm1
    .beginepilog
        ret
    NESTED_END entry, _TEXT
end

Answer 1

确实文档不足，但您的代码是否没有混合版本/环境？。我从网络的不同角落挖掘了以下信息。

关于.ENDPROLOG

Signals the end of the prologue declarations.It is an error to use any of the prologue declarations outside of the region between PROC FRAME and .ENDPROLOG.

---

关于NESTED_ENTRY

A NESTED_ENTRY must have an associated PROLOG_END (SH-4) and ENTRY_END (SH-4).

关于PROLOG_END

This macro must appear following a NESTED_ENTRY (SH-4) or LEAF_ENTRY (SH-4) macro.
It appears after the prolog area and before the matching ENTRY_END (SH-4) macro.

关于ENTRY_END

This macro ends the current routine specified by NESTED_ENTRY (SH-4) or LEAF_ENTRY (SH-4).
Syntax ENTRY_END[Name]
Name should be the same name used in the NESTED_ENTRY or LEAF_ENTRY macros.
The ENTRY_END (SH-4) macro currently ignores Name.

---

您没有使用 PROLOG_END，而是编写了 NESTED_END 而不是 ENTRY_END。

为什么要使用短语option PROLOGUE:NONE, EPILOGUE:NONE？也许只是将其删除...