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Quoting - hurricanezhb

PSUBB xmm1, xmm2

PABSB xmm1, xmm2

- si the easyest way...

look at:

Intel 64 and IA-32 Architectures

Software Developers Manual

Volume 2B:

Instruction Set Reference, N-Z

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Quoting - hurricanezhb

Probably, both unsigned char and unsigned int instructions are not supported till date.

The Intel Reference document - Intel-64 & IA-32 Architectures Software Develope's Manual, Vol.2B 4-91, Order# 253667-025US only speaks about signed bytes/words/double intergers.

~BR

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Probably, both unsigned char and unsigned int instructions are not supported till date.

The Intel Reference document - Intel-64 & IA-32 Architectures Software Develope's Manual, Vol.2B 4-91, Order# 253667-025US only speaks about signed bytes/words/double intergers.

The Intel Reference document - Intel-64 & IA-32 Architectures Software Develope's Manual, Vol.2B 4-91, Order# 253667-025US only speaks about signed bytes/words/double intergers.

That probavly because data type char in C languages is the same as byte, I think. Both are 8 bits long and it doesn't mather whether it is signed or unsigned because in 2 complement logics it is the same...

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Quoting - hurricanezhb

Other sources say that abs value of the difference can be obtained by (a saturatedminus b) OR (b saturatedminus a). You can translate that into three vector operations using psubsb (subtraction using saturated arithmetic) and por.

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The question is, what do you want to do, if the result overflow...

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psubb(pmaxub(a,b), pminub(a,b))

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