CODEWITHSUNDEEP
clinuxgccassembly
MetallicPriest
MetallicPriest

Reputation: 30765

What does this assembly code do?

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)

Upvotes: 1

Views: 254

Answers (1)

flownt
flownt

Reputation: 760

it squares a number: 

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

xmm0 is a floating point register.

Upvotes: 7

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