Doubt about the Intel's IA-32 software developer manual

Posted by Francesco Turco on Stack Overflow See other posts from Stack Overflow or by Francesco Turco
Published on 2010-04-19T06:42:32Z Indexed on 2010/04/19 6:53 UTC
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intel

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x86

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ia-32

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assembly

I'm studying the Intel's IA-32 software developer manual. In particular, I'm reading the following manual: http://www.intel.com/Assets/PDF/manual/253666.pdf. Let's take for example the ADD instruction. On page 79 it is written that you can an r8 (8-bit register) to an r/m8 (8-bit register or memory location). A few rows below, it is also written that you can add an r/m8 to an r8. The question is: if I add two 8-bit registers, which instruction I am using? Thanks.

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