2 shift operations in MIPS

Question

The syntax for sll and srl is:

sll $s0,$s1,n (n is an integer, for example sll $s0,$s1,3)

srl $s0,$s1,n (n is an integer, for example srl $s0,$s1,3)

I wonder if I can substitute $n$ for a register.

For instance:

sll $s0,$s1,$s2

I'm sorry, I'm a newbie to MIPS.

http://www.mrc.uidaho.edu/mrc/people/jff/digital/MIPSir.html — , Sep 17 '18 at 15:19

Michael · Answer 1 · 2018-09-17T17:38:10.733

1

The instructions you're looking for are sllv/srlv et al. For example, sllv $s0,$s1,$s2

And as always when having questions regarding the MIPS instruction set, consult MIPS32™ Architecture For Programmers Volume II: The MIPS32™ Instruction Set.

edited Sep 17 '18 at 17:38

answered Sep 17 '18 at 15:03

Michael

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Does it mean that there's no way for the register to replace the integer? – Tjh Thon Sep 17 '18 at 16:19
I think you misread my answer. _"The instructions you're looking for are sllv/srlv et al."_ So yes, you can shift by a register-specified amount. – Michael Sep 17 '18 at 16:21
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To clarify: `sllv`, `srlv` are different instructions than `sll`, `srl`. – markgz Sep 17 '18 at 17:11

2 shift operations in MIPS

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