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Editorial Team
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Editorial Team
Asked: May 27, 20262026-05-27T17:13:29+00:00 2026-05-27T17:13:29+00:00

When I disassembled my C code, I saw the following. What does this code

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When I disassembled my C code, I saw the following. What does this code do exactly? Does it have something to do with floating points?

movsd  (%rdx,%rax,8),%xmm0
mulsd  %xmm0,%xmm0
movsd  %xmm0,0x30(%rsp)
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  1. Editorial Team
    Editorial Team
    2026-05-27T17:13:30+00:00Added an answer on May 27, 2026 at 5:13 pm

    it squares a number:

    xmm0=*(rdx*8+rax); 
    xmm0*=xmm0; 
    rsp[0x30]=xmmm0;
    

    xmm0 is a floating point register.

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