Print Page - Dynamic LOCAL alignment for XMM registers.

Title: Dynamic LOCAL alignment for XMM registers.
Post by: hutch-- on September 15, 2018, 01:42:10 PM

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

Title: Re: Dynamic LOCAL alignment for XMM registers.
Post by: jj2007 on September 15, 2018, 06:10:33 PM

Code Select

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

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General => The Laboratory => Topic started by: hutch-- on September 15, 2018, 01:42:10 PM