Assembly x64 Intro - SSE2 Copy8Times
2015-12-16 09:31
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;copy a dw into a xmm for 8 times
%macro SSE2_Copy8Times 2
movd %1, %2
punpcklwd %1, %1
pshufd %1, %1, 0
%endmacro
SSE2_Copy8Times xmm1, r2d ; xmm1 = b,b,b,b,b,b,b,b
假设 r2d = 0x0000003f
上述将展开如下：
movd xmm1, r2d => xmm1 = 0x00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3f
punpcklwd xmm1, xmm1 => xmm1 = 0x00 00 00 00 00 00 00 00 00 00 00 00 00 3f 00 3f
pshufd xmm1, xmm1, 0 => xmm1 = 0x00 3f 00 3f 00 3f 00 3f 00 3f 00 3f 00 3f 00 3f
%macro SSE2_Copy8Times 2
movd %1, %2
punpcklwd %1, %1
pshufd %1, %1, 0
%endmacro
SSE2_Copy8Times xmm1, r2d ; xmm1 = b,b,b,b,b,b,b,b
假设 r2d = 0x0000003f
上述将展开如下：
movd xmm1, r2d => xmm1 = 0x00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3f
punpcklwd xmm1, xmm1 => xmm1 = 0x00 00 00 00 00 00 00 00 00 00 00 00 00 3f 00 3f
pshufd xmm1, xmm1, 0 => xmm1 = 0x00 3f 00 3f 00 3f 00 3f 00 3f 00 3f 00 3f 00 3f
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