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The latest version of this topic can be found at .SAVEXMM128.

Generates either a UWOP_SAVE_XMM128 or a UWOP_SAVE_XMM128_FAR unwind code entry for the specified XMM register and offset using the current prologue offset. MASM will choose the most efficient encoding.

.savexmm128 xmmreg , offset  

.SAVEXMM128 allows ml64.exe users to specify how a frame function unwinds, and is only allowed within the prologue, which extends from the PROC FRAME declaration to the .ENDPROLOG directive. These directives do not generate code; they only generate .xdata and .pdata. .SAVEXMM128 should be preceded by instructions that actually implement the actions to be unwound. It is a good practice to wrap both the unwind directives and the code they are meant to unwind in a macro to ensure agreement.

offset must be a multiple of 16.

For more information, see MASM for x64 (ml64.exe).

Directives Reference