Dynamic LOCAL alignment for XMM registers.

[hutch--]

Seems to work OK and easy enough to set up.

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    include \masm32\include64\masm64rt.inc

    ssealign MACRO buffer
      lea rax, buffer
      memalign rax, 16
      EXITM <rax>
    ENDM

    .code

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entry_point proc

    call testit

    conout lf,"  If you can see me, it worked.",lf,lf

    waitkey
    .exit

entry_point endp

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testit proc

    LOCAL pmem  :QWORD
    LOCAL buff[256]:BYTE

    mov pmem, ssealign(buff)

    mov r10, pmem                           ; load aligned address into register

    movdqa XMMWORD PTR [r10], xmm12
    movdqa XMMWORD PTR [r10+16], xmm13
    movdqa XMMWORD PTR [r10+32], xmm14
    movdqa XMMWORD PTR [r10+48], xmm15

    nop
    nop                                     ; your code goes here
    nop

    movntdqa xmm12, XMMWORD PTR [r10]
    movntdqa xmm13, XMMWORD PTR [r10+16]
    movntdqa xmm14, XMMWORD PTR [r10+32]
    movntdqa xmm15, XMMWORD PTR [r10+48]

    ret

testit endp

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    end

[jj2007]

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  nop                                     ; your code goes here
push+pop not allowed here...