x86: proresdsp: improve SIGNEXTEND macro comments
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@ -405,12 +405,12 @@ cglobal prores_idct_put_10, 4, 4, %1
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RET
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%endmacro
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%macro SIGNEXTEND 2-3 ; dstlow, dsthigh, tmp
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%if cpuflag(sse4)
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%macro SIGNEXTEND 2-3
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%if cpuflag(sse4) ; dstlow, dsthigh
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movhlps %2, %1
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pmovsxwd %1, %1
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pmovsxwd %2, %2
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%else ; sse2
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%elif cpuflag(sse2) ; dstlow, dsthigh, tmp
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pxor %3, %3
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pcmpgtw %3, %1
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mova %2, %1
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