I am trying to figure out what these lines of code do
movsbq (%rbx),%rcx
and
add (%rdx,%rcx,4),%eax
What does movsbq and this add line do?
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MOVSBQ reads one byte from the source, signs extends it to a quad word (64 bits, replicating bit 7 into bits 63:8) and writes the value to the destination register.
The addressing mode (%r1,%r2,4) computes the address of the operand as R1 + R2 * 4. The ADD instruction reads the DWORD at that address and adds it to EAX.